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Trouble Code Identification

TROUBLE CODE IDENTIFICATION (1)(2)

CODE No. System Affected MIL inNORMAL MODE MIL in TEST MODE Probable Cause
12  RPM Signal ON - Distributor, Starter or Ckt, ECM
13  RPM Signal ON - Distributor or Ckt, ECM
14  Ignition Signal ON - Ignitor or Ckt to ECM. ECM
21  O2 Sensor Signal ON - O2 Sensor or Ckt, ECM
22  Coolant Temp. Sensor Signal ON - Coolant Temp. Sensor or Ckt, ECM
24  Intake Air Temp. Sensor Signal ON (3) - Intake Air Temp. Sensor or Ckt, ECM
25  Lean Air/Fuel Mixture ON - Loose Ground, Injector or Ckt, Fuel Pressure, Ignition System, Coolant Temp. Sensor,Airflow Meter, Vacuum Sensor,O2 Sensor or Ckt, CompressionPressure, ECM
26 (3) Rich Air/Fuel Mixture ON - Loose Ground, Injector or Ckt, Fuel Pressure, Ignition System, Coolant Temp. Sensor,Airflow Meter, Vacuum Sensor,O2 Sensor or Ckt, Cold Start Injector or Ckt, Compression Pressure, ECM
31  Vacuum Sensor Signal ON - Vacuum Sensor or Ckt, ECM
41  TPS Signal ON (3) - Throttle Position Sensor or Ckt, ECM
42  Vehicle Speed Sensor Signal OFF - Vehicle Speed Sensor or Ckt, ECM
43  Starter Signal OFF - Starter Signal Ckt, Main Relay, Ignition Switch or Ckt, ECM
51  Switch Condition Signal OFF - A/C Switch, Park/Neutral Switch or Ckt, TPS or Ckt, ECM
71 (4) EGR System Malfunction ON - EGR System, EGR Temp. Sensor or Ckt, EGR-VSV, ECM
(1) ON indicates MIL on instrument panel will be illuminated. OFF indicates MIL on instrument panel will be not be illuminated even if malfunction is detected.
(2) Test mode is not used on this vehicle.
(3) The MIL will be illuminated on California models only.
(4) Applies to California models only.
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