1.15.18.2 Semi-automatic transmission

U0101 (CSSGsig), U1202 (CSSGnpl) 

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 CSSGsig fault will be set.

If the checksum or the sequence number of a TCM powertrain CAN message is wrong for a calibrated period of time, a malfunction is detected and a CSSGnpl fault will be set.

If the content of a TCM powertrain CAN message during the following gear shift phases

• no gear shift active
• gear shift active with engine stop request
• gear shift active without shifting
• gear shift active with torque reduction phase
• gear shift active with engine speed control phase
• gear shift active with torque increase phase

is not rational, a malfunction is detected and a CSSGnpl fault will be set.