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Home › Eagle › 1989 › Premier ES › Repair and Diagnosis › Engine Performance › System › 3.0L Systems/Tests W/Codes › Testing & Diagnosis › Ecu Checkout Procedure

Ecu Checkout Procedure

  1. If during testing the ECU is found to be faulty, perform the following steps to ensure ECU is faulty. Most components are incorrectly diagnosed due to faulty electrical connectors or a poor mechanical connection between component and vehicle.
  2. Sometimes simply disconnecting and connecting an electrical component will provide a good electrical connection. Before replacing an ECU, check all components in the suspect circuit. If other components are okay, carefully disconnect ECU from vehicle harness.
  3. Inspect ECU harness connector and ECU contact pins for corrosion. Clean harness connector and ECU contact pins with contact cleaner.
  4. Inspect ECU harness connector for bent pins, missing pins and broken wires. Repair or replace as necessary.
  5. Connect ECU harness connector to ECU and retest system with DRB-II and adapter. If vehicle does not pass test and fails with the same message, replace ECU.
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