I'm hoping that someone here might be able to help. I have a 97 GMC
Jimmy (S series) and I've got to get looked at because of the service
engine soon light.
What I'm wondering, is there some place on the Internet (or elsewhere),
where one can obtain the data structures and protocols used by GMC?
Better yet would be something that could simply be installed and used,
but being a programmer I figured that if I could at least get my hands
on the specs for this stuff I'd probably be able to write the program
Can one find these things anywhere?
I would wager that is an ODB-II system. Most auto parts stores will
pull the codes for you for no charge. Or pick up a code reader for
yourself. Or search the net with your favorite search engine and you'll
likely get lots of hits on the subject.
Check out www.bb-elec.com they make many protocol converters and also have a
OBD II Diagnostic scanner for vehicles '96 and up. They also provide some
info on the protocols used by GM, Ford, Chrysler. They don't get into
detail but they list the Standards (i.e. GM uses SAE J1850 VPW.) I believe
the Society of Automotive Engineers writes the standard protocols, at least
in the US.
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