A 7-bit counter tracking how many times the specific fault has transitioned from inactive to active.
Used during vehicle operation to report immediate issues and allow ECUs to self-compensate based on received diagnostic info. Repair & Service: Sae J1939-73 Pdf
The most frequently implemented messages from the J1939-73 specification are the Diagnostic Messages 1 (DM1) and 2 (DM2). DM1 (Active Faults) A 7-bit counter tracking how many times the