Bit-serial data interface (BSD): Diagnosis

The DME/DDE monitors the communication across the bit-serial data interface to the connected components. This means that line faults are also detected.

The connected components have their own diagnosis functionality and monitor the following:

• The executed functions are monitored for faults (e.g. faulty preheating circuit for the preheating control unit)
• Internal faults in the components

If a component detects a fault, it reports the fault across the bit-serial data interface to the DME/DDE. The DME/DDE then enters the fault in the fault memory.