[Gmecm] Acquiring ECM schematic

[davesnothereman at netscape.net]

AFAIK The 8331 guys have to stick together.  When Chevrolet announced 
no more parts for the ZR1 everything suddenly disappeared.  I suppose 
the guys who can afford that car can also afford the parts?  It must be 
really tough if you're not a resident of the US.

I have to think the wise answer is to move on to the next generation of 
engine control hardware, at least for us.  The later pcm's have more of 
everything... but we really aren't using them.  Why?  Same old story.  
Not enough info about the code, not enough tools to work with them.

It's really, really too bad that GM / Delco / Delphi never saw fit to 
release a reasonably priced aftermarket ecm.  Even an "offroad only" 
limited function code for a specific OBDII pcm would have been nice.

Zaphod

-----Original Message-----
From: Ryan Hess <rgmecm at yahoo.com>
To: gmecm at diy-efi.org
Sent: Thu, 8 Jun 2006 13:25:19 -0700 (PDT)
Subject: RE: [Gmecm] Acquiring ECM schematic

   Wow, I did not know that.  I can't imagine going through a 4 layer 
board, and
worse, trying to figure out what IC does what.

Who would you suggest I request information from?  Delphi?  Who built 
their
early 90's OBDI ECM's?

As sort of an aside, GM stopped making/supporting the 1228331 ECM found 
on ZR1
vettes and the turbo lotus.  There was another part # that superceeded 
it, but I
believe it too had been discontinued.  What are those people to do?  
They don't
exist in junkyards (I've looked), and there's *one* on ebay for nearly 
$600.  If
GM doesn't release the schematic for it, wouldn't they be out of luck?

This secretive environment is just terrible.  These things are 
approaching 15-20
years old now.



davesnothereman at netscape.net wrote: Ryan Hess  wrote:

>
>Question: how have ECM schematics been acquired in the past? ???the
>7730/49 on ludis' site, etc?
Old fashioned reverse engineering.

>I'm in contact with an ECM remanufacturer, who
>presumably has a great deal of knowledge locked away somewhere. ???The
>question is, how do I coerce it out of them? ???

Maybe you should request information as an ecm remanufacturer?  There 
are a few
rebuilders, they must have obtained information in some way.
I'm specifically looking
>for a schematic of a '2240.
>
>
>I have to assume this is like the TV repair business, where the mfr
>charges a fee for access to their schematics..

They may not release schematics at all.  GM is a provider of rebuilt 
ecm's.
They have no need to support the business of repairing and rebuilding 
computers.

I know that it's easier to pull a hen's teeth than obtain Delco service
information for audio products, even those which are 15 years old.  And 
once you
get service info, finding parts is even tougher.

Zaphod



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