ECM Replacement
Thread Starter
Racer
Joined: Jul 2004
Posts: 468
Likes: 28
ECM Replacement
I am about to replace the ECM on my 1992 LT1. Do I only need to unbolt the old one and disconnect the wires and then install the new one. Or, does the ECM need to be programmed? Is there a chip that needs to be transferred from the old one to the new one?
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
You need to keep the original MemCal (EPROM), that is under a cover on the under-side of the ECM, to put in the new ECM.
First step, disconnect the negative battery terminal.
Then, unbolt the ECM and take the connectors off.
Then, remove the original MemCal and install in the new ECM.
Finally, install the new ECM.
Tom Piper
First step, disconnect the negative battery terminal.
Then, unbolt the ECM and take the connectors off.
Then, remove the original MemCal and install in the new ECM.
Finally, install the new ECM.
Tom Piper
Thread Starter
Racer
Joined: Jul 2004
Posts: 468
Likes: 28
ECM replacement.
Thank you. I was getting a nonstart (cranking but fuel shutdown) with a code 41 and the ASR service light on. This morning I cooled the ECM (with ice in a zip lock bag) and the car started immediately with no trouble lights on. So I figured I would just replace the ECM. Any opinions?
Race Director
Joined: Apr 2004
Posts: 17,066
Likes: 3
From: Milpitas ca
Originally Posted by c2c4c6
Thank you. I was getting a nonstart (cranking but fuel shutdown) with a code 41 and the ASR service light on. This morning I cooled the ECM (with ice in a zip lock bag) and the car started immediately with no trouble lights on. So I figured I would just replace the ECM. Any opinions?
When I get the ASR light on, I pull the key out and re-insert. Sometimes I have to do it two or three times before ASR is not lit.
Once ASR light is not lit , Car starts up fine.
I also changed out my ECM and it helped for a month or two before problem came back. May have to look for new chip.
Advanced
Joined: Feb 2004
Posts: 72
Likes: 0
From: Huntsville Alabama
Originally Posted by c2c4c6
Thank you. I was getting a nonstart (cranking but fuel shutdown) with a code 41 and the ASR service light on. This morning I cooled the ECM (with ice in a zip lock bag) and the car started immediately with no trouble lights on. So I figured I would just replace the ECM. Any opinions?
