J1939/73

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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