[Gmecm] GMLAN and Class 2

[Steve Ravet]

Bill, take a look at the OBD2 info on the gmecm page:

http://www.diy-efi.org/gmecm/ecm_info/obd2/

The definitive references are the SAE documents.  I used to have them
online but had to remove them when I got a certified letter from SAE.  I
found them originally via google so you might be able to find them also.
Or try a library.  J1850 is the electrical specification and you can
find out all you need to know about it from the whitepapers and app
notes on that page.  The other 2 documents have higher level
information.

For you or anyone else who is interested I am working on a board that
will connect a GM OBD2 system to a computer via USB.  It has 2 chips and
a BOM of about $30.  I've created the initial PCB which had some
problems so I'm still debugging.  I'm hoping that if I provide the
hardware and some basic software that others will run with it to create
scan tools, editors, reflashers, etc.

What are you contemplating?

--steve

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org 
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Bill Shaw
> Sent: Friday, September 29, 2006 1:23 PM
> To: gmecm at diy-efi.org
> Subject: [Gmecm] GMLAN and Class 2
> 
> Anyone have any info on the GMLAN and Class 2 data busses in 
> the C5 and
> C6 Corvette? I'm specifically looking for communications 
> protocols, data packet descriptions, command descriptions, 
> interface chips, software or hardware tools for talking on 
> the busses or monitoring data flow, that kind of stuff.
> 
> Any info or pointers would be appreciated.
> 
> Bill
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