Trouble Code Definition

TROUBLE CODE IDENTIFICATION

Code

System Affected

Probable Cause

Heated Oxygen Sensor Circuit

Sensor Or Circuit, ECM

⁽¹⁾ Engine Coolant Temperature (ECT) Sensor

Sensor Or Circuit, ECM

⁽²⁾ Engine Coolant Temperature (ECT) Sensor

Sensor Or Circuit, ECM

⁽³⁾ Throttle Position Sensor Circuit

Sensor Or Circuit, ECM

⁽⁴⁾ Throttle Position Sensor Circuit

⁽³⁾ Intake Air Temperature Sensor Circuit

Sensor Or Circuit, ECM

Vehicle Speed Sensor

Wiring Circuit, ECM, VSS

⁽⁴⁾ Intake Air Temperature Sensor Circuit

Sensor Or Circuit, ECM, IAT

CODE 33 ⁽⁵⁾

⁽³⁾ Mass Airflow (MAF) Sensor Circuit

Sensor Or Circuit, ECM

CODE 34 ⁽⁵⁾

⁽⁴⁾ Mass Airflow (MAF) Sensor Circuit

Sensor Or Circuit, ECM

CODE 41 ⁽⁶⁾

No Ignition Signal

Ignition Coil, Ignitor, Wiring Circuit, ECM

CODE 42 ⁽⁷⁾

Crank Angle Sensor

Sensor, Wiring, ECM

CODE 44 ⁽⁷⁾

Idle Switch Circuit Open Or Misadjusted

TP Sensor, Wiring, ECM

Idle Switch Circuit Shorted Or Misadjusted

TP Sensor, Wiring, ECM

CODE 51 ⁽⁸⁾

EGR System Circuit Check

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

CODE 52 ⁽⁵⁾⁽⁸⁾

Fuel System Check - Fuel Injector Leakage

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.