Theory Of Operation

The purpose of the diagnostic is to check if the service Transmission Control Module (TCM) has been programmed by the dealer service technician with production software. The service TCM is received at the dealer service location with the program state bit set as "not programmed" in the TCM's non-volatile memory. This bit will switch to the "programmed" state when the production transmission software is programmed into the TCM. If this service procedure is not performed, a fault code will be set when the TCM is powered