ECM General Information

NOTE: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.

Service of the Engine Control Module (ECM) normally consists of either replacement or reprogramming. If the diagnosis indicates a replacement is needed, make sure that the replacement ECM is the correct part. If the new ECM is correct, remove the malfunctioning ECM and install the new service ECM. Reprogram the new ECM with the frequency code of the theft deterrent module currently on the vehicle. Before programming the new ECM, ensure that the following conditions exist:
^ The battery is fully charged.
^ The ignition switch is in the RUN position.
^ The connection at the Data Link Connector (DLC) is secure.

Follow the instructions on the Tech Line terminal and the scan tool when programming the ECM. If the ECM fails to accept the program, check the following conditions:
^ Inspect all of the ECM connections.
^ Verify that the scan tool has the latest version of the software.