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Emission Test Flunkee
Join Date: Jun 2001
Location: Fairfax, VA
Posts: 2,708
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Re: STICKY ME! DTC Descriptions
HTML Code:
<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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Roush Performance Suspension
Nautilus Performance Stage 3 Turbo Kit 
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