Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1991 Jeep Cherokee LimitedFACTORY OEM SERVICE PROCEDURE
Fault Code Table
FAULT CODE
| Code | Display On DRB-II (1) | Fault Condition | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 11 | IGN REFERENCE SIGNAL | No Distributor Reference Signal Detected During Cranking | ||||||||
| 13(2)(3) | SLOW CHANGE IN MAP SIGNAL | No Difference In MAP Sensor Signal Is Detected | ||||||||
| 13 | NO CHANGE IN MAP FROM START TO RUN | No Difference Detected Between MAP & Barometric Pressure Readings | ||||||||
| 14(2)(3) | MAP VOLTAGE TOO LOW | MAP Sensor Input Below Minimum Acceptable Voltage | ||||||||
| 14 | MAP VOLTAGE TOO HIGH | MAP Sensor Input Above Maximum Acceptable Voltage | ||||||||
| 15(3) | NO VEHICLE SPEED SIGNAL | No Distance Sensor Signal Detected With Road Load Conditions | ||||||||
| 17 | ENGINE IS COLD TOO LONG | Coolant Temp. Stays Below Normal Operating Temp. During Vehicle Operation | ||||||||
| 21(3) | O2 SIGNAL STAYS AT CENTER | Neither Rich Nor Lean Condition Is Detected From Oxygen Sensor Input | ||||||||
| 21 | O2 SENSOR SHORTED TO VOLTAGE | O2 Sensor Input Voltage Maintained Above Normal Operating Range | ||||||||
| 22(2)(3) | COOLANT SENSOR VOLTAGE TOO LOW | Coolant Temp. Sensor Input Below Minimum Acceptable Voltage | ||||||||
| 22 | COOLANT SENSOR VOLTAGE TOO HIGH | Coolant Temp. Sensor Input Above Maximum Acceptable Voltage | ||||||||
| 23(2)(3) | CHARGE TEMP SENSOR VOLTAGE LOW | Charge Temp. Sensor Input Below Minimum Acceptable Voltage | ||||||||
| 23 | CHARGE TEMP SENSOR VOLTAGE HIGH | Charge Temp. Sensor Input Above Maximum Acceptable Voltage | ||||||||
| 24(2)(3) | TPS VOLTAGE LOW | TPS Sensor Output Less Than Minimum Acceptable Voltage | ||||||||
| 24 | TPS VOLTAGE HIGH | TPS Sensor Output More Than Maximum Acceptable Voltage | ||||||||
| 25(3) | AUTOMATIC IDLE SPEED MOTOR CIRCUITS | Short/Open Circuit Detected In One Or More Automatic Idle Speed (AIS) Motor Circuits | ||||||||
| 27(2)(3) | INJECTOR (#) CONTROL CIRCUIT | Injector (Number) Output Driver Does Not Respond Correctly To SBEC Control Signal | ||||||||
| 33 | A/C CLUTCH RELAY CIRCUIT | Open/Short Condition Detected In A/C Clutch Relay Circuit | ||||||||
| 34(4) | SPEED CONTROL SOLENOID CIRCUITS | Open/Short Condition Detected In Speed (Cruise) Control Vacuum Or Vent Solenoid Circuits | ||||||||
| 35(4) | RADIATOR FAN RELAY | Open Or Shorted Condition Detected In Radiator Fan Relay Circuit | ||||||||
| 41(2)(3) | ALTERNATOR FIELD NOT SWITCHING PROPERLY | Open/Short Condition Detected In Alternator Field Circuit | ||||||||
| 42 | ASD RELAY CIRCUIT | Open/Short Condition Detected In ASD Relay Circuit | ||||||||
| 42 | NO ASD RELAY VOLTAGE SENSED AT CONTROLLER | No ASD Relay Voltage Sensed At SBEC Controller | ||||||||
| 44 | BATTERY TEMP SENSOR VOLTAGE OUT OF LIMITS | Battery Temp. Sensor Voltage Out Of Limit | ||||||||
| 46(2)(3) | CHARGING SYSTEM VOLTAGE TOO HIGH | Charging System Voltage Too High | ||||||||
| 47(2)(3) | CHARGING SYSTEM VOLTAGE TOO LOW | Charging System Voltage Too Low | ||||||||
| 51(3) | O2 SIGNAL STAYS BELOW CENTER (LEAN) | O2 Sensor Signal Stays Lean | ||||||||
| 52(3) | O2 SIGNAL STAYS ABOVE CENTER (RICH) | O2 Sensor Signal Stays Rich | ||||||||
| 53 | INTERNAL CONTROLLER FAILURE | Internal Engine Controller Fault Condition Detected | ||||||||
| 53 | CONTROLLER FAILURE SPI COMMUNICATIONS | No Internal Communication Between Co-Processors | ||||||||
| 54 | NO SYNC PICK-UP SIGNAL | No Synchronization Pick-Up Signal | ||||||||
| 55 | NO DISPLAY (BLANK) | Completion Of Fault Code Display By CHECK ENGINE Light | ||||||||
| 62 | CONTROLLER FAILURE (EMR MILES NOT STORED) | Engine Controller Failure, EMR Miles Not Stored | ||||||||
| 63 | CONTROLLER FAILURE EEPROM WRITE DENIED | Engine Controller Failure, EEPROM Write Denied | ||||||||
| 76(4) | FUEL PUMP RESISTOR BYPASS RELAY CIRCUIT | Open/Short Detected In The Ballast Resistor By-Pass Circuit | ||||||||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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