Code Identification

CODE IDENTIFICATION

Code No.

System Affected

Probable Cause

12 & 13

RPM Signal

Distributor Or Circuit, Starter Circuit, ECU

Ignition Signal

Ignitor Or Circuit To ECU, ECU

Oxygen Sensor Signal

Oxygen Sensor Or Circuit, Oxygen Sensor Heater, ECU

Coolant Temp. Sensor Signal

Coolant Temp. Sensor Or Circuit, ECU

24 ⁽¹⁾

Intake Air Temperature Sensor Signal

Intake Air Temperature Sensor Or Circuit, ECU

Lean Air/Fuel Mixture

Injector Or Circuit, Oxygen Sensor Or Circuit, Fuel Pressure, Ignition System, Coolant Temp. Sensor, Airflow Meter, ECU

Rich Air/Fuel Mixture

Airflow Meter, ECU, Injector Or Circuit, Oxygen Sensor Or Circuit, Fuel Pressure, Cold Start Injector Or Circuit, Coolant Temp. Sensor

Airflow Meter Signal

Airflow Meter Or Circuit, ECU

32 ⁽²⁾

Airflow Meter Signal

Airflow Meter Or Circuit, ECU

35 ⁽³⁾

High Altitude Compensator

ECU

41 ⁽¹⁾

Throttle Position Sensor Signal

Throttle Position Sensor Or Circuit, ECU

42 ⁽⁴⁾

Vehicle Speed Sensor Signal

Vehicle Speed Sensor Or Circuit, ECU

43 ⁽⁴⁾

Starter Signal

Starter Signal Circuit, Ignition Switch Or Circuit, Main Relay, ECU

51 ⁽⁴⁾

Switch Condition Signal

A/C Switch Circuit, ECU, Neutral/Start Switch Or Circuit, TPS Or Circuit

Knock Sensor Signal

Knock Sensor Or Circuit, ECU

Knock Sensor Control (ECU)

ECU

71 ⁽⁵⁾

EGR System Malfunction

EGR System, EGR Temp. Sensor Or Circuit, ECU, EGR VSV

⁽¹⁾	CHECK ENGINE light comes on when code is set on Calif. only.

⁽²⁾	Used on V6 models only.

⁽³⁾	Used on V6 Pickup cab and chassis models only.

⁽⁴⁾	CHECK ENGINE light will not come on when code is set.

⁽⁵⁾	Used on Calif. only.