Diagnosis of CAN Data Bus - VVT communication

U1172, U1174 

The diagnosis of the local CAN communication between VVT control module and PCM is done by supervision of the received VVT local CAN messages.

If a VVT local CAN message is missing for a calibrated period of time, a timeout is detected and a signal fault CVVT is set.

If the checksum or the sequence number of a VVT local CAN message is wrong for a calibrated period of time, a malfunction is detected and a plausibility fault CVVT is set.