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 MANUALSPLYMOUTH1994GRAND VOYAGER BASE, 31THREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 3.8LCOMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULE (PCM)HARNESS CHECK
1994 Plymouth Grand Voyager Base, 31TH
Harness Check
1994 Plymouth Grand Voyager Base, 31THSECTION Harness Check
- If 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 a component connector will provide a good electrical connection.
- Inspect PCM 60-pin harness connector, harness and PCM contact pins for corrosion, bent pins, missing pins, spread terminals and broken wires. Clean, repair or replace as necessary. Check all components, harness and connectors in suspected circuit.
- Connect PCM 60-pin harness connector to PCM, and retest system using Diagnostic Readout Box (DRB) or similar scan tool. See TESTS W/CODES - 3.8L 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.