J1939 Decoding Query: PGN/SPN Description Source for DM Messages

Knowledge Base
#1

I’m currently implementing the decoding logic for J1939 Diagnostic Messages (DMs). I have successfully used the procedures in J1939-73 to extract the raw SPN and FMI numbers from the DM payloads.

My immediate requirement is to get the full text descriptions and conversion formulas for these extracted numbers.

I need confirmation on which document I should refer for this:

  1. SAE J1939-71
  2. SAE J1939 Digital Annex (J1939DA)

Could you please suggest if I need to refer the J1939DA for the data tables, or if the descriptions are sufficiently present and usable within the J1939-71 document?

Thanks,