LT1 obd2 disassembly

[Jason Haines]

That disassembly seems to be from a 1997 LT1 so it has to be an F-body
(Camaro or Firebird - they used the same files in 1997). I think the correct
PCM part number for the 1997 LT1 F-body is 16242921. You can tell that the
file is from a 1997 because the ID byte is 73 (it would be a 55 or 54 if it
was a 1996). The other half of the calibration should have an ID byte value
of 74.

Jason


----- Original Message -----
From: "Programmer" <nwester at eidnet.org>
To: <gmecm at diy-efi.org>
Sent: Thursday, August 30, 2001 3:27 PM
Subject: Re: LT1 obd2 disassembly


> Woah--you got my attention.
> What's the app----what years ?
>
> Lyndon
> ----- Original Message -----
> From: Daa Wagon <daawagon at yahoo.com>
> To: <gmecm at diy-efi.org>
> Sent: August 29, 2001 7:51 PM
> Subject: LT1 obd2 disassembly
>
>
> >
> > Years ago in the archives, there was a guy named T.H. working on
> disassembling his obd2 LT1 PCM.  He has gone on to play with other toys,
but
> he has been kind enough to make it available.  It's pretty impressive, if
> that was me, I'd have gone thru a whole case of foil lined CSH's by the
time
> (if ever) I got that far ....
> >
> > Note that there are sections from $2000 up to $ffff and a second $8000
to
> $ffff which has to do with the bank switching to use a 128k eeprom.  It's
> not obvious to me with just a quick look how it works, but I suppose I
> should reread Motorola's how to on that:  AN432 - 128k byte addressing w/
> HC11.  I believe that this is the 't' side disassembly.
> >
> > Some of this may be common to the obd1 LT1, I learned a few things I
> didn't know already, just looking at it for a little while.
> >
> > It's on incoming.
> >
> > ftp://ftp.diy-efi.org/incoming/LT1_obd2_tside_dis.zip
> >
> >
> >
> >
> >
> > ---------------------------------
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