Diagnostic Trouble Codes - 1993
Jeep
| 11 | IGN reference signal. |
| 13 | Fault in the map sensor pneumatic circuit. |
| 14 | Fault in the map sensor electrical circuit. |
| 15 | Fault in the vehicle speed sensor circuit. |
| 17 | Engine running too cool. |
| 21 | Problem in the oxygen feedback circuit. |
| 22 | Fault in the coolant temperature sensor circuit. |
| 23 | Air temperature sensor. |
| 24 | Fault in the throttle position sensor circuit. |
| 25 | Fault in the IAC motor drive circuit. |
| 27 | Fault in injector driver interface circuit. |
| 31 | Purge solenoid circuit. |
| 33 | Fault in air conditioning cutout relay circuit. |
| 34 | S/C solenoid circuits. |
| 35 | Fault in fan relay circuit. |
| 41 | Fault in the charging system or no field current. |
| 42 | Fault in the ASD relay driver circuit. |
| 43 | Fault in ignition coil control circuit. |
| 44 | Battery Temp Voltage. |
| 46 | Battery voltage is too high. |
| 47 | Battery voltage is too low. |
| 51 | Lean condition is indicated. |
| 52 | Rich condition is indicated. |
| 53 | Internal problem in module. |
| 54 | Fault in the distributor high data rate pickup circuit. |
| 55 | Completion of fault code display. |
| 62 | Unsuccessful attempt to update EMR mileage. |
| 63 | Unsuccessful attempt to write to an EEPROM location by the controller. |
| 76 | Fuel pump resistor by-pass relay circuit |
Extracting Fault Codes:
Turn the ignition switch ON, OFF, ON, OFF, ON and observe the CHECK ENGINE LIGHT. The CHECK ENGINE LIGHT should begin to flash a series of codes. The flashes will be separated by short an long pauses. The long pauses separate the "ones" and "tens" positions, and each code from the next. A code 55 will be displayed at the end of the test.
