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    |          DTC           |      Description       |    Possible Causes     |    Diagnostic Aides    |
    |________________________|________________________|________________________|________________________|
    | P0102 - Mass Air Flow  | The MAF sensor circuit | *  MAF sensor          | A MAF V PID (MAF PID)  |
    | (MAF) Circuit Low      | is monitored by the    |    disconnected        | reading less than 0.23 |
    | Input                  | PCM for low air flow   | *  MAF circuit open to | volts (Refer to        |
    |                        | (or voltage) input     |    PCM                 | equivalent grams       |
    |                        | through the            | *  VPWR open to MAF    | /second chart in       |
    |                        | comprehensive          |    sensor              | Pinpoint Test DC) in   |
    |                        | component monitor      | *  PWR GND open to MAF | continuous memory or   |
    |                        | (CCM). If during key   |    sensor              | key ON and engine      |
    |                        | ON engine running the  | *  MAF RTN circuit     | running indicates a    |
    |                        | air flow (or voltage)  |    open to PCM         | hard fault.            |
    |                        | changes below a        | *  MAF circuit shorted |                        |
    |                        | minimum calibrated     |    to GND              |                        |
    |                        | limit, the test fails. | *  Intake air leak     |                        |
    |                        |                        |    (near MAF sensor)   |                        |
    |                        |                        | *  A closed [throttle  |                        |
    |                        |                        |    indication throttle |                        |
    |                        |                        |    position (TP)       |                        |
    |                        |                        |    sensor system]      |                        |
    |                        |                        | *  Damaged MAF sensor  |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0103 - Mass Air Flow  | The MAF sensor circuit | *  MAF sensor screen   | A MAF V PID (MAF PID)  |
    | (MAF) Circuit High     | is monitored by the    |    is blocked          | reading less than 4.6  |
    | Input                  | PCM for high air flow  | *  MAF circuit shorted | volts (Refer to        |
    |                        | (or voltage) input     |    to VPWR             | equivalent grams       |
    |                        | through the            | *  Damaged MAF sensor  | /second chart in       |
    |                        | comprehensive          | *  Damaged PCM         | Pinpoint Test DC) in   |
    |                        | component monitor      |                        | continuous memory or   |
    |                        | (CCM). If during key   |                        | key ON and engine      |
    |                        | ON engine OFF or key   |                        | running indicates a    |
    |                        | ON engine running the  |                        | hard fault.            |
    |                        | air flow (or voltage)  |                        |                        |
    |                        | changes above a        |                        |                        |
    |                        | maximum calibrated     |                        |                        |
    |                        | limit, the test fails. |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0106 - Barometric     | Baro sensor input to   | *  Slow responding     | -  VREF voltage should |
    | (BARO) Pressure Sensor | the PCM is monitored   |    BARO sensor         |    be between 4.0 and  |
    | Circuit Performance    | and is not within the  | *  Electrical circuit  |    6.0 volts           |
    |                        | calibrated value.      |    failure             | -  PID reading is in   |
    |                        |                        | *  Damaged BARO sensor |    frequency           |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0107 - BARO Sensor    | Sensor operating       | *  Open in the circuit | -  VREF should be      |
    | Low Voltage Detected   | voltage is less than   |    , or short to groun |    greater than 4.0    |
    |                        | 5.0 volts (VREF), as a | *  VREF circuit open,  |    volts               |
    |                        | result it failed below |    or short to ground  | -  PID reading is in   |
    |                        | the minimum allowable  | *  Damaged BARO sensor |    frequency           |
    |                        | calibrated parameter.  | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0108 - BARO Sensor    | Sensor operating       | *  VREF shorted to     | -  VREF should be less |
    | High Voltage Detected  | voltage is greater     |    VWPR                |    than 6.0 volts.     |
    |                        | than 5.0 volts (VREF), | *  BARO signal shorted |   *  PID reading is in |
    |                        | as a result it failed  |    to VPWR             |      frequency         |
    |                        | above maximum          | *  Damaged BARO sensor |                        |
    |                        | allowable calibrated   | *  Damaged PCM         |                        |
    |                        | parameter.             |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0109 - BARO Sensor    | The sensor signal to   | *  Loose electrical    | Check harness and      |
    | Circuit Intermittent   | the PCM is failing     |    connection          | connection.            |
    |                        | intermittently.        | *  Damaged BARO sensor |                        |
    |________________________|________________________|________________________|________________________|
    | P0112 - Intake Air     | Indicates the sensor   | *  Grounded circuit in | -  Using signal        |
    | Temperature (IAT)      | signal is less than    |    harness             |    simulation,         |
    | Circuit Low Input      | Self-Test minimum. The | *  Damaged sensor      |    disconnect sensor   |
    |                        | IAT sensor minimum is  | *  Improper harness    |    and simulate 1.0V   |
    |                        | 0.2 volts or 121øC     |    connection          |    on sensor signal    |
    |                        | (250øF).               | *  Damaged PCM         |    circuit. Simulated  |
    |                        |                        |                        |    1.0V signal and     |
    |                        |                        |                        |    scan PID voltage    |
    |                        |                        |                        |    value should be     |
    |                        |                        |                        |    similar. If voltage |
    |                        |                        |                        |    is similar check    |
    |                        |                        |                        |    sensor, if voltage  |
    |                        |                        |                        |    is not similar      |
    |                        |                        |                        |    check related       |
    |                        |                        |                        |    circuit and PCM.    |
    |________________________|________________________|________________________|________________________|
    | P0113 - Intake Air     | Indicates the sensor   | *  Open circuit in     | -  Using signal        |
    | Temperature (IAT)      | signal is greater than |    harness             |    simulation,         |
    | Circuit High Input     | Self-Test maximum. The | *  Sensor signal short |    disconnect sensor   |
    |                        | IAT sensor maximum is  |    to power            |    and simulate 1.0V   |
    |                        | 4.6 volts or -50øC (   | *  Damaged sensor      |    on sensor signal    |
    |                        | -46øF).                | *  Improper harness    |    circuit. Simulated  |
    |                        |                        |    connection          |    1.0V signal and     |
    |                        |                        | *  Damaged PCM         |    scan PID voltage    |
    |                        |                        |                        |    value should be     |
    |                        |                        |                        |    similar. If voltage |
    |                        |                        |                        |    is similar check    |
    |                        |                        |                        |    sensor, if voltage  |
    |                        |                        |                        |    is not similar      |
    |                        |                        |                        |    check related       |
    |                        |                        |                        |    circuit and PCM.    |
    |________________________|________________________|________________________|________________________|
    | P0117 - Engine Coolant | Indicates the sensor   | *  Grounded circuit in | -  Using signal        |
    | Temperature (ECT)      | signal is less than    |    harness             |    simulation,         |
    | Circuit Low Input      | Self-Test minimum. The | *  Damaged sensor      |    disconnect sensor   |
    |                        | ECT sensor minimum is  | *  Improper harness    |    and simulate 1.0V   |
    |                        | 0.2 volts or 121øC     |    connection          |    on sensor signal    |
    |                        | (250øF). Note on some  | *  Damaged PCM         |    circuit. Simulated  |
    |                        | vehicles that are not  |                        |    1.0V signal and     |
    |                        | equipped with an ECT   |                        |    scan PID voltage    |
    |                        | sensor, CHT can be     |                        |    value should be     |
    |                        | used and can set this  |                        |    similar. If voltage |
    |                        | DTC.                   |                        |    is similar check    |
    |                        |                        |                        |    sensor, if voltage  |
    |                        |                        |                        |    is not similar      |
    |                        |                        |                        |    check related       |
    |                        |                        |                        |    circuit and PCM.    |
    |________________________|________________________|________________________|________________________|
    | P0118 - Engine Coolant | Indicates the sensor   | *  Open circuit in     | -  Using signal        |
    | Temperature (ECT)      | signal is greater than |    harness             |    simulation,         |
    | Circuit High Input     | Self-Test maximum. The | *  Sensor signal short |    disconnect sensor   |
    |                        | ECT sensor maximum is  |    to power            |    and simulate 1.0V   |
    |                        | 4.6 volts or -50øC (   | *  Damaged PCM         |    on sensor signal    |
    |                        | -46øF). Note on some   | *  Improper harness    |    circuit. Simulated  |
    |                        | vehicles that are not  |    connection          |    1.0V signal and     |
    |                        | equipped with an ECT   | *  Damaged sensor      |    scan PID voltage    |
    |                        | sensor, CHT can be     |                        |    value should be     |
    |                        | used and can set this  |                        |    similar. If voltage |
    |                        | DTC.                   |                        |    is similar check    |
    |                        |                        |                        |    sensor, if voltage  |
    |                        |                        |                        |    is not similar      |
    |                        |                        |                        |    check related       |
    |                        |                        |                        |    circuit and PCM.    |
    |________________________|________________________|________________________|________________________|
    | P0121 - Throttle       | The TP sensor circuit  | *  TP circuit open to  | Drive vehicle, bring   |
    | Position (TP) Circuit  | is monitored by the    |    PCM                 | to a stop, turn key    |
    | Performance Problem    | PCM for a none closed  | *  Damaged TP sensor   | OFF. Start vehicle,    |
    |                        | throttle position at   | *  SIG RTN circuit     | run key ON engine      |
    |                        | idle. If key ON engine |    open to TP sensor   | running self-test at   |
    |                        | running self-test      |                        | idle. Access KOER      |
    |                        | terminates upon        |                        | diagnostic trouble     |
    |                        | placing the            |                        | codes on scan tool.    |
    |                        | transmission range     |                        |                        |
    |                        | selector in gear       |                        |                        |
    |                        | (DRIVE or REVERSE) or  |                        |                        |
    |                        | when closing the       |                        |                        |
    |                        | throttle (idle) after  |                        |                        |
    |                        | opening it (in PARK or |                        |                        |
    |                        | NEUTRAL) the TP closed |                        |                        |
    |                        | throttle position is   |                        |                        |
    |                        | not attained, the test |                        |                        |
    |                        | fails.                 |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0122 - Throttle       | The TP sensor circuit  | *  TP sensor not       |  A TP PID (TP V PID)   |
    | Position (TP) Circuit  | is monitored by the    |    seated properly     | reading less than      |
    | Low Input              | PCM for a low TP       | *  TP circuit open to  | 3.42% (0.17 volt) in   |
    |                        | rotation angle (or     |    PCM                 | key ON engine OFF,     |
    |                        | voltage) input through | *  VREF open to TP     | continuous memory or   |
    |                        | the comprehensive      |    sensor              | key ON engine running  |
    |                        | component monitor      | *  TP circuit short to | indicates a hard       |
    |                        | (CCM). If during key   |    GND                 | fault.                 |
    |                        | ON engine OFF or key   | *  Damaged TP sensor   |                        |
    |                        | ON engine running the  | *  Damaged PCM         |                        |
    |                        | TP rotation angle (or  |                        |                        |
    |                        | voltage) changes below |                        |                        |
    |                        | a minimum calibrated   |                        |                        |
    |                        | limit, the test fails. |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0123 - Throttle       | The TP sensor circuit  | *  TP sensor not       | A TP PID (TP V PID)    |
    | Position (TP) Circuit  | is monitored by the    |    seated properly     | reading greater than   |
    | High Input             | PCM for a high TP      | *  TP circuit short to | 93% (4.65 volts) in    |
    |                        | rotation angle (or     |    PWR                 | key ON engine OFF,     |
    |                        | voltage) input through | *  VREF short to PWR   | continuous memory or   |
    |                        | the comprehensive      | *  SIG RTN circuit     | key ON engine running  |
    |                        | component monitor      |    open to TP sensor   | indicates a hard       |
    |                        | (CCM). If during key   | *  Damaged TP sensor   | fault.                 |
    |                        | ON engine OFF or key   | *  Damaged PCM         |                        |
    |                        | ON engine running the  |                        |                        |
    |                        | TP rotation angle (or  |                        |                        |
    |                        | voltage) changes above |                        |                        |
    |                        | maximum calibrated     |                        |                        |
    |                        | limit, the test fails. |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0125 - Insufficient   | Indicates the ECT      | *  Insufficient warm   | Compare ECT PID to     |
    | Coolant Temperature    | sensor has not         |    up time             | thermostat             |
    | For Closed Loop Fuel   | achieved the required  | *  Low engine coolant  | specification when     |
    | Control                | temperature level to   |    level               | vehicle is at          |
    |                        | enter closed loop      | *  Leaking or stuck    | operating temperature. |
    |                        | operating conditions   |    open thermostat     | Temperature readings   |
    |                        | within a specified     | *  Malfunctioning ECT  | should be similar.     |
    |                        | amount of time after   |    sensor              |                        |
    |                        | starting engine.       |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0131 - HO2S Sensor    | The HO2S sensor is     | *  Contaminated HO2S   |                        |
    | Circuit Out of Range   | monitored for a        |    (water, fuel, etc)  |                        |
    | Low Voltage (HO2S-11)  | negative voltage known | *  Crossed HO2S signal |                        |
    |                        | as characteristic      |    /signal return      |                        |
    |                        | shift downward (CSD).  |    wiring              |                        |
    |                        | If the sensor is       |                        |                        |
    |                        | thought to be          |                        |                        |
    |                        | switching from 0 volts |                        |                        |
    |                        | to -1 volts during     |                        |                        |
    |                        | testing, the PCM will  |                        |                        |
    |                        | use this input and     |                        |                        |
    |                        | remain in fuel         |                        |                        |
    |                        | control.               |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0133 - HO2S Sensor    | The HEGO Monitor       | *  Contaminated HO2S   | Access HO2S test       |
    | Circuit Slow Response  | checks the HO2S Sensor |    sensor.             | results from the       |
    | (HO2S-11)              | frequency and          | *  Exhaust leaks.      | Generic OBD-II menu to |
    |                        | amplitude. If during   | *  Shorted /open       | verify DTC.            |
    |                        | testing the frequency  |    wiring.             |                        |
    |                        | and amplitude were to  | *  Improper fueling.   |                        |
    |                        | fall below a           | *  MAF sensor.         |                        |
    |                        | calibrated limit, the  | *  Deteriorating HO2S  |                        |
    |                        | test will fail.        |    sensor.             |                        |
    |                        |                        | *  Inlet air leaks.    |                        |
    |________________________|________________________|________________________|________________________|
    | P0135 - HO2S Sensor    | During testing the     | *  Short to VPWR in    | -  wiring.             |
    | Circuit Malfunction    | HO2S Heaters are       |    harness or HO2S.    | -  Damaged HO2S        |
    | (HO2S-11)              | checked for opens      | *  Water in harness    |    heater.             |
    |                        | /shorts and excessive  |    connector.          | -  Damaged PCM.        |
    |                        | current draw. The test | *  Open VPWR circuit.  |                        |
    |                        | fails when current     | *  Open GND circuit.   |                        |
    |                        | draw exceeds a         | *  Low battery         |                        |
    |                        | calibrated limit and   |    voltage.            |                        |
    |                        | /or an open or short   | *  Corrosion or poor   |                        |
    |                        | is detected.           |    mating terminals    |                        |
    |                        |                        |    and wiring          |                        |
    |                        |                        | *  Damaged HO2S        |                        |
    |                        |                        |    heater.             |                        |
    |                        |                        | *  Damaged PCM.        |                        |
    |________________________|________________________|________________________|________________________|
    | P0136 - HO2S Sensor    | The downstream HO2S    | *  Pinched, shorted,   |                        |
    | Circuit Malfunction    | sensor(s) are          |    and corroded wiring |                        |
    | (HO2S-12)              | continuously checked   |    and pins.           |                        |
    |                        | for maximum and        | *  Crossed sensor      |                        |
    |                        | minimum voltages. The  |    wires.              |                        |
    |                        | test fails when the    | *  Exhaust leaks.      |                        |
    |                        | voltages fail to meet  | *  Contaminated or     |                        |
    |                        | the calibrated limits. |    damaged sensor.     |                        |
    |________________________|________________________|________________________|________________________|
    | P0141 - HO2S Sensor    | See DTC P0135          |                        |                        |
    | Circuit Malfunction    |                        |                        |                        |
    | (HO2S-125)             |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0151 - HO2S Sensor    | See DTC P0131          |                        |                        |
    | Circuit Out of Range   |                        |                        |                        |
    | Low Voltage (HO2S-21)  |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0153 - HO2S Sensor    | See DTC P0133.         |                        |                        |
    | Circuit Slow Response  |                        |                        |                        |
    | (HO2S-21)              |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0155 - HO2S Sensor    | See DTC P0135          |                        |                        |
    | Circuit Malfunction    |                        |                        |                        |
    | (HO2S-21)              |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0156 - HO2S Sensor    | See DTC P0136          |                        |                        |
    | Circuit Malfunction    |                        |                        |                        |
    | (HO2S-22)              |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0161 - HO2S Sensor    | See DTC P0135          |                        |                        |
    | Circuit Malfunction    |                        |                        |                        |
    | (HO2S-22)              |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0171 - System to Lean | The Adaptive Fuel      |                        |                        |
    | (Bank 1)               | Strategy continuously  |                        |                        |
    |                        | monitors fuel delivery |                        |                        |
    |                        | hardware. The test     |                        |                        |
    |                        | fails when the         |                        |                        |
    |                        | adaptive fuel tables   |                        |                        |
    |                        | reach a rich           |                        |                        |
    |                        | calibrated limit.      |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0172 - System to Rich | The Adaptive Fuel      | See Possible Causes    |                        |
    | (Bank 1)               | Strategy continuously  | for DTC P0171          |                        |
    |                        | monitors the fuel      |                        |                        |
    |                        | delivery hardware. The |                        |                        |
    |                        | test fails when the    |                        |                        |
    |                        | adaptive fuel tables   |                        |                        |
    |                        | reach a lean           |                        |                        |
    |                        | calibrated limit.      |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0174 - System to Lean | The Adaptive Fuel      | See Possible Causes    |                        |
    | (Bank 2)               | Strategy continuously  | for DTC P0171.         |                        |
    |                        | monitors the fuel      |                        |                        |
    |                        | delivery hardware. The |                        |                        |
    |                        | test fails when the    |                        |                        |
    |                        | adaptive fuel tables   |                        |                        |
    |                        | reach a rich           |                        |                        |
    |                        | calibrated limit.      |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0175 - System to Rich | The Adaptive Fuel      | See Possible Causes    | A SHRTFT-1,2 PID value |
    | (Bank 2)               | Strategy continuously  | for DTC P0171.         | between -25% to +35%   |
    |                        | monitors the fuel      | For lean and rich      | and a LONGFT-1,2 PID   |
    |                        | delivery hardware. The | DTCs:                  | value between -35% to  |
    |                        | test fails when the    | *  Fuel system         | +35% is acceptable.    |
    |                        | adaptive fuel tables   | *  Excessive fuel      | Reading beyond these   |
    |                        | reach a lean           |    pressure.           | values indicate a      |
    |                        | calibrated limit.      | *  Leaking             | failure.               |
    |                        |                        |    /contaminated fuel  |                        |
    |                        |                        |    injectors.          |                        |
    |                        |                        | *  Leaking fuel        |                        |
    |                        |                        |    pressure regulator. |                        |
    |                        |                        | *  Low fuel pressure   |                        |
    |                        |                        |    or running out of   |                        |
    |                        |                        |    fuel.               |                        |
    |                        |                        | *  Vapor recovery      |                        |
    |                        |                        |    system.             |                        |
    |                        |                        | *  Induction system:   |                        |
    |                        |                        |   -  Air leaks after   |                        |
    |                        |                        |      the MAF.          |                        |
    |                        |                        |   -  Vacuum Leaks.     |                        |
    |                        |                        |   -  PCV system.       |                        |
    |                        |                        |   -  Improperly seated |                        |
    |                        |                        |      engine oil        |                        |
    |                        |                        |      dipstick.         |                        |
    |                        |                        | *  EGR system:         |                        |
    |                        |                        |   -  Leaking gasket.   |                        |
    |                        |                        |   -  Stuck EGR valve.  |                        |
    |                        |                        |   -  Leaking diaphragm |                        |
    |                        |                        |      or EVR.           |                        |
    |                        |                        | *  Base Engine:        |                        |
    |                        |                        |   -  Oil overfill.     |                        |
    |                        |                        |   -  Cam timing.       |                        |
    |                        |                        |   -  Cylinder          |                        |
    |                        |                        |      compression.      |                        |
    |                        |                        |   -  Exhaust leaks     |                        |
    |                        |                        |      before or near    |                        |
    |                        |                        |      the HO2Ss.        |                        |
    |________________________|________________________|________________________|________________________|
    | P0176 - Flexible Fuel  | The FF sensor input    | *  Open or short in FF | A flex fuel (FF) PID   |
    | (FF) Sensor Circuit    | signal to PCM is       |    sensor VPWR circuit | reading of 0 Hz with   |
    | Malfunction            | continuously           | *  Open in battery     | the key ON and engine  |
    |                        | monitored. The test    |    ground to FF sensor | OFF or with engine at  |
    |                        | fails when the signal  |    circuit             | idle indicates a hard  |
    |                        | falls out of a maximum | *  Open in FF sensor   | fault.                 |
    |                        | or minimum calibrated  |    signal circuit      |                        |
    |                        | range.                 | *  Short to ground in  |                        |
    |                        |                        |    FF sensor signal    |                        |
    |                        |                        |    circuit             |                        |
    |                        |                        | *  Fuel contamination  |                        |
    |                        |                        | *  Short to VPWR in FF |                        |
    |                        |                        |    sensor battery      |                        |
    |                        |                        |    ground circuit      |                        |
    |                        |                        | *  Short to VPWR in FF |                        |
    |                        |                        |    sensor signal       |                        |
    |                        |                        |    circuit             |                        |
    |                        |                        | *  Fuel separation     |                        |
    |                        |                        | *  Damaged FF sensor   |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0180 - Engine Fuel    | The comprehensive      | *  Open or short in    | Verify EFT-PID value   |
    | Temperature Sensor A   | component monitor      |    harness.            | to determine open or   |
    | Circuit Low Input      | (CCM) monitors the EFT | *  Low ambient         | short.                 |
    | (EFT)                  | sensor circuit to the  |    temperature         |                        |
    |                        | PCM for low and high   |    operation.          |                        |
    |                        | voltage. If voltage    | *  Improper harness    |                        |
    |                        | were to fall below or  |    connection.         |                        |
    |                        | exceed a calibrated    | *  Damaged EFT sensor. |                        |
    |                        | limit and amount of    | *  Damaged PCM.        |                        |
    |                        | time during testing,   |                        |                        |
    |                        | the test will fail.    |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0181 - Engine Fuel    | The comprehensive      | *  Open or short in    | Verify EFT-PID value   |
    | Temperature Sensor A   | component monitor      |    harness.            | to determine open or   |
    | Circuit Range/         | (CCM) monitors the EFT | *  Low ambient         | short.                 |
    | Performance (EFT)      | Temperature for        |    temperature         |                        |
    |                        | acceptable operating   |    operation.          |                        |
    |                        | temperature. If during | *  Improper harness    |                        |
    |                        | testing voltage were   |    connection.         |                        |
    |                        | to fall below or       | *  Damaged EFT sensor. |                        |
    |                        | exceed a calibrated    | *  Damaged PCM.        |                        |
    |                        | limit, a calibrated    |                        |                        |
    |                        | amount of time the     |                        |                        |
    |                        | test will fail.        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0182 - Engine Fuel    | The comprehensive      | *  Short in harness.   | Verify EFT-PID and     |
    | Temperature Sensor A   | component monitor      | *  VREF open or        | VREF values to         |
    | Circuit Low Input      | (CCM) monitors the EFT |    shorted.            | determine open or      |
    | (EFT)                  | sensor circuit to the  | *  Low ambient         | short.                 |
    |                        | PCM for low voltage.   |    temperature         |                        |
    |                        | If voltage were to     |    operation.          |                        |
    |                        | fall below a           | *  Improper harness    |                        |
    |                        | calibrated limit and   |    connection.         |                        |
    |                        | amount of time during  | *  Damaged EFT sensor. |                        |
    |                        | testing, the test will | *  Damaged PCM.        |                        |
    |                        | fail.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0183 - Engine Fuel    | The comprehensive      | *  Open or short to    | Verify EFT-PID value   |
    | Temperature Sensor A   | component monitor      |    PWR in harness.     | to determine open or   |
    | Circuit High Input     | (CCM) monitors the EFT | *  Damaged EFT sensor. | short.                 |
    | (EFT)                  | sensor circuit to the  | *  Improper harness    |                        |
    |                        | PCM for high voltage.  |    connection.         |                        |
    |                        | If voltage were to     | *  Damaged PCM.        |                        |
    |                        | exceed a calibrated    |                        |                        |
    |                        | limit and a calibrated |                        |                        |
    |                        | amount of time during  |                        |                        |
    |                        | testing, the test will |                        |                        |
    |                        | fail.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0186 - Engine Fuel    | See DTC P0181.         |                        |                        |
    | Temperature Sensor B   |                        |                        |                        |
    | Circuit Range          |                        |                        |                        |
    | /Performance (EFT)     |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0187 - Engine Fuel    | See DTC P0182.         |                        |                        |
    | Temperature Sensor B   |                        |                        |                        |
    | Circuit Low Input      |                        |                        |                        |
    | (EFT).                 |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0188 - Engine Fuel    | See DTC P0183.         |                        |                        |
    | Temperature Sensor B   |                        |                        |                        |
    | Circuit High Input     |                        |                        |                        |
    | (EFT)                  |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0190 - Fuel Rail      | The comprehensive      | *  VREF open in        | Verify VREF voltage    |
    | Pressure Sensor        | component monitor      |    harness.            | between 4.0 and 6.0V.  |
    | Circuit Malfunction    | (CCM) monitors the FRP | *  VREF open in        |                        |
    | (FRP)                  | sensor to the PCM for  |    sensor.             |                        |
    |                        | VREF voltage. The test | *  VREF open in PCM.   |                        |
    |                        | fails when the VREF    |                        |                        |
    |                        | voltage from the PCM   |                        |                        |
    |                        | drops to a voltage     |                        |                        |
    |                        | less than a minimum    |                        |                        |
    |                        | calibrated value.      |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0191 - Fuel Rail      | The comprehensive      | *  High fuel pressure. | A FRP PID value during |
    | Pressure Sensor        | component monitor      | *  Low fuel pressure.  | KOER of 138 kpa (20    |
    | Circuit Performance    | (CCM) monitors the FRP | *  Damaged FRP sensor. | psi) and 413 kpa (60   |
    | (FRP)                  | pressure for           | *  Excessive           | psi) for gasoline or   |
    |                        | acceptable fuel        |    resistance in       | 586 kpa (85 psi) and   |
    |                        | pressure. The test     |    circuit.            | 725 kpa (105 psi) for  |
    |                        | fails when the fuel    | *  Low or no fuel.     | natural gas vehicles   |
    |                        | pressure falls below   |                        | (NG) is acceptable.    |
    |                        | or exceeds a minimum   |                        |                        |
    |                        | /maximum calibrated    |                        |                        |
    |                        | value for a calibrated |                        |                        |
    |                        | period of time.        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0192 - Fuel Rail      | The comprehensive      | *  FRP signal shorted  | A FRP PID value during |
    | Pressure Sensor        | component monitor      |    to SIG RTN or PWR   | KOER or KOEO less than |
    | Circuit Low Input      | (CCM) monitors the FRP |    GND.                | 0.3 volts for gasoline |
    | (FRP)                  | sensor circuit to the  | *  FRP signal open (NG | or 0.5 volts for       |
    |                        | PCM for low voltage.   |    only)               | natural gas vehicles   |
    |                        | If voltage were to     | *  Low fuel pressure   | (NG) would indicate a  |
    |                        | fall below a           |    (NG only)           | hard fault.            |
    |                        | calibrated limit and   | *  Damaged FRP sensor. |                        |
    |                        | amount of time during  | *  Damaged PCM.        |                        |
    |                        | testing, the test will |                        |                        |
    |                        | fail.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0193 - Fuel Rail      | The comprehensive      | *  FRP signal shorted  | A FRP PID value during |
    | Pressure Sensor        | component monitor      |    to VREF or VPWR.    | KOER or KOEO less than |
    | Circuit High Input     | (CCM) monitors the FRP | *  FRP signal open     | 0.3 volts for gasoline |
    | (FRP)                  | sensor circuit to the  |    (gasoline only)     | or 0.5 volts for       |
    |                        | PCM for high voltage.  | *  Low fuel pressure   | natural gas vehicles   |
    |                        | If voltage were to     |    (NG only)           | (NG) would indicate a  |
    |                        | fall below a           | *  Damaged FRP sensor. | hard fault.            |
    |                        | calibrated limit and a | *  Damaged PCM.        |                        |
    |                        | calibrated amount of   | *  High fuel pressure  |                        |
    |                        | time during testing,   |    (caused by damaged  |                        |
    |                        | the test will fail.    |    fuel pressure       |                        |
    |                        |                        |    regulator) NG.      |                        |
    |________________________|________________________|________________________|________________________|
    | P0230 - Fuel Pump      | NOTE: For natural gas  | *  Open or shorted     | *  When the FPF PID    |
    | Primary Circuit        | applications, the      |    fuel pump (FP)      |    reads YES, a fault  |
    | Malfunction            | following description  |    circuit             |    is currently        |
    |                        | applies to the fuel    | *  Open VPWR circuit   |    present.            |
    |                        | shutoff valve (FSV)    |    to fuel pump relay  | *  An open circuit or  |
    |                        | circuit. The PCM       | *  Damaged fuel pump   |    short to ground can |
    |                        | monitors the fuel pump |    relay               |    only be detected    |
    |                        | (FP) circuit output    | *  Damaged PCM         |    with the fuel pump  |
    |                        | from the PCM. The test |                        |    commanded OFF.      |
    |                        | fails if: With the FP  |                        | *  A short to power    |
    |                        | output commanded ON    |                        |    can only be         |
    |                        | (grounded), excessive  |                        |    detected with the   |
    |                        | current draw is        |                        |    fuel pump commanded |
    |                        | detected on the FP     |                        |    ON.                 |
    |                        | circuit; or with the   |                        | *  During KOEO and     |
    |                        | FP output commanded    |                        |    KOER self-test, the |
    |                        | OFF, voltage is not    |                        |    fuel pump output    |
    |                        | detected on the FP     |                        |    command will be     |
    |                        | circuit (the PCM       |                        |    cycled ON and OFF.  |
    |                        | expects to detect VPWR |                        |                        |
    |                        | voltage coming through |                        |                        |
    |                        | the fuel pump relay    |                        |                        |
    |                        | coil to the FP         |                        |                        |
    |                        | circuit).              |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0231 - Fuel Pump      | NOTE: For natural gas  | *  Open B+ circuit to  | During KOEO self-test, |
    | Secondary Circuit Low  | applications, the      |    the fuel pump relay | the PCM will command   |
    |                        | following description  | *  Open FP PWR circuit | the fuel pump ON so    |
    |                        | applies to the fuel    |    between the fuel    | this test can be       |
    |                        | shutoff valve monitor  |    pump relay and its  | performed.             |
    |                        | (FSVM) and the fuel    |    connection to the   |                        |
    |                        | shutoff valve power    |    FPM circuit         |                        |
    |                        | (FSV PWR) circuits.    | *  Damaged fuel pump   |                        |
    |                        | The PCM monitors the   |    relay               |                        |
    |                        | fuel pump monitor      | *  Damaged PCM (engine |                        |
    |                        | (FPM) circuit. The     |    will start)         |                        |
    |                        | test fails if the PCM  | *  For 4.6L Mustang,   |                        |
    |                        | commands the fuel pump |    open FP PWR circuit |                        |
    |                        | ON and B+ voltage is   |    from low speed fuel |                        |
    |                        | not detected on the    |    pump relay, through |                        |
    |                        | FPM circuit.           |    resistor to FPM     |                        |
    |                        |                        |    splice (engine will |                        |
    |                        |                        |    start)              |                        |
    |                        |                        | *  For 5.4L SC         |                        |
    |                        |                        |    Lightning, damaged  |                        |
    |                        |                        |    IFS switch, IFS     |                        |
    |                        |                        |    switch relay, or    |                        |
    |                        |                        |    concern with        |                        |
    |                        |                        |    related circuits.   |                        |
    |________________________|________________________|________________________|________________________|
    | P0232 - Fuel Pump      | NOTE: For natural gas  | *  Inertia fuel        | P0232 can be set if    |
    | Secondary Circuit High | applications, the      |    shutoff (IFS)       | the fuel pump circuit  |
    |                        | following description  |    switch not reset or | is activated when the  |
    |                        | applies to the fuel    |    electrically open   | PCM expected the       |
    |                        | shutoff valve monitor  | *  Open circuit        | circuit to be off      |
    |                        | (FSVM) and the fuel    |    between the fuel    | (i.e. fuel system test |
    |                        | shutoff valve power    |    pump and the FPM    | or prime procedure).   |
    |                        | (FSV PWR) circuits.    |    connection to the   | *  EDIS system failure |
    |                        | The PCM monitors the   |    FP PWR circuit      | *  High speed fuel     |
    |                        | fuel pump monitor      | *  Poor fuel pump      |    pump failure        |
    |                        | (FPM) circuit. This    |    ground              | *  Engine speed        |
    |                        | test fails when the    | *  Fuel pump           |    exceeds calibrated  |
    |                        | PCM detects voltage on |    electrically open   |    threshold           |
    |                        | the FPM circuit while  | *  Fuel pump secondary | *  Transmission        |
    |                        | the fuel pump is       |    circuits short to   |    electronic pressure |
    |                        | commanded OFF. The FPM |    power               |    control (EPC)       |
    |                        | circuit is wired to a  | *  Fuel pump relay     |    solenoid failure    |
    |                        | pull-up voltage inside |    contacts always     | *  Cylinder head       |
    |                        | the PCM. The FPM       |    closed              |    temperature (CHT)   |
    |                        | circuit will go high   | *  Open FPM circuit    |    exceed calibrated   |
    |                        | if, with the key ON    |    between PCM and     |    limit               |
    |                        | and the fuel pump      |    connection to FP    |                        |
    |                        | commanded OFF, the FPM |    PWR circuit         |                        |
    |                        | /FP PWR circuit loses  | *  Damaged low speed   |                        |
    |                        | its path to ground     |    fuel pump relay or  |                        |
    |                        | through the fuel pump. |    concern with        |                        |
    |                        | The FPM circuit will   |    related circuits    |                        |
    |                        | also go high if the    |    (if equipped).      |                        |
    |                        | FPM/FP PWR circuit is  | *  Damaged PCM         |                        |
    |                        | shorted to power.      |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0234 - Supercharger   | The PCM disables       | *  Brake torque (brake | Check for other        |
    | Overboost Condition    | (bypasses) the         |    on and throttle at  | diagnostic trouble     |
    |                        | supercharger boost and |    wide open)          | codes accompanying the |
    |                        | sets a diagnostic      | *  Transmission oil    | P0234 or check         |
    |                        | trouble code (DTC) to  |    temperature (TOT)   | appropriate and        |
    |                        | keep from damaging the |    exceeds calibrated  | available PIDs related |
    |                        | powertrain (engine or  |    threshold           | to above possible      |
    |                        | transmission) during   | *  Engine over         | causes.                |
    |                        | potential harmful      |    temperature         |                        |
    |                        | operating conditions.  | *  Ignition misfire    |                        |
    |                        |                        |    exceeds calibrated  |                        |
    |                        |                        |    threshold           |                        |
    |                        |                        | *  Knock sensor (KS)   |                        |
    |                        |                        |    failure or knock    |                        |
    |                        |                        |    detected            |                        |
    |                        |                        | *  Low speed fuel pump |                        |
    |                        |                        |    relay not switching |                        |
    |________________________|________________________|________________________|________________________|
    | P0243 - Supercharger   | The PCM monitors the   | *  VPWR circuit open   | Disconnect SCB         |
    | (Boost) Bypass         | supercharger (boost)   |    to SCB solenoid     | solenoid. Connect test |
    | Solenoid Circuit       | bypass (SCB) solenoid  | *  SCB solenoid        | lamp to SCB solenoid   |
    | Malfunction            | circuit for an         |    circuit shorted to  | harness connector.     |
    |                        | electrical failure.    |    PWR GND or CHASSIS  | Cycle SCB driver in    |
    |                        | The test fails when    |    GND                 | PCM by Output Test     |
    |                        | the signal moves       | *  Damaged SCB         | Mode. Test lamp cycle  |
    |                        | outside the minimum or |    solenoid            | on and off - SCB       |
    |                        | maximum allowable      | *  SCB solenoid        | solenoid is suspect.   |
    |                        | calibrated parameters  |    circuit open        | Test lamp always on -  |
    |                        | for a specified SCB    | *  SCB solenoid        | SCB signal short in    |
    |                        | solenoid duty cycle    |    circuit shorted to  | harness or PCM. Test   |
    |                        | (100% or 0%) by PCM    |    VPWR                | always off - SCB       |
    |                        | command.               | *  Damaged PCM         | signal or VPWR open in |
    |                        |                        |                        | harness or PCM.        |
    |________________________|________________________|________________________|________________________|
    | P0298 - Engine Oil     | Indicates the Engine   | *  Very high engine    | Engine operating in    |
    | Over Temperature       | Oil Temperature        |    rpm for extended    | high rpm range, due to |
    | Condition              | Protection strategy in |    period of time.     | improper gear          |
    |                        | the PCM has been       | *  Over-heating        | selection. May cause   |
    |                        | activated. This will   |    condition.          | Lack/Loss of Power or  |
    |                        | temporarily prohibit   | *  Malfunction EOT     | Surge customer         |
    |                        | high engine speed      |    sensor or circuit   | concern.               |
    |                        | operation by disabling |    (vehicles w/EOT     |                        |
    |                        | injectors, therefore   |    sensor).            |                        |
    |                        | reducing the risk of   | *  Base engine         |                        |
    |                        | engine damage from     |    concerns.           |                        |
    |                        | high engine oil        |                        |                        |
    |                        | temperature. Note: On  |                        |                        |
    |                        | engines which are      |                        |                        |
    |                        | equipped with an oil   |                        |                        |
    |                        | temperature sensor,    |                        |                        |
    |                        | the PCM reads oil      |                        |                        |
    |                        | temperature to         |                        |                        |
    |                        | determine if it is     |                        |                        |
    |                        | excessive. When an oil |                        |                        |
    |                        | temperature sensor is  |                        |                        |
    |                        | not present, the PCM   |                        |                        |
    |                        | uses an oil algorithm  |                        |                        |
    |                        | to infer actual        |                        |                        |
    |                        | temperature. Engine    |                        |                        |
    |                        | shutdown strategy      |                        |                        |
    |                        | function is the same   |                        |                        |
    |                        | on vehicles with and   |                        |                        |
    |                        | without oil            |                        |                        |
    |                        | temperature sensors.   |                        |                        |
    |________________________|________________________|________________________|________________________|
</PRE>
 

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Re: STICKY ME! DTC Descriptions

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<PRE>
    |          DTC           |      Description       |    Possible Causes     |    Diagnostic Aides    |
    |________________________|________________________|________________________|________________________|
    | P0300 - Random Misfire | The random misfire DTC | *  Camshaft position   |                        |
    |                        | indicates multiple     |    sensor (CMP)        |                        |
    |                        | cylinders are          | *  Low fuel: less than |                        |
    |                        | misfiring or the PCM   |    1/8 tank            |                        |
    |                        | cannot identify which  | *  Stuck open EGR      |                        |
    |                        | cylinder is misfiring. |    valve               |                        |
    |________________________|________________________|________________________|________________________|
    | P0301 through P0310 -  | The misfire detection  | *  Ignition system     | The MIL will blink     |
    | Misfire Detection      | monitor is designed to | *  Fuel injectors      | once per second when a |
    | Monitor                | monitor engine misfire | *  Running out of fuel | misfire is detected    |
    |                        | and identify the       | *  EVAP canister purge | severe enough to cause |
    |                        | specific cylinder in   |    valve               | catalyst damage. If    |
    |                        | which the misfire has  | *  Fuel pressure       | the MIL is on steady   |
    |                        | occurred. Misfire is   | *  Evaporative         | state, due to a        |
    |                        | defined as lack of     |    emission system     | misfire, this will     |
    |                        | combustion in a        | *  Base engine         | indicate the threshold |
    |                        | cylinder due to        |                        | for  emissions was     |
    |                        | absence of spark, poor |                        | exceeded and cause the |
    |                        | fuel metering, poor    |                        | vehicle to fail an     |
    |                        | compression, or any    |                        | inspection and         |
    |                        | other cause.           |                        | maintenance tailpipe   |
    |                        |                        |                        | test.                  |
    |________________________|________________________|________________________|________________________|
    | P0320 - Ignition       | The ignition engine    | *  Loose wires/        | The DTC indicates that |
    | Engine Speed Input     | speed sensor input     |    connectors.         | two successive erratic |
    | Circuit Malfunction    | signal to PCM is       | *  Arcing secondary    | PIP pulses occurred.   |
    |                        | continuously           |    ignition components |                        |
    |                        | monitored. The test    |    (coil, wires and    |                        |
    |                        | fails when the signal  |    plugs)              |                        |
    |                        | indicates that two     | *  On board            |                        |
    |                        | successive erratic     |    transmitter (2-way  |                        |
    |                        | profile ignition       |    radio)              |                        |
    |                        | pickup (PIP) pulses    |                        |                        |
    |                        | have occurred.         |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0325 - Knock Sensor 1 |                        |                        |                        |
    | Circuit Malfunction    |                        |                        |                        |
    | (Bank 1)               |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0326 - Knock Sensor 1 | The knock sensor       | *  Knock sensor        | A knock sensor voltage |
    | Circuit Range/         | detects vibrations     |    circuit short to    | greater than 0.5V with |
    | Performance (Bank 1)   | upon increase and      |    GND                 | the key ON and engine  |
    |                        | decrease in engine     | *  Knock sensor        | OFF indicates a hard   |
    |                        | rpm. The knock sensor  |    circuit short to    | fault.                 |
    |                        | generates a voltage    |    PWR                 |                        |
    |                        | based on this          | *  Knock sensor        |                        |
    |                        | vibration. Should this |    circuit open        |                        |
    |                        | voltage go outside a   | *  Damaged knock       |                        |
    |                        | calibrated level a DTC |    sensor              |                        |
    |                        | will set.              | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0330 - Knock Sensor 2 |                        |                        |                        |
    | Circuit Malfunction    |                        |                        |                        |
    | (Bank 2)               |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0331 - Knock Sensor 2 | The knock sensor       | *  Knock sensor        | A knock sensor voltage |
    | Circuit Range          | detects vibration upon |    circuit short to    | greater than 0.5V with |
    | /performance (Bank 2)  | increase and decrease  |    GND                 | the key ON and engine  |
    |                        | in engine rpm. The     | *  Knock sensor        | OFF indicates a hard   |
    |                        | knock sensor generates |    circuit short to    | fault.                 |
    |                        | a voltage based on     |    PWR                 |                        |
    |                        | this vibration. Should | *  Damaged knock       |                        |
    |                        | this voltage go        |    sensor              |                        |
    |                        | outside a calibrated   | *  Damaged PCM         |                        |
    |                        | level a DTC will set.  | *  Knock sensor        |                        |
    |                        |                        |    circuit open        |                        |
    |________________________|________________________|________________________|________________________|
    | P0340 - Camshaft       | The test fails when    | *  CMP circuit open    | Harness routing,       |
    | Position (CMP) Sensor  | the PCM can no longer  | *  CMP circuit short   | harness alterations,   |
    | Circuit Malfunction    | detect the signal from |    to GND              | improper shielding, or |
    |                        | the CMP sensor.        | *  CMP circuit short   | electrical             |
    |                        |                        |    to PWR              | interference from      |
    |                        |                        | *  SIG RTN open (VR    | other improperly       |
    |                        |                        |    sensor)             | functioning systems    |
    |                        |                        | *  CMP GND open (Hall  | may have intermittent  |
    |                        |                        |    effect sensor)      | impact on the CMP      |
    |                        |                        | *  CMP misinstalled    | signal.                |
    |                        |                        |    (Hall effect        |                        |
    |                        |                        |    sensor)             |                        |
    |                        |                        | *  Damaged CMP sensor  |                        |
    |                        |                        |    shielding           |                        |
    |                        |                        | *  Damaged CMP sensor  |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0350 - Ignition Coil  | Each ignition primary  | *  Open or short in    |                        |
    | (Undetermined) Primary | circuit is             |    Ignition START/RUN  |                        |
    | / Secondary Circuit    | continuously           |    circuit             |                        |
    | Malfunction            | monitored. The test    | *  Open coil driver    |                        |
    |                        | fails when the PCM     |    circuit             |                        |
    |                        | does not receive a     | *  Coil driver circuit |                        |
    |                        | valid IDM pulse signal |    shorted to ground   |                        |
    |                        | from the ignition      | *  Damaged coil        |                        |
    |                        | module (integrated in  | *  Damaged PCM         |                        |
    |                        | PCM).                  | *  Coil driver circuit |                        |
    |                        |                        |    shorted to VPWR     |                        |
    |________________________|________________________|________________________|________________________|
    | P0351 Through P0360 -  | Each ignition primary  | *  Open or short in    |                        |
    | Ignition Coil A        | circuit is             |    Ignition START/RUN  |                        |
    | through J Primary/     | continuously           |    circuit             |                        |
    | Secondary Circuit      | monitored. The test    | *  Open coil driver    |                        |
    | Malfunction            | fails when the PCM     |    circuit in harness  |                        |
    |                        | does not receive a     | *  Coil driver circuit |                        |
    |                        | valid IDM pulse signal |    shorted to ground   |                        |
    |                        | from the ignition      | *  Damaged coil        |                        |
    |                        | module (integrated in  | *  Damaged PCM         |                        |
    |                        | PCM).                  | *  Coil driver circuit |                        |
    |                        |                        |    shorted to PWR      |                        |
    |________________________|________________________|________________________|________________________|
    | P0401 - EGR Flow       | The EGR system is      | *  Vacuum supply       | Perform KOER self-test |
    | Insufficient Detected  | monitored during       | *  EGR valve stuck     | and look for DTC P1408 |
    |                        | steady state driving   |    closed              | as an indication of a  |
    |                        | conditions while the   | *  EGR valve leaks     | hard fault. If P1408   |
    |                        | EGR is commanded on.   |    vacuum              | is not present, look   |
    |                        | The test fails when    | *  EGR flow path       | for contamination,     |
    |                        | the signal from the    |    restricted          | restrictions, leaks,   |
    |                        | DPF EGR sensor         | *  EGRVR circuit       | and intermittents.     |
    |                        | indicates that EGR     |    shorted to PWR      |                        |
    |                        | flow is less than the  | *  VREF open to DPF    |                        |
    |                        | desired minimum.       |    EGR sensor          |                        |
    |                        |                        | *  DPF EGR sensor      |                        |
    |                        |                        |    downstream hose off |                        |
    |                        |                        |    or plugged          |                        |
    |                        |                        | *  EGRVR circuit open  |                        |
    |                        |                        |    to PCM              |                        |
    |                        |                        | *  VPWR open to EGRVR  |                        |
    |                        |                        |    solenoid            |                        |
    |                        |                        | *  DPF EGR sensor      |                        |
    |                        |                        |    hoses both off      |                        |
    |                        |                        | *  DPF EGR sensor      |                        |
    |                        |                        |    hoses reversed      |                        |
    |                        |                        | *  Damaged EGR orifice |                        |
    |                        |                        |    tube                |                        |
    |                        |                        | *  Damaged EGRVR       |                        |
    |                        |                        |    solenoid            |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0402 - EGR Flow       | The EGR system is      | *  EGR valve stuck     | A DPFEGR PID reading   |
    | Excessive Detected     | monitored for          |    open                | that is greater at     |
    |                        | undesired EGR flow     | *  Plugged EGR vacuum  | idle than during key   |
    |                        | during idle. The EGR   |    regulator solenoid  | ON and engine OFF by   |
    |                        | monitor looks at the   |    vent                | 0.5 volt or a rough    |
    |                        | DPF EGR signal at idle | *  Plugged EGR tube    | engine idle, may       |
    |                        | and compares it to the | *  Slow responding DPF | indicate a hard fault. |
    |                        | stored signal measured |    EGR sensor          |                        |
    |                        | during key ON and      | *  Damaged DPF EGR     |                        |
    |                        | engine OFF. The test   |    sensor              |                        |
    |                        | fails when the signal  | *  Improper vacuum     |                        |
    |                        | at idle is greater     |    hose connection     |                        |
    |                        | than at key ON engine  | *  Plugged vacuum      |                        |
    |                        | OFF by a calibrated    |    hoses               |                        |
    |                        | amount.                | *  EGRVR circuit       |                        |
    |                        |                        |    shorted to ground   |                        |
    |                        |                        | *  Damaged EGR vacuum  |                        |
    |                        |                        |    regulator solenoid  |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0411 - Secondary Air  | See DTC P1411          |                        |                        |
    | Injection (AIR) system |                        |                        |                        |
    | upstream flow          |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0412 - Secondary Air  | The PCM attempts to    | *  AIR circuit open    | The AIR circuit is     |
    | Injection System (AIR) | control when air is    | *  AIR bypass solenoid | normally held high     |
    | circuit malfunction    | injected in the        |    fault               | through the AIR bypass |
    |                        | exhaust. The DTC       | *  Damaged PCM         | solenoid and SSR when  |
    |                        | indicates a Secondary  | *  AIR circuit short   | the output driver is   |
    |                        | Air injection system   |    to power            | off. Therefore, a low  |
    |                        | AIR circuit fault.     | *  Solid state relay   | AIR circuit indicates  |
    |                        |                        |    fault               | a driver is always on  |
    |                        |                        | *  Damaged AIR pump    | and a high circuit     |
    |                        |                        |                        | indicates an open in   |
    |                        |                        |                        | the PCM.               |
    |________________________|________________________|________________________|________________________|
    | P0420 - Catalyst       | Indicates Bank 1       | *  Use of leaded fuel  | -  Compare HO2S        |
    | System Efficiency      | catalyst system        | *  Damaged HO2S        |    upstream &          |
    | Below Threshold (Bank  | efficiency is below    | *  Malfunctioning ECT  |    downstream switch   |
    | 1)                     | the acceptable         | *  High fuel pressure  |    rate. Under normal  |
    |                        | threshold              | *  Damaged exhaust     |    closed loop fuel    |
    |                        |                        |    manifold            |    conditions, high    |
    |                        |                        | *  Damaged catalytic   |    efficiency          |
    |                        |                        |    converter           |    catalysts have      |
    |                        |                        | *  Oil contamination   |    oxygen storage      |
    |                        |                        | *  Cylinder misfiring  |    which makes the     |
    |                        |                        | *  Downstream HO2S     |    switching frequency |
    |                        |                        |    wires improperly    |    of the downstream   |
    |                        |                        |    connected           |    HO2S quite slow     |
    |                        |                        | *  Damaged exhaust     |    compared to the     |
    |                        |                        |    system pipe         |    upstream HO2S. As   |
    |                        |                        | *  Damaged muffler     |    catalyst efficiency |
    |                        |                        |    /tailpipe assembly  |    deteriorates, its   |
    |                        |                        | *  Retarded spark      |    ability to store    |
    |                        |                        |    timing              |    oxygen declines and |
    |                        |                        |                        |    the downstream HO2S |
    |                        |                        |                        |    signal begins to    |
    |                        |                        |                        |    switch more rapidly |
    |                        |                        |                        |    approaching the     |
    |                        |                        |                        |    switching rate of   |
    |                        |                        |                        |    the upstream HO2S.  |
    |                        |                        |                        |    Once beyond an      |
    |                        |                        |                        |    acceptable limit    |
    |                        |                        |                        |    the DTC is set.     |
    |________________________|________________________|________________________|________________________|
    | P0430 - Catalyst       | Indicates Bank 2       | *  Use of leaded fuel  | Compare HO2S upstream  |
    | System Efficiency      | catalyst system        | *  Damaged HO2S        | & downstream switch    |
    | Below Threshold (Bank  | efficiency is below    | *  Malfunctioning ECT  | rate. Under normal     |
    | 2)                     | the acceptable         | *  High fuel pressure  | closed loop fuel       |
    |                        | threshold.             | *  Damaged exhaust     | conditions, high       |
    |                        |                        |    manifold            | efficiency catalysts   |
    |                        |                        | *  Damaged catalytic   | have oxygen storage    |
    |                        |                        |    converter           | which makes the        |
    |                        |                        | *  Oil contamination   | switching frequency of |
    |                        |                        | *  Cylinder misfiring  | the downstream HO2S    |
    |                        |                        | *  Downstream HO2S     | quite slow compared to |
    |                        |                        |    wires improperly    | the upstream HO2S. As  |
    |                        |                        |    connected           | catalyst efficiency    |
    |                        |                        | *  Damaged exhaust     | deteriorates, its      |
    |                        |                        |    system pipe         | ability to store       |
    |                        |                        | *  Damaged muffler/    | oxygen declines and    |
    |                        |                        |    tailpipe assembly   | the downstream HO2S    |
    |                        |                        | *  Retarded spark      | signal begins to       |
    |                        |                        |    timing              | switch more rapidly    |
    |                        |                        |                        | approaching the        |
    |                        |                        |                        | switching rate of the  |
    |                        |                        |                        | upstream HO2S. Once    |
    |                        |                        |                        | beyond an acceptable   |
    |                        |                        |                        | limit the DTC is set.  |
    |________________________|________________________|________________________|________________________|
    | P0442 - EVAP Control   | The PCM monitors the   | *  After-market EVAP   |                        |
    | System Leak Detected   | complete EVAP control  |    hardware (such as   |                        |
    | (Small Leak)           | system for presence of |    fuel filler cap)    |                        |
    |                        | a small fuel vapor     |    non-conforming to   |                        |
    |                        | leak. The system       |    required            |                        |
    |                        | failure occurs when a  |    specifications      |                        |
    |                        | fuel vapor leak from   | *  Small holes or cuts |                        |
    |                        | an opening as small as |    in fuel vapor hoses |                        |
    |                        | 0.10 cm (0.04 inch) is |    /tubes              |                        |
    |                        | detected by the EVAP   | *  Canister vent       |                        |
    |                        | running loss monitor   |    solenoid stays      |                        |
    |                        | test.                  |    partially open on   |                        |
    |                        |                        |    closed command      |                        |
    |                        |                        | *  Damaged, cross      |                        |
    |                        |                        |    -threaded or        |                        |
    |                        |                        |    loosely installed   |                        |
    |                        |                        |    fuel filler cap     |                        |
    |                        |                        | *  Loose fuel vapor    |                        |
    |                        |                        |    hose/tube           |                        |
    |                        |                        |    connections to EVAP |                        |
    |                        |                        |    system components   |                        |
    |                        |                        | *  EVAP system         |                        |
    |                        |                        |    component seals     |                        |
    |                        |                        |    leaking (EVAP       |                        |
    |                        |                        |    canister purge      |                        |
    |                        |                        |    valve, fuel tank    |                        |
    |                        |                        |    pressure sensor,    |                        |
    |                        |                        |    canister vent       |                        |
    |                        |                        |    solenoid, fuel      |                        |
    |                        |                        |    vapor control valve |                        |
    |                        |                        |    tube assembly or    |                        |
    |                        |                        |    fuel vapor vent     |                        |
    |                        |                        |    valve assembly)     |                        |
    |________________________|________________________|________________________|________________________|
    | P0443 - EVAP Control   | The PCM monitors the   | *  VPWR circuit open   | Monitor EVAPPDC PID    |
    | System Canister Purge  | EVAP canister purge    | *  EVAP canister purge | and voltage between    |
    | Valve Circuit          | valve circuit for an   |    valve circuit       | EVAP canister valve    |
    | Malfunction            | electrical failure.    |    shorted to GND      | signal and PWR GND in  |
    |                        | The test fails when    | *  Damaged EVAP        | output test mode with  |
    |                        | the signal moves       |    canister purge      | key ON engine OFF (or  |
    |                        | outside the minimum or |    valve               | in key ON engine       |
    |                        | maximum allowable      | *  EVAP canister purge | RUNNING mode). EVAPPDC |
    |                        | calibrated parameters  |    valve circuit open  | PID at 0% and voltage  |
    |                        | for a specified purge  | *  EVAP canister purge | less than 1.0 volts    |
    |                        | duty cycle by PCM      |    valve circuit       | (or EVAPPDC PID at     |
    |                        | command.               |    shorted to VPWR     | 100% and voltage       |
    |                        |                        | *  Damaged PCM         | greater than 0.5       |
    |                        |                        |                        | volts) indicates a     |
    |                        |                        |                        | hard fault.            |
    |________________________|________________________|________________________|________________________|
    | P0452 - FTP Sensor     | The PCM monitors the   | *  Contamination       | FTP V PID reading less |
    | Circuit Low Voltage    | EVAP control system    |    internal to FTP     | than 0.22 volt with    |
    | Detected               | FTP sensor input       |    sensor connector    | key ON and engine OFF  |
    |                        | signal to the PCM. The | *  Damaged PCM         | or during any engine   |
    |                        | test fails when the    | *  FTP circuit shorted | operating mode         |
    |                        | signal average drops   |    to GND or SIG RTN   | indicates a hard       |
    |                        | below a minimum        | *  Damaged FTP sensor  | fault.                 |
    |                        | allowable calibrated   |                        |                        |
    |                        | parameter.             |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0453 - FTP Sensor     | The PCM monitors the   | *  FTP circuit open    | FTP V PID reading      |
    | Circuit High Voltage   | EVAP control system    | *  VREF shorted to     | greater than 4.50      |
    | Detected               | FTP sensor input       |    VPWR                | volts with key ON and  |
    |                        | signal to the PCM. The | *  Damaged PCM         | engine OFF or during   |
    |                        | test fails when the    | *  FTP circuit shorted | any engine operating   |
    |                        | signal average jumps   |    to VREF or VPWR     | mode indicates a hard  |
    |                        | above a minimum        | *  SIG RTN circuit     | fault.                 |
    |                        | allowable calibrated   |    open                |                        |
    |                        | parameter.             | *  Damaged FTP sensor  |                        |
    |________________________|________________________|________________________|________________________|
    | P0455 - EVAP Control   | The PCM monitors the   | *  After-market EVAP   | Check for audible      |
    | System Leak Detected   | complete EVAP control  |    hardware (such as   | vacuum noise or        |
    | (No Purge Flow or      | system for no purge    |    fuel filler cap)    | significant fuel odor  |
    | Large Leak)            | flow, the presence of  |    non-conforming to   | in the engine          |
    |                        | a large fuel vapor     |    required            | compartment or near    |
    |                        | leak or multiple small |    specifications      | the EVAP canister and  |
    |                        | fuel vapor leaks. The  | *  Disconnected or     | fuel tank.             |
    |                        | system failure occurs  |    cracked fuel EVAP   |                        |
    |                        | when no purge flow     |    canister tube, EVAP |                        |
    |                        | (attributed to fuel    |    canister purge      |                        |
    |                        | vapor blockages or     |    outlet tube or EVAP |                        |
    |                        | restrictions), a large |    return tube         |                        |
    |                        | fuel vapor leak or     | *  EVAP canister purge |                        |
    |                        | multiple fuel vapor    |    valve stuck closed  |                        |
    |                        | leaks are detected by  | *  Damaged EVAP        |                        |
    |                        | the EVAP running loss  |    canister            |                        |
    |                        | monitor test with the  | *  Damaged or missing  |                        |
    |                        | engine running (but    |    fuel filler cap     |                        |
    |                        | not at idle).          | *  Insufficient fuel   |                        |
    |                        |                        |    filler cap          |                        |
    |                        |                        |    installation        |                        |
    |                        |                        | *  Loose fuel vapor    |                        |
    |                        |                        |    hose/tube           |                        |
    |                        |                        |    connections to EVAP |                        |
    |                        |                        |    system components   |                        |
    |                        |                        | *  Blockages or        |                        |
    |                        |                        |    restrictions in     |                        |
    |                        |                        |    fuel vapor hoses    |                        |
    |                        |                        |    /tubes (items also  |                        |
    |                        |                        |    listed under        |                        |
    |                        |                        |    disconnections or   |                        |
    |                        |                        |    cracks)             |                        |
    |                        |                        | *  Fuel vapor control  |                        |
    |                        |                        |    valve tube assembly |                        |
    |                        |                        |    or fuel vapor vent  |                        |
    |                        |                        |    valve assembly      |                        |
    |                        |                        |    blocked             |                        |
    |                        |                        | *  Canister vent (CV)  |                        |
    |                        |                        |    solenoid stuck open |                        |
    |                        |                        | *  Mechanically        |                        |
    |                        |                        |    inoperative fuel    |                        |
    |                        |                        |    tank pressure (FTP) |                        |
    |                        |                        |    sensor              |                        |
    |________________________|________________________|________________________|________________________|
    | P0460 - Fuel Level     | The PCM monitors the   | *  Empty fuel tank     | Monitor FLI PID and    |
    | Sensor Circuit         | fuel level input (FLI) | *  Fuel pump (FP)      | FLI V PID in key ON    |
    | Malfunction            | circuit for electrical |    module stuck open   | engine RUNNING. FLI    |
    |                        | failure. The test      | *  Incorrectly         | PID at 25% fill (with  |
    |                        | fails when the signal  |    installed fuel      | none matching fuel     |
    |                        | moves outside the      |    gauge               | gauge) and FLI V PID   |
    |                        | minimum or maximum     | *  Damaged instrument  | less than 0.90 volts   |
    |                        | allowable calibrated   |    cluster             | [for FLI PID at 75%    |
    |                        | parameters for a       | *  CASE GND circuit    | fill (with none        |
    |                        | specified fuel fill    |    open                | matching fuel gauge)   |
    |                        | percentage in the fuel | *  FLI shorted to VPWR | and FLI V PID greater  |
    |                        | tank.                  | *  Damaged PCM         | than 2.45 volts]       |
    |                        |                        | *  Overfilled fuel     | indicates a hard       |
    |                        |                        |    tank                | fault.                 |
    |                        |                        | *  Fuel pump (FP)      |                        |
    |                        |                        |    module stuck closed |                        |
    |                        |                        | *  Damaged fuel gauge  |                        |
    |                        |                        | *  FLI circuit open    |                        |
    |                        |                        | *  FLI circuit shorted |                        |
    |                        |                        |    to CASE GND or PWR  |                        |
    |                        |                        |    GND                 |                        |
    |                        |                        | *  CSE GND shorted to  |                        |
    |                        |                        |    VPWR                |                        |
    |________________________|________________________|________________________|________________________|
    | P0500 - Vehicle Speed  | Indicates the          | *  Open in VSS+/VSS-   | Diagnostic Aids: -     |
    | Sensor (VSS)           | powertrain control     |    harness circuit.    | Monitor VSS PID while  |
    | Malfunction            | module (PCM) detected  | *  Open in TCSS signal | driving vehicle. This  |
    |                        | an error in the        |    or TCSS signal      | DTC is set when the    |
    |                        | vehicle speed          |    return harness      | PCM detects a sudden   |
    |                        | information. Vehicle   |    circuit.            | loss of VSS signal     |
    |                        | speed data is received | *  Short to GND in VSS | over a period of time. |
    |                        | from either the        |    harness circuit.    | If vehicle speed data  |
    |                        | vehicle speed sensor   | *  Short to GND in     | is lost, check source  |
    |                        | (VSS), transfer case   |    TCSS harness        | of where vehicle speed |
    |                        | speed sensor (TCSS),   |    circuit.            | signal originates.     |
    |                        | anti-lock brake system | *  Short to PWR in VSS | Note TCSS does not     |
    |                        | (ABS) control module,  |    harness circuit.    | have a PID, circuitry  |
    |                        | generic electronic     | *  Short to PWR in     | frequency must be      |
    |                        | module (GEM), or       |    TCSS harness        | checked for sudden     |
    |                        | central timer module   |    circuit.            | loss of sensor signal. |
    |                        | (CTM). If the engine   | *  Open or short in    |                        |
    |                        | rpm is above the       |    the vehicle speed   |                        |
    |                        | torque converter stall |    circuit(s) (VSC)    |                        |
    |                        | speed (automatic       |    between the PCM and |                        |
    |                        | transmission) and      |    appropriate control |                        |
    |                        | engine load is high,   |    module.             |                        |
    |                        | it can be inferred     | *  Damaged VSS or      |                        |
    |                        | that the vehicle must  |    TCSS.               |                        |
    |                        | be moving. If there is | *  Damaged wheel speed |                        |
    |                        | insufficient vehicle   |    sensors.            |                        |
    |                        | speed data input, a    | *  Damaged wheel speed |                        |
    |                        | malfunction is         |    sensor harness      |                        |
    |                        | indicated and a DTC is |    circuits.           |                        |
    |                        | set. On most vehicle   | *  Damage in module(s) |                        |
    |                        | applications the       |    connected to VSC    |                        |
    |                        | malfunction indicator  |    /VSS circuit.       |                        |
    |                        | lamp (MIL) will be     | *  Damage drive        |                        |
    |                        | triggered when this    |    mechanism for VSS   |                        |
    |                        | DTC is set.            |    or TCSS.            |                        |
    |________________________|________________________|________________________|________________________|
    | P0500 - Vehicle Speed  | Indicates the          | *  Open in VSS+/VSS-   | Monitor VSS PID while  |
    | Sensor (VSS)           | powertrain control     |    harness circuit     | driving vehicle. This  |
    | Malfunction (MIL       | module (PCM) detected  | *  Short to GND in     | DTC is set when the    |
    | FAULT)                 | an error in the        |    VSS+/VSS- harness   | PCM detects a sudden   |
    |                        | vehicle speed          |    circuit             | loss of VSS signal     |
    |                        | information. Vehicle   | *  Short to PWR in     | over a period of time. |
    |                        | speed data is received |    VSS+/VSS- harness   | Note: Delayed          |
    |                        | from either the        |    circuit             | engagement or no       |
    |                        | vehicle speed sensor   | *  Open or short in    | vehicle movement can   |
    |                        | (VSS), anti-lock brake |    the vehicle speed   | be caused by a         |
    |                        | system (ABS) control   |    circuit(s) (VSC)    | transmission concern.  |
    |                        | module, generic        |    between the PCM and | Harsh shifts and/or    |
    |                        | electronic module      |    appropriate control | erratic speedometer    |
    |                        | (GEM), or central      |    module              | can be caused by a     |
    |                        | timer module (CTM).    | *  Damaged VSS         | failed speedometer or  |
    |                        |                        | *  Damaged wheel speed | an open or             |
    |                        |                        |    sensors             | intermittent ground    |
    |                        |                        | *  Damaged wheel speed | within the instrument  |
    |                        |                        |    sensor harness      | cluster on vehicles    |
    |                        |                        |    circuits            | with electronic        |
    |                        |                        | *  Damage in module(s) | readout.               |
    |                        |                        |    connected to VSC    |                        |
    |                        |                        |    /VSS circuit        |                        |
    |________________________|________________________|________________________|________________________|
    | P0501 - Vehicle Speed  | Indicates the          | *  Refer to possible   | Refer to diagnostic    |
    | Sensor (VSS) Range/    | powertrain control     |    causes for P0500.   | aids for P0500.        |
    | Performance            | module (PCM) detected  |                        |                        |
    |                        | an error in the        |                        |                        |
    |                        | vehicle speed          |                        |                        |
    |                        | information. This DTC  |                        |                        |
    |                        | is set the same way as |                        |                        |
    |                        | P0500, however the     |                        |                        |
    |                        | malfunction indicator  |                        |                        |
    |                        | lamp (MIL) is not      |                        |                        |
    |                        | triggered.             |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0501 - Vehicle Speed  | Indicates the          | Refer to possible      | Refer to diagnostic    |
    | Sensor (VSS) Range/    | powertrain control     | causes for P0500.      | aides for P0500.       |
    | Performance (NON-MIL   | module (PCM) detected  |                        |                        |
    | FAULT)                 | an error in the        |                        |                        |
    |                        | vehicle speed          |                        |                        |
    |                        | information. Vehicle   |                        |                        |
    |                        | speed data is received |                        |                        |
    |                        | from either the        |                        |                        |
    |                        | vehicle speed sensor   |                        |                        |
    |                        | (VSS), anti-lock brake |                        |                        |
    |                        | system (ABS) control   |                        |                        |
    |                        | module, generic        |                        |                        |
    |                        | electronic module      |                        |                        |
    |                        | (GEM), or central      |                        |                        |
    |                        | timer module (CTM).    |                        |                        |
    |                        | This DTC is set the    |                        |                        |
    |                        | same way as P0500,     |                        |                        |
    |                        | however the MIL is not |                        |                        |
    |                        | triggered.             |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0503 - Vehicle Speed  | Indicates poor or      | *  Noisy VSS/TCSS      | Monitor VSS PID while  |
    | Sensor (VSS)           | noisy VSS performance. |    input signal from   | driving vehicle, check |
    | Intermittent           | Vehicle speed data is  |    Radio Frequency     | for intermittent       |
    |                        | received from either   |    Interference        | vehicle speed          |
    |                        | the vehicle speed      |    /Electro- Magnetic  | indication. Verify     |
    |                        | sensor (VSS), transfer |    Interference (RFI   | ignition and charging  |
    |                        | case speed sensor      |    /EMI) external      | system are             |
    |                        | (TCSS), anti-lock      |    sources such as     | functioning.           |
    |                        | brake system (ABS)     |    ignition components |                        |
    |                        | control module,        |    or charging         |                        |
    |                        | generic electronic     |    circuit.            |                        |
    |                        | module (GEM), or       | *  Damaged VSS or      |                        |
    |                        | central timer module   |    driven gears.       |                        |
    |                        | (CTM).                 | *  Damaged TCSS.       |                        |
    |                        |                        | *  Damaged wiring      |                        |
    |                        |                        |    harness or          |                        |
    |                        |                        |    connectors.         |                        |
    |                        |                        | *  Malfunction in      |                        |
    |                        |                        |    module(s) or        |                        |
    |                        |                        |    circuit connected   |                        |
    |                        |                        |    to VSS/TCSS         |                        |
    |                        |                        |    circuit.            |                        |
    |                        |                        | *  After market add    |                        |
    |                        |                        |    -on.                |                        |
    |________________________|________________________|________________________|________________________|
    | P0503 - Vehicle Speed  | Indicates poor or      | *  Noisy VSS input     | Verify ignition and    |
    | Sensor (VSS)           | noisy VSS performance. |    signal from Radio   | charging system are    |
    | Intermittent           |                        |    Frequency           | functioning correctly. |
    |                        |                        |    Interference/       | Check for good VSS (-) |
    |                        |                        |    Electro-Magnetic    | to ground.             |
    |                        |                        |    Interference (RFI   |                        |
    |                        |                        |    /EMI) external      |                        |
    |                        |                        |    sources such as     |                        |
    |                        |                        |    ignition components |                        |
    |                        |                        |    or charging         |                        |
    |                        |                        |    circuit.            |                        |
    |                        |                        | *  Damaged VSS or      |                        |
    |                        |                        |    driven gears.       |                        |
    |                        |                        | *  Damaged wiring      |                        |
    |                        |                        |    harness or          |                        |
    |                        |                        |    connectors.         |                        |
    |                        |                        | *  Malfunction in      |                        |
    |                        |                        |    module(s) or        |                        |
    |                        |                        |    circuit connected   |                        |
    |                        |                        |    to VSS circuit.     |                        |
    |________________________|________________________|________________________|________________________|
    | P0505 - Idle Air       | The PCM attempts to    | *  IAC circuit open    | The IAC solenoid       |
    | Control System         | control engine speed   | *  VPWR to IAC         | resistance is from 6   |
    | Malfunction            | during KOER self-test. |    solenoid open       | to 13 ohms.            |
    |                        | The test fails when    | *  IAC circuit shorted |                        |
    |                        | the desired rpm could  |    to PWR              |                        |
    |                        | not be reached or      | *  Air inlet is        |                        |
    |                        | controlled during the  |    plugged             |                        |
    |                        | self-test.             | *  Damaged IAC valve   |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0552 - Power Steering | The PSP sensor input   | *  PSP sensor damaged  | The DTC indicates the  |
    | Pressure (PSP) Sensor  | signal to the PCM is   | *  SIG RTN circuit     | PSP sensor circuit is  |
    | Circuit Malfunction    | continuously           |    open or shorted     | open or shorted to     |
    |                        | monitored.The test     | *  VREF circuit open   | ground.                |
    |                        | fails when the signal  |    or shorted          |                        |
    |                        | is open or shorted to  | *  PSP sensor signal   |                        |
    |                        | ground.                |    circuit open or     |                        |
    |                        |                        |    shorted             |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|

</PRE>
 

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Re: STICKY ME! DTC Descriptions

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    |          DTC           |      Description       |    Possible Causes     |    Diagnostic Aides    |
    |________________________|________________________|________________________|________________________|
    | P0553 - Power Steering | The PSP sensor input   | *  PSP sensor damaged  | The code indicates the |
    | Pressure (PSP) Sensor  | signal to PCM is       | *  SIG RTN circuit     | PSP sensor circuit is  |
    | Circuit Malfunction    | continuously           |    shorted to power    | shorted to power.      |
    |                        | monitored. The test    | *  VREF circuit        |                        |
    |                        | fails when the signal  |    shorted to power    |                        |
    |                        | is shorted to power.   | *  PSP sensor signal   |                        |
    |                        |                        |    circuit shorted to  |                        |
    |                        |                        |    power               |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0602 - Control Module | This Diagnostic        | *  VID data corrupted  | Using the scan tool,   |
    | Programming Error      | Trouble Code (DTC)     |    by the scan tool    | reprogram the VID      |
    |                        | indicates programming  |    during VID          | block. If PCM does not |
    |                        | error within Vehicle   |    reprogramming       | allow reprogramming of |
    |                        | ID block (VID).        |                        | the VID block,         |
    |                        |                        |                        | reflashing PCM will be |
    |                        |                        |                        | required.              |
    |________________________|________________________|________________________|________________________|
    | P0603 - Powertrain     | Indicates the PCM has  | *  Reprogramming       | If KAPWR is            |
    | Control Module KAM     | experienced an         | *  Battery terminal    | interrupted to the PCM |
    | Test Error             | internal memory fault. |    corrosion           | because of a battery   |
    |                        | However there are      | *  KAPWR to PCM        | or PCM disconnect, DTC |
    |                        | external items that    |    interrupt/open      | can be generated on    |
    |                        | can cause this DTC.    | *  Loose battery       | the first power-up.    |
    |                        |                        |    connection          |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P0703 - Brake Switch   | Indicates PCM did not  | *  Open or short in    | Check for proper       |
    | Circuit Input          | receive a brake pedal  |    BPP circuit         | function of stoplamps. |
    | Malfunction            | position (BPP) input.  | *  Open or short in    | Follow correct Self    |
    |                        |                        |    stoplamp circuits   | -Test procedures,      |
    |                        |                        | *  Damaged PCM         | refer to Section 2 of  |
    |                        |                        | *  Malfunction in      | Quick Test.            |
    |                        |                        |    module(s) connected |                        |
    |                        |                        |    to BPP circuit.     |                        |
    |                        |                        |    (Rear Electronic    |                        |
    |                        |                        |    Module [REM]        |                        |
    |                        |                        |    Windstar and LS6    |                        |
    |                        |                        |    /LS8 or Lighting    |                        |
    |                        |                        |    Control Module      |                        |
    |                        |                        |    (LCM) Continental   |                        |
    |                        |                        |    and Town Car.       |                        |
    |                        |                        | *  Damaged brake       |                        |
    |                        |                        |    switch              |                        |
    |                        |                        | *  Misadjusted brake   |                        |
    |                        |                        |    switch              |                        |
    |________________________|________________________|________________________|________________________|
    | P0704 - Clutch Pedal   | When the clutch pedal  | *  CPP circuit short   | When depressing the    |
    | Position Switch        | is depressed the       |    to PWR              | CPP switch the voltage |
    | Malfunction            | voltage goes to low.   | *  Damaged CPP switch  | should cycle from 5.0V |
    |                        | If the PCM does not    | *  CPP circuit open in | down.                  |
    |                        | see this change from   |    the SIGRTN          |                        |
    |                        | high to low the DTC is | *  Damaged PCM         |                        |
    |                        | set.                   |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0720 - Insufficient   | The output shaft speed | *  OSS sensor circuit  | Verify sensor signal   |
    | input from Output      | sensor inputs a signal |    short to GND        | output varies with     |
    | Shaft Speed sensor     | to the PCM, based on   | *  OSS sensor circuit  | vehicle speed.         |
    |                        | the speed of the       |    short to PWR        |                        |
    |                        | output shaft of the    | *  OSS sensor circuit  |                        |
    |                        | transmission. The PCM  |    open                |                        |
    |                        | compares this signal   | *  Damaged OSS sensor  |                        |
    |                        | with the signal of the | *  Damaged PCM         |                        |
    |                        | VSS or TCSS and        |                        |                        |
    |                        | determines correct     |                        |                        |
    |                        | tire size and axle     |                        |                        |
    |                        | gear ratio.            |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P0721 - Noise          | The output shaft speed | *  Wiring misrouted    | -  Check routing of    |
    | interference on Output | sensor signal is very  | *  After market add-on |    harness.            |
    | Shaft Speed sensor     | sensitive to noise.    | *  Wiring damaged      | -  Check wiring and    |
    | signal                 | This noise distorts    | *  Wiring insulation   |    connector for       |
    |                        | the input to the PCM.  |    wear                |    damage.             |
    |________________________|________________________|________________________|________________________|
    | P0722 - No signal from | The output shaft speed | *  Damaged OSS         |                        |
    | Output Shaft Speed     | sensor failed to       |    connector           |                        |
    | sensor                 | provide a signal to    | *  Damaged OSS sensor, |                        |
    |                        | the PCM upon initial   |    or not installed    |                        |
    |                        | movement of vehicle.   |    properly            |                        |
    |                        |                        | *  Harness             |                        |
    |                        |                        |    intermittently      |                        |
    |                        |                        |    shorted or open     |                        |
    |________________________|________________________|________________________|________________________|
    | P0723 - Output Shaft   | The output shaft speed | *  Harness connector   | -  Verify harness and  |
    | Speed sensor circuit   | sensor signal to the   |    not properly seated |    connector integrity |
    | intermittent failure   | PCM is irregular or    | *  Harness             | -  Verify OSS sensor   |
    |                        | interrupted.           |    intermittently      |    proper installation |
    |                        |                        |    shorted, or open    |                        |
    |                        |                        | *  Harness connector   |                        |
    |                        |                        |    damaged             |                        |
    |                        |                        | *  OSS sensor damaged, |                        |
    |                        |                        |    or not installed    |                        |
    |                        |                        |    properly            |                        |
    |________________________|________________________|________________________|________________________|
    | P0812 - Reverse Switch | The DTC indicates that | *  Transmission shift  | Check RS PID while     |
    | (RS) input circuit     | the voltage is high    |    not indicating      | exercising shift lever |
    | malfunction            | when it should be low. |    neutral while in    | in and out of reverse. |
    |                        |                        |    KOEO Self-Test      |                        |
    |                        |                        | *  RS circuit short to |                        |
    |                        |                        |    PWR                 |                        |
    |                        |                        | *  Damaged reverse     |                        |
    |                        |                        |    switch              |                        |
    |                        |                        | *  RS circuit open or  |                        |
    |                        |                        |    short to SIGRTN     |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P1000 - Monitor        | The on board           | *  Vehicle is new from | The DTC does not need  |
    | Testing Not Complete   | diagnostic II (OBD II) |    the factory         | to be cleared from the |
    |                        | monitors are performed | *  Battery or PCM had  | PCM except to pass an  |
    |                        | during the OBD II      |    recently been       | inspection/maintenance |
    |                        | Drive Cycle. The DTC   |    disconnected        | test.                  |
    |                        | will be stored in      | *  An OBD II monitor   |                        |
    |                        | continuous memory if   |    failure had         |                        |
    |                        | any of the OBD II      |    occurred before     |                        |
    |                        | monitors do not        |    completion of an    |                        |
    |                        | complete.              |    OBD II drive cycle  |                        |
    |                        |                        | *  PCM DTCs have       |                        |
    |                        |                        |    recently been       |                        |
    |                        |                        |    cleared with a scan |                        |
    |                        |                        |    tool                |                        |
    |                        |                        | *  PTO circuit is      |                        |
    |                        |                        |    shorted to VPWR or  |                        |
    |                        |                        |    B+ or PTO is on     |                        |
    |                        |                        |    during testing      |                        |
    |________________________|________________________|________________________|________________________|
    | P1001 - KOER Not Able  | This Non-MIL           | *  Incorrect Self-Test | Rerun Self-Test        |
    | To Complete, KOER      | (Malfunction Indicator |    Procedure.          | following QT1 in       |
    | Aborted                | Lamp) code will be set | *  Unexpected response | Section 3, Symptom     |
    |                        | when Key On Engine     |    from Self-Test      | Charts, STEP 1: PCM    |
    |                        | Running (KOER) Self    |    monitors.           | Quick Test.            |
    |                        | -Test does not         | *  rpm out of          |                        |
    |                        | complete in the time   |    specification.      |                        |
    |                        | intended.              |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1100 - Mass Air Flow  | The MAF sensor circuit | *  Poor continuity     | While accessing the    |
    | (MAF) Sensor           | is monitored by the    |    through the MAF     | MAF V PID on the scan  |
    | Intermittent           | PCM for sudden voltage |    sensor connectors   | tool, lightly tap on   |
    |                        | (or air flow) input    | *  Poor continuity     | the MAF sensor or      |
    |                        | change through the     |    through the MAF     | wiggle the MAF sensor  |
    |                        | comprehensive          |    sensor harness      | connector and harness. |
    |                        | component monitor      | *  Intermittent open   | If the MAF V PID       |
    |                        | (CCM). If during the   |    or short inside the | suddenly changes below |
    |                        | last 40 warm-up cycles |    MAF sensor.         | 0.23 volt or above     |
    |                        | in key ON engine       |                        | 4.60 volts, an         |
    |                        | running the PCM        |                        | intermittent fault is  |
    |                        | detects a voltage (or  |                        | indicated.             |
    |                        | air flow) change       |                        |                        |
    |                        | beyond the minimum or  |                        |                        |
    |                        | maximum calibrated     |                        |                        |
    |                        | limit, a continuous    |                        |                        |
    |                        | memory diagnostic      |                        |                        |
    |                        | trouble code (DTC) is  |                        |                        |
    |                        | stored.                |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1101 - Mass Air Flow  | The MAF sensor circuit | *  Low battery charge  | A MAF V PID reading    |
    | (MAF) Sensor Out of    | is monitored by the    | *  MAF sensor          | greater than 0.27      |
    | Self-Test Range        | PCM for an out of      |    partially connected | volts (KOEO) or a MAF  |
    |                        | range air flow (or     | *  MAF sensor          | V PID reading outside  |
    |                        | voltage) input. If     |    contamination       | the 0.46 volt to 2.44  |
    |                        | during key ON engine   | *  PWR GND open to MAF | volts range (KOER)     |
    |                        | OFF the air flow (or   |    sensor              | indicates a hard       |
    |                        | voltage) reading is    | *  MAF RTN circuit     | fault.                 |
    |                        | greater than (grams    |    open to PCM         |                        |
    |                        | /second equivalent     | *  Damaged MAF sensor  |                        |
    |                        | chart in pinpoint test | *  Damaged PCM         |                        |
    |                        | DC [0.27 volt]), the   |                        |                        |
    |                        | test fails. Likewise,  |                        |                        |
    |                        | if during key ON       |                        |                        |
    |                        | engine running an air  |                        |                        |
    |                        | flow (or voltage)      |                        |                        |
    |                        | reading is not within  |                        |                        |
    |                        | (gram/second           |                        |                        |
    |                        | equivalent chart in    |                        |                        |
    |                        | pinpoint test DC [0.46 |                        |                        |
    |                        | volt to 2.44 volts]),  |                        |                        |
    |                        | the test fails.        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1109 - Intake Air     | Indicates IAT2 circuit | *  Damaged harness     | Monitor IAT2 on scan   |
    | Temperature 2 Sensor   | became intermittently  | *  Damaged sensor      | tool, look for sudden  |
    | Intermittent           | open or shorted while  | *  Damaged harness     | changes in reading     |
    |                        | engine was running.    |    connector           | when harness is        |
    |                        |                        | *  Damaged PCM         | wiggled or sensor is   |
    |                        |                        |                        | tapped.                |
    |________________________|________________________|________________________|________________________|
    | P1112 - Intake Air     | Indicates IAT sensor   | *  Damaged harness     | Monitor IAT on scan    |
    | Temperature (IAT)      | signal was             | *  Damaged sensor      | tool, look for sudden  |
    | Sensor Intermittent    | intermittent during    | *  Damaged harness     | changes in reading     |
    |                        | the comprehensive      |    connector           | when harness is        |
    |                        | component monitor.     | *  Damaged PCM         | wiggled or sensor is   |
    |                        |                        |                        | tapped.                |
    |________________________|________________________|________________________|________________________|
    | P1114 - Intake Air     | Indicates the sensor   | *  Grounded circuit in | Using signal           |
    | Temperature 2 Circuit  | signal is less than    |    harness             | simulation, disconnect |
    | Low Input              | Self-Test minimum. The | *  Improper harness    | sensor and simulate    |
    |                        | IAT2 sensor minimum is |    connection          | 1.0V on sensor signal  |
    |                        | 0.2 volts or 121øC     | *  Damaged sensor      | circuit. Simulated     |
    |                        | (250øF).               | *  Damaged PCM         | 1.0V signal and scan   |
    |                        |                        |                        | PID voltage value      |
    |                        |                        |                        | should be similar. If  |
    |                        |                        |                        | voltage is similar     |
    |                        |                        |                        | check sensor, if       |
    |                        |                        |                        | voltage is not similar |
    |                        |                        |                        | check related circuit  |
    |                        |                        |                        | and PCM.               |
    |________________________|________________________|________________________|________________________|
    | P1115 - Intake Air     | Indicates the sensor   | *  Open circuit in     | Using signal           |
    | Temperature 2 Circuit  | signal is greater than |    harness             | simulation, disconnect |
    | High Input             | Self-Test maximum. The | *  Sensor signal short | sensor and simulate    |
    |                        | IAT2 sensor maximum is |    to power            | 1.0V on sensor signal  |
    |                        | 4.6 volts or -50øC (   | *  Damaged PCM         | circuit. Simulated     |
    |                        | -46øF).                | *  Improper harness    | 1.0V signal and scan   |
    |                        |                        |    connection          | PID voltage value      |
    |                        |                        | *  Damaged sensor      | should be similar. If  |
    |                        |                        |                        | voltage is similar     |
    |                        |                        |                        | check sensor, if       |
    |                        |                        |                        | voltage is not similar |
    |                        |                        |                        | check related circuit  |
    |                        |                        |                        | and PCM.               |
    |________________________|________________________|________________________|________________________|
    | P1116 - Engine Coolant | Indicates the ECT      | *  Overheating         | Engine coolant         |
    | Temperature (ECT)      | sensor is out of Self  |    condition           | temperature must be    |
    | Sensor Out of Self     | -Test range. Correct   | *  Malfunctioning      | greater than 10øC      |
    | -Test Range            | range is 0.3 to 3.7    |    thermostat          | (50øF) to pass the     |
    |                        | volts.                 | *  Damaged ECT sensor  | KOEO Self-Test and     |
    |                        |                        | *  Low engine coolant  | greater than 82øC      |
    |                        |                        | *  Damaged harness     | (180øF) to pass the    |
    |                        |                        |    connector           | KOER Self-Test.        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P1117 - Engine Coolant | Indicates ECT circuit  | *  Damaged harness     | -  Monitor ECT on scan |
    | Temperature (ECT)      | became intermittently  | *  Damaged sensor      |    tool, look for      |
    | Sensor Intermittent    | open or shorted while  | *  Damaged PCM         |    sudden changes in   |
    |                        | engine was running.    | *  Damaged harness     |    reading when        |
    |                        |                        |    connector           |    harness is wiggled  |
    |                        |                        | *  Low engine coolant  |    or sensor is        |
    |                        |                        |                        |    tapped.             |
    |                        |                        |                        |   *  TP circuit        |
    |                        |                        |                        |      intermittent open |
    |                        |                        |                        |   *  Damaged TP sensor |
    |                        |                        |                        |   *  Damaged PCM       |
    |________________________|________________________|________________________|________________________|
    | P1120 - Throttle       | The TP sensor circuit  | *  TP circuit with     | A TP PID (TP V PID)    |
    | Position (TP) Sensor   | is monitored by the    |    frayed wires        | between 3.42 and 9.85% |
    | Out of Range Low       | PCM for a low TP       | *  Corrosion on TP     | (0.17 and 0.49 volt)   |
    | (RATCH too Low)        | rotation angle (or     |    circuit connectors  | in key ON engine OFF,  |
    |                        | voltage) input below   | *  VREF open to TP     | continuous memory or   |
    |                        | the closed throttle    |    sensor              | key ON engine running  |
    |                        | position through the   | *  VREF short to SIG   | indicates a hard       |
    |                        | comprehensive          |    RTN                 | fault.                 |
    |                        | component monitor      | *  TP sensor loose     |                        |
    |                        | (CCM). If during key   |    pins                |                        |
    |                        | ON engine OFF or key   |                        |                        |
    |                        | ON engine running the  |                        |                        |
    |                        | TP rotation angle (or  |                        |                        |
    |                        | voltage) remains       |                        |                        |
    |                        | within the calibrated  |                        |                        |
    |                        | self-test range but    |                        |                        |
    |                        | falls between 3.42 and |                        |                        |
    |                        | 9.85% (0.17 and 0.49   |                        |                        |
    |                        | volt), the test fails. |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1121 - Throttle       | The PCM monitors a     | *  Air leak between    | Drive vehicle and      |
    | Position (TP) Sensor   | vehicle operation      |    MAF sensor and      | exercise throttle and  |
    | Inconsistent with MAF  | rationality check by   |    throttle body       | TP sensor in all       |
    | Sensor                 | comparing sensed       | *  TP sensor not       | gears. A TP PID (TP V  |
    |                        | throttle position to   |    seated properly     | PID) less than 4.82 %  |
    |                        | mass air flow          | *  Damaged TP sensor   | (0.24 volt) with a     |
    |                        | readings. If during    | *  Damaged MAF sensor  | LOAD PID greater than  |
    |                        | key ON engine running  |                        | 55% or a TP V PID      |
    |                        | self-test the          |                        | greater than 49.05%    |
    |                        | comparison of the TP   |                        | (2.44 volts) with a    |
    |                        | sensor and MAF sensor  |                        | LOAD PID less than 30% |
    |                        | readings are not       |                        | indicates a hard       |
    |                        | consistent with        |                        | fault.                 |
    |                        | calibrated load values |                        |                        |
    |                        | , the test fails and a |                        |                        |
    |                        | diagnostic trouble     |                        |                        |
    |                        | code is stored in      |                        |                        |
    |                        | continuous memory.     |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1124 - Throttle       | The TP sensor circuit  | *  Binding or bent     | A TP PID (TP V PID)    |
    | Position (TP) Sensor   | is monitored by the    |    throttle linkage    | reading not between    |
    | Out of Self-Test Range | PCM for an out of      | *  TP sensor not       | 13.27 and 23.52% (0.66 |
    |                        | range TP rotation      |    seated properly     | and 1.17 volts) in key |
    |                        | angle (or voltage)     | *  Throttle plate      | ON engine OFF or key   |
    |                        | input. If during key   |    below closed        | ON engine running      |
    |                        | ON engine OFF or key   |    throttle position   | indicates a hard       |
    |                        | ON engine running the  | *  Throttle plate      | fault.                 |
    |                        | TP rotation angle (or  |    /screw misadjusted  |                        |
    |                        | voltage) reading is    | *  Damaged TP sensor   |                        |
    |                        | less than 13.27% (0.66 | *  Damaged PCM         |                        |
    |                        | volt) or greater than  |                        |                        |
    |                        | 23.52% (1.17 volts),   |                        |                        |
    |                        | the test fails.        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1125 - Throttle       | The TP sensor circuit  | *  Poor continuity     | While accessing the TP |
    | Position (TP) Sensor   | is monitored by the    |    through the TP      | V PID on the scan tool |
    | Intermittent           | PCM for sudden TP      |    sensor connectors   | , lightly tap on the   |
    |                        | rotation angle (or     | *  Poor continuity     | TP sensor or wiggle    |
    |                        | voltage) input change  |    through the TP      | the TP sensor          |
    |                        | through the            |    harness             | connector and harness. |
    |                        | comprehensive          | *  Intermittent open   | If the TP V PID        |
    |                        | component monitor      |    or short inside the | suddenly changes below |
    |                        | (CCM). If during the   |    TP sensor           | 0.49 volt or above     |
    |                        | last 80 warm-up cycles |                        | 4.65 volts, an         |
    |                        | in key ON engine       |                        | intermittent fault is  |
    |                        | running the PCM        |                        | indicated.             |
    |                        | detects a TP rotation  |                        |                        |
    |                        | angle (or voltage)     |                        |                        |
    |                        | changes beyond the     |                        |                        |
    |                        | minimum or maximum     |                        |                        |
    |                        | calibrated limit, a    |                        |                        |
    |                        | continuous diagnostic  |                        |                        |
    |                        | trouble code (DTC) is  |                        |                        |
    |                        | stored.                |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1127 - Exhaust Not    | The HEGO monitor uses  | *  Engine not          | Monitor HO2S Heater    |
    | Warm Enough,           | an exhaust temperature |    operating long      | PIDs to determine      |
    | Downstream Sensor Not  | model to determine     |    enough prior to     | their ON/OFF state.    |
    | Tested                 | when the HO2S heaters  |    performing KOER     | DTC P1127 will be      |
    |                        | are cycled ON. The     |    self-test.          | present if the exhaust |
    |                        | test fails when the    | *  Exhaust system too  | is not hot.            |
    |                        | inferred exhaust       |    cool.               |                        |
    |                        | temperature is below a |                        |                        |
    |                        | minimum calibrated     |                        |                        |
    |                        | value.                 |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1128 - Upstream       | The HEGO monitor       | *  Crossed HO2S        |                        |
    | Oxygen Sensors Swapped | checks and determines  |    harness connectors  |                        |
    | from Bank to Bank      | if the HO2S signal     |    (upstream).         |                        |
    | (HO2S-11-21)           | response for a fuel    | *  Crossed HO2S wiring |                        |
    |                        | shift corresponds to   |    at the harness      |                        |
    |                        | the correct engine     |    connectors          |                        |
    |                        | bank. The test fails   |    (upstream).         |                        |
    |                        | when a response from   | *  Crossed HO2S wiring |                        |
    |                        | the HO2S(s) being      |    at the 104-pin      |                        |
    |                        | tested is not          |    harness connectors  |                        |
    |                        | indicated.             |    (upstream).         |                        |
    |________________________|________________________|________________________|________________________|
    | P1129 - Downstream     | The HEGO monitor       | *  Crossed HO2S        |                        |
    | Oxygen Sensors Swapped | checks and determines  |    harness connectors  |                        |
    | from Bank to Bank      | if the HO2S signal     |    (downstream).       |                        |
    | (HO2S-12-22)           | response for a fuel    | *  Crossed HO2S wiring |                        |
    |                        | shift corresponds to   |    at the harness      |                        |
    |                        | the correct engine     |    connectors          |                        |
    |                        | bank. The test fails   |    (downstream).       |                        |
    |                        | when a response from   | *  Crossed HO2S wiring |                        |
    |                        | the HO2S(s) being      |    at the 104-pin      |                        |
    |                        | tested is not          |    harness connectors  |                        |
    |                        | indicated.             |    (downstream).       |                        |
    |________________________|________________________|________________________|________________________|
    | P1130 - Lack of HO2S   | The HEGO Sensor is     |    Electrical:         | A fuel control HO2S    |
    | -11 Switch, Fuel Trim  | monitored for          |   *  Short to VPWR in  | PID switching across   |
    | at Limit               | switching. The test    |      harness or HO2S   | 0.45 volt from 0.2 to  |
    |                        | fails when the HO2S    |   *  Water in harness  | 0.9 volt indicates a   |
    |                        | fails to switch due to |      connector         | normal switching HO2S. |
    |                        | circuit or fuel at or  |   *  Open/Shorted HO2S |                        |
    |                        | exceeding a calibrated |      circuit           |                        |
    |                        | limit.                 |   *  Corrosion or poor |                        |
    |                        |                        |      mating terminals  |                        |
    |                        |                        |      and wiring        |                        |
    |                        |                        |   *  Damaged HO2S      |                        |
    |                        |                        |   *  Damaged PCM       |                        |
    |                        |                        |    Fuel System:        |                        |
    |                        |                        |   *  Excessive fuel    |                        |
    |                        |                        |      pressure          |                        |
    |                        |                        |   *  Leaking           |                        |
    |                        |                        |      /contaminated     |                        |
    |                        |                        |      fuel injectors    |                        |
    |                        |                        |   *  Leaking fuel      |                        |
    |                        |                        |      pressure          |                        |
    |                        |                        |      regulator         |                        |
    |                        |                        |   *  Low fuel pressure |                        |
    |                        |                        |      or running out of |                        |
    |                        |                        |      fuel              |                        |
    |                        |                        |   *  Vapor recovery    |                        |
    |                        |                        |      system            |                        |
    |                        |                        |    Induction System:   |                        |
    |                        |                        |   *  Air leaks after   |                        |
    |                        |                        |      the MAF           |                        |
    |                        |                        |   *  Vacuum Leaks      |                        |
    |                        |                        |   *  PCV system        |                        |
    |                        |                        |   *  Improperly seated |                        |
    |                        |                        |      engine oil        |                        |
    |                        |                        |      dipstick          |                        |
    |                        |                        |    EGR System:         |                        |
    |                        |                        |   *  Leaking gasket    |                        |
    |                        |                        |   *  Stuck EGR valve   |                        |
    |                        |                        |   *  Leaking diaphragm |                        |
    |                        |                        |      or EVR            |                        |
    |                        |                        |    Base Engine:        |                        |
    |                        |                        |   *  Oil overfill      |                        |
    |                        |                        |   *  Cam timing        |                        |
    |                        |                        |   *  Cylinder          |                        |
    |                        |                        |      compression       |                        |
    |                        |                        |   *  Exhaust leaks     |                        |
    |                        |                        |      before or near    |                        |
    |                        |                        |      the HO2S(s)       |                        |
    |________________________|________________________|________________________|________________________|
    | P1131 - Lack of HO2S   | A HEGO sensor          | See Possible Causes    |                        |
    | -11 Switch, Sensor     | indicating lean at the | for DTC P1130          |                        |
    | Indicates Lean         | end of a test is       |                        |                        |
    |                        | trying to correct for  |                        |                        |
    |                        | an over-rich           |                        |                        |
    |                        | condition. The test    |                        |                        |
    |                        | fails when the fuel    |                        |                        |
    |                        | control system no      |                        |                        |
    |                        | longer detects         |                        |                        |
    |                        | switching for a        |                        |                        |
    |                        | calibrated amount of   |                        |                        |
    |                        | time.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1132 - Lack of HO2S   | A HEGO sensor          | See Possible Causes    |                        |
    | -11 Switch, Sensor     | indicating rich at the | for DTC P1130          |                        |
    | Indicates Rich         | end of a test is       |                        |                        |
    |                        | trying to correct for  |                        |                        |
    |                        | an over-lean           |                        |                        |
    |                        | condition. The test    |                        |                        |
    |                        | fails when the fuel    |                        |                        |
    |                        | control system no      |                        |                        |
    |                        | longer detects         |                        |                        |
    |                        | switching for a        |                        |                        |
    |                        | calibrated amount of   |                        |                        |
    |                        | time.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1137 - Lack of HO2S   | The downstream HO2S    | *  Pinched, shorted,   |                        |
    | -12 Switch, Sensor     | sensors are forced     |    and corroded wiring |                        |
    | Indicates Lean         | rich and lean and      |    and pins            |                        |
    |                        | monitored by the PCM.  | *  Crossed sensor      |                        |
    |                        | The test fails if the  |    wires               |                        |
    |                        | PCM does not detect    | *  Exhaust leaks       |                        |
    |                        | the output of the HO2S | *  Contaminated or     |                        |
    |                        | in a calibrated amount |    damaged sensor      |                        |
    |                        | of time.               |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1138 - Lack of HO2S   | See DTC P1137          |                        |                        |
    | -12 Switch, Sensor     |                        |                        |                        |
    | Indicates Rich         |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1150 - Lack of HO2S   | See DTC P1130          |                        |                        |
    | -21 Switch, Fuel Trim  |                        |                        |                        |
    | at Limit               |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1151 - Lack of HO2S   | A HEGO sensor          | See Possible Causes    |                        |
    | -21 Switch, Sensor     | indicating lean at the | for DTC P1130          |                        |
    | Indicates Lean         | end of a test is       |                        |                        |
    |                        | trying to correct for  |                        |                        |
    |                        | an over-rich           |                        |                        |
    |                        | condition. The test    |                        |                        |
    |                        | fails when fuel        |                        |                        |
    |                        | control system no      |                        |                        |
    |                        | longer detects         |                        |                        |
    |                        | switching for a        |                        |                        |
    |                        | calibrated amount of   |                        |                        |
    |                        | time.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1152 - Lack of HO2S   | A HEGO sensor          | See Possible Causes    |                        |
    | -21 Switch, Sensor     | indicating rich at the | for DTC P1130          |                        |
    | Indicates Rich         | end of a test is       |                        |                        |
    |                        | trying to correct for  |                        |                        |
    |                        | an over-lean           |                        |                        |
    |                        | condition. The test    |                        |                        |
    |                        | fails when the fuel    |                        |                        |
    |                        | control system no      |                        |                        |
    |                        | longer detects         |                        |                        |
    |                        | switching for a        |                        |                        |
    |                        | calibrated amount of   |                        |                        |
    |                        | time.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1157 - Lack of HO2S   | See DTC P1137          |                        |                        |
    | -22 Switch, Sensor     |                        |                        |                        |
    | Indicates Lean         |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1158 - Lack of HO2S   | See DTC P1137          |                        |                        |
    | -22 Switch, Sensor     |                        |                        |                        |
    | Indicates Rich         |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1168 - Fuel Rail      | The comprehensive      | *  Low fuel pressure   |    A FRP PID value     |
    | Pressure Sensor in     | component monitor      | *  Damaged FRP sensor  |    below 551 kpa (80   |
    | Range But Low          | (CCM) monitors the FRP | *  Excessive           |    psi) indicates a    |
    |                        | pressure for           |    resistance in       |    failure             |
    |                        | acceptable fuel        |    circuit             |   *  Low or no fuel    |
    |                        | pressure. The test     | *  Low or no fuel      |    A FRP PID value     |
    |                        | fails when the fuel    |                        |    greater than 896    |
    |                        | pressure falls below a |                        |    kpa (130 psi)       |
    |                        | calibrated value.      |                        |    indicates a failure |
    |________________________|________________________|________________________|________________________|
    | P1169 - Fuel Rail      | The comprehensive      | *  High fuel pressure  |                        |
    | Pressure (FRP) Sensor  | component monitor      | *  Low fuel pressure   |                        |
    | in Range But High      | (CCM) monitors the FRP | *  Damaged FRP sensor  |                        |
    |                        | pressure for           | *  Excessive           |                        |
    |                        | acceptable fuel        |    resistance in       |                        |
    |                        | pressure. The test     |    circuit             |                        |
    |                        | fails when the fuel    |                        |                        |
    |                        | pressure falls below   |                        |                        |
    |                        | or exceeds a minimum   |                        |                        |
    |                        | /maximum calibrated    |                        |                        |
    |                        | value for a calibrated |                        |                        |
    |                        | period of time.        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1180 - Fuel Delivery  | The PCM receives fuel  | *  Restriction in the  |                        |
    | System - Low           | tank pressure (FTP)    |    fuel line           |                        |
    |                        | information from the   | *  Plugged fuel filter |                        |
    |                        | natural gas module     |                        |                        |
    |                        | (NG), which uses the   |                        |                        |
    |                        | information to infer   |                        |                        |
    |                        | fuel rail pressure     |                        |                        |
    |                        | (FRP). The test fails  |                        |                        |
    |                        | when the inferred      |                        |                        |
    |                        | pressure is less than  |                        |                        |
    |                        | a minimum calibrated   |                        |                        |
    |                        | value.                 |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1181 - Fuel Delivery  | The PCM receives fuel  | *  Fuel pressure       |                        |
    | System - High          | tank pressure (FTP)    |    regulator           |                        |
    |                        | information from the   |                        |                        |
    |                        | natural gas module     |                        |                        |
    |                        | (NG), which uses the   |                        |                        |
    |                        | information to infer   |                        |                        |
    |                        | fuel rail pressure     |                        |                        |
    |                        | (FRP). The test fails  |                        |                        |
    |                        | when the inferred      |                        |                        |
    |                        | pressure is higher     |                        |                        |
    |                        | than a maximum         |                        |                        |
    |                        | calibrated value.      |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1183 - Engine Oil     | Indicates EOT circuit  | *  Damaged harness     | Using signal           |
    | Temperature (EOT)      | became intermittently  | *  Damaged sensor      | simulation, disconnect |
    | Sensor Circuit         | open or shorted while  | *  Damaged harness     | sensor and simulate    |
    | Malfunction            | engine was running.    |    connector           | 1.0V on sensor signal  |
    |                        |                        | *  Damaged PCM         | circuit. Simulated     |
    |                        |                        |                        | 1.0V signal and scan   |
    |                        |                        |                        | PID voltage value      |
    |                        |                        |                        | should be similar. If  |
    |                        |                        |                        | voltage is similar     |
    |                        |                        |                        | check sensor, if       |
    |                        |                        |                        | voltage is not similar |
    |                        |                        |                        | check related circuit  |
    |                        |                        |                        | and PCM.               |
    |________________________|________________________|________________________|________________________|

</PRE>
 

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Re: STICKY ME! DTC Descriptions

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<pre>
    |          DTC           |      Description       |    Possible Causes     |    Diagnostic Aides    |
    |________________________|________________________|________________________|________________________|
    | P1184 - Engine Oil     | Indicates EOT signal   | *  Damaged harness     | Using signal           |
    | Temperature (EOT)      | was out of Self-Test   | *  Damaged sensor      | simulation, disconnect |
    | Sensor Out of Self     | range. Correct range   | *  Damaged harness     | sensor and simulate    |
    | -Test Range            | for KOER is.3-1.2      |    connector           | 1.0V on sensor signal  |
    |                        | volts.                 | *  Damaged PCM         | circuit. Simulated     |
    |                        |                        |                        | 1.0V signal and scan   |
    |                        |                        |                        | PID voltage value      |
    |                        |                        |                        | should be similar. If  |
    |                        |                        |                        | voltage is similar     |
    |                        |                        |                        | check sensor, if       |
    |                        |                        |                        | voltage is not similar |
    |                        |                        |                        | check related circuit  |
    |                        |                        |                        | and PCM.               |
    |________________________|________________________|________________________|________________________|
    | P1229 - Supercharger   | The ICP DTC will be    | *  Pump motor open     | Check for voltage at   |
    | Intercooler Pump (ICP) | set when the PCM is    |    circuited           | relay, check fuse in   |
    | Pump Not Operating     | calling for the pump   | *  Pump relay coil     | power feed, check      |
    |                        | to be operating but no |    open                | ground connection of   |
    |                        | current is being       | *  Open circuit        | pump motor, PID        |
    |                        | detected.              |    between relay and   | reading is on/off.     |
    |                        |                        |    pump                |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |                        |                        | *  Pump motor shorted  |                        |
    |                        |                        | *  Open circuit        |                        |
    |                        |                        |    between PCM and     |                        |
    |                        |                        |    relay               |                        |
    |                        |                        | *  Poor pump ground    |                        |
    |                        |                        |    connection          |                        |
    |________________________|________________________|________________________|________________________|
    | P1232 - Low Speed Fuel | Monitors the low speed | *  Open or shorted low | -  An open circuit or  |
    | Pump Primary Circuit   | fuel pump (LFP)        |    fuel pump (LFP)     |    short to ground can |
    | Malfunction            | primary circuit output |    circuit             |    only be detected    |
    |                        | from the PCM. The test | *  Open VPWR to low    |    with the low speed  |
    |                        | fails if: When the LFP |    speed fuel pump     |    fuel pump.          |
    |                        | circuit is commanded   |    relay               | -  A short to power    |
    |                        | on (grounded),         | *  Damaged low speed   |    can only be         |
    |                        | excessive current draw |    fuel pump relay     |    detected with the   |
    |                        | is detected on the LFP | *  Damaged PCM         |    low speed fuel pump |
    |                        | circuit; or when the   |                        |    commanded on.       |
    |                        | LFP circuit is         |                        | -  During KOEO and     |
    |                        | commanded off, voltage |                        |    KOER Self-Test, the |
    |                        | is not detected on the |                        |    low speed fuel pump |
    |                        | LFP circuit (the PCM   |                        |    output command will |
    |                        | expects to detect VPWR |                        |    be cycled on and    |
    |                        | voltage coming through |                        |    off.                |
    |                        | the low speed fuel     |                        |                        |
    |                        | pump relay coil to the |                        |                        |
    |                        | LFP circuit).          |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1233 - Fuel System    | Note: For LS6/LS8,     | *  Inertia fuel        | The PCM expects to see |
    | Disabled or Offline    | P1233 indicates the    |    shutoff (IFS)       | one of the following   |
    |                        | PCM is not receiving   |    switch needs to be  | duty cycle signals     |
    |                        | the fuel level         |    reset               | from the FPDM on the   |
    |                        | information on SCP     | *  Open FPDM ground    | FPM circuit: 1) 50%    |
    |                        | from the rear          |    circuit             | (500 msec on, 500 msec |
    |                        | electronics module     | *  Open or shorted FPM | off), all OK. 2) 25%   |
    |                        | (REM). Refer to the    |    circuit             | (250 msec on, 750 msec |
    |                        | Workshop Manual        | *  Damaged IFS switch  | off), FPDM did not     |
    |                        | Section 413-01 for     | *  Damaged FPDM        | receive a fuel pump    |
    |                        | diagnostics. Monitors  | *  Damaged PCM         | (FP) duty cycle        |
    |                        | the fuel pump monitor  | *  Also for Escort     | command from the PCM,  |
    |                        | (FPM) circuit from the |    /Tracer and Mustang | or the duty cycle that |
    |                        | fuel pump driver       |   -  Open FPDM PWR     | was received was       |
    |                        | module (FPDM). With    |      circuit           | invalid. 3) 75% (750   |
    |                        | the key on, the FPDM   |   -  Open B+ circuit   | msec ON, 250 OFF), the |
    |                        | continuously sends a   |      to constant       | FPDM has detected a    |
    |                        | duty cycle signal to   |      control relay     | fault in the circuits  |
    |                        | the PCM through the    |      module (CCRM) pin | between the FPDM and   |
    |                        | FPM circuit. The test  |      11                | the fuel pump.         |
    |                        | fails if the PCM stops |   -  Open ground to    |                        |
    |                        | receiving the duty     |      CCRM pin 18       |                        |
    |                        | cycle signal.          |      (Mustang)         |                        |
    |                        |                        |   -  Damaged CCRM      |                        |
    |                        |                        | *   Also for           |                        |
    |                        |                        |    Continental:        |                        |
    |                        |                        |   -  Open VPWR circuit |                        |
    |                        |                        |      to FPDM           |                        |
    |________________________|________________________|________________________|________________________|
    | P1234 - Fuel System    | See DTC P1233. P1234   |                        |                        |
    | Disabled or Offline    | is identical to P1233  |                        |                        |
    |                        | except P1234 will not  |                        |                        |
    |                        | illuminate the MIL.    |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1235 - Fuel Pump      | Note: For LS6/LS8, the | *  FP circuit open or  | The FPDM sends a 25%   |
    | Control Out Of Range   | FPDM functions are     |    shorted             | duty cycle (250 msec   |
    |                        | incorporated in the    | *  Damaged FPDM.       | ON, 750 msec OFF)      |
    |                        | Rear Electronics       | *  Damaged PCM         | through the FPM        |
    |                        | Module (REM). Also,    |                        | circuit to the PCM     |
    |                        | the REM does not use a |                        | while the fault is     |
    |                        | FPM circuit.           |                        | being detected by the  |
    |                        | Diagnostic information |                        | FPDM. If the fault is  |
    |                        | will be sent through   |                        | no longer detected,    |
    |                        | SCP. Indicates that    |                        | the PDM will return to |
    |                        | the FPDM has detected  |                        | sending an "all OK"    |
    |                        | an invalid or missing  |                        | (50% duty cycle)       |
    |                        | FP circuit signal from |                        | message to the PCM.    |
    |                        | the PCM. The FPDM will |                        | The PCM will keep      |
    |                        | send a message to the  |                        | P1235 stored in        |
    |                        | PCM through the FPM    |                        | Continuous Memory.     |
    |                        | circuit, indicating    |                        |                        |
    |                        | that this failure has  |                        |                        |
    |                        | been detected. The PCM |                        |                        |
    |                        | will set the DTC when  |                        |                        |
    |                        | the message is         |                        |                        |
    |                        | received.              |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1236 - Fuel Pump      | See DTC P1235. P1236   |                        |                        |
    | Control Out Of Range   | is identical to P1235  |                        |                        |
    |                        | except P1236 will not  |                        |                        |
    |                        | illuminate the MIL.    |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1237 - Fuel Pump      | Note: For LS6/LS8, the | *  Open or shorted FP  | -  The FPDM sends a    |
    | Secondary Circuit      | FPDM functions are     |    PWR circuit         |    75% duty cycle (750 |
    | Malfunction            | incorporated in the    | *  Open FP Rtn circuit |    msec ON, 250 msec   |
    |                        | rear electronics       |    to FPDM             |    OFF) through the    |
    |                        | module (REM). Also,    | *  Open or shorted     |    FPM circuit to the  |
    |                        | the REM does not use a |    circuit in the fuel |    PCM while the fault |
    |                        | FPM circuit.           |    pump                |    is being detected   |
    |                        | Diagnostic information | *  Locked fuel pump    |    by the FPDM. If the |
    |                        | will be set through    |    rotor               |    fault is no longer  |
    |                        | SCP. Indicates that    | *  Damaged FPDM        |    detected, the PCM   |
    |                        | the FPDM has detected  | *  For LS6/LS8,        |    will return to      |
    |                        | a fuel pump secondary  |    circuits associated |    sending an "all OK" |
    |                        | circuit fault. The     |    with the Fuel Pump  |    (50% duty cycle)    |
    |                        | FPDM will send a       |    relay               |    message to the PCM. |
    |                        | message to the PCM     |                        |    The PCM will keep   |
    |                        | through the FPM        |                        |    P1237 stored in     |
    |                        | circuit, indicating    |                        |    Continuous Memory.  |
    |                        | that this failure has  |                        | -  The FPDM controls   |
    |                        | been detected. The PCM |                        |    pump speed by       |
    |                        | will set the DTC when  |                        |    supplying a         |
    |                        | the message is         |                        |    "variable" ground   |
    |                        | received.              |                        |    on the RTN circuit. |
    |________________________|________________________|________________________|________________________|
    | P1238 - Fuel Pump      | See DTC P1237. P1238   |                        |                        |
    | Secondary Circuit      | is identical to P1237  |                        |                        |
    | Malfunction            | except P1238 will not  |                        |                        |
    |                        | illuminate the MIL.    |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1244 - Generator Load | The PCM monitors the   | *   ALI circuit open   | Verify operation of    |
    | Input Low              | GLI circuit, and will  |    or short            | charging system.       |
    |                        | set the DTC when the   | *   Damaged voltage    |                        |
    |                        | input is below         |    regulator/generator |                        |
    |                        | calibrated limit for a | *   Damaged PCM        |                        |
    |                        | calibrated amount of   |                        |                        |
    |                        | time.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1245 - Generator Load | The PCM monitors the   | *  ALI circuit open or | Verify operation of    |
    | Input High             | GLI circuit, and will  |    short               | charging system.       |
    |                        | set the DTC when the   | *  Damaged voltage     |                        |
    |                        | input is above a       |    regulator/generator |                        |
    |                        | calibrated limit for a | *  Damaged PCM         |                        |
    |                        | calibrated amount of   |                        |                        |
    |                        | time.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1246 - Generator Load | The PCM monitors the   | *  ALI circuit         | *  Verify operation of |
    | Input (2.0L Contour    | GLI circuit, and will  |    concern.            |    charging system.    |
    | /Mystique/Cougar)      | set the DTC when the   | *  Damaged voltage     | *  Verify battery is   |
    |                        | input is not within a  |    regulator/generator |    at proper charge.   |
    |                        | calibrated limit for a | *  Damaged PCM.        |                        |
    |                        | calibrated amount of   |                        |                        |
    |                        | time.                  |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1246 - Generator Load | The PCM monitors       | *  Generator circuit   | -  Verify battery      |
    | Input Failed (All      | generator load from    |    short to GND        |    voltage is 14.5V.   |
    | Others)                | the generator          | *  Generator circuit   | -  Verify generator    |
    |                        | /regulator in the form |    short to PWR        |    /regulator has the  |
    |                        | of frequency. The      | *  Generator circuit   |    correct part        |
    |                        | frequency range is     |    open                |    number.             |
    |                        | determined by the      | *  Generator drive     |                        |
    |                        | temperature of the     |    mechanism           |                        |
    |                        | voltage regulator      | *  Damaged generator   |                        |
    |                        | where 97% represents   |    /regulator assembly |                        |
    |                        | full load, below 6%    | *  Damaged PCM         |                        |
    |                        | means no load.         |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1260 - Theft Detected | Indicates the anti     | *  Previous theft      | Using the proper key   |
    | - Vehicle Immobilized  | -theft system has      |    condition           | or remote or keyless   |
    |                        | determined a theft     | *  Anti-Theft System   | entry to unlock the    |
    |                        | condition existed and  |    failure             | door will disarm the   |
    |                        | the engine is          |                        | anti-theft system and  |
    |                        | disabled.              |                        | enable fuel delivery   |
    |                        |                        |                        | to start the vehicle.  |
    |                        |                        |                        | Also check anti-theft  |
    |                        |                        |                        | system for DTCs.       |
    |________________________|________________________|________________________|________________________|
    | P1270 - Engine RPM     | Indicates the vehicle  | *  Wheel slippage      | The DTC indicates the  |
    | /Vehicle Speed Limiter | has been operated in a |    (water, ice, mud    | vehicle has been       |
    |                        | manner which caused    |    and snow)           | operated in a manner   |
    |                        | the engine or vehicle  | *  Excessive engine    | which caused the       |
    |                        | to exceed a            |    rpm in Neutral      | engine or vehicle      |
    |                        | calibration limit. The | *  Vehicle drive at a  | speed to exceed a      |
    |                        | engine rpm and vehicle |    high rate of speed  | calibrated limit.      |
    |                        | speed are continuously |                        |                        |
    |                        | monitored by the PCM.  |                        |                        |
    |                        | The DTC is set when    |                        |                        |
    |                        | the rpm or speed fall  |                        |                        |
    |                        | out of calibrated      |                        |                        |
    |                        | range. For additional  |                        |                        |
    |                        | information on the     |                        |                        |
    |                        | engine rpm/vehicle     |                        |                        |
    |                        | speed limiter, refer   |                        |                        |
    |                        | to Section 1,          |                        |                        |
    |                        | Electronic Engine      |                        |                        |
    |                        | Control (EC) System,   |                        |                        |
    |                        | Powertrain Control     |                        |                        |
    |                        | Software.              |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1285 - Cylinder Head  | Indicates an engine    | *  Low engine coolant  | On some applications   |
    | Over Temperature       | overheat condition was |    level               | when this fault occurs |
    | Sensed                 | sensed by the cylinder | *  Base engine         | the Engine Temperature |
    |                        | head temperature       |    concerns            | warning indicator will |
    |                        | sensor.                | *  Engine cooling      | illuminate or force    |
    |                        |                        |    system concerns     | the temperature gauge  |
    |                        |                        |                        | to full H (Hot) zone   |
    |                        |                        |                        | by ground circuit 39.  |
    |________________________|________________________|________________________|________________________|
    | P1288 - Cylinder Head  | Indicates the CHT      | *  Engine overheating  | Bring engine to        |
    | Temperature (CHT)      | sensor is out of Self  | *  Damaged harness     | operating temperature. |
    | Sensor Circuit Out of  | -Test range. Engine    |    connector           | If cold, re-run self   |
    | Self-Test Range        | not at operating       | *  Damaged PCM         | -test. If engine over  |
    |                        | temperature.           | *  Low engine coolant  | -heats check cooling   |
    |                        |                        |    level               | system.                |
    |                        |                        | *  Damaged CHT sensor  |                        |
    |________________________|________________________|________________________|________________________|
    | P1289 - Cylinder Head  | Indicates a CHT sensor | *   Grounded circuit   | Using signal           |
    | Temperature (CHT)      | circuit malfunction    |    in CHT harness      | simulation, disconnect |
    | Sensor Circuit High    | (shorted).             | *   Damaged CHT sensor | sensor and simulate a  |
    | Input (PCM STRATEGIES  |                        | *   Improper harness   | voltage on sensor      |
    | UP TO AND INCLUDING    |                        |    connection          | signal circuit.        |
    | 1998)                  |                        | *   Damaged PCM        | Simulated 1.0V signal  |
    |                        |                        |                        | and scan PID voltage   |
    |                        |                        |                        | value should be        |
    |                        |                        |                        | similar. If voltage is |
    |                        |                        |                        | similar check sensor,  |
    |                        |                        |                        | if voltage is not      |
    |                        |                        |                        | similar check related  |
    |                        |                        |                        | circuit and PCM. Note  |
    |                        |                        |                        | DTC P0117 may also be  |
    |                        |                        |                        | reported, this will    |
    |                        |                        |                        | activate the MIL       |
    |                        |                        |                        | light.                 |
    |________________________|________________________|________________________|________________________|
    | P1289 - Cylinder Head  | Indicates a CHT sensor | *  Open circuit in CHT | Using signal           |
    | Temperature (CHT)      | circuit malfunction    |    harness             | simulation, disconnect |
    | Sensor Circuit High    | (open).                | *  Damaged CHT sensor  | sensor and simulate a  |
    | Input (PCM STRATEGIES  |                        | *  Improper harness    | voltage on sensor      |
    | 1999 AND BEYOND)       |                        |    connection          | signal circuit.        |
    |                        |                        | *  Damaged PCM         | Simulated 1.0V signal  |
    |                        |                        |                        | and scan PID voltage   |
    |                        |                        |                        | value should be        |
    |                        |                        |                        | similar. If voltage is |
    |                        |                        |                        | similar check sensor,  |
    |                        |                        |                        | if voltage is not      |
    |                        |                        |                        | similar check related  |
    |                        |                        |                        | circuit and PCM. Note: |
    |                        |                        |                        | DTC P0118 may also be  |
    |                        |                        |                        | reported, this will    |
    |                        |                        |                        | activate the MIL       |
    |                        |                        |                        | light.                 |
    |________________________|________________________|________________________|________________________|
    | P1290 - Cylinder Head  | Indicates a CHT sensor | *  Open circuit in CHT | Using signal           |
    | Temperature (CHT)      | circuit malfunction    |    harness             | simulation, disconnect |
    | Sensor Circuit Low     | (open).                | *  Damaged CHT sensor  | sensor and simulate a  |
    | Input (PCM STRATEGIES  |                        | *  Improper harness    | voltage on sensor      |
    | UP TO AND INCLUDING    |                        |    connection          | signal circuit.        |
    | 1998)                  |                        | *  Damaged PCM         | Simulated 1.0V signal  |
    |                        |                        |                        | and scan PID voltage   |
    |                        |                        |                        | value should be        |
    |                        |                        |                        | similar. If voltage is |
    |                        |                        |                        | similar check sensor,  |
    |                        |                        |                        | if voltage is not      |
    |                        |                        |                        | similar check related  |
    |                        |                        |                        | circuit and PCM. Note  |
    |                        |                        |                        | DTC P0118 may also be  |
    |                        |                        |                        | reported, this will    |
    |                        |                        |                        | activate the MIL       |
    |                        |                        |                        | light.                 |
    |________________________|________________________|________________________|________________________|
    | P1290 - Cylinder Head  | Indicates a CHT sensor | *  Grounded circuit in | Using signal           |
    | Temperature (CHT)      | circuit malfunction    |    CHT harness         | simulation, disconnect |
    | Sensor Circuit Low     | (shorted).             | *  Damaged CHT sensor  | sensor and simulate a  |
    | Input (PCM STRATEGIES  |                        | *  Improper harness    | voltage on sensor      |
    | 1999 AND BEYOND)       |                        |    connection          | signal circuit.        |
    |                        |                        | *  Damaged PCM         | Simulated 1.0V signal  |
    |                        |                        |                        | and scan PID voltage   |
    |                        |                        |                        | value should be        |
    |                        |                        |                        | similar. If voltage is |
    |                        |                        |                        | similar check sensor,  |
    |                        |                        |                        | if voltage is not      |
    |                        |                        |                        | similar check related  |
    |                        |                        |                        | circuit and PCM. Note  |
    |                        |                        |                        | DTC P0117 may also be  |
    |                        |                        |                        | reported, this will    |
    |                        |                        |                        | activate the MIL       |
    |                        |                        |                        | light.                 |
    |________________________|________________________|________________________|________________________|
    | P1299 - Cylinder Head  | Indicates an engine    | *  Engine cooling      | Refer to Section 1,    |
    | Over Temperature       | overheat condition was |    system concerns     | Electronic Engine      |
    | Protection Active      | detected by the        | *  Low engine coolant  | Control (EC) System,   |
    |                        | cylinder head          |    level               | for more information   |
    |                        | temperature (CHT)      | *  Base engine         | on Fail-safe Cooling   |
    |                        | sensor. An FMEM        |    concerns            | Strategy and cylinder  |
    |                        | Strategy called Fail   |                        | head temperature       |
    |                        | -safe Cooling was      |                        | sensor.                |
    |                        | activated to cool the  |                        |                        |
    |                        | engine.                |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1309 - Misfire        | When the misfire       | *  Camshaft position   | Verify the CMP is      |
    | Monitor Disabled       | monitor is disabled,   |    sensor              | installed correctly    |
    |                        | usually due to the     | *  Powertrain control  | and not out of         |
    |                        | input signal generated |    module              | synchronization.       |
    |                        | by the camshaft        | *  ECT, MAF, and CKP   |                        |
    |                        | position (CMP) sensor, |    sensors             |                        |
    |                        | by sensing the passage |                        |                        |
    |                        | of teeth from the CMP  |                        |                        |
    |                        | wheel.                 |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1380 - Variable Cam   | The comprehensive      | *  Open or short VCT   | DTC P1380 is a VCT     |
    | Timing Solenoid A      | component monitor(CCM) |    circuit             | circuit check. Testing |
    | Circuit Malfunction    | monitors the VCT       | *  Open VPWR circuit   | should include wires,  |
    |                        | circuit to the PCM for | *  Damaged PCM         | solenoid coil and PCM. |
    |                        | high and low voltage.  | *  Open or short VCT   |                        |
    |                        | If during testing      |    solenoid valve      |                        |
    |                        | voltage was to fall    |                        |                        |
    |                        | below a calibrated     |                        |                        |
    |                        | limit a calibrated     |                        |                        |
    |                        | amount of time the     |                        |                        |
    |                        | test will fail.        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1381 - Variable Cam   | The comprehensive      | *  Cam timing          | P1381 DTC is a check   |
    | Timing Over-advanced   | component monitor      |    improperly set      | of the VCT unit.       |
    | (Bank 1)               | (CCM) monitors the VCT | *  No oil flow to the  | Testing should not     |
    |                        | position for an over   |    VCT piston chamber  | include electrical     |
    |                        | -advanced camshaft     | *  Low oil pressure    | checks. Diagnostics    |
    |                        | timing. The test fails | *  VCT solenoid valve  | and repair for the VCT |
    |                        | when the camshaft      |    stuck closed        | unit are located in    |
    |                        | timing exceeds a       | *  Camshaft advance    | the Workshop Manual.   |
    |                        | maximum calibrated     |    mechanism binding   |                        |
    |                        | value or remains in an |    (VCT unit)          |                        |
    |                        | advanced position.     |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1383 - Variable Cam   | The comprehensive      | *  Cam timing          | DTC P1383 is a check   |
    | Timing Over-retarded   | component monitor      |    improperly set      | of the VCT unit.       |
    | (Bank 1)               | (CCM) monitors the VCT | *  Continuous oil flow | Testing should not     |
    |                        | position for over      |    to the VCT piston   | include electrical     |
    |                        | -retarded camshaft     |    chamber             | checks. Engine will    |
    |                        | timing. The test fails | *  VCT solenoid valve  | idle rough, hard       |
    |                        | when the camshaft      |    stuck open          | starting and may       |
    |                        | timing exceeds a       | *  Camshaft advance    | stall. Diagnostics and |
    |                        | maximum calibrated     |    mechanism binding   | repair for the VCT     |
    |                        | value or remains in an |    (VCT unit)          | unit are located in    |
    |                        | retarded position.     |                        | the Workshop Manual.   |
    |________________________|________________________|________________________|________________________|
    | P1390 - Octane Adjust  | The octane adjust is   | *  Powertrain control  | Do not activate the    |
    | (OCTADJ)               | software activated in  |    module (PCM)        | octane adjust software |
    |                        | the powertrain control |                        | unless directed by a   |
    |                        | module, used to retard |                        | Technical Service      |
    |                        | spark timing by three  |                        | Bulletin.              |
    |                        | degrees. The hardware  |                        |                        |
    |                        | shorting bar has been  |                        |                        |
    |                        | removed.               |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1400 - DPF EGR Sensor | The EGR monitor checks | *  DPFEGR circuit      | A DPF EGR PID reading  |
    | Circuit Low Voltage    | the DPF EGR sensor     |    short to GND        | less than 0.2 volt     |
    | Detected               | signal to the PCM for  | *  Damaged DPF EGR     | with the key ON and    |
    |                        | low voltage. The test  |    sensor              | engine OFF or running, |
    |                        | fails when the average | *  VREF short to GND   | indicates a hard       |
    |                        | voltage to the PCM     | *  Damaged PCM         | fault.                 |
    |                        | drops to a voltage     |                        |                        |
    |                        | less than the minimum  |                        |                        |
    |                        | calibrated value.      |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1401 - DPF EGR Sensor | The EGR monitor checks | *  DPF EGR circuit     | A DPF EGR PID reading  |
    | Circuit High Voltage   | the DPF EGR sensor     |    open                | greater than 4.5 volts |
    | Detected               | signal to the PCM for  | *  VREF short to PWR   | with the key ON and    |
    |                        | high voltage. The test | *  Damaged DPF EGR     | engine OFF or running, |
    |                        | fails when the average |    sensor              | indicates a hard       |
    |                        | voltage to the PCM     | *  DPFEGR circuit      | fault.                 |
    |                        | goes to a voltage      |    short to PWR        |                        |
    |                        | greater than the       | *  SIG RTN circuit     |                        |
    |                        | maximum calibrated     |    open                |                        |
    |                        | value.                 | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P1405 - DPF EGR Sensor | While driving, the EGR | *  Upstream hose is    | -  Look for signs of   |
    | Upstream Hose Off or   | monitor commands the   |    disconnected        |    water or icing in   |
    | Plugged                | EGR valve closed and   | *  Upstream hose is    |    hose                |
    |                        | checks the             |    plugged (ice)       | -  Verify hose         |
    |                        | differential pressure  | *  Plugged or damaged  |    connection and      |
    |                        | across the EGR         |    EGR tube            |    routing (no         |
    |                        | orifice. The test      |                        |    excessive dips)     |
    |                        | fails when the signal  |                        | -  Verify DPF EGR      |
    |                        | from the DPF EGR       |                        |    sensor proper       |
    |                        | sensor indicates EGR   |                        |    mounting and        |
    |                        | flow is in the         |                        |    function (view DPF  |
    |                        | negative direction.    |                        |    EGR PID while       |
    |                        |                        |                        |    applying and        |
    |                        |                        |                        |    releasing vacuum    |
    |                        |                        |                        |    directly to sensor  |
    |                        |                        |                        |    with a hand pump)   |
    |________________________|________________________|________________________|________________________|
    | P1406 - DPF EGR Sensor | While driving, the EGR | *  Downstream hose is  | -  Look for signs of   |
    | Downstream Hose Off or | monitor commands the   |    disconnected        |    water or icing in   |
    | Plugged                | EGR valve closed and   | *  Downstream hose is  |    hose                |
    |                        | checks the             |    plugged (ice)       | -  Verify connection   |
    |                        | differential pressure  | *  Plugged or damaged  |    and routing (no     |
    |                        | across the EGR         |    EGR tube            |    excessive dips)     |
    |                        | orifice. The test      |                        | -  Verify DPF EGR      |
    |                        | fails when the signal  |                        |    sensor proper       |
    |                        | from the DPF EGR       |                        |    mounting and        |
    |                        | sensor continues to    |                        |    function (view      |
    |                        | indicate EGR flow even |                        |    DPFEGR PID while    |
    |                        | after the EGR valve is |                        |    applying and        |
    |                        | commanded closed.      |                        |    releasing vacuum    |
    |                        |                        |                        |    directly to sensor  |
    |                        |                        |                        |    with a hand pump)   |
    |________________________|________________________|________________________|________________________|
    | P1408 - EGR Flow Out   | This test is performed | See Possible Causes    |                        |
    | of Self-Test Range     | during the KOER on     | for DTC P0401.         |                        |
    |                        | demand self-test only. |                        |                        |
    |                        | The EGR system is      |                        |                        |
    |                        | commanded ON at a      |                        |                        |
    |                        | fixed engine speed.    |                        |                        |
    |                        | The test fails and the |                        |                        |
    |                        | DTC is output when the |                        |                        |
    |                        | measured EGR flow      |                        |                        |
    |                        | falls below the        |                        |                        |
    |                        | required calibrated    |                        |                        |
    |                        | minimum.               |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1409 - EGR Vacuum     | This test checks the   | *  EGRVR circuit open  | The EGR vacuum         |
    | Regulator Solenoid     | electrical function of | *  VPWR open to EGRVR  | regulator solenoid     |
    | Circuit Malfunction    | the EGRVR. solenoid.   |    solenoid            | resistance is from 26  |
    |                        | The test fails when    | *  EGRVR circuit short | to 40 ohms.            |
    |                        | the EGRVR circuit      |    to VPWR or GND      |                        |
    |                        | voltage is either too  | *  Damaged EGRVR       |                        |
    |                        | high or too low when   |    solenoid            |                        |
    |                        | compared to the        | *  Damaged PCM         |                        |
    |                        | expected voltage       |                        |                        |
    |                        | range. The EGR system  |                        |                        |
    |                        | must be enabled for    |                        |                        |
    |                        | the test to be         |                        |                        |
    |                        | completed.             |                        |                        |
    |________________________|________________________|________________________|________________________|
</pre>
 

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Discussion Starter #5 (Edited)
Re: STICKY ME! DTC Descriptions

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<pre>
    |          DTC           |      Description       |    Possible Causes     |    Diagnostic Aides    |
    |________________________|________________________|________________________|________________________|
    | P1411 - Secondary Air  | The secondary air      | *  Electric AIR Pump   | In order to test the   |
    | Injection (AIR) system | injection system does  | *  Hose from AIR pump  | AIR pump, it must be   |
    | downstream flow        | not detect the         |    leak                | capable of driving the |
    |                        | presence of air in the | *  AIR bypass solenoid | HO2S lean.             |
    |                        | exhaust when           |    leak/blocked        |                        |
    |                        | introduced by the      | *  Hose from AIR pump  |                        |
    |                        | secondary air          |    blocked             |                        |
    |                        | injection system       | *  AIR bypass solenoid |                        |
    |                        |                        |    stuck open/closed   |                        |
    |________________________|________________________|________________________|________________________|
    | P1413 - Secondary Air  | The secondary air      | *  Open AIR monitor    |                        |
    | Injection system       | injection system       |    circuit from the    |                        |
    | monitor circuit high   | monitor circuit is     |    pump                |                        |
    |                        | high, indicating the   | *  AIR circuit short   |                        |
    |                        | electrical AIR pump is |    to power            |                        |
    |                        | on although the        | *  Damaged Solid State |                        |
    |                        | electrical AIR pump    |    relay               |                        |
    |                        | was commanded off by   | *  Open AIR pump       |                        |
    |                        | the PCM.               |    ground              |                        |
    |                        |                        | *  Damaged AIR pump    |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P1414 - Secondary Air  | The secondary air      | *  Open B+ circuit     | The AIR Monitor        |
    | Injection system       | injection system       | *  Open AIR circuit    | circuit is held low by |
    | monitor circuit low    | monitor circuit is low | *  Damaged PCM         | the resistance path    |
    |                        | , indicating the       | *  AIR circuit short   | through the AIR pump   |
    |                        | electrical AIR pump is |    to ground           | when the pump is off.  |
    |                        | off although the       | *  Damaged AIR pump    | Also, look for open    |
    |                        | electrical AIR pump    | *  Damaged Solid State | circuit from SSR to    |
    |                        | was commanded on by    |    Relay               | AIR pump.              |
    |                        | the PCM.               |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1443 - EVAP Control   | Monitors the fuel      | *  Pinched, blocked or | Check for audible      |
    | System Canister Purge  | vapor flow between the |    plugged fuel vapor  | vacuum noise in the    |
    | Valve (Mechanical)     | engine intake manifold |    tubes/hoses (except | engine compartment or  |
    | Malfunction            | and the EVAP canister. |    between fuel tank   | significant fuel odor  |
    |                        | The system failure     |    and EVAP canister)  | in the engine          |
    |                        | occurs when a leak or  | *  Damaged EVAP        | compartment or near    |
    |                        | blockage between the   |    canister            | the EVAP canister.     |
    |                        | intake manifold, the   | *  Disconnected,       |                        |
    |                        | EVAP canister purge    |    cracked or cut fuel |                        |
    |                        | valve and the EVAP     |    vapor tubes/hoses   |                        |
    |                        | canister is detected   |    (except between     |                        |
    |                        | by the PCM.            |    fuel tank and EVAP  |                        |
    |                        |                        |    canister)           |                        |
    |                        |                        | *  Damaged EVAP        |                        |
    |                        |                        |    canister purge      |                        |
    |                        |                        |    valve               |                        |
    |________________________|________________________|________________________|________________________|
    | P1450 - Unable to      | Monitors the fuel      | *  Blockages or kinks  |                        |
    | Bleed Up Fuel Tank     | vapor vacuum and       |    in EVAP canister    |                        |
    | Vacuum                 | pressure in the fuel   |    tube or EVAP        |                        |
    |                        | tank. The system       |    canister purge      |                        |
    |                        | failure occurs when    |    outlet tube         |                        |
    |                        | the EVAP running loss  |    (between fuel tank, |                        |
    |                        | monitor detects        |    EVAP canister purge |                        |
    |                        | excessive fuel tank    |    valve and EVAP      |                        |
    |                        | vacuum with the engine |    canister)           |                        |
    |                        | running (but not at    | *  Fuel filler cap     |                        |
    |                        | idle).                 |    stuck closed (no    |                        |
    |                        |                        |    vacuum relief)      |                        |
    |                        |                        | *  Contaminated fuel   |                        |
    |                        |                        |    vapor elbow on EVAP |                        |
    |                        |                        |    canister            |                        |
    |                        |                        | *  Restricted EVAP     |                        |
    |                        |                        |    canister            |                        |
    |                        |                        | *  CV solenoid stuck   |                        |
    |                        |                        |    open (partially or  |                        |
    |                        |                        |    fully)              |                        |
    |                        |                        | *  Plugged CV solenoid |                        |
    |                        |                        |    filter              |                        |
    |                        |                        | *  EVAP canister purge |                        |
    |                        |                        |    valve stuck open    |                        |
    |                        |                        | *  VREF circuit open   |                        |
    |                        |                        |    (harness near FTP   |                        |
    |                        |                        |    sensor, FTP sensor  |                        |
    |                        |                        |    or PCM)             |                        |
    |                        |                        | *  Damaged FTP sensor  |                        |
    |________________________|________________________|________________________|________________________|
    | P1451 - EVAP Control   | Monitors the canister  | *  VPWR circuit open   | -  Monitor EVAPCV PID  |
    | System Canister Vent   | vent (CV) solenoid     | *  CV solenoid circuit |    and voltage between |
    | Solenoid Circuit       | circuit for an         |    shorted to PWR GND  |    canister vent       |
    | Malfunction            | electrical failure.    |    or CHASSIS GND      |    solenoid signal and |
    |                        | The test fails when    | *  Damaged CV solenoid |    PWR GND in output   |
    |                        | the signal moves       | *  CV solenoid circuit |    test mode with key  |
    |                        | outside the minimum or |    open                |    ON engine OFF (or   |
    |                        | maximum allowable      | *  CV solenoid circuit |    in key ON engine    |
    |                        | calibrated parameters  |    shorted to VPWR     |    RUNNING mode)       |
    |                        | for a specified        | *  Damaged PCM         | -  EVAPCV PID at 0%    |
    |                        | canister vent duty     |                        |    and voltage less    |
    |                        | cycle by PCM command.  |                        |    than 1.0 volt (or   |
    |                        |                        |                        |    EVAPCV PID at 100%  |
    |                        |                        |                        |    and voltage greater |
    |                        |                        |                        |    than 0.5 volt)      |
    |                        |                        |                        |    indicates a hard    |
    |                        |                        |                        |    fault               |
    |________________________|________________________|________________________|________________________|
    | P1460 - Wide Open      | NOTE: For applications | *  Open or shorted WAC | -  When the WACF PID   |
    | Throttle A/C Cutout    | that use a normally    |    circuit             |    reads YES, a fault  |
    | Primary Circuit        | open relay to control  | *  Damaged WAC relay   |    is currently        |
    | Malfunction            | the A/C clutch, the    |    (or CCRM)           |    present             |
    |                        | following description  | *  Open VPWR circuit   | -  An open circuit or  |
    |                        | applies to the A/C     |    to WAC relay        |    short to ground can |
    |                        | clutch relay control   | *  Damaged PCM         |    only be detected    |
    |                        | circuit. Monitors the  |                        |    when the PCM is not |
    |                        | wide open throttle A/C |                        |    grounding the       |
    |                        | cutoff (WAC) circuit   |                        |    circuit             |
    |                        | output from the PCM.   |                        | -  A short to power    |
    |                        | The test fails if:     |                        |    can only be         |
    |                        | When the PCM grounds   |                        |    detected when the   |
    |                        | the WAC circuit,       |                        |    PCM is grounding    |
    |                        | excessive current draw |                        |    the circuit         |
    |                        | is detected on the WAC |                        | -  During KOEO and     |
    |                        | circuit; or with the   |                        |    KOER self-test, the |
    |                        | WAC circuit not        |                        |    WAC circuit will be |
    |                        | grounded by the PCM,   |                        |    cycled ON and OFF   |
    |                        | voltage is not         |                        | -  Verify A/C and      |
    |                        | detected on the WAC    |                        |    defrost were OFF    |
    |                        | circuit (the PCM       |                        |    during KOEO and     |
    |                        | expects to detect VPWR |                        |    KOER self-test      |
    |                        | voltage coming through |                        |    (Check ACCS PID to  |
    |                        | the WAC relay coil to  |                        |    verify)             |
    |                        | the WAC circuit).      |                        | -  If vehicle is not   |
    |                        |                        |                        |    equipped with A/C,  |
    |                        |                        |                        |    DTC P1460 can be    |
    |                        |                        |                        |    ignored             |
    |________________________|________________________|________________________|________________________|
    | P1461 - Air            | ACP inputs a voltage   | *  ACP sensor circuit  | Verify VREF voltage    |
    | Conditioning Pressure  | to the PCM. If the     |    short to PWR        | between 4.0 and 6.0V.  |
    | Sensor (ACP) Sensor    | voltage is above a     | *  ACP circuit open    |                        |
    | High Voltage Detected  | calibrated level the   | *  Damaged PCM         |                        |
    |                        | DTC will set.          | *  ACP circuit short   |                        |
    |                        |                        |    to VREF             |                        |
    |                        |                        | *  ACP circuit short   |                        |
    |                        |                        |    to SIGRTN           |                        |
    |                        |                        | *  Damaged ACP sensor  |                        |
    |________________________|________________________|________________________|________________________|
    | P1462 - Air            | ACP inputs a voltage   | *  ACP circuit short   | Verify VREF voltage    |
    | Conditioning Pressure  | to the PCM. If the     |    to GND or SIGRTN    | between 4.0 and 6.0V.  |
    | Sensor (ACP) Sensor    | voltage is below the   | *  VREF circuit open   |                        |
    | Low Voltage Detected   | calibrated level the   | *  Damaged PCM         |                        |
    |                        | DTC will set.          | *  Open ACP circuit    |                        |
    |                        |                        | *  Damaged ACP sensor  |                        |
    |________________________|________________________|________________________|________________________|
    | P1463 - Air            | Each time the A/C      | *  A/C system          | Verify A/C system      |
    | Conditioning Pressure  | clutch engages, the    |    mechanical failure  | function, including    |
    | Sensor (ACP)           | PCM is looking for a   | *  Open ACP or VREF    | refrigerant charge.    |
    | Insufficient Pressure  | pressure change in the |    circuit             |                        |
    | Change                 | refrigerant. If the    | *  A/C sensor damaged  |                        |
    |                        | change in pressure is  | *  A/C system          |                        |
    |                        | outside of the         |    electrical failure  |                        |
    |                        | calibration the DTC    | *  A/C clutch always   |                        |
    |                        | will set.              |    engaged             |                        |
    |________________________|________________________|________________________|________________________|
    | P1464 - A/C Demand Out | Indicates the ACCS     | *  A/C was on during   | If A/C or defrost were |
    | Of Self-Test Range     | input to the PCM was   |    self-test           | on during self-test,   |
    |                        | high during Self-Test. | *  A/C Clutch PWR      | turn off and rerun     |
    |                        |                        |    circuit short to    | test.                  |
    |                        |                        |    power (applications |                        |
    |                        |                        |    with N/C WAC relay  |                        |
    |                        |                        |    contacts)           |                        |
    |                        |                        | *  ACCS circuit short  |                        |
    |                        |                        |    to power            |                        |
    |                        |                        | *  Damaged A/C demand  |                        |
    |                        |                        |    switch              |                        |
    |                        |                        | *  Damaged WAC relay   |                        |
    |                        |                        |    (or CCRM)           |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P1469 - Low A/C        | Indicates frequent A/C | *  Mechanical A/C      | -  An intermittent     |
    | Cycling Period         | compressor clutch      |    system concern      |    open circuit,       |
    |                        | cycling.               |    (such as low        |    although possible,  |
    |                        |                        |    refrigerant charge, |    is unlikely         |
    |                        |                        |    damaged A/C cycling | -  This test was       |
    |                        |                        |    switch)             |    designed to protect |
    |                        |                        | *  Intermittent open   |    the transmission.   |
    |                        |                        |    between the cycling |    In some strategies, |
    |                        |                        |    pressure switch and |    the PCM will unlock |
    |                        |                        |    pin 41 (ACCS) to    |    the torque          |
    |                        |                        |    the PCM             |    converter during A  |
    |                        |                        | *  Intermittent open   |    /C clutch           |
    |                        |                        |    in IGN RUN circuit  |    engagement. If a    |
    |                        |                        |    to cycling pressure |    concern is present  |
    |                        |                        |    switch (if          |    that results in     |
    |                        |                        |    applicable)         |    frequent A/C clutch |
    |                        |                        |                        |    cycling, damage     |
    |                        |                        |                        |    could occur if the  |
    |                        |                        |                        |    torque converter    |
    |                        |                        |                        |    was cycled at these |
    |                        |                        |                        |    intervals. This     |
    |                        |                        |                        |    test will detect    |
    |                        |                        |                        |    this condition, set |
    |                        |                        |                        |    the DTC and prevent |
    |                        |                        |                        |    the torque          |
    |                        |                        |                        |    converter from      |
    |                        |                        |                        |    excessive cycling.  |
    |________________________|________________________|________________________|________________________|
    | P1474 - Low Fan        | Monitors the low fan   | *  Open or shorted LFC | -  When the LFC PID    |
    | Control Primary        | control (LFC) (fan     |    /FC circuit         |    reads YES, a fault  |
    | Circuit Failure        | control [FC] for one   | *  Open VPWR circuit   |    is currently        |
    |                        | speed fan application) |    to low speed fan    |    present             |
    |                        | primary circuit output |    relay               | -  An open circuit or  |
    |                        | from the PCM. The test | *  Damaged fuel pump   |    short to ground can |
    |                        | fails if: When the PCM |    relay (or CCRM)     |    only be detected    |
    |                        | grounds the LFC/FC     | *  Damaged PCM         |    when the PCM is not |
    |                        | circuit, excessive     |                        |    grounding the LFC   |
    |                        | current draw is        |                        |    /FC circuit         |
    |                        | detected on the LFC/FC |                        | -  A short to power    |
    |                        | circuit; or with the   |                        |    can only be         |
    |                        | LFC/FC circuit not     |                        |    detected when the   |
    |                        | grounded by the PCM,   |                        |    PCM is grounding    |
    |                        | voltage is not         |                        |    the LFC/FC circuit. |
    |                        | detected on the LFC/FC |                        |    During KOEO and     |
    |                        | circuit (the PCM       |                        |    KOER Self-Test, the |
    |                        | expects to detect VPWR |                        |    LFC/FC circuit will |
    |                        | voltage coming through |                        |    be cycled on and    |
    |                        | the low speed fan      |                        |    off                 |
    |                        | relay [or CCRM] coil   |                        |                        |
    |                        | to the LFC/FC          |                        |                        |
    |                        | circuit).              |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1474 - Hydraulic      | This test checks the   | *  HCF circuit open    | The HCF solenoid is    |
    | Cooling Fan Primary    | electrical function of | *  HCF circuit short   | integrated in the HCF  |
    | Circuit Failure (HCF)  | the (HCF) primary      |    to power            | pump which looks like  |
    |                        | circuit. The test      | *  HCF circuit short   | a power steering pump. |
    |                        | fails if: the PCM      |    to ground           | The electrical         |
    |                        | detects voltage either | *  Damaged HCF         | resistance of the      |
    |                        | too high or too low    |    solenoid            | solenoid windings is   |
    |                        | when compared to the   | *  Damaged PCM         | nominally 10 ohms.     |
    |                        | expected voltage range |                        |                        |
    |                        | on the (HCF) primary   |                        |                        |
    |                        | circuit.               |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1479 - High Fan       | Monitors the high fan  | *  Open or shorted HFC | -  When the HFC PID    |
    | Control Primary        | control (HFC) primary  |    circuit             |    reads YES, a fault  |
    | Circuit Failure        | circuit output from    | *  Open VPWR circuit   |    is currently        |
    |                        | the PCM. The test      |    to high speed fan   |    present             |
    |                        | fails if: With the HFC |    relay               | -  An open circuit or  |
    |                        | output commanded on    | *  Damaged high speed  |    short to ground can |
    |                        | (grounded), excessive  |    fan relay (or CCRM) |    only be detected    |
    |                        | current draw is        | *  Damaged PCM         |    when the PCM is not |
    |                        | detected on the HFC    |                        |    grounding the HFC   |
    |                        | circuit; or with the   |                        |    circuit             |
    |                        | HFC circuit commanded  |                        | -  A short to power    |
    |                        | off, voltage is not    |                        |    can only be         |
    |                        | detected on the HFC    |                        |    detected when the   |
    |                        | circuit (the PCM       |                        |    PCM is grounding    |
    |                        | expects to detect VPWR |                        |    the HFC circuit     |
    |                        | voltage coming through |                        | -  During KOEO and     |
    |                        | the high speed fan     |                        |    KOER self-test, the |
    |                        | relay [or CCRM] coil   |                        |    HFC circuit will be |
    |                        | to the HFC circuit).   |                        |    cycled on and off   |
    |________________________|________________________|________________________|________________________|
    | P1500 - Vehicle Speed  | Indicates the VSS      | *  Intermittent VSS    |                        |
    | Sensor (VSS)           | input signal was       |    connections         |                        |
    | Intermittent           | intermittent. This DTC | *  Intermittent open   |                        |
    |                        | is set when a VSS      |    in VSS harness      |                        |
    |                        | fault interferes with  |    circuit(s)          |                        |
    |                        | other OBDII tests,     | *  Intermittent short  |                        |
    |                        | such as Catalyst       |    in VSS harness      |                        |
    |                        | efficiency monitor,    |    circuit(s)          |                        |
    |                        | EVAP monitor, HO2S     | *  Damaged VSS         |                        |
    |                        | monitor, etc.          | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P1501 - Vehicle Speed  | Indicates the VSS      | *  Noisy VSS input     | Check for VSS input to |
    | Sensor (VSS) Out of    | input signal is out of |    signal from Radio   | be 0 mph when vehicle  |
    | Self Test Range        | Self Test range. If    |    Frequency           | transmission is in     |
    |                        | the PCM detects a VSS  |    Interference/       | Park.                  |
    |                        | input signal any time  |    Electro-Magnetic    |                        |
    |                        | during Self Test, a    |    Interference (RFI   |                        |
    |                        | DTC P1501 will be set  |    /EMI) external      |                        |
    |                        | and the test will      |    sources such as     |                        |
    |                        | abort.                 |    ignition wires,     |                        |
    |                        |                        |    charging circuit or |                        |
    |                        |                        |    after market        |                        |
    |                        |                        |    equipment.          |                        |
    |________________________|________________________|________________________|________________________|
    | P1502 - Vehicle Speed  | Indicates the          | *  Refer to possible   | Refer to diagnostic    |
    | Sensor (VSS)           | powertrain control     |    causes for P0500.   | aids for P0500.        |
    | Intermittent           | module (PCM) detected  |                        |                        |
    |                        | an error in the        |                        |                        |
    |                        | vehicle speed          |                        |                        |
    |                        | information. Vehicle   |                        |                        |
    |                        | speed data is received |                        |                        |
    |                        | from either the        |                        |                        |
    |                        | vehicle speed sensor   |                        |                        |
    |                        | (VSS), transfer case   |                        |                        |
    |                        | speed sensor (TCSS),   |                        |                        |
    |                        | anti-lock brake system |                        |                        |
    |                        | (ABS) control module,  |                        |                        |
    |                        | generic electronic     |                        |                        |
    |                        | module (GEM), or       |                        |                        |
    |                        | central timer module   |                        |                        |
    |                        | (CTM). This DTC is set |                        |                        |
    |                        | the same way as P0500. |                        |                        |
    |                        | However, it is         |                        |                        |
    |                        | intended to flash the  |                        |                        |
    |                        | transmission control   |                        |                        |
    |                        | indicator lamp (TCIL)  |                        |                        |
    |                        | for first time VSS     |                        |                        |
    |                        | circuit error          |                        |                        |
    |                        | /malfunctions.         |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1502 - Vehicle Speed  | Indicates the          | Refer to possible      | Refer to diagnostic    |
    | Sensor (VSS)           | powertrain control     | causes for P0500       | aides for P0500        |
    | Intermittent (TCIL     | module (PCM) detected  |                        |                        |
    | illuminates)           | an error in the        |                        |                        |
    |                        | vehicle speed          |                        |                        |
    |                        | information. Vehicle   |                        |                        |
    |                        | speed data is received |                        |                        |
    |                        | from either the        |                        |                        |
    |                        | vehicle speed sensor   |                        |                        |
    |                        | (VSS), anti-lock brake |                        |                        |
    |                        | system (ABS) control   |                        |                        |
    |                        | module, generic        |                        |                        |
    |                        | electronic module      |                        |                        |
    |                        | (GEM), or central      |                        |                        |
    |                        | timer module (CTM).    |                        |                        |
    |                        | This DTC is set the    |                        |                        |
    |                        | same way as P0500.     |                        |                        |
    |                        | However, it is         |                        |                        |
    |                        | intended to flash the  |                        |                        |
    |                        | transmission control   |                        |                        |
    |                        | indicator lamp (TCIL)  |                        |                        |
    |                        | for first time VSS     |                        |                        |
    |                        | circuit error          |                        |                        |
    |                        | /malfunctions.         |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1504 - Idle Air       | This DTC is set when   | *  IAC circuit open    | -  The IAC solenoid    |
    | Control (IAC) Circuit  | the PCM detects an     | *  VPWR to IAC         |    resistance is from  |
    | Malfunction            | electrical load        |    solenoid open       |    6 to 13 ohms.       |
    |                        | failure on the IAC     | *  IAC circuit short   |   *  IAC valve stuck   |
    |                        | output circuit.        |    to PWR              |      open              |
    |                        |                        | *  IAC circuit short   |   *  Vacuum leaks      |
    |                        |                        |    to GND              |   *  Failed EVAP       |
    |                        |                        | *  Damaged IAC valve   |      system            |
    |                        |                        | *  Damaged PCM         |   *  Damaged PCM       |
    |                        |                        |                        | -  The IAC solenoid    |
    |                        |                        |                        |    resistance is from  |
    |                        |                        |                        |    6 to 13 ohms.       |
    |________________________|________________________|________________________|________________________|
    | P1506 - Idle Air       | This DTC is set when   | *  IAC circuit short   | Disconnect IAC valve   |
    | Control (IAC)          | the PCM detects engine |    to GND              | and look for little or |
    | Overspeed Error        | idle speed that is     | *  Damaged IAC valve   | no change in engine    |
    |                        | greater than the       |                        | rpm as an indication   |
    |                        | desired rpm.           |                        | of a stuck or damaged  |
    |                        |                        |                        | valve.                 |
    |________________________|________________________|________________________|________________________|
    | P1507 - Idle Air       | This DTC is set when   | *  IAC circuit open    | -  The IAC solenoid    |
    | Control (IAC)          | the PCM detects engine | *  IAC circuit short   |    resistance is from  |
    | Underspeed Error       | idle speed that is     |    to PWR              |    6 to 13 ohms        |
    |                        | less than the desired  | *  VPWR to IAC         | -  Disconnect IAC      |
    |                        | rpm.                   |    solenoid open       |    valve and look for  |
    |                        |                        | *  Air inlet is        |    no change in engine |
    |                        |                        |    plugged             |    rpm as an           |
    |                        |                        | *  Damaged IAC         |    indication of a     |
    |                        |                        |    solenoid            |    stuck or damaged    |
    |                        |                        | *  Damaged PCM         |    valve               |
    |________________________|________________________|________________________|________________________|
    | P1516 - Intake         |                        |                        |                        |
    | Manifold Runner        |                        |                        |                        |
    | Control Input Error    |                        |                        |                        |
    | (Bank 1)               |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1517 - Intake         | The IMRC system is     | *  Mechanical concern  | -  An IMRCM PID        |
    | Manifold Runner        | monitored for failure  |    - bind, seize,      |    reading at closed   |
    | Control Input Error    | during continuous or   |    damage or           |    throttle that is    |
    | (Bank 2)               | key ON engine OFF self |    obstruction of IMRC |    less than VREF may  |
    |                        | -test. Each DTC will   |    hardware            |    indicate a fault    |
    |                        | distinguish the        |                        | -  An IMRCM PID        |
    |                        | corresponding failed   |                        |    reading near 1 volt |
    |                        | bank for IMRC actuator |                        |    or greater with     |
    |                        | assemblies with dual   |                        |    engine rpm of at    |
    |                        | monitor switches. The  |                        |    least 3000 may      |
    |                        | test fails when the    |                        |    indicate a fault    |
    |                        | signal on the monitor  |                        |                        |
    |                        | pin is outside an      |                        |                        |
    |                        | expected calibrated    |                        |                        |
    |                        | range.                 |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1518 - Intake         | The IMRC system is     | *  IMRC monitor signal | An IMRCM PID reading   |
    | Manifold Runner        | monitored for failure  |    circuit shorted to  | approximately near 1   |
    | Control Malfunction    | during continuous, key |    PWR GND or SIG RTN  | volt at closed         |
    | (Stuck Open)           | ON engine OFF or key   | *  Damaged IMRC        | throttle may indicate  |
    |                        | ON engine running self |    actuator            | a fault                |
    |                        | -test. The test fails  | *  Damaged PCM         |                        |
    |                        | when the signal on the |                        |                        |
    |                        | monitor pin is less    |                        |                        |
    |                        | than an expected       |                        |                        |
    |                        | calibrated range at    |                        |                        |
    |                        | closed throttle.       |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1519 - Inlet Manifold | The IMRC system is     | *  IMRC monitor        | An IMRCM PID reading   |
    | Runner Control         | monitored for failure  |    circuit open        | at VREF with engine    |
    | Malfunction (Stuck     | during continuous, key | *  IMRC control        | rpm of at least 3000   |
    | Closed)                | ON engine OFF or key   |    circuit open        | may indicate a fault.  |
    |                        | ON engine running self | *  IMRC monitor        |                        |
    |                        | -test. The test fails  |    circuit short to    |                        |
    |                        | when the signal on the |    VREF                |                        |
    |                        | monitor pin is more    | *  IMRC monitor return |                        |
    |                        | than an expected       |    circuit open        |                        |
    |                        | calibrated range with  | *  Damaged IMRC        |                        |
    |                        | IMRC activated.        |    actuator            |                        |
    |                        |                        | *  IMRC VPWR circuit   |                        |
    |                        |                        |    open                |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P1549 - Intake         | The IMCC or intake     | *  Open IMT valve      | -  An IMT valve fault  |
    | Manifold Communication | manifold tuning (IMT)  |    circuit             |    PID (IMTVF)         |
    | Control Circuit        | valve system is        | *  Open VPWR circuit   |    displaying YES      |
    | Malfunction            | monitored for failure  | *  Shorted IMT valve   |    status may indicate |
    |                        | during continuous or   |    circuit             |    a fault             |
    |                        | key ON engine OFF self | *  Damaged IMT valve   | -  The DTC indicates   |
    |                        | -test. The test fails  | *  Damaged PCM         |    the PSP sensor is   |
    |                        | when the PCM detects a | *  PSP sensor damaged  |    out of Self-Test    |
    |                        | concern with IMT valve | *  Damaged PCM         |    range.              |
    |                        | output circuit.        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1550 - Power Steering | The PSP sensor input   |                        |                        |
    | Pressure (PSP) Sensor  | signal to PCM is       |                        |                        |
    | Malfunction            | continuously           |                        |                        |
    |                        | monitored. The test    |                        |                        |
    |                        | fails when the signal  |                        |                        |
    |                        | falls out of a maximum |                        |                        |
    |                        | or minimum calibrated  |                        |                        |
    |                        | range.                 |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1605 - Keep Alive     | Indicates the PCM has  | *  Reprogramming       | If KAPWR is            |
    | Memory Test Failure    | experienced an         | *  Battery terminal    | interrupted to the PCM |
    |                        | internal memory test   |    corrosion           | , because of a battery |
    |                        | failure. However there | *  Damaged PCM         | or PCM disconnect, DTC |
    |                        | are external items     | *  KAPWR to PCM        | can be generated on    |
    |                        | that can cause this    |    interrupt/open      | the first power-up.    |
    |                        | DTC.                   | *  Loose battery       |                        |
    |                        |                        |    connection          |                        |
    |________________________|________________________|________________________|________________________|
    | P1633 - Keep Alive     | Indicates that the     | *  Open KAPWR circuit  |                        |
    | Power Voltage Too Low  | Keep Alive Power       | *  Damaged PCM         |                        |
    |                        | (KAPWR) circuit has    | *  Intermittent KAPWR  |                        |
    |                        | experienced a power    |    Circuit             |                        |
    |                        | interrupt.             |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1635 - Tire/Axle      | This Diagnostic        | *  Incorrect tire size | Using the scan tool,   |
    | Ratio Out Of           | Trouble Code (DTC)     | *  Incorrect axle      | view the tire and axle |
    | Acceptable Range       | indicates the tire and |    ratio               | parameters within the  |
    |                        | axle information       | *  Incorrect VID       | VID. They must match   |
    |                        | contained in Vehicle   |    configuration       | vehicle hardware.      |
    |                        | ID block (VID) does    |    parameters          |                        |
    |                        | not match vehicle      |                        |                        |
    |                        | hardware.              |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1640 - Powertrain     | Vehicles using a       | *  DTCs stored in a    | Call-up PID address    |
    | DTC's Available in     | secondary Engine       |    secondary module,   | 0946 to determine      |
    | Another Module         | Control Module can     |    which requested the | secondary module       |
    |                        | request that the       |    MIL to be turned    | requesting MIL         |
    |                        | Powertrain Control     |    on.                 | illumination. Once     |
    |                        | Module illuminate the  |                        | secondary module is    |
    |                        | Check Engine Light     |                        | determined request     |
    |                        | when a failure occurs  |                        | DTCs from module.      |
    |                        | which affect emission. |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1650 - Power Steering | The PSP switch input   | *  PSP switch/shorting | The DTC indicates the  |
    | Pressure (PSP) Switch  | signal to PCM is       |    bar damaged         | PSP switch is out of   |
    | Malfunction            | continuously           | *  SIG RTN circuit     | Self-Test range.       |
    |                        | monitored. The test    |    open                |                        |
    |                        | fails when the signal  | *  PSP circuit open or |                        |
    |                        | falls out of a maximum |    shorted to SIGRTN   |                        |
    |                        | or minimum calibrated  | *  PCM damaged         |                        |
    |                        | range.                 |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1651 - Power Steering | The PSP switch input   | *  PSP switch/shorting | -  The DTC indicates   |
    | Pressure (PSP) Switch  | signal to PCM is       |    bar damaged         |    the PSP switch is   |
    | Signal Malfunction     | continuously           | *  SIG RTN circuit     |    open or shorted     |
    |                        | monitored. The test    |    open                | -  Check for proper    |
    |                        | fails when the signal  | *  PSP circuit open or |    function of         |
    |                        | is open or shorted.    |    shorted to SIGRTN   |    stoplamps. Follow   |
    |                        |                        | *  PCM damaged         |    correct Self-Test   |
    |                        |                        |                        |    procedures, refer   |
    |                        |                        |                        |    to Section 2 Quick  |
    |                        |                        |                        |    Test                |
    |________________________|________________________|________________________|________________________|
    | P1703 - Brake Switch   | Indicates that during  | *  Open or short in    | Check for proper       |
    | Out of Self-Test Range | Key On Engine Off      |    (BPP) circuit       | function of stoplamps. |
    |                        | (KOEO) Self-Test, BPP  | *  Open or short in    | Follow correct Self    |
    |                        | signal was high. Or    |    stoplamp circuits   | -Test procedures,      |
    |                        | during Key On Engine   | *  Damaged PCM         | refer to Section 2     |
    |                        | Running (KOER) Self    | *  Malfunction in      | Quick Test.            |
    |                        | -Test, the BPP signal  |    module(s) connected |                        |
    |                        | did not cycle high and |    to BPP circuit      |                        |
    |                        | low.                   |    (Rear Electronic    |                        |
    |                        |                        |    Module [REM]        |                        |
    |                        |                        |    Windstar and LS6    |                        |
    |                        |                        |    /LS8 and Lighting   |                        |
    |                        |                        |    Control Module      |                        |
    |                        |                        |    (LCM) Continental   |                        |
    |                        |                        |    and Town Car)       |                        |
    |                        |                        | *  Damaged Brake       |                        |
    |                        |                        |    Switch              |                        |
    |                        |                        | *  Misadjusted Brake   |                        |
    |                        |                        |    Switch              |                        |
    |________________________|________________________|________________________|________________________|
    | P1705 - Transmission   |                        |                        |                        |
    | Range Sensor Out of    |                        |                        |                        |
    | Self-Test Range        |                        |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1709 - Park/Neutral   | The DTCs indicate that | *  PNP/CPP circuit     | When exercising either |
    | Position Switch Out of | the voltage is high    |    short to PWR        | the PNP or CPP switch  |
    | Self-Test Range        | when it should be low. | *  Damaged PNP or CPP  | the voltage should     |
    |                        |                        |    switch              | cycle from 5.0V to low |
    |                        |                        | *  PNP/CPP circuit     |                        |
    |                        |                        |    open in the SIGRTN  |                        |
    |                        |                        | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P1729 - 4x4L Switch    | The 4x4L switch is an  | *  4x4L harness open   | Verify the 4x4L switch |
    | Malfunction            | ON/OFF. If the PCM     |    or shorted          | cycles ON/OFF.         |
    |                        | does not see low       | *  Damaged electronic  |                        |
    |                        | voltage when the       |    shift module        |                        |
    |                        | switch is ON a DTC     | *  Damaged PCM         |                        |
    |                        | will set.              |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1780 - Transmission   | During KOER self-test  | *  TCS circuit short   | Verify the TCS switch  |
    | Control Switch Out of  | the TCS has to be      |    or open             | cycles ON/OFF          |
    | Self-Test Range        | cycled, if not cycled  | *  Damaged TCS switch  |                        |
    |                        | a DTC is set.          | *  Damaged PCM         |                        |
    |________________________|________________________|________________________|________________________|
    | P1781 - 4x4L Switch    | The 4x4L switch is an  | *  4x4L harness open   | Verify the 4x4L switch |
    | Out of Self-Test Range | ON/OFF. If the PCM     |    or shorted          | cycles ON/OFF          |
    |                        | does not see low       | *  Damaged electronic  |                        |
    |                        | voltage when the       |    shift module        |                        |
    |                        | switch is on a DTC     | *  Damaged PCM         |                        |
    |                        | will set.              |                        |                        |
    |________________________|________________________|________________________|________________________|
    | P1900 - Output Shaft   | See DTC P0723          |                        |                        |
    | Speed sensor circuit   |                        |                        |                        |
    | intermittent failure   |                        |                        |                        |
    |________________________|________________________|________________________|________________________|

</pre>
 
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