OBD-II ECU/PCM commented assembly language listings

[Gary A. Allen, Jr.]

Mike,

Thanks for the suggestion.  I downloaded a listing  of assembly code
(asty_hac.dsm) that someone had disassembled from a pre-OBD-II ECU.
Unfortunately I think it will be of limited use in unravelling my Saturn's
PCM.  Around February 1999, Tom  Hussey said that he created a commented
assembly language listing for an OBD-II PCM.  Did his listing (or any other
OBD-II PCM listing)ever get stored on the DIY-EFI public archive?  Thanks!

                                                                 Gary
Swayze wrote:

> Gary,
> welcome to the list.
> have you perchance taken a look at the .ecu files for some of he known
> 'tuning' parameters in the earlier 1227727..730..747....   ecm's. the format
> list a lot of the code locations for some of the 'variables'. also of
> interest might be the p4.doc--not sure if any of the locations of
> 'factoring' constants would be viable though. The aldl stuff for the earlier
> ecm's is there.
>
> the J- documents may have more of the info that you are looking for as to
> OBDII specs.
>
> 'in digest mode'
> Mike
> Swayze
>
> <Date: Sat, 27 Jan 2001 22:17:52 -0800
> <From: "Gary A. Allen, Jr." <gallen8 at attglobal.net>
> <Subject: Lots of questions about Saturn PCMs
>
> <This is my first post to this discussion group.  Since I'm a newbie,
> <I'll
> <do a a self introduction and then ask my newbie questions.  I became
> <aware of this discussion group from a digest of postings from DIY-EFI
> <that started on 7 Feb 1999 and ended on 1 Jan 2000.  I am unaware of
> <,what
> <has been posted here since 1 Jan 2000 (apologies in advance if my
> <questions
> <were recently answered or now considered off-topic).
>
> <My area of interest is OBD-II PCMs for the Saturn.  I own a 1996 Saturn
> <SL-I with a 5 speed transmission and a benchtop PCM that I pulled from a
>
> <junked 1999 Saturn station wagon that had an automatic transmission.
> <I communicate to the PCMs through my PC's RS-232 serial port using a
> <Multiplex Engineering J1850-VPW adapter that came with the GMTOOL
> <software purchased from CarComp Inc.  I also own a complete set of
> .................................>
>
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