[Gmecm] GMLAN and Class 2

[Steve Ravet]

Not likely.  OBD2 was supposed to unify the electrical interface and
protocols, but failed on the electrical portion.  There are 3 different
OBD2 electrical interfaces, and my circuit uses the Freescale XC68hc58
chip which only does the GM flavor.  Research your computer and if you
see J1850 or VPW then it may work, otherwise probably not.

--steve 

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org 
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Don Sauman
> Sent: Saturday, September 30, 2006 6:47 PM
> To: gmecm at diy-efi.org
> Subject: Re: [Gmecm] GMLAN and Class 2
> 
> Hi Steve
> 
> Is there any possibility that your circuit will allow scan 
> analysis on a
> 1999 Jeep Cherokee with VM 2.5lt diesel (appears to be OBD II)
> 
> Don
> 
> Steve Ravet wrote:
> 
> >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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> >>    
> >>
> >
> >
> >--
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> Don Sauman
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The 2006 ARM Developers' Conference, October 3-5, Santa Clara, US 
Join ARM and its technology and tools Partners from around the world at the only industry event for developers of ARM Powered(R) solutions. 
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IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium.  Thank you.