Possible causes – Faulty Ignition/Distributor engine speed sensor– Ignition/Distributor engine speed sensor harness is open or shorted– Ignition/Distributor engine speed sensor circuit poor electrical connection– Faulty Crankshaft Position sensor– Low battery charge– Faulty Engine Control Module (ECM) When is the

Possible causes – Faulty Ignition/Distributor engine speed sensor– Ignition/Distributor engine speed sensor harness is open or shorted– Ignition/Distributor engine speed sensor circuit poor electrical connection– Faulty Crankshaft Position sensor– Low battery charge– Faulty Engine Control Module (ECM) When is the

Possible causes – Faulty injector control relay– Air assist injector solenoid valve harness is open or shorted– Air assist injector solenoid valve circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty injector control relay– Air assist injector solenoid valve harness is open or shorted– Air assist injector solenoid valve circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty injector control relay– Air assist injector solenoid valve harness open or shorted– Air assist injector solenoid valve poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Intake Air Temperature (IAT) sensor– Dirty air filter– Intake Air Temperature (IAT) sensor harness is open or shorted– Intake Air Temperature (IAT) sensor circuit poor electrical connection When is the code detected? – An excessively high

Possible causes – Faulty Intake Air Temperature (IAT) sensor– Dirty air filter– Intake Air Temperature (IAT) sensor harness is open or shorted– Intake Air Temperature (IAT) sensor circuit poor electrical connection When is the code detected? An excessively low or

Possible causes – Faulty Intake Air Temperature (IAT) sensor– Dirty air filter– Intake Air Temperature (IAT) sensor harness is open or shorted– Intake Air Temperature (IAT) sensor circuit poor electrical connection When is the code detected? An excessively low voltage

Possible causes – Faulty Intake Air Temperature sensor– Intake Air Temperature sensor harness is open or shorted– Intake Air Temperature sensor circuit poor electrical connection When is the code detected? The Engine Control Module (ECM) has detected a high voltage

Possible causes – Faulty Intake Air Temperature sensor– Intake Air Temperature sensor harness is open or shorted– Intake Air Temperature sensor circuit poor electrical connection When is the code detected? The Engine Control Module (ECM) has detected a low voltage

Possible causes – Faulty Intake Air Temperature sensor– Intake Air Temperature sensor harness is open or shorted– Intake Air Temperature sensor circuit poor electrical connection When is the code detected? The Engine Control Module (ECM) has detected a performance fault

Possible causes – Faulty intermediate shaft speed sensor– Intermediate shaft speed sensor harness is open or shorted– Intermediate shaft speed sensor circuit poor electrical connection When is the code detected? P0791 code is detected when the input speed sensor voltage

Possible causes – Faulty knock sensor– Knock sensor circuit poor electrical connection– Knock sensor harness is open or shorted– Faulty Engine Control Module (ECM) Tech notes The P0327 code means that the Knock Sensor is not working properly. Problems with

Possible causes – Faulty knock sensor– Knock sensor circuit poor electrical connection– Knock sensor harness is open or shorted– Faulty Engine Control Module (ECM) Tech notes The P0328 code means that the Knock Sensor is not working properly. Problems with

Possible causes – Faulty knock sensor– Knock sensor circuit poor electrical connection– Knock sensor harness is open or shorted– Faulty Engine Control Module (ECM) Tech notes The P0332 code means that the Knock Sensor is not working properly. Problems with

Possible causes – Faulty knock sensor– Knock sensor circuit poor electrical connection– Knock sensor harness is open or shorted– Faulty Engine Control Module (ECM) Tech notes The P0333 code means that the Knock Sensor is not working properly. Problems with

Possible causes – Faulty Low Speed Radiator Fan Relay– Low Speed Radiator Fan Relay harness is open or shorted– Low Speed Radiator Fan Relay circuit poor electrical connection– Faulty Electric Fan– Faulty Engine Control Module (ECM) Symptoms – Engine Light

Possible causes – Faulty Manifold Absolute Pressure sensor– Manifold Absolute Pressure harness is open or shorted– Manifold Absolute Pressure sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) When is the code detected? An excessively low or high voltage

Possible causes – Faulty Manifold Absolute Pressure sensor– Manifold Absolute Pressure harness is open or shorted– Manifold Absolute Pressure sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) When is the code detected? An excessively low or high voltage

Possible causes – Faulty Manifold Absolute Pressure sensor– Manifold Absolute Pressure harness is open or shorted– Manifold Absolute Pressure sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) When is the code detected? An excessively low voltage from the