FixVault

Diagnostic Code Identification

DIAGNOSTIC CODE IDENTIFICATION (1)(2)

CODE No. System Affected NORMAL MODE TEST MODE Probable Cause
12  RPM Signal ON N/A Distributor, Starter or Ckt, ECM
13  RPM Signal ON ON Distributor or Ckt, ECM
14  Ignition Signal ON N/A Ignitor or Ckt to ECM. ECM
16  Elect. Controlled A/T Signal ON N/A ECM or Ckt
21  O2 Sensor Signal ON (3) O2 Sensor/Heater or Ckt, ECM
22  Coolant Temp. Sensor Signal ON ON Coolant Temp. Sensor or Ckt, ECM
24  Intake Air Temp. Sensor Signal ON (4) ON Intake Air Temp. Sensor or Ckt, ECM
25  Lean Air/Fuel Mixture ON ON Loose Ground, Injector or Ckt, Fuel Pressure, Ignition System, Coolant Temp. Sensor,Airflow Meter, Vacuum Sensor,O2 Sensor or Ckt, CompressionPressure, ECM
26  Rich Air/Fuel Mixture ON 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  Airflow Meter ON ON Airflow Meter or Ckt, ECM
32  Airflow Meter ON ON Airflow Meter or Ckt, ECM
35  BARO Sensor Signal ON ON ECM
41  TPS Signal ON (4) ON Throttle Position Sensor or Ckt, ECM
42  Vehicle Speed Sensor Signal ON OFF Vehicle Speed Sensor or Ckt, ECM
43  Starter Signal N/A OFF Starter Signal Ckt, Main Relay, Ignition Switch or Ckt, ECM
51  Switch Condition Signal N/A OFF A/C Switch, Park/Neutral Switch or Ckt, TPS or Ckt, ECM
52  Knock Sensor Signal ON N/A Knock Sensor or Ckt, ECM
53  Knock Control Signal ON N/A ECM
71 (5) EGR System Malfunction ON ON EGR System, EGR Temp. Sensor or Ckt, EGR-VSV, ECM
(1) Only Normal Mode is used on 2.4L models. Both modes are used on 3.0L models. Information in Test Mode only applies to 3.0L models.
(2) ON indicates MIL on instrument panel will be illuminated. N/A indicates item is not included in malfunction diagnosis when using this mode. OFF indicates MIL on instrument panel will be not be illuminated even if malfunction is detected.
(3) The MIL will be illuminated if problem exists in oxygen sensor circuit on all models except Pickup 2WD California models. On all models, MIL will not be illuminated if problem exists in oxygen sensor heater or circuit.
(4) The MIL will be illuminated on Calif. models only.
(5) Applies to California models only.