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.
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HOMESERVICE MANUALSJEEP1991CHEROKEE 2WD L4-150 2.5L VIN P MFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSSERVICE AND REPAIRSERVICE REMINDER INDICATOR RESET PROCEDURESCHECK ENGINE LAMP
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Check Engine Lamp
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Check Engine Lamp
The Check Engine lamp will be illuminated for approximately three seconds after the ignition switch has been placed in the On position as a bulb check. If incorrect or no signals are received by the Single Module Engine Controller (SMEC) from various sensors, the engine controller will illuminate the Check Engine lamp. After diagnosing and servicing the fuel injection system or emission related systems, the memory will be cleared after approximately 20-100 ignition key on-off cycles or by using the Diagnosis Readout Box II (DRB II) and selecting the fault code erasure mode.
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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.