What are some failure modes and causes and effects of these failures for communication of fault information on J1939 network?

[jani12]

Please consider Electro Hydraulic Power Steering (EHPS) System installed in a commercial truck. It has dual motors and dual pumps and dual pump Electronic Control Units (ECUs). These pump ECUs communicate with other ECU over public J1939 network.



Embedded steering software executes in pump ECUs. One function of this software is to communicate diagnostic fault codes to service tool and Instrument cluster. And communicate power consumption to energy management system.

What are some failure modes, causes of failures, and effects of failure for this function? Are following the failure modes:

1. Does not communicate diagnostic fault codes to service tool and instrument cluster. And does not communicate power consumption to energy management system. Is following cause of this failure?
   1. Incorrect J1939 source id or incorrect CAN identifier or other parts of message incorrect or incorrect checksum? What are some effects of this failure?
2. Erratically communicates diagnostic fault codes to service tool and instrument cluster. And erratically communicates power consumption to energy management system. What are some causes and effects of this failure?
3. What are some other failure modes for this function. And what are some causes and effects of those failures?