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 | Circuit Affected |
|---|---|
| 12 | Idle Position Switch - High Output |
| 13 | Idle Position Switch - Low Output |
| 14 | Wide Open Throttle Switch - High Output |
| 15 | Wide Open Throttle Switch - Low Output |
| 21 | Vacuum Control Solenoid - High Output |
| 22 | Vacuum Control Solenoid - Low Output |
| 23 | Incorrect Oxygen Sensor Reading |
| 24 | Incorrect Coolant Temperature Switch Reading |
| 25 | RAM Error |