Diagnostic Trouble Code (DTC) Root Cause & Remedial Action for Omnitek ECM 64A/66A/88A Omnitek Engineering Corp. 1945 S Rancho Santa Fe Rd. San Marcos, CA 92078 Tel. 760-591-0089 - Fax. 760-591-0880 - Copyright 2006 Omnitek Engineering, Corp. All rights reserved.
ECM xx DTC Root Cause & Remedial Actions P0031 1, Heater Low sensor heater control Check oxygen sensor Check oxygen sensor Check oxygen sensor heater control circuit for a heater control wire for a heater control wire for blown fuse. short circuit to ground. an open P0032 1, Heater High sensor heater control Check the oxygen sensor heater control wire for a short circuit to power. P0037 Oxygen Sensor 2, Bank 1, Heater Low sensor heater control Check oxygen sensor Check oxygen sensor Check oxygen sensor heater control circuit for a heater control wire for a heater control wire for blown fuse. short circuit to ground. an open P0038 Oxygen Sensor 2, Bank 1, Heater High sensor heater control Check the oxygen sensor heater control wire for a short circuit to power. P0051 2, Heater Low sensor heater control Check oxygen sensor Check oxygen sensor Check oxygen sensor heater control circuit for a heater control wire for a heater control wire for blown fuse. short circuit to ground. an open P0052 2, Heater High sensor heater control Check the oxygen sensor heater control wire for a short circuit to power. P0057 Oxygen Sensor 2, Bank 2, Heater Low sensor heater control Check oxygen sensor Check oxygen sensor Check oxygen sensor heater control circuit for a heater control wire for a heater control wire for blown fuse. short circuit to ground. an open P0058 P0068 Oxygen Sensor 2, Bank 2, Heater High MAP/MAF/Throttle Position Correlation sensor heater control may indicate a drifted sensor, a contaminated throttle bore, or air leakage after the throttle. Check the oxygen sensor heater control wire for a short circuit to power. Check for contamination in Check for air leakage the throttle bore. after the throttle. Check the MAP sensor and replace as required. Check the MAF sensor and replace as required. Check the TPS sensor and replace as required. P0093 P0094 P0102 P0103 Large Fuel Rail Leak Small Fuel Rail Leak Mass Airflow Sensor Low Mass Airflow Sensor High The fuel rail has a significant leak path either into the engine (injector leakage), or to the atmosphere. The fuel rail has a leak path either into the engine (injector leakage), or to the atmosphere. Problem in the MAF sensor signal Problem in the MAF sensor signal Regulator fuel pressure decays more than 50% in 45 seconds after key off with engine running at key off. Regulator fuel pressure decays more than 20% but less than 50% in 45 seconds after key off with engine running at key off. Check for leaks at all fittings and connections between pressure regulator and injector fuel rail. Check for leaks at all fittings and connection between pressure regulator and injector fuel rail. connection to the MAF for a short to power. Check for proper installation of injectors in the fuel rail. Check for proper installation of injectors in the fuel rail. Check injector o rings for any damage and replace as required. Check injector o rings for any damage and replace as required. circuit for a short toground. Replace MAF sensor signal to ensure it is not disconnected. Replace MAF sensor With the fuel rail installed turn the key on to pressurize the fuel rail and listen for leaks from the With the fuel rail installed turn the key on so to pressurize the fuel rail and listen for leaks from the Page 1 of 19
Manifold Absolute Pressure (MAP) Sensor Problem in the MAP connection to the MAP circuit for a short toground. P0107 Low sensor signal Replace MAP sensor P0108 Manifold Absolute Pressure (MAP) Sensor Problem in the MAP High sensor signal for a short to power. signal to ensure it is not disconnected. Replace MAP sensor P0112 P0113 P0117 P0118 P0122 P0123 Intake Air Temperature Problem in the IAT (IAT) Sensor Low sensor signal Intake Air Temperature Problem in the IAT (IAT) Sensor High sensor signal Engine Coolant Temperature (ECT) Problem in the ECT Sensor Low sensor signal Engine Coolant Temperature (ECT) Sensor High Throttle Position Sensor (TPS) Low Throttle Position Sensor (TPS) High Problem in the ECT sensor signal Problem in the TPS sensor signal Problem in the TPS sensor signal Check the sensor signal wire for a short to ground. Replace IAT Check the sensor signal wire for an open Check the sensor signal wire for a short to ground. Replace ECT Check the sensor signal wire for an open connection to the TPS for a short to power. for a short circuit to power. Replace IAT sensor for a short circuit to power. Replace ECT sensor circuit for a short toground. Replace TPS sensor signal to ensure it is not disconnected. Replace TPS sensor P0125 P0126 Insufficient Coolant Temperature for Closed Loop The engine has not warmed up to a sufficient temperature and may result in reduced catalytic converter activity and/or damage to the oxygen sensor due to exhaust condensation. Insufficient Coolant The minimum coolant Temperature for Stable temperature has not Operation been achieved. Check thermostat Check thermostat Check thermostat for correct temperature rating. Check thermostat for correct temperature rating. Check ECT sensor part number is correct for vehicle and engine model. Check ECT sensor part number is correct for vehicle and engine model. P0127 The intake air charge Intake Air Temperature temperature is above (IAT) Too High safe limits for the engine. Check for correct installation of IAT Check for restrictions in the intake and exhaust system. P0128 P0129 Thermostat Performance Barometric Pressure Too Low This diagnostic can be used to determine if the engine coolant thermostat is capable of controlling the engine Engine coolant temperature to a temperature has not reasonable degree reached 55 degrees C in (within approximately 10 20 minutes of engine degrees C). Problem in the MAP sensor signal Check thermostat connection to the MAP Check thermostat for correct temperature rating. circuit for a short toground. Check ECT sensor part number is correct for vehicle and engine model. Replace MAP sensor Page 2 of 19
Actions Check Oxygen sensor Oxygen sensor voltage is part number with low (<0.2V) during a cold correct version for that soak followed by a keyon vehicle and engine P0131 1, Voltage Low sensor signal cycle. connection to the model. Replace Oxygen P0132 1, Voltage High sensor signal Oxygen sensor voltage is above 1.26 volts. Check the sensor signal wire for short to power. Check Oxygen sensor part number with correct version for that vehicle and engine model. Replace Oxygen P0133 P0134 P0182 P0183 P0192 P0193 P0217 P0219 P0222 P0223 P0234 P0236 P0237 1, Slow Response 1, Inactivity Fuel Temperature Sensor Low Fuel Temperature Sensor High Fuel Pressure Sensor Low Fuel Pressure Sensor High sensor signal sensor signal Problem in the Fuel Temperature sensor signal Problem in the Fuel Temperature sensor signal Problem in the Fuel Pressure sensor signal Problem in the Fuel Pressure sensor signal Engine Coolant Over Problem in the engine Temperature Condition cooling system. Engine speed has exceeded the safe limits Engine Over Speed of Throttle Position Sensor B Low Throttle Position Sensor B High Engine Overboost Condition Boost Pressure Sensor Performance Boost Pressure Sensor Low Problem in the TPS signal Problem in the TPS signal Problem in the turbocharger wastegate control Problem with the Boost Pressure Sensor reading. Problem in the Boost Pressure sensor signal Response time of the oxygen sensor is very slow from expected. Check Oxygen sensor part number with correct version for that vehicle and engine model. Oxygen sensor voltage remains between 0.4 and 0.55 volts for an extended period of time. connection to the Engine coolant temperature has exceeded the safe limits of Check Oxygen sensor part number with correct version for that vehicle and engine model. Check the sensor signal Replace Fuel wire for a short to ground. Temperature Check the sensor signal wire for an open connection to the Fuel Pressure for a short to power. Check coolant level. connection to the TPS. for a short to power. Check the wastegate & wastegate solenoid plumbing. Check if MAP and Boost Pressure Sensor match when engine stopped they should both read atmospheric. connection to the Boost Pressure Replace Oxygen for Replace Fuel a short circuit to power. Temperature sensor circuit for a short toground. Replace Fuel Pressure sensor signal to ensure it is not Replace Fuel Pressure disconnected. sensor Check thermostat Check thermostat temperature rating is correct. circuit for a short toground. Replace TPS. signal to ensure it is not disconnected. Replace TPS. Check wastegate solenoid Replace the sensor which is reading incorrectly. circuit for a short toground. Check for proper preload on wastegate can and verify opening pressure is correct. Replace Boost Pressure sensor Check water pump is functioning. Check for blockage in radiator or hoses. Check for correct cooling fan Page 3 of 19
Problem in the Boost Boost Pressure Sensor Pressure sensor signal for a signal to ensure it is not Replace Boost Pressure P0238 High short to power. disconnected. sensor P0245 P0246 Turbocharger Wastegate Solenoid Circuit Low Turbocharger Wastegate Solenoid Circuit High Problem with the Wastegate solenoid Problem with the Wastegate solenoid Check wiring to the wastegate solenoid. Check wiring to the wastegate solenoid. Check actuator power is available at the wastegate solenoid Check continuity of the connector. solenoid Check actuator power is available at the wastegate solenoid connector. Check continuity of the solenoid P0261 Injector 1 Circuit Low injector connection between the ECM and fuel circuit to ground. control wire for an open control circuit for blown fuse. across the fuel P0262 Injector 1 Circuit High injector circuit to power. across the fuel injector for a short circuit in the injector P0263 Cylinder 1 Contribution/Balance Fuel Balance at Limit Check engine for misfiring on other cylinders. Follow P0300 troubleshooting Check fuel injector flow procedure and leakage P0264 Injector 2 Circuit Low injector connection between the ECM and fuel circuit to ground. control wire for an open control circuit for blown fuse. across the fuel P0265 Injector 2 Circuit High injector circuit to power. across the fuel injector for a short circuit in the injector P0266 Cylinder 2 Contribution/Balance Fuel Balance at Limit Check engine for misfiring on other cylinders. Follow P0300 troubleshooting Check fuel injector flow procedure and leakage P0267 Injector 3 Circuit Low injector connection between the ECM and fuel circuit to ground. control wire for an open control circuit for blown fuse. across the fuel P0268 Injector 3 Circuit High injector circuit to power. across the fuel injector for a short circuit in the injector P0269 Cylinder 3 Contribution/Balance Fuel Balance at Limit Check engine for misfiring on other cylinders. Follow P0300 troubleshooting Check fuel injector flow procedure and leakage P0270 Injector 4 Circuit Low injector connection between the ECM and fuel circuit to ground. control wire for an open control circuit for blown fuse. across the fuel Page 4 of 19
P0271 Injector 4 Circuit High injector circuit to power. across the fuel injector for a short circuit in the injector P0272 Cylinder 4 Contribution/Balance Fuel Balance at Limit Check engine for misfiring on other cylinders. Follow P0300 troubleshooting Check fuel injector flow procedure and leakage P0273 Injector 5 Circuit Low injector connection between the ECM and fuel circuit to ground. control wire for an open control circuit for blown fuse. across the fuel P0274 Injector 5 Circuit High injector circuit to power. across the fuel injector for a short circuit in the injector P0275 Cylinder 5 Contribution/Balance Fuel Balance at Limit Check engine for misfiring on other cylinders. Follow P0300 troubleshooting Check fuel injector flow procedure and leakage P0276 Injector 6 Circuit Low injector connection between the ECM and fuel circuit to ground. control wire for an open control circuit for blown fuse. across the fuel P0277 Injector 6 Circuit High injector circuit to power. across the fuel injector for a short circuit in the injector P0278 Cylinder 6 Contribution/Balance Fuel Balance at Limit Check engine for misfiring on other cylinders. Follow P0300 troubleshooting Check fuel injector flow procedure and leakage P0279 Injector 7 Circuit Low injector connection between the ECM and fuel circuit to ground. control wire for an open control circuit for blown fuse. across the fuel P0280 Injector 7 Circuit High injector circuit to power. across the fuel injector for a short circuit in the injector P0281 Cylinder 7 Contribution/Balance Fuel Balance at Limit Check engine for misfiring on other cylinders. Follow P0300 troubleshooting Check fuel injector flow procedure and leakage P0282 Injector 8 Circuit Low injector connection between the ECM and fuel circuit to ground. control wire for an open control circuit for blown fuse. across the fuel Page 5 of 19
P0283 Injector 8 Circuit High injector circuit to power. across the fuel injector for a short circuit in the injector P0284 P0297 P0300 Cylinder 8 Contribution/Balance Vehicle Over Speed Engine Misfire Detected P0301 Misfire, Cylinder 1 P0302 Misfire, Cylinder 2 P0303 Misfire, Cylinder 3 P0304 Misfire, Cylinder 4 P0305 Misfire, Cylinder 5 P0306 Misfire, Cylinder 6 P0307 Misfire, Cylinder 7 P0308 Misfire, Cylinder 8 P0313 P0314 Misfire Detected with Low Fuel Fuel Balance at Limit. Vehicle speed has exceeded the safe limits of Tampering of Road Speed Limiter. Check engine for misfiring on other cylinders. Follow P0300 troubleshooting Check fuel injector flow procedure and leakage Check for signs of tampering on vehicle speed sensor wiring. Multiple cylinders appear to be misfiring. Check spark plugs. Check spark plug wires. Cylinder 1 appears to be missing significantly more than other cylinders. Check spark plugs. Check spark plug wires. Cylinder 2 appears to be missing significantly more than other cylinders. Check spark plugs. Check spark plug wires. Cylinder 3 appears to be missing significantly more than other cylinders. Check spark plugs. Check spark plug wires. Cylinder 4 appears to be missing significantly more than other cylinders. Check spark plugs. Check spark plug wires. Cylinder 5 appears to be missing significantly more than other cylinders. Check spark plugs. Check spark plug wires. Cylinder 6 appears to be missing significantly more than other cylinders. Check spark plugs. Check spark plug wires. Cylinder 7 appears to be missing significantly more than other cylinders. Check spark plugs. Check spark plug wires. Cylinder 8 appears to be missing significantly more than other cylinders. Check spark plugs. Check spark plug wires. If the fuel storage system has a low quantity, this DTC is set to indicate that the misfire was likely due to operator error. Check fuel storage tank pressure and confirm proper Single Cylinder Misfire Multiple cylinders appear (Cylinder not Specified) to be misfiring. Check spark plugs. Check spark plug wires. coils. coils. coils. coils. coils. coils. coils. coils. coils. coils. Check engine cylinder Check engine cylinder Check engine cylinder Check engine cylinder Check engine cylinder Check engine cylinder Check engine cylinder Check engine cylinder Check engine cylinder Check engine cylinder Page 6 of 19
Idle the engine and lightly tap the engine block with a hammer while monitoring the knock channels with a Problem with the Knock Check wiring to the knock scantool or diagnostic Replace the knock P0327 Knock Sensor 1 Low sensor software. P0328 P0332 Knock Sensor 1 High Knock Sensor 2 Low Problem with the Knock sensor Problem with the Knock sensor Idle the engine. If there is excessive engine sounds coming from the engine or auxiliary items, repair the engine first. Check wiring to the knock Disconnect the knock sensor, with the engine idling. The knock level should be very low (below 0.05). If it is high, check the sensor wiring for proper shielding and grounding. Replace the Idle the engine and lightly tap the engine block with a hammer while monitoring the knock channels with a scantool or diagnostic Replace the knock software. If no other problems found, replace the ECM. P0333 P0335 P0340 P0363 P0462 P0463 P0502 Knock Sensor 2 High Crankshaft Position (CKP) Sensor Circuit Fault Camshaft Position (CMP) Sensor Fault Misfire Detected Fuelling Disabled Fuel Quantity Sensor Low Fuel Quantity Sensor High Vehicle Speed Sensor (VSS) Low Problem with the Knock sensor Problem with the CKP Idle the engine. If there is excessive engine sounds coming from the engine or auxiliary items, repair the engine first. At least five CMP transitions and no engine speed signal received connection to the No CMP signal is received within 60 crankshaft revolutions Disconnect the knock sensor, with the engine idling. The knock level should be very low (below 0.05). If it is high, check the sensor wiring for proper shielding and grounding. Check sensor to trigger wheel gap is correct. Check sensor is receiving correct 5V sensor power. Replace the Check shield of cables is intact to prevent electrical noise from entering signal. Problem with the CMP connection to the Check sensor to trigger wheel gap is correct. Multiple cylinders appear to be misfiring. Check spark plugs. Check spark plug wires. coils. Problem in the fuel quantity sensor signal connection to the fuel circuit for a short toground. Replace fuel quantity quantity sensor Problem in the fuel quantity sensor signal Problem in the VSS sensor signal Road speed limiter tampering. for a short to power. connection to the signal to ensure it is not Replace fuel quantity disconnected. sensor circuit for a short toground or short to power. Check if speedometer on gauge cluster is operational. If no other problems found, replace the ECM. Check resistance of the Check shield of cables is intact to prevent electrical noise from entering signal. Replace Check sensor for damage by removing and inspecting sensing pole. Check resistance of the Check sensor for damage by removing and inspecting sensing pole. Check cylinder Page 7 of 19
Vehicle Speed Sensor (VSS) "A" circuit for a short toground Check if speedometer on Intermittent/Erratic/Hi Problem in the VSS Road speed limiter or short to gauge cluster is P0503 gh sensor signal tampering. connection to the power. operational. Replace P0506 Idle Air Control (IAC) System RPM Too Low IAC is not able to control idle speed. It may be caused by poor fuel control or a sticking IAC. Check for other DTC codes related to fuel control, Ignition control or misfire and correct those first. connection to the IAC motor. Check for open circuit between ECM and IAC. Check IAC functionality by removing IAC and performing a Key On/Key Off cycle IAC should fully extend and retract to its home position. Replace IAC stepper motor. P0507 P0508 P0509 P0522 P0523 P0524 P0545 P0546 Idle Air Control (IAC) System RPM Too High Idle Air Control (IAC) Circuit Low Idle Speed Control (IAC) Circuit High Engine Oil Pressure Sensor Low Engine Oil Pressure Sensor High Engine Oil Pressure Low Exhaust Temperature Sensor Low Exhaust Temperature Sensor High IAC is not able to control idle speed. Problem with the IAC Problem with the IAC Problem in the Oil Pressure sensor signal Problem in the Oil Pressure sensor signal Engine oil pressure is to low for safe engine Problem in the Exhaust Temperature sensor signal Problem in the Exhaust Temperature sensor signal This may be caused by an air leak, a sticking throttle, a sticking throttle cable or a sticking IAC. Check for an air leak after the throttle such as any gaskets or ports on the intake manifold such as vacuum ports, injectors ports, sensor ports etc. Check for proper throttle opening and closing I.e. no sticking of throttle. connection to the IAC motor. circuit for a short to ground. circuit Check the control circuit for IAC wire to wire for a short to power. shorts. connection to the Oil circuit for a short toground. Pressure for a short to power. Check engine oil level. Check throttle stop position has not been tampered with. Check IAC motor resistance. Check IAC motor resistance. Replace Oil Pressure sensor signal to ensure it is not Replace Oil Pressure disconnected. sensor Check for clogged oil filter. Check the sensor signal Replace Exhaust wire for a short to ground. Temperature Check the sensor signal wire for an open Verify engine oil pressure. for Replace Exhaust a short circuit to power. Temperature sensor Check for a sticking throttle cable. Replace IAC motor. Replace IAC motor. Check IAC functionality by removing IAC and performing a Key On/Key Off cycle IAC should fully extend and retract to its home position. Replace IAC stepper motor. P0561 P0562 System Voltage Unstable System Voltage Low Problem with charging system. Problem with charging system. Charging system voltage is varying excessively. Charging system or battery is unable to maintain a nominal system voltage. Check all grounds harness, engine and vehicle. Check all grounds harness, engine and vehicle. Check battery voltage. Check battery voltage. Check alternator output at a raised engine speed of 1200 RPM. DC voltage should be between 13.5 and 15.0 volts. AC voltage should be below Check fluid level of 1V. battery. Check alternator output at a raised engine speed of 1200 RPM. Check fluid level of battery. Check for corrosion at battery posts. Check for corrosion at battery posts. Check fluid level in battery and correct as required. Check fluid level in battery and correct as required. Page 8 of 19
P0563 System Voltage High Problem with charging system. This fault indicates that the charging system or battery is unable to maintain a nominal system voltage. Check alternator output at Check all grounds a raised engine speed of harness, engine and 1200 RPM. vehicle. Check fluid level of battery. Check for corrosion at battery posts. Check fluid level in battery and correct as required. P0603 P0604 P0605 P0606 Erase the fault code, turn off the ECM for at least fifteen minutes and see if it reappears when the key is turned back on. The time delay is needed to ensure that the ECM uses the stored information from EEPROM and not the Keep Alive Memory Fault There is no saved EEPROM data. same data located in temporary memory (RAM). circuit for ECM constant battery power. Internal Control Module Random Access Memory (RAM) Error Problem with ECM RAM. Replace ECM. Internal Control Module Read Only Memory (ROM) Error ECM Fault Reprogram ECM with Blank or corrupted operating program. correct calibration/firmware file. ECM did not pass functional test during manufacturing. Boot ROM is corrupt. Replace ECM. P0610 P0616 Control Module Vehicle Options Error Starter Relay Circuit Low Vehicle speed limit has not been programmed A problem with the starter relay control Factory/dealer speed limit needs to be programmed. Check starter relay function by turning Key to Start position. The relay should make an audible "click" when Check for a blown fuse. active. connection to relay. Check for low system voltage while engine running at the battery, alternator and ECM actuator power input pin. P0617 Starter Relay Circuit High A problem with the starter relay control Check starter relay Check for high system function by turning Key to voltage while engine ON position. The relay running at the battery, should make an audible alternator and ECM and "click" when active. power input pin. P0622 Alternator Field Current Monitor Fault Problem with the vehicle alternator. Check wiring of the signal for open or short circuits. Check alternator for proper Check battery for proper A discharged battery that requires the alternator to operate at full field may cause this fault. Clear the DTC after battery is charged and check if DTC reappears. Page 9 of 19
P0638 Throttle Control Performance Desired and actual throttle positions do not match. With key on, verify free motion of the throttle plate by depressing the accelerator pedal slowly then releasing it slowly. The throttle plate will follow the accelerator pedal position. If the throttle makes strange noises, or sticks, the Ensure that there are no throttle body overhanging gaskets, assembly should be which may occasionally checked for binding, catch the throttle foreign material, or debris. plate. Replace throttle body. P0642 Sensor Reference Voltage A Low Problem with 5 volt connection at ECM for Check for sensor power supply circuit shorts to ground. Check for shorts in end devices by disconnecting all sensors using 5 volt and connecting back one at a time. P0643 Sensor Reference Voltage A High Problem with 5 volt connection at ECM for Check for sensor power supply circuit shorts to key power or battery power. Check for shorts in end devices by disconnecting all sensors using 5 volt and connecting back one at a time. P0646 A/C Clutch Relay Control Circuit Low A problem with the AC clutch relay control Check for a blown fuse. Check clutch relay function by turning AC on. The relay should make an audible "click" when active. connection to relay. Replace relay. P0647 P0650 A/C Clutch Relay Control Circuit High Malfunction Indicator Lamp (MIL) Circuit Fault A problem with the AC clutch relay control Problem with the MIL Check clutch relay function by turning AC relay on with scan tool. The relay Check wiring harness should make an audible and fuses to A/C "click" when active. system. Check if the rest of the instrument cluster is operational. Check wiring connection to lamp. Replace relay. Check for continuity between ECM and lamp connection. Check for signal wire short to ground. P0652 Sensor Reference Voltage B Low Problem with 5 volt connection at ECM for Check for sensor power supply circuit shorts to ground. Check for shorts in end devices by disconnecting all sensors using 5 volt and connecting back one at a time. Page 10 of 19
ECM xx DTC Root Cause & Remedial Actions P0653 Sensor Reference Voltage B High Problem with 5 volt connection at ECM for Check for sensor power supply circuit shorts to key power or battery power. Check for shorts in end devices by disconnecting all sensors using 5 volt and connecting back one at a time. P0654 P0655 P0656 Engine RPM Output Circuit Engine Stop/Overheat Lamp Circuit Fault Fuel Level Output Circuit Fault Problem with engine RPM output/tachometer Problem with the stop/overheat lamp gauge driver Check if the rest of the instrument cluster is operational. Check if the rest of the instrument cluster is operational. Check if the rest of the instrument cluster is operational. Check for continuity Check wiring connection between ECM and gauge Check for signal wire to gauge. connection. short to ground. Check for continuity Check wiring connection to lamp. Check wiring connection to gauge. between ECM and lamp connection. Check for continuity between ECM and gauge connection. Check for signal wire short to ground. Check for signal wire short to ground. Replace instrument cluster. Replace instrument cluster. Replace instrument cluster. P0658 P0659 Actuator Power Voltage Low Actuator Power Voltage High The actuator power supply is lower than expected. The actuator power supply is higher than expected. Check for a blown fuse. Check actuator power relay function by turning Key to ON position. The relay should make an audible "click" when active. Check actuator power relay function by turning Key to ON position. The relay should make an audible "click" when active. Check for high system voltage while engine running at the battery, alternator and ECM actuator power input pin. connection between ECM and relay. Check for voltage at the injector with engine off. If present, check electrical wiring and relay for proper function. Replace relay. Check for low system voltage while engine running at the battery, alternator and ECM actuator power input pin. Replace relay. P0686 Power Control Relay Circuit Low Problem with the power control relay Problem with the power control relay. Check for a blown fuse. Check power control relay function by turning Key to ON position. The relay should make an audible "click" when active. connection to relay. Check for low system voltage while engine running at the battery, alternator and ECM actuator power input pin. P0687 P0689 P0690 Power Control Relay Circuit High ECM/PCM Power Relay Sense Circuit Low ECM/PCM Power Relay Sense Circuit High Problem with the power control relay Problem with the power control relay feedback Problem with the power control relay feedback Problem with the power control relay. Check power control relay function by turning Key to ON position. The relay should make an audible "click" when active. Check for high system voltage while engine running at the battery, alternator and ECM and power input pin. Replace relay. connection between ECM Check for shorts circuits and relay. to ground. connection between ECM and relay. Check for shorts circuits to power. P0691 Fan 1 Relay Control Circuit Low Problem with the Fan relay control Problem with the Fan control relay. Check for a blown fuse. Check fan control relay function by grounding fan control signal. The relay should make an audible "click" when active and the Fan should turn on. connection between ECM and relay. Replace relay. Page 11 of 19
P0692 Fan 1 Relay Control Circuit High Problem with the Fan relay control Problem with the Fan control relay. Check fan control relay function by grounding fan control signal. The relay should make an audible "click" when active and the Fan should turn on. Replace relay. P0693 Fan 2 Relay Control Circuit Low Problem with the Fan relay control Problem with the Fan control relay. Check for a blown fuse. Check fan control relay function by grounding fan control signal. The relay should make an audible "click" when active and the Fan should turn on. connection between ECM and relay. Replace relay. P0694 Fan 2 Relay Control Circuit High Problem with the Fan relay control Problem with the Fan control relay. Check fan control relay function by grounding fan control signal. The relay should make an audible "click" when active and the Fan should turn on. Replace relay. P0698 Sensor Reference Voltage C Low Problem with 5 volt connection at ECM for Check for sensor power supply circuit shorts to ground. Check for shorts in end devices by disconnecting all sensors using 5 volt and connecting back one at a time. P0699 P1134 P1135 P1136 Sensor Reference Voltage C High 1, Erratic Air Fuel Ratio Problem with 5 volt This diagnostic checks the response time of the lambda sensor to a change in the oxygen sensor voltage. This diagnostic checks the response time of the lambda sensor to a 1, Oxygen Sensor Lean change in the oxygen Shift sensor voltage. 1, Oxygen Sensor Rich Shift This diagnostic checks the response time of the lambda sensor to a change in the oxygen sensor voltage. connection at ECM for Check for exhaust leaks between the engine and O2 Check for exhaust leaks between the engine and O2 Check integrity of the wiring and electrical connection to the Check for sensor power supply circuit shorts to key power or battery power. Check for intake manifold leaks. Check for intake manifold leaks. Check for shorts in end devices by disconnecting all sensors using 5 volt and connecting back one at a time. Check O2 sensor is installed securely. Check O2 sensor is installed securely. Check harness grounds. Check integrity of the wiring and electrical connection to the Check harness grounds. Check integrity of the wiring and electrical connection to the Check harness grounds. P1137 1, Oxygen Sensor High Impedance Oxygen sensor performance has degraded. Replace Oxygen Page 12 of 19
P1138 1, Oxygen Sensor Overheat Condition Oxygen sensor tip temperature has exceeded the safe limit. Check for degraded oxygen Check for a short circuit in the heater control Check for signs of excessive exhaust temperatures. Replace the P1131 1, Oxygen Sensor High Problem with the oxygen Impedance sensor signal This test attempts to determine if an oxygen sensor has degraded by measuring its circuit impedance. Check integrity of the wiring and electrical connection to the Check harness grounds. P1517 Backup TPS Data Does Not Match The backup and primary span data differ by an excessive amount. Check throttle for proper smooth motion. If throttle motion and control is adequate, Check throttle for debris perform manual throttle or overhanging gaskets zero process using scan impeding movement. tool. P1518 Unable to Complete Throttle Zero Process ECM was not able to do a throttle span after keyoff. Troubleshoot and repair any faults first. Troubleshoot and repair any TPS faults first. Check throttle for proper motion, and for debris or overhanging gaskets using the procedure found in DTC P0638. Check for proper throttle position voltage readings. If throttle motion and control is adequate, perform manual throttle zero process using scan tool and check if DTC reappears. P1519 No Backup TPS Zero Data Found Only one copy of span data in EEPROM is found when there should be two. This indication is normal on a new ECM installation. Clear DTC s if the throttle is working normally. Check battery backup power for proper operation it must not be disconnected from the battery during ECM power down or throttle span. P1520 No Primary TPS Zero Data Found Only one copy of span data in EEPROM is found when there should be two. This indication is normal on a new ECM installation. Clear DTC s if the throttle is working normally. Check battery backup power for proper operation it must not be disconnected from the battery during ECM power down or throttle span. P1521 Throttle Resting Position Incorrect The rest position of throttle does not match expected. Troubleshoot and repair any faults first. Troubleshoot and repair any TPS faults first. Check throttle for proper motion, and for debris or overhanging gaskets using the procedure found in DTC P0638. Check for proper throttle position voltage readings. If throttle motion and control is adequate, perform manual throttle zero process using scan tool. P1522 Throttle Resting After spanning the Position Incorrect After resting positions have Span failed to match. Troubleshoot and repair any faults first. Troubleshoot and repair any TPS faults first. Check throttle for proper motion, and for debris or overhanging gaskets using the procedure found in DTC P0638. Check for proper throttle position voltage readings. If throttle motion and control is adequate, perform manual throttle zero process using scan tool. Page 13 of 19
P1630 Electronic Throttle Driver Overheat The throttle driver temperature has exceeded the safe operating limits. With the throttle motor disconnected, verify throttle moves smoothly and without excessive force required. Check throttle for binding. Check the placement of the ECM to ensure it is not getting overheated. P1631 Electronic Throttle Driver Overheat The throttle driver temperature has exceeded the safe operating limits. With the throttle motor disconnected, verify throttle moves smoothly and without excessive force required. Check throttle for binding. Check the placement of the ECM to ensure it is not getting overheated. P1632 Electronic Throttle Driver Overheat Shutdown The throttle driver temperature has exceeded the safe operating limits and. With the throttle motor disconnected, verify throttle moves smoothly and without excessive force required. Check throttle for binding. Check the placement of the ECM to ensure it is not getting overheated. P1633 P1656 P1690 Electronic Throttle Driver Overvoltage Shutdown Low Fuel Lamp Circuit Fault Maintenance Reminder This fault indicates that the charging system or battery has allowed an Throttle driver indicates overvoltage of over 30 that a voltage above 30V volts to disable the has occurred. throttle driver IC. Problem with the low fuel lamp Fuel use total exceeds a maintenance limit Check alternator output at a raised engine speed of 1200 RPM. Check if the rest of the instrument cluster is operational. Do scheduled maintenance on fuel system. Check all grounds harness, engine and vehicle. Check fluid level of battery. Check wiring connection If an incandescent lamp to lamp. is used replace lamp. Check for corrosion at battery posts. Check for continuity between ECM and lamp connection. Check fluid level in battery and correct as required. Check for signal wire short to ground. Replace instrument cluster. P2100 P2102 P2103 P2111 P2112 Throttle Actuator Control Motor Circuit Open Throttle Actuator Control Motor Circuit Low Throttle Actuator Control Motor Circuit High Throttle Stuck Open Throttle Stuck Closed Open circuit in throttle control motor circuit detected. Short circuit across throttle control motor or to ground. Short circuit across throttle control motor or to power. Throttle is stuck open and does not move. Throttle is stuck closed and does not move. Check wiring to throttle motor. Check wiring to motor. Check wiring to motor. Check throttle for ice or blockage. Check throttle for ice or blockage. Check throttle motor for continuity. If open, replace throttle body. Check motor for short circuits. Check motor for short circuits. With the throttle motor disconnected, verify throttle moves smoothly and without excessive force required. Check throttle for binding. With the throttle motor disconnected, verify throttle moves smoothly and without excessive force required. Check throttle for binding. Page 14 of 19
Accelerator Pedal Problem in the APP signal circuit for a short toground. Replace accelerator P2122 Position Sensor D Low connection to the APP. pedal. P2123 P2127 P2128 P2132 P2133 P2135 P2138 P2139 P2140 Accelerator Pedal Problem in the APP signal Position Sensor D High Accelerator Pedal Position Sensor E Low Problem in the APP signal Accelerator Pedal Problem in the APP signal Position Sensor E High Accelerator Pedal Position Sensor F Low Accelerator Pedal Position Sensor F High Problem in the APP signal Problem in the APP signal Throttle Position Throttle position sensors Sensor A B Correlation do not match. Accelerator Pedal Position Sensor D E Correlation Accelerator Pedal Position Sensor D F Correlation Accelerator Pedal Position Sensor E F Correlation Accelerator pedal sensors do not match. Accelerator pedal sensors do not match. Accelerator pedal sensors do not match. for a short to power. connection to the APP. for a short to power. connection to the APP. for a short to power. Check throttle position sensor voltage while manually moving the throttle plate. Check throttle position sensor voltages while slowly depressing the accelerator pedal. Check throttle position sensor voltages while slowly depressing the accelerator pedal. Check throttle position sensor voltages while slowly depressing the accelerator pedal. signal to ensure it is not Replace accelerator disconnected. pedal. circuit for a short toground. Replace accelerator pedal. signal to ensure it is not Replace accelerator disconnected. pedal. circuit for a short toground. Replace accelerator pedal. signal to ensure it is not Replace accelerator disconnected. pedal. Check wiring to throttle body. Check wiring to accelerator pedal. Check wiring to accelerator pedal. Check wiring to accelerator pedal. Replace throttle body. Replace accelerator pedal. Replace accelerator pedal. Replace accelerator pedal. P2177 Fuel System Too Lean off Idle, Bank 1 Problem with closed loop feedback control. If the adaptive fuel trim in the off idle region is attempting to add as much fuel as the programmed maximum value (typically around 15%), this DTC will indicate this problem. Check for exhaust leaks between the engine and O2 Check for intake manifold leaks. Check O2 sensor is installed securely. Check CNG particulate Check integrity of the filter and coalescing filter wiring and electrical Check pressure setting of for excess contaminants connection to the the regulator. that may restrict flow. P2178 Fuel System Too Rich off Idle, Bank 1 If the adaptive fuel trim in the off idle region is attempting to subtract as much fuel as the programmed minimum value (typically around Problem with closed loop 15%), this DTC will feedback control. indicate this problem. Check for leaking Check regulator outlet pressure. Check for exhaust restrictions. Page 15 of 19
P2187 Fuel System Too Lean at Idle, Bank 1 Problem with closed loop feedback control. If the adaptive fuel trim in the idle region is attempting to add as much fuel as the programmed maximum value (typically around 15%), this DTC will indicate this problem. Check for exhaust leaks between the engine and O2 Check for intake manifold leaks. Check O2 sensor is installed securely. Check integrity of the wiring and electrical Check pressure setting of Check coalescing filter connection to the the regulator. for oil. Check injectors for proper flow. P2188 Fuel System Too Rich at Idle, Bank 1 If the adaptive fuel trim in the idle region is attempting to subtract as much fuel as the programmed minimum value (typically around Problem with closed loop 15%), this DTC will feedback control. indicate this problem. Check for leaking Check regulator outlet pressure. Check for exhaust restrictions. P2191 Fuel System Too Lean At High Load, Bank 1 Problem with closed loop feedback control. If the adaptive fuel trim in the high load region is attempting to add as much fuel as the programmed maximum value (typically around 15%), this DTC will indicate this problem. Check for exhaust leaks between the engine and O2 Check for intake manifold leaks. Check O2 sensor is installed securely. Check CNG particulate Check integrity of the filter and coalescing filter wiring and electrical Check pressure setting of for excess contaminants connection to the the regulator. that may restrict flow. P2192 Fuel System Too Rich At High Load, Bank 1 If the adaptive fuel trim in the high load region is attempting to subtract as much fuel as the programmed minimum value (typically around Problem with closed loop 15%), this DTC will feedback control. indicate this problem. Check for leaking Check regulator outlet pressure. Check for exhaust restrictions. P2195 O2 Sensor Signal Stuck Lean Problem with closed loop feedback control. If the voltage remains low but still in range, this DTC will set. Check for exhaust leaks. Check for a single cylinder misfire which would introduce excessive oxygen in the Check regulator outlet exhaust. pressure. P2196 P2231 P2243 O2 Sensor Signal Stuck Rich 1, Shorted to Heater If the oxygen sensor signal is likely valid but Problem with closed loop reading rich continually, feedback control. this DTC will set. Check for leaking Oxygen sensor signal voltage toggles when heater control output Check wiring to oxygen also toggles. sensor UEGO interface circuit Oxygen Sensor indicates reference Reference Circuit, Bank circuit is shorted or 1, Sensor 1 overloaded. Check wiring to oxygen sensor Check intake for restrictions such as clogged filter. Check regulator outlet pressure. Check for exhaust restrictions. Page 16 of 19
P2262 P2263 Turbo pressure Boost Pressure Mechanical Turbo pressure Boost Pressure System Performance No boost pressure detected. Insufficient boost pressure detected. Check boost pressure sensor connection. Check boost pressure sensor connection. Check air ducting for secure connections. Check air ducting for secure connections. Check turbocharger for seizing. Check turbocharger for seizing. P2297 1, Signal Stuck Rich During Deceleration Some types of contamination or circuit failures can cause the sensor to read rich when the fuel is supposed to be off. Silicone contamination of the oxygen sensor or a leaking injector will cause a rich indication without fuel. Check for leaking Replace O2 Ensure that any sealants used on the engine are oxygen sensor safe. P2299 P2300 Accelerator Pedal Position and Brake Switch Incompatible Ignition Coil 1 Circuit Primary Low Current Accelerator pedal depressed while brake pedal is also depressed. Ignition current did not reach 2 amps during dwell on time. Check operation of Check for burned out accelerator pedal. brake light bulbs. the ignition Check operation of brake switch input to the ECM. Check for driver abuse. Replace ignition P2301 P2302 P2303 P2304 P2305 P2306 Ignition Coil 1 Circuit Primary High Current Ignition Coil 1 Circuit Secondary Fault Ignition Coil 2 Circuit Primary Low Current Ignition Coil 2 Circuit Primary High Current Ignition Coil 2 Circuit Secondary Fault Ignition Coil 3 Circuit Primary Low Current Ignition current exceeded 9.5 amps during dwell on time. A misfire fault without a corresponding ignition system fault is an No spark detected by the indication of this type of Check for disconnected ECM. problem. sparkplug wire at the sparkplug. Ignition current did not reach 2 amps during dwell on time. Check key power voltage. If key power voltage at ECM is lower than voltage at ignition coil, this DTC will set. Check for disconnected sparkplug wire at the the ignition Ignition current exceeded 9.5 amps during dwell on time. A misfire fault without a corresponding ignition system fault is an No spark detected by the indication of this type of Check for disconnected ECM. problem. sparkplug wire at the sparkplug. Ignition current did not reach 2 amps during dwell on time. Check key power voltage. If key power voltage at ECM is lower than voltage at ignition coil, this DTC will set. Check for disconnected sparkplug wire at the the ignition the ignition Replace ignition Check sparkplug wire for continuity. Replace sparkplugs. Replace ignition Replace ignition the ignition Replace ignition Check sparkplug wire for continuity. Replace sparkplugs. Replace ignition Replace ignition P2307 Ignition Coil 3 Circuit Primary High Current Ignition current exceeded 9.5 amps during dwell on time. Check key power voltage. If key power voltage at ECM is lower than voltage at ignition coil, this DTC will set. the ignition Replace ignition Page 17 of 19
A misfire fault without a corresponding ignition system fault is an Check for disconnected Ignition Coil 3 Circuit No spark detected by the indication of this type of Check for disconnected sparkplug wire at the Check sparkplug wire for P2308 Secondary Fault ECM. problem. sparkplug wire at the sparkplug. continuity. Replace sparkplugs. Replace ignition Ignition current did not Ignition Coil 4 Circuit reach 2 amps during P2309 Primary Low Current dwell on time. the ignition Replace ignition P2310 P2311 P2312 P2313 P2314 P2315 P2316 P2317 P2318 Ignition Coil 4 Circuit Primary High Current Ignition Coil 4 Circuit Secondary Fault Ignition Coil 5 Circuit Primary Low Current Ignition Coil 5 Circuit Primary High Current Ignition Coil 5 Circuit Secondary Fault Ignition Coil 6 Circuit Primary Low Current Ignition Coil 6 Circuit Primary High Current Ignition Coil 6 Circuit Secondary Fault Ignition Coil 7 Circuit Primary Low Current Ignition current exceeded 9.5 amps during dwell on time. A misfire fault without a corresponding ignition system fault is an No spark detected by the indication of this type of Check for disconnected ECM. problem. sparkplug wire at the sparkplug. Ignition current did not reach 2 amps during dwell on time. Check key power voltage. If key power voltage at ECM is lower than voltage at ignition coil, this DTC will set. Check for disconnected sparkplug wire at the the ignition Ignition current exceeded 9.5 amps during dwell on time. A misfire fault without a corresponding ignition system fault is an No spark detected by the indication of this type of Check for disconnected ECM. problem. sparkplug wire at the sparkplug. Ignition current did not reach 2 amps during dwell on time. Check key power voltage. If key power voltage at ECM is lower than voltage at ignition coil, this DTC will set. Check for disconnected sparkplug wire at the the ignition Check key power voltage. If key power voltage at ECM is lower than voltage at ignition coil, this DTC will set. Ignition current exceeded 9.5 amps during dwell on time. A misfire fault without a corresponding ignition system fault is an No spark detected by the indication of this type of Check for disconnected ECM. problem. sparkplug wire at the sparkplug. Ignition current did not reach 2 amps during dwell on time. Check for disconnected sparkplug wire at the the ignition the ignition Replace ignition Check sparkplug wire for continuity. Replace sparkplugs. Replace ignition Replace ignition the ignition Replace ignition Check sparkplug wire for continuity. Replace sparkplugs. Replace ignition Replace ignition the ignition Replace ignition Check sparkplug wire for continuity. Replace sparkplugs. Replace ignition Replace ignition P2319 Ignition Coil 7 Circuit Primary High Current Ignition current exceeded 9.5 amps during dwell on time. Check key power voltage. If key power voltage at ECM is lower than voltage at ignition coil, this DTC will set. the ignition Replace ignition Page 18 of 19
A misfire fault without a corresponding ignition system fault is an Check for disconnected Ignition Coil 7 Circuit No spark detected by the indication of this type of Check for disconnected sparkplug wire at the Check sparkplug wire for P2320 Secondary Fault ECM. problem. sparkplug wire at the sparkplug. continuity. Replace sparkplugs. Replace ignition Ignition current did not Ignition Coil 8 Circuit reach 2 amps during P2321 Primary Low Current dwell on time. the ignition Replace ignition P2322 P2323 P2336 P2337 P2338 P2339 P2340 P2341 P2342 P2343 P2428 P2560 P2626 Ignition Coil 8 Circuit Primary High Current Ignition Coil 8 Circuit Secondary Fault Cylinder 1 Above Knock Threshold Cylinder 2 Above Knock Threshold Cylinder 3 Above Knock Threshold Cylinder 4 Above Knock Threshold Cylinder 5 Above Knock Threshold Cylinder 6 Above Knock Threshold Cylinder 7 Above Knock Threshold Cylinder 8 Above Knock Threshold Exhaust Overheat Engine Coolant Level Low 1, Trim Circuit Open Ignition current exceeded 9.5 amps during dwell on time. A misfire fault without a corresponding ignition system fault is an No spark detected by the indication of this type of ECM. problem. ECM detects excessive engine knock on cylinder 1 ECM detects excessive engine knock on cylinder 2 ECM detects excessive engine knock on cylinder 3 ECM detects excessive engine knock on cylinder 4 ECM detects excessive engine knock on cylinder 5 ECM detects excessive engine knock on cylinder 6 ECM detects excessive engine knock on cylinder 7 ECM detects excessive engine knock on cylinder 8 ECM detects excessive exhaust temperature. ECM detects low coolant level. UEGO interface circuit detects incorrect pumping current. Check key power voltage. If key power voltage at ECM is lower than voltage at ignition coil, this DTC will set. Check for disconnected Check for disconnected sparkplug wire at the sparkplug wire at the sparkplug. Check for mechanical noise from engine. Check for mechanical noise from engine. Check for mechanical noise from engine. Check for mechanical noise from engine. Check for mechanical noise from engine. Check for mechanical noise from engine. Check for mechanical noise from engine. Check for mechanical noise from engine. Check for fuel system restriction. Coolant level is low. Fill cooling system. Check wiring to oxygen sensor the ignition Check for detonation under high load Check fuel quality. Check for detonation under high load Check fuel quality. Check for detonation under high load Check fuel quality. Check for detonation under high load Check fuel quality. Check for detonation under high load Check fuel quality. Check for detonation under high load Check fuel quality. Check for detonation under high load Check fuel quality. Check for detonation under high load Check fuel quality. Check ignition timing for proper sensor location Check for exhaust and wiring. restrictions. Check wiring to coolant level switch. Replace ignition Check sparkplug wire for continuity. Replace sparkplugs. Replace ignition Page 19 of 19