Automatic Transmission

U0101, U1200, U1202 

The diagnosis of the powertrain CAN communication between the TCM and the PCM is done by supervision of the received TCM powertrain CAN messages.

If a TCM powertrain CAN message is missing for a calibrated period of time, a timeout is detected and a signal fault CEGS is set.

If the checksum of a TCM powertrain CAN message is wrong for a calibrated period of time, a malfunction is detected and a plausibility fault CEGS is set.

If the sequence number of a TCM powertrain CAN message is wrong for a calibrated period of time, a malfunction is detected and a minimum fault CEGS is set.