Engine Control Module Replacement: Notes

NOTE:

In order to prevent internal ECM damage, the ignition must be OFF when you disconnect or reconnect the power to the ECM. For example, disconnect the power when you work with the following components:

A battery cable
The ECM pigtail
The ECM fuse
Jumper cables

NOTE:

When you diagnose or replace the ECM, remove any debris from the ECM connector surfaces before servicing the ECM module connector gaskets. Make sure that the gaskets are installed correctly. The gaskets prevent contamination intrusion into the ECM.

NOTE:

The replacement ECM MUST be programmed.

Engine control module (ECM) service should normally consist of either ECM replacement or electrically erasable programmable read only memory (EEPROM) programming. If the diagnostic procedures require ECM replacement, inspect the ECM first to see if the correct part is being used.