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Autodata - Diagnostic Trouble Codes Fault locations and probable causes - 2004 edition

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I Engine management<br />

General information<br />

Refer to the front of this manual for general test conditions,<br />

terminology, detailed descriptions of wiring faults <strong>and</strong> a<br />

general trouble shooter for electrical <strong>and</strong> mechanical faults.<br />

0 No digital trouble codes available from vehicle manufacturer.<br />

Accessing <strong>and</strong> erasing<br />

The engine control module (ECM) fault memory can only be<br />

accessed <strong>and</strong> erased using diagnostic equipment able to<br />

display fault <strong>locations</strong> as a text description.<br />

<strong>Trouble</strong> code identification<br />

<strong>Fault</strong> location<br />

Probable cause<br />

AC signal<br />

Air conditioning relay - circuit malfunction<br />

Camshaft position (CMP) actuator - circuit malfunction<br />

Camshaft position (CMP) sensor - circuit malfunction<br />

Crankshaft position (CKP) sensorlengine speed (RPM)<br />

sensor - malfunction<br />

Engine control module (ECM) - defective<br />

Engine control relay<br />

Engine coolant temperature (ECT) sensor - openlshort circuit<br />

Evaporative emission (EVAP) canister purge valve - circuit<br />

malfunction<br />

Exhaust gas recirculation (EGR) solenoid<br />

Fuel pump relay<br />

Wiring, AC system, AC control module<br />

Wiring, supply voltage, AC system<br />

Wiring, CMP actuator relay, CMP actuator, ECM<br />

Wiring, CMP sensor, ECM<br />

1 Wiring, air gap, CKPIRPM sensor, mechanical fault, ECM<br />

I ECM<br />

Wiring, supply voltage, engine control relay<br />

Wiring, ECT sensor, ECM<br />

Heated oxygen sensor (H02S) 1 Wiring, H02S, air leak, ECM<br />

Idle air control (IAC) valve [ Wiring, IAC valve, ECM<br />

Idle speed control (ISC) actuatorlthrottle motor<br />

Idle control - outside specification<br />

Ignition coils<br />

Wiring, supply voltage, EVAP canister purge valve, ECM<br />

Wiring, supply voltage, EGR solenoid, ECM<br />

Wiring, supply voltage, fuel pump relay<br />

Wiring, ISC actuatorlthrottle motor, mechanical fault, ECM<br />

Intake leaklblockage, throttle valve tightlsticking,<br />

IAC valve or ISC actuator, ECM<br />

Wiring, supply voltage, ignition coil, ECM<br />

Ignition switch - circuit malfunction<br />

Wiring, supply voltage, ignition switch<br />

Immobilizer circuit - malfunction<br />

I Wiring, immobilizer defective, ECM<br />

Injector 1 1 Wiring, fuse, engine control relay, injector<br />

lnjector 2<br />

I Wiring, fuse, engine control relay, injector<br />

Injector 3<br />

I Wiring, fuse, engine control relay, injector<br />

Injector 4<br />

Wiring, fuse, engine control relay, injector<br />

Wiring, IAT sensor, ECM<br />

El Intake air temperature (IAT) sensor - openlshort circuit<br />

Intake manifold air control solenoid - circuit malfunction<br />

Knock sensor (KS)<br />

Wiring, intake manifold air control solenoid, ECM<br />

Wiring, KS, KS incorrectly tightened, ECM

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