ABS J1939

[Bengy88]

With a j1939 fault my first step without proper diag software would be to check fuses and power/ ground supplies to the abs module. Peterbuilts and kenworths are horrible about corrosion in the fuse pannel causing a voltage drop at the fuse. Remember with no power or ground a module can't communicate on the data link which will cause j1939 faults.... Alot of people overlook this and go directly to a non existant j1939 problem