ECM repair
Thread Starter
Burning Brakes
Joined: Mar 2006
Posts: 891
Likes: 18
From: Dayton Ohio
ECM repair
Well I am going to have to do it. I have figured out that the computer problems that I am having with my car are the result of serial communication drop out from the ECM. Thus the only data that I can get from the ECM is flashing trouble codes when something is wrong. So if I want to start scanning my ECM (I just built my cable) I am going to have to fix it or replace it.
I have observed this problem to be intermittent. This is typical for a loose connection or partially failed semiconductor device. I have been in mt ECM a couple of times and can see no signs of corrosion or damage. Also I cannot locate any schematics so I have decided to go ahead and change out all of the 220 package amps since they are more prone to failure than most of the other components.
I would like to ask you all if anyone out there has a diagram of any kind for a 92 LT1 ECM?
Have any of you performed any ECM repairs before? I have done a repair on a Ford one once so I am not afraid of the task ahead.
Any other advice?
I have observed this problem to be intermittent. This is typical for a loose connection or partially failed semiconductor device. I have been in mt ECM a couple of times and can see no signs of corrosion or damage. Also I cannot locate any schematics so I have decided to go ahead and change out all of the 220 package amps since they are more prone to failure than most of the other components.
I would like to ask you all if anyone out there has a diagram of any kind for a 92 LT1 ECM?
Have any of you performed any ECM repairs before? I have done a repair on a Ford one once so I am not afraid of the task ahead.
Any other advice?
Thread Starter
Burning Brakes
Joined: Mar 2006
Posts: 891
Likes: 18
From: Dayton Ohio
Dude, They were out of stock...only offer to send mine in to rebuild
Seriously... I opened it up again and decided it was going to be a lot more difficult than trading out a couple of IC's. I am at the point now that I would buy one but they are not available. I may have to attempt a repair but it would be nearly impossible without a schematic. That little golden piece of info seems to be non-existant.
The hunt continues.
Matt
Burning Brakes
Joined: Apr 1999
Posts: 1,161
Likes: 0
From: Texas
Here's a shot in the dark for you. Are there any electrolytic caps inside the ecm? Those buggers get old and dry out after a few years. I have fixed the power supply twice on my router by just replacing one of the electrolytics. They start out light blue in color and the plastic case turns dark brown when they go bad from heat.
good luck
good luck
Racer
Joined: Sep 2007
Posts: 393
Likes: 0
From: Bartonville Illinois
92 an 93 use the same ECM. They were also used on LT1 Camaros, Firebirds, SS Impalas and I guess some Cadillacs. You just have to locate a ECM with the proper part number and install your Prom.
Good luck finding schematics. GM repairs ECM and won't give out the prints. Everything has to be reversed engineered by outsiders.
I bought a replacement from a 92 or 93 Camaro and it was very clean.
Good luck finding schematics. GM repairs ECM and won't give out the prints. Everything has to be reversed engineered by outsiders.
I bought a replacement from a 92 or 93 Camaro and it was very clean.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
PCM repair
Here is a link for PCM repair. This is the most detailed one I have found with interesting tech info (and I have looked). Even though it is for the PCM, the ECM is similar and some of the repair processes might be applicable.
http://www.akmcables.com/
Click on the words “repair PCMs”, that will offer the interesting technical information.
http://www.akmcables.com/
Click on the words “repair PCMs”, that will offer the interesting technical information.
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Race Director
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
Here is a link for PCM repair. This is the most detailed one I have found with interesting tech info (and I have looked). Even though it is for the PCM, the ECM is similar and some of the repair processes might be applicable.
http://www.akmcables.com/
Click on the words “repair PCMs”, that will offer the interesting technical information.
http://www.akmcables.com/
Click on the words “repair PCMs”, that will offer the interesting technical information.
Drifting
Joined: Oct 2004
Posts: 1,477
Likes: 80
From: Hawaii
Just took some pics of my spare "Cardone " rebuilt ECM. Got this one off E Bay.
There is a chip or I'm not too sure what you call that piece, that is burnt. Would I be able to buy that item and repair the ECM?
Pics of front and back of ECM card....
There is a chip or I'm not too sure what you call that piece, that is burnt. Would I be able to buy that item and repair the ECM?
Pics of front and back of ECM card....
Racer
Joined: Sep 2005
Posts: 304
Likes: 1
From: Carson City Nevada
Burning Brakes
Joined: Oct 2001
Posts: 1,135
Likes: 17
I've stumbled across this page wich contains some information.. http://chevythunder.com/199394_lt1_schematic_page_1.htm
Cruising
Joined: May 2008
Posts: 13
Likes: 0
Hi,
I have the same ECM as James93LT1 above.
Can someone tell me the "trick" to removing the circuit board from its metal housing. I am having ECM problems, and would like to replace the electrolytic capacitor that I can see on the board.
I have removed the 4 screws that hold the memcal door, removed four more screws with rubber washers, removed 4 "sheet metal"-style of screws in the front around the plugs, and four "star" screws that are also near the plugs.
Something still seems to be holding the unit together. Can anyone help?
I have the same ECM as James93LT1 above.
Can someone tell me the "trick" to removing the circuit board from its metal housing. I am having ECM problems, and would like to replace the electrolytic capacitor that I can see on the board.
I have removed the 4 screws that hold the memcal door, removed four more screws with rubber washers, removed 4 "sheet metal"-style of screws in the front around the plugs, and four "star" screws that are also near the plugs.
Something still seems to be holding the unit together. Can anyone help?
