Trouble Code Definition

TROUBLE CODE IDENTIFICATION

Code

System Affected

Probable Cause

System Normal

Heated Oxygen Sensor

Sensor Or Circuit, ECM

⁽¹⁾ Engine Coolant Temp. (ECT) Sensor

Sensor Or Circuit, ECM

⁽²⁾ Engine Coolant Temp. (ECT) Sensor

Sensor Or Circuit, ECM

⁽³⁾ Throttle Position (TP) Sensor

Sensor Or Circuit, ECM

⁽⁴⁾ Throttle Position (TP) Sensor

Sensor Or Circuit, ECM

Vehicle Speed Sensor

Sensor Or Circuit, ECM

33 ⁽⁵⁾

⁽³⁾ MAF Sensor

Sensor Or Circuit, ECM

34 ⁽⁵⁾

⁽⁴⁾ MAF Sensor

Sensor Or Circuit, ECM

41 ⁽⁶⁾

Ignition Signal Circuit

Ignition Coil, Ignitor, Wiring Circuit, ECM

42 ⁽⁷⁾

Crank Angle Sensor

Sensor, Wiring, ECM

44 ⁽⁷⁾

Idle Switch Circuit Open

TP Sensor, Wiring, ECM

Idle Switch Circuit Shorted

TP Sensor, Wiring, ECM

51 ⁽⁸⁾

EGR System

ECM, EGR, Modulator, Wiring, EGR Temp. Sensor, Vacuum Switching Valve

52 ⁽⁵⁾⁽⁸⁾

Fuel System

Injectors, ECM

⁽¹⁾	Low temperature is indicated.

⁽²⁾	High temperature is indicated.

⁽³⁾	High voltage is indicated.

⁽⁴⁾	Low voltage is indicated.

⁽⁵⁾	MFI/SFI only.

⁽⁶⁾	Code 41 is not stored in ECM memory. To check code when engine fails to start, crank engine, and then, with ignition still on, install fuse in diagnostic terminal of fuse block.

⁽⁷⁾	When code occurs, ECM will not activate CHECK ENGINE light while engine is running. When problem is fixed, memory of defective area will automatically be erased from ECM.

⁽⁸⁾	California emission models only.