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 MANUALSPLYMOUTH1994SUNDANCE BASE, 2D HATCHBACK, 2.2 D, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 22 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS)COMPUTERIZED ENGINE CONTROLSCONTROL MODULEHARNESS CHECK
1994 Plymouth Sundance Base, 2D Hatchback, 2.2 D, Automatic
Harness Check
1994 Plymouth Sundance Base, 2D Hatchback, 2.2 D, AutomaticSECTION Harness Check
WARNING: This page is about a different car, the 1994 Plymouth Laser and 1994 Eagle Talon. However, it is still accessible from the selected car via links, so may be relevant.
- If during SELF-DIAGNOSTICS testing, engine Electronic Control Module (ECM) is found to be faulty, perform the 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 ECM, check all components in suspected circuit. If components are okay, carefully disconnect ECM from vehicle harness.
- Inspect ECM harness connector and ECM contact pins for corrosion. Clean harness connector and ECM contact pins with contact cleaner.
- Inspect ECM harness connector for bent pins, missing pins and broken wires. Repair or replace as necessary.
- Connect ECM harness connector to ECM and retest system with Diagnostic Readout Box (DRB) or similar scan tester. See appropriate TESTS W/CODES - 1.8L article and TESTS W/CODES - 2.0L/2.0L TURBO in the ENGINE PERFORMANCE section. If vehicle does not pass test and fails with the same message, replace ECM.
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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.