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 MANUALSJEEP1993GRAND CHEROKEE BASE, 5.2 Y, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 5.2LCOMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULE (PCM)HARNESS CHECK
1993 Jeep Grand Cherokee Base, 5.2 Y, AWD
Harness Check
1993 Jeep Grand Cherokee Base, 5.2 Y, AWDSECTION Harness Check
- If Powertrain Control Module (PCM) is found to be faulty during self-diagnostics testing, perform following steps to confirm diagnosis. Most components are incorrectly diagnosed due to faulty electrical connectors or poor connections between component and vehicle. Sometimes, simply disconnecting and connecting an electrical component will provide a good electrical connection.
- Before replacing PCM, check all components in suspected circuit. If components are okay, carefully disconnect PCM from vehicle harness.
- Inspect PCM harness connector and PCM contact pins for corrosion, bent pins, missing pins, spread terminals and broken wires. Clean, repair or replace connector as necessary.
- Connect PCM harness connector to PCM, and retest system using Diagnostic Readout Box II (DRB-II) or similar scan tool. See G - 5.2L TESTS W/ CODES article in the ENGINE PERFORMANCE Section. If vehicle does not pass test and fails with same message, replace PCM.
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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.