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SAE J1939-73 Diagnostic Layer

J1939/73 specifies the diagnostic layer for a J1939 network and is the only application layer published and supported for J1939. This specification is responsible for defining all diagnostic layer SPNs and PGNs. J1939-73 defines messages for active faults, passive faults, and clearing faults. Also messages for OBD-2 compliance and flash bootloader operation (i.e. erase and programing of flash).

PGN 65226 Active Diagnostic Codes

Transmission Repetition: See J1939-73 spec
Data Length: Variable
Default Priority: 6
Parameter Group Number: 65226

 

Start Position Length Parameter Name SPN
1.8-1.7 2 bits Malfunction Indicator Lamp Status 1213
1.6-1.5 2 bits Red Stop Lamp Status 623
1.4-1.3 2 bits Amber Warning Lamp Status 624
1.2-1.1 2 bits Protect Lamp Status 987
3-6 4 bytes DTC n/a

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