Sae J1939-73 Pdf ✓
Diagnostic messages include an 8-bit Source Address (SA) representing the unique identity of the ECU reporting the fault.
Allows a diagnostic tool to request which SPNs an ECU supports (handy for third-party testing). Sae J1939-73 Pdf
It works alongside SAE J1939-71 , which specifies general parameter placement in data groups. Diagnostic messages include an 8-bit Source Address (SA)