Engine Control Module: Service Precautions

- Before connecting or disconnecting the 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 ignition switch is turned off.




- When connecting ECM harness connector, tighten securing bolt until the gap between orange indicators disappears.

Torque: 3 - 5 N.m (0.3 - 0.5 kg-m, 26 - 43 in-lb)




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




- Before replacing ECM, perform "ECM Terminals and Reference Value" inspection and make sure ECM functions properly.




- After performing each TROUBLE DIAGNOSIS, perform "DTC Confirmation Procedure" or "Overall Function Check".
The DTC should not be displayed in the "DTC Confirmation Procedure" if the repair is completed. The "Overall Function Check" should be a good result if the repair is completed.




- When measuring ECM signals with a circuit tester, never allow the two tester probes to contact. Accidental contact of probes will cause a short circuit and damage the ECM power transistor.




- Regarding model V41, cylinder number and bank layout are as shown in the figure.