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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. | | |
|________________________|________________________|________________________|________________________|
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