Error Codes from Service Engine Light
Q: How can I display the error codes from a Service Engine Light?
A: If your car does not have the 12 pin DLC connector, you may not be able to manually "flash" your trouble codes. The language "may be possible" appears to suggest that this method should work with most, if not all, 12 pin DLC equipped cars.
THE CONNECTOR
———————–
| 1 2 3 4 5 6 |
| 7 8 9 10 11 12 |
———————–
DISPLAYING THE TROUBLE CODES
Run a wire/hairpin from Pin 6 to Pin 12 with the ignition off (although on later cars it should be from Pin 5 to Pin 6), then turning the ignition to the on position without starting the engine will flash the "Service Engine Soon" light in the following sequence: flash, pause, flash-flash, long pause flash, pause, flash-flash, long pause flash, pause, flash-flash, long pause Following this "12" code repeating three times will come any trouble codes stored, flashing each of them three times. If you do not see the "12" flash three times, your diagnostic circuit is defective. Some vehicles will display stored trouble codes, then "12" again, followed by energizing "most system controlled relays." The fuel pump relay will not energize. The idle air control valve will fully extend to enable checking minimum idle speed.
CLEARING THE TROUBLE CODES
Turn the keyswitch to the off position. To clear any trouble codes, disconnect the power feed for 30 seconds. If this is done at the battery, and your car stereo is equipped and programmed with a four digit pin code, you may have to re-enter that as well to use your stereo again. A better place to remove power is at the fuse.
TROUBLE CODES
| 12. | No reference pulses to Electronic Control Module (ECM). |
| 13. | Oxygen sensor signal stays lean during warm engine cruise |
| 14. | High temperature indicated at engine coolant temp sensor |
| 15. | Low temperature indicated at engine coolant temp sensor |
| 16. | High battery voltage OR Direct inition system open or shorted to ground |
| 17. | RPM signal problem |
| 18-20. | N/A |
| 21. | High voltage at throttle positon sensor |
| 22. | Low voltage at throttle positon sensor OR Fuel cutoff relay circuit open or shorted to ground |
| 23. | Low temperature at manifold air temperature sensor OR Throttle position sensor error |
| 24. | Circuit fault in vehicle speed sensor |
| 25. | High temperature at manifold air temperature sensor OR Vacuum switching valve circuit open or shorted to ground OR High voltage at ATS sensor |
| 26. | Fault in quad driver module |
| 27. | Fault in 2nd gear switch |
| 28. | Fault in 3rd gear switch |
| 29. | Fault in 4th gear switch |
| 30. | N/A |
| 31. | Low voltage at manifold absolute pressure sensor OR Fuel injector OR Park or neutral switch OR CAM diagnostic OR Governor malfunction OR Wastegate overboost OR Wastegate eletrical signal open or shorted to ground |
| 32. | Fault in barometric pressure sensor circuit OR Fault in exhaust gas recirculation valve diagnostic switch OR Fault in electronic vacuum regulator valve |
| 33. | High voltage (low vacuum) at mass air flow sensor (or MAP sensor) |
| 34. | Low voltage (high vacuum) at mass air flow sensor (or MAP sensor) |
| 35. | Idle speed can not be set to desired RPM |
| 36. | Burn off at mass air flow sensor OR Problem in transmission shift OR Fault in direct ignition system OR Missing pulses in electronic spark timing signal |
| 37. | N/A |
| 38. | Fault in torque converter clutch brake switch |
| 39. | Fault in torque converter clutch circuit |
| 40. | N/A |
| 41. | Fault at cam sensor OR Cylinder select error OR Tach input error |
| 42. | Fault at electronic spark timing circuit OR Fault at direct ignition system OR Fault at fuel cutoff relay circuit |
| 43. | Low voltage at electronic spark timing circuit |
| 44. | Oxygen sensor lean |
| 45. | Oxygen sensor rich |
| 46. | Fault at vehicle anti-theft sytem OR Fault at power steering switch |
| 47. | Problem at Electronic Control Module (ECM) |
| 48. | Misfire |
| 49. | Vacuum leak |
| 50. | N/A |
| 51. | PROM error |
| 52. | Problem at Electronic Control Module (ECM) – Missing fuel calpac missing OR Analog to digital converter error OR Fault at quad driver module OR Low voltage at oil temperature sensor |
| 53. | High voltage at battery OR High voltage at exhaust gas recirculation valve OR Voltage reference error OR Problem at vehicle anti-theft system |
| 54. | Low voltage at fuel pump OR Low voltage at Fuel pump relay OR Output failure at quad driver module |
| 55. | Problem at Electronic Control Module (ECM) – ECM failure OR Serial bus error OR Fuel lean malfunction |
| 56. | Low coolant or corrosivity OR Fault in port throttle system vacuum sensor |
| 57. | N/A |
| 58. | Problem at vehicle anti-theft system |
| 59-60. | N/A |
| 61. | Oxygen sensor degraded OR Port throttle system error OR Cruise control problems |
| 62. | Gear switch input diagnostics OR High voltage at oil temperature sensor OR Fault in cruise control- vacuum solenoid circuit |
| 63. | High voltage at manifold absolute pressure sensor OR Fault in exhaust gas recirculation valve OR Fault at right oxygen sensor |
| 64. | Low voltage at manifold absolute pressure sensor OR Fault in exhaust gas recirculation valve OR Right oxygen sensor lean |
| 65. | Failure at exhaust gas recirculation valve OR Faulure at injector peak/hold diagnostic OR Right oxygen sensor rich OR Fault at cruise control position sensor |
| 66. | Internal reset of Electronic Control Module (ECM) |
| 67. | Fault at cruise control switch |
| 68. | Fault at cruise control switch |
| 69. | Fault at air conditioner pressure switch |
| 70-87. | N/A |
| 88. | Internal reset of Electronic Control Module (ECM) |