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1991-1995 Jeep Wrangler (YJ)
Trouble Codes
Code Probable Cause
11 Ignition
13 Manifold Absolute Pressure (MAP) Sensor Vacuum
14 Manifold Absolute Pressure (MAP) Sensor Electrical
15 Distance sensor or circuit
17 Engine running too cool
21 Oxygen sensor or circuit
22 Coolant temperature sensor or circuit
23 MAT sensor or circuit
24 Throttle Position Sensor (TPS) sensor or circuit
25 Automatic Idle Speed (AIS) circuit
27 Fuel injector control
31 EVAP solenoid or circuit
33 Air conditioning clutch relay
41 Alternator field
42 Automatic shutdown relay
44 Battery temperature sensor
46 Battery over voltage
47 Battery under voltage
51 Oxygen sensor - lean condition
52 Oxygen sensor - rich condition
53 Internal engine controller fault
54 Distributor sync pickup
55 End of Code output
62 Emissions Maintenance Reminder (EMR) mileage accumulator
63 Controller failure EEPROM write denied
The diagnostic trouble codes on all models can be extracted from the
Powertrain Control Module (PCM) using a SCAN tool. On 1991 through
1995 models only, the PCM can be placed in the diagnostic mode and
the trouble codes flashed on the Check Engine light.
The PCM will illuminate the CHECK ENGINE light on the dash if it
recognizes a fault in the system. The light will remain lit until the
problem is repaired and the code cleared or the PCM does not detect
any malfunction for several consecutive drive cycles.
To extract the diagnostic trouble codes, perform the following steps:
1. Without starting the engine, turn the ignition key ON, OFF, ON,
OFF and ON. The CHECK ENGINE light on the dash will begin to
flash.
2. If any trouble codes are stored in the PCM memory, the CHECK
ENGINE light will flash the number of the first digit, pause and
flash the number of the second digit. For example, Code 23, air
temperature sensor circuit would be indicated by two flashes,
pause three flashes. A long pause will appear between
individual codes if more than one code is present. Carefully
observe the flashes and record the exact code number(s) onto
paper.
3. After the stored codes have been indicated (or if everything in
the self diagnosis system is functioning properly), the CHECK
ENGINE light will flash a Code 55.
4. If the ignition key is turned OFF during the code extraction
process and possibly turned back ON, the self diagnostic
system will automatically invalidate the procedure and must be
restarted.