Diagnostics

[Swayze]

is this perchance something that Ludis debugger board would take advantage
of?

Swayze
mswayze at truswood.com
kswayze at bellsouth.net
<8-{b>
----- Original Message -----
From: "Peter Gargano" <peter at techedge.com.au>
To: <gmecm at diy-efi.org>
Sent: Friday, September 15, 2000 4:34 PM
Subject: Re: Diagnostics


> Swayze wrote:
> >
> > a post not too long ago in regards to axxc.s bin on incoming, discussion
by
> > John Gwynne in regards to NVRAM on '730 and ALDL Mode11. wish I had more
> > details, but should be in the archives.
>
> Yep, seen that! That is (becoming) a standard way to change
> tables that exist in NVRAM, and is used by John, Kalmaker,
> myself, etc. The ALDL command(s) modify data table, or if you
> like, they modify the calibration data, not the code.
>
> What I was really after was information on factory diagnostics
> that are downloaded into the ECU - into the small RAM area
> between 0 .. 1FF, and are then executed there. These are not
> tables, but are 68xx instructions that are loaded from a PC's
> (or other diagnostic tool) disk (or cartridge) etc. Note that
> I'm only inferring the existence of these diagnostic bits of
> code from the fact that I've disassembled ALDL commands that
> set up RAM with ALDL data (well, code actually) and jump there
> to execute it.
>
> I wouldn't be surprised if no-one has seen these diagnostics,
> but GM put that code in (some) ECUs for a reason...
>
> Peter
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