Trouble Code Identification
Check engine light will go on approximately 10 seconds after the ECM recognizes a problem. If malfunction clears, check engine light will go out and trouble code will be set in ECM. Code 53 will clear only after key is turned off. Code 12 does not store in memory.
If check engine light goes on intermittently, and does not store any codes after key is turned off and engine is restarted, see INTERMITTENT CHECK ENGINE LIGHT in TROUBLE SHOOTING section of this article.
ECM TROUBLE CODE IDENTIFICATION
| Code | Circuit Affected |
|---|---|
| 12 | No Engine RPM signal while cranking. |
| 14 | Low coolant sensor signal voltage. |
| 15 | High coolant sensor signal voltage. |
| 21 | Low MVS signal voltage. |
| 22 | High MVS signal voltage. |
| 24 | Low VSS signal. |
| 41 | No engine RPM signal (vehicle in motion). |
| 51 | Faulty PROM. |
| 53 | EGR control error. |
| 55 | Low "V-Ref." voltage. |