[Gmecm] ECM compatibility 1228706 1227730...

Thu Nov 8 23:46:34 UTC 2012

can you upload the pictures you took elsewhere? i'm not sure what is going on, but i get server permission issues when trying to view/download them.

--- On Thu, 11/8/12, David Allen <davida1 at hiwaay.net> wrote:

From: David Allen <davida1 at hiwaay.net>
Subject: Re: [Gmecm] ECM compatibility 1228706 1227730...
To: gmecm at diy-efi.org
Date: Thursday, November 8, 2012, 6:41 PM

Well - the verdict is in! The 8706 appears to support the same program that the 7730 will run.
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Car: 1988 Cutlass Ciera XC / 2.8 MPFI Turbo engine /?125C transmission
Chip:?BFAU?$A1
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Removed 1227730 ECM.
Installed 1228706 ECM with car's original chip.
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There was no?detectable change in any of the following?areas:
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Engine performance
Accessory function?(A/C?coolong fans etc)?
Datalink (ALDL) function
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So there you have it. Assuming the chip program is functional (not in limp-mode) these 2 ECM's appear to be interchangable. 
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Sincerely,
David

----- Original Message ----- 
From: David Allen 
To: gmecm at diy-efi.org ; Robert Saar 
Sent: Thursday, November 08, 2012 4:43 PM
Subject: Re: [Gmecm] ECM compatibility...

Robert, here are some pictures of the ECMs in question. They look very much identical. I'll be intertested to try running $A1 and $59 on this. If it works, it will help me out because there are a lot of 3300 cars currently at the junkyard.
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Sorry for the large filesize, but I wanted PNG compression so the details of the PCB would not be blurred by the lossy JPEG compression.
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I keep having things "come up" and haven't tried plugging it in yet!
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I have a feeling there COULD be a difference in the limp-mode functionality. The 3300 engine was a MAF and the others speed-density. Maybe if one didn't care about limp-mode functioning it would not matter.
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Thanks,
David
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http://68.209.87.173/temp/7730_1.png
http://68.209.87.173/temp/7730_2.png
http://68.209.87.173/temp/7730_3.png
http://68.209.87.173/temp/8706_1.png

http://68.209.87.173/temp/8706_2.png

http://68.209.87.173/temp/8706_3.png
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----- Original Message ----- 
From: Robert Saar 
To: gmecm at diy-efi.org 
Sent: Wednesday, November 07, 2012 3:53 PM
Subject: Re: [Gmecm] ECM compatibility...

the 7730 already has all of the outputs necessary to run the 4T60E, and i'll agree with Jay, i don't remember seeing a 60E with the 3300 cars.
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might want to pop it open and take some pics to see what is different from a 7730?

--- On Wed, 11/7/12, David Allen <davida1 at hiwaay.net> wrote:

From: David Allen <davida1 at hiwaay.net>
Subject: Re: [Gmecm] ECM compatibility...
To: gmecm at diy-efi.org
Date: Wednesday, November 7, 2012, 8:50 AM

Thanks for the info.? I bet it has outputs for the e-series transmission shift controls. I beleive by 1993 the 3.3 cars had a 4T60E trans.? Today?if I have time, I'm going to see if it will run the MAP $A1 code in my 2.8 powered car.
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Sincerely,
David.
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----- Original Message ----- 
From: Robert Saar 
To: gmecm at diy-efi.org 
Sent: Tuesday, November 06, 2012 4:57 PM
Subject: Re: [Gmecm] ECM compatibility...

http://www.exatorq.com/ludis_obd1/p4xref.html
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looks like it is indeed a 7730 variant.... possibly missing a quad driver or has something added, used on the 89-93 3.3 cars.

--- On Tue, 11/6/12, David Allen <davida1 at hiwaay.net> wrote:

From: David Allen <davida1 at hiwaay.net>
Subject: [Gmecm] ECM compatibility...
To: "GM-ECM" <gmecm at diy-efi.org>, diy_efi at diy-efi.org
Date: Tuesday, November 6, 2012, 3:58 PM

I have an ECM 01228706 and beleive it is a 7730 variant. Is there a list of 
compatible OEM numbers somewhere?

Thanks!
David 

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