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Equipment-and-Tool-Institute / j1939-84

J1939-84 implementation for etools.org
MIT License
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DM33 ECU responds with control byte = 3 #1194

Closed anthonyhbest closed 1 year ago

anthonyhbest commented 1 year ago

Propose to remove 6.7.16.4.c and 6.8.13.2.c "c. Warn if any OBD ECU NACKs with control byte = 3"

Control byte = 3 is a valid response from an ECU when the ECU is already in a transport protocol session.
This will always happen when there is a transport protocol session initialized when EC1 is broadcasted. EC1 is broadcast every 5s and on change.

ericthomasswenson commented 1 year ago

See #1201 … this warning is to be corrected. Busy responses suggest an ECM would clear DTCs.

ericthomasswenson commented 1 year ago

DM3 is a clear faults command … the response does use TP.