Engine Control Module: Service Precautions

Observe the precautions to ensure safe and proper servicing.




- Before connecting or disconnecting any harness connector for the multiport fuel injection system or ECM:

Turn ignition switch to OFF position.
Disconnect negative battery terminal.
Otherwise, there may be damage to ECM.

- Before disconnecting pressurized fuel line from fuel pump to injectors, be sure to release fuel pressure.
- Be careful not to jar components such as ECM and mass air flow sensor.