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Harness Check

  1. If during SELF-DIAGNOSTICS testing, engine Electronic Control Module (ECM) is found to be faulty, perform the following steps to confirm diagnosis.
  2. Most components are incorrectly diagnosed due to faulty electrical connectors or poor connections between component and vehicle.
  3. 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.
  4. Inspect ECM harness connector and ECM contact pins for corrosion. Clean harness connector and ECM contact pins with contact cleaner.
  5. Inspect ECM harness connector for bent pins, missing pins and broken wires. Repair or replace as necessary.
  6. 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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