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 - 3.3L (CNG)COMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULE (PCM)DIAGNOSTIC CHECK
1994 Plymouth Grand Voyager Base, 31TH
Diagnostic Check
1994 Plymouth Grand Voyager Base, 31THSECTION Diagnostic Check
PCM is tested using DRB. See appropriate testing in TESTS W/CODES - 3.3L CNG article in the ENGINE PERFORMANCE section.
RENDER: 1.0x
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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.