Trouble Codes
The ECM stores component failure information under a related trouble code which can be recalled for diagnosis and repair. When recalled, these codes will be displayed by flashes of the "CHECK ENGINE" lamp. Codes start with lowest numbered code. Only codes in which a related malfunction has occurred will be displayed.
NOTE:
An example of trouble codes is as follows: "FLASH", "FLASH", pause, "FLASH", "FLASH", "FLASH" followed by a longer pause identifies trouble code 23. First series of flashes indicates first digit of trouble code. Second series of flashes indicates second digit of trouble code.
ECM TROUBLE CODE IDENTIFICATION
| Code | Problem | ||||
|---|---|---|---|---|---|
| 12 (1) | No Ignition Reference Pulse to ECM | ||||
| 13 | Oxygen Sensor Circuit | ||||
| 14 | Shorted Coolant Sensor Circuit | ||||
| 15 | Open Coolant Sensor Circuit | ||||
| 21 | Idle Switch Circuit Open or WOT Switch Circuit Shorted | ||||
| 22 | Fuel Cut Solenoid Circuit Open or Grounded | ||||
| 23 | M/C Solenoid Circuit Open or Grounded | ||||
| 25 | Air Switching Solenoid Circuit Open or Grounded | ||||
| 31 (2) | No Ignition Reference Pulse to ECM at Part Throttle, Under Road Load | ||||
| 44 | Lean Oxygen Sensor Indication | ||||
| 45 | Rich System Indication | ||||
| 51 | Shorted Fuel Cut Solenoid Circuit and/or Faulty ECM | ||||
| 52 | Faulty ECM (RAM Problem in ECM) | ||||
| 53 | Shorted Air Switching Solenoid and/or Faulty ECM | ||||
| 54 | Shorted M/C Solenoid and/or Faulty ECM | ||||
| 55 | Faulty ECM (A/D Converter in ECM) | ||||
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