General Precautions and Preparation

1. Before connecting or disconnecting the Engine Control Module (ECM) harness connector, turn ignition switch OFF and disconnect negative battery terminal. Failure to do so may damage the ECM. Because battery voltage Is applied to ECM even if the ignition switch is turned off.




2. When connecting ECM harness connector, tighten securing bolt until red projection is in line with connector face.




3. When connecting or disconnecting pin connectors into or from ECM, take care not to damage pin terminals (bend or break).
4. Make sure that there are not any bends or breaks on ECM pin terminal, when connecting pin connectors.




5. Before replacing ECM, perform ECM input/output signal inspection and make sure whether ECM functions properly or not.




6. After performing each TROUBLE DIAGNOSIS, perform "0VERALL FUNCTION CHECK" or "Diagnostic Trouble Code (DTC) DETECTING CONDITION".

The DTC should not be displayed in the "DTC DETECTING CONDITION" if the repair is completed. The "0VERALL FUNCTION CHECK" should be a good result if the repair is completed.




7. When measuring ECM signals with a circuit tester, never bring the two tester probes into contact.

Accidental contact of probes will cause a short circuit and damage the ECM power transistor.