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ECM Trouble Code Identification
ECM TROUBLE CODE IDENTIFICATION
| Code |
Circuit Affected |
| 12 |
No Reference Pulse |
| 13 |
Oxygen sensor circuit |
| 14 |
Shorted coolant sensor circuit |
| 15 |
Open coolant sensor circuit |
| 21 |
TPS signal voltage high |
| 23 |
M/C solenoid circuit open or grounded |
| 34 |
Vacuum sensor circuit |
| 41 |
No distributor reference pulses |
| 42 |
EST circuit |
| 44 |
Lean oxygen sensor value |
| 45 |
Rich oxygen sensor value |
| 51 |
Faulty PROM, PROM installation or ECM |
| 54 |
Shorted M/C solenoid or faulty ECM |
| 55 |
Faulty ECM (4.1L only) |