15.5.1 Functional check

(U0101)

General description: 

The CAN driver chip monitors the CAN-messages from the transmission control unit. Faults are detected for the following cases:

• Timeout of the CAN-Signal
• Checksum
• Alive Counter
• Signal fault

If an error is detected, a preliminary fault code is stored. If an error is detected in two consecutive driving cycles, the MIL is illuminated.

Flowchart: 

Fig 1: DTC Storage Flowchart (CAN Communication Transmission Control Module)

Courtesy of BMW OF NORTH AMERICA, INC.