GM PCM OBD-II HW registers

[David Cooley]

GM has been Motorola Based for the most part.  I would suspect, that they 
have used a one off proprietary piece, since Motorola doesn't list any data 
on their site for HC11 based J1850 controllers.  They list HC16, HC32 and 
HC05 based units, and I have heard they have a stand-alone chip that does 
J1850 to SPI (though not listed on their site or available to the public...)


At 08:47 AM 12/23/1999 -0500, you wrote:
>Hi,
>     Does anyone out there know about the OBD-II hardware interface
>chips?  I'm interested in any register descriptions.  Does anyone know
>what chip is used in the GM PCM's?  (I'm looking at a '96 right now).
>I've got some data sheets on some Intel OBD-II chips, but I'd be
>surprised if GM uses those.
>
>Any  help would be greatly appreciated,
>Dave Hempstead
>dave_hempstead at agilent.com

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