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.
2001 Jeep Cherokee Limited, RWDFACTORY OEM SERVICE PROCEDURE
Checking Powertrain Control Module (PCM) Power & Ground Circuits (Grand Cherokee)
- Turn ignition off. Disconnect PCM Black C1 connector. PCM is located on firewall in right rear corner of engine compartment. Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. Using a test light connected to ground, probe terminal No. 22 (Red/Black wire) at PCM C1 harness connector. See Figure . If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open fused B(+) circuit (Red/Black wire) between fuse No. 19 (10-amp) in Power Distribution Center (PDC) and PCM. PDC is located in right side of engine compartment, next to battery. Also check fuse No. 19 in PDC. See WIRING DIAGRAMS article.
- Turn ignition on. Using a test light connected to ground, probe terminal No. 2 (Orange/Dark Blue wire) at PCM C1 connector. See Figure . If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open fused ignition switch output circuit (Orange/Dark Blue wire) between fuse No. 12 (10-amp) in junction block and PCM. Junction block is located under left side of instrument panel. Also check fuse No. 12 in junction block.
- Turn ignition off. Using a test light connected to positive battery voltage, probe terminals No. 31 (Black/White wire) and No. 32 (Black/Tan wire) at PCM C1 connector. If test light illuminates brightly at both terminals, ground circuits are okay. Test is complete. If test light does not illuminate brightly at one or both terminals, repair open in Black/White and/or Black/Tan wire between PCM and ground. Ground connection is located on right side of cylinder block.
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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