ECM Trouble Code Id
ECM TROUBLE CODE IDENTIFICATION
| Trouble Code |
Circuit Malfunction |
| 12 |
No distributor reference pulse to ECM |
| 13 |
Oxygen sensor circuit |
| 14 |
Shorted coolant sensor circuit |
| 15 |
Open coolant sensor circuit |
| 21 |
Throttle position sensor circuit |
| 23 |
Open or grounded M/C solenoid circuit |
| 24 |
Vehicle speed sensor |
| 34 |
Vacuum sensor circuit |
| 41 |
No distributor reference pulses at specified engine vacuum |
| 42 |
EST or EST bypass circuit grounded or open |
| 44 |
Lean oxygen sensor value |
| 44 & 45 |
Faulty oxygen sensor circuit |
| 45 |
Rich oxygen sensor value |
| 51 |
Faulty PROM or improper PROM installation |
| 54 |
Shorted M/C or faulty ECM |
| 55 |
Grounded voltage reference, high voltage on oxygen sensor circuit or ECM |