Trouble Code Definition

TROUBLE CODE IDENTIFICATION

Code

System Affected

Probable Cause

CODE 13

Heated Oxygen Sensor Circuit

Sensor Or Circuit, ECM

CODE 14

⁽¹⁾ Engine Coolant Temperature (Ect) Sensor, Low Temperature Indicated

Sensor Or Circuit, ECM

CODE 15

⁽²⁾ Engine Coolant Temperature (ECT) Sensor, High Temperature Indicated

Sensor Or Circuit, ECM

CODE 21

⁽³⁾ Throttle Position Sensor Circuit, Signal Voltage High

Sensor Or Circuit, ECM

CODE 22

⁽⁴⁾ Throttle Position Sensor Circuit, Signal Voltage Low

Sensor Or Circuit, ECM

CODE 23 ⁽⁵⁾

⁽¹⁾ Intake Air Temperature (IAT) Sensor Circuit, Low Temperature Indicated

Sensor Or Circuit, ECM

CODE 24

Vehicle Speed Sensor

Sensor Or Circuit, ECM

CODE 25 ⁽⁵⁾

⁽²⁾ Intake Air Temperature (IAT) Sensor Circuit, High Temperature Indicated

Sensor Or Circuit, ECM

CODE 31 ⁽⁵⁾

⁽³⁾ Manifold Absolute Pressure (MAP) Sensor Circuit, Signal Voltage High

Sensor Or Circuit, ECM

CODE 32 ⁽⁵⁾

⁽⁴⁾ Manifold Absolute Pressure (MAP) Sensor Circuit, Signal Voltage Low

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

CODE 45

Idle Switch Circuit Shorted Or Misadjusted

TP Sensor, Wiring, ECM

CODE 51 ⁽⁸⁾

EGR System Circuit Check - Calif.

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

CODE 53 ⁽⁵⁾⁽⁸⁾

ECM Ground Circuit Check - Calif.

Wiring, ECM

⁽¹⁾	Low temperature is indicated.

⁽²⁾	High temperature is indicated.

⁽³⁾	High voltage is indicated.

⁽⁴⁾	Low voltage is indicated.

⁽⁵⁾

TBI 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.