Theory Of Operation

The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation.

After installation of a new TCM, the Scan Tool MUST be used to perform the TCM Initialize EGS routine to learn the TCM variant and configure the controller for the proper Vehicle, Engine, and Driveline application. During the TCM Initialize EGS routine, several modules on the CAN-C bus are requested to send data to the TCM. These modules are the Powertrain Control Module (PCM), Body Controller (TIPM/BCM), and Anti-Lock Brake System (ABS) Module.