[Gmecm] ECM compatibility 1228706 1227730...

[David Allen]

Well - the verdict is in! The 8706 appears to support the same program that the 7730 will run.

Car: 1988 Cutlass Ciera XC / 2.8 MPFI Turbo engine / 125C transmission
Chip: BFAU $A1

Removed 1227730 ECM.
Installed 1228706 ECM with car's original chip.

There was no detectable change in any of the following areas:

Engine performance
Accessory function (A/C coolong fans etc) 
Datalink (ALDL) function

So there you have it. Assuming the chip program is functional (not in limp-mode) these 2 ECM's appear to be interchangable. 

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.

  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.

  I keep having things "come up" and haven't tried plugging it in yet!

  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.

  Thanks,
  David

  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














    ----- 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.

          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.

            Sincerely,
            David.

              ----- 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

                    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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