[Gmecm] Acquiring ECM schematic

[Ryan Hess]

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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