Trouble Code Id Chart
ECM TROUBLE CODE IDENTIFICATION
| Code | Circuit Affected |
|---|---|
| 12 | No reference pulses to ECM |
| 13 | Oxygen Sensor Circuit |
| 14 | Coolant sensor circuit shorted/low voltage |
| 15 | Coolant sensor circuit open/high voltage |
| 21 | Throttle position sensor circuit open/low voltage |
| 23 | Open or grounded M/C solenoid circuit |
| 24 | Vehicle speed sensor circuit |
| 32 | BARO sensor circuit low |
| 34 | MAP-vacuum sensor circuit voltage wrong/low |
| 35 | ISC switch circuit shorted |
| 41 | No dist. ref. pulse at specified vacuum |
| 42 | EST by-pass circuit grounded/open Or ESC retard signal too long |
| 43 | Voltage At ECM Too Low |
| 44 | Lean oxygen sensor indication |
| 44 & 45 | At same time, faulty oxygen sensor |
| 45 | Rich oxygen sensor indication |
| 51 | Faulty PROM or improper PROM installation |
| 54 | Shorted M/C solenoid or faulty ECM |
| 55 | Grounded +8 volts, voltage reference, faulty oxygen sensor or ECM |