Sae J1939-73 Pdf ~repack~ -

Periodically broadcasts fault codes that are currently active. DM2 (Previously Active Faults):

Checks if monitors are complete (important for emissions compliance). Sae J1939-73 Pdf

J1939-73 defines the "Diagnostic Messages" (DMs) that act as the vehicle's internal reporting system: Sae J1939-73 Pdf