Motor Shut Down (MSDN)

The PCM keeps the traction motor inverter enabled by continuously toggling the generator motor shut down (GMSDN) output. Typical output frequency varies between 49 and 75 Hz at 50% duty cycle. The PCM also broadcasts a redundant not shutdown message to the TCM over the communication link. When a concern condition is detected, the PCM stops generating this frequency signal and broadcasts a shutdown message to the TCM over the CAN communication link. The TCM then disables the traction motor inverter and sets an appropriate DTC. In the event of GMSDN circuit failure, the PCM still broadcasts a not shutdown message but the hard wire signal frequency is out of expected range. If the circuit becomes open, the vehicle shutdowns and the TCM sets the appropriate DTC.