Diagnostic Information - OBD-II

Peter Shoebridge peter at aspenres.com
Mon Dec 30 18:01:03 GMT 1996


Felix,

I believe all new cars sold in the US have to comply with OBD-II. I don't 
have the pin-outs but there is an SAE doc (HS-3000/96) which specifies all 
the OBD-II stuff. It is available direct from SAE (check www.sae.org), it's 
$79. OBD-II is based on SAE J1850 serial bus protocol. As far as I can tell 
although all manufacturers implement the same basic messages, there is 
plently of room for each to use custom messages making a universal scan 
tool a pipe dream.....

Regards

Peter

----------
From: 	Felix Homburg
Sent: 	Saturday, December 28, 1996 11:04 AM
To: 	DIY_EFI at coulomb.eng.ohio-state.edu
Subject: 	Diagnostic Information - OBD-II

I would like to know a little bit more about OBD-II. I'm from Europe and 
for the
cars in Europe it's not law to have OBD-II. Do all the new cars in the U.S. 
have
a compatible connector for OBD-II. Does anyone have the pinout and the 
outlines
of this connector?
Are the scan-tools for OBD-II for all cars the same or does a garage use
different scan-tools for different cars?
I'm working on diagnostic system for VW/Audi and I'd like to include the 
OBD-II
protocol so it would be interesting for me to get a little bit more 
knowledge
about that.

Thanks

Felix


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