[Gmecm] Acquiring ECM schematic

Thu Jun 8 20:39:51 UTC 2006

Seems like there'd be a market for new ECM's that connect to all the
factory wiring, but use modern electronics.  Plus maybe do things a little
better (bigger BLM map, etc.) and with better instrumentation.

I don't think there's anything like this though, is there?  I mean,
besides DIY plans.

> 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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