1992 ecm
Thread Starter
5th Gear
Joined: Nov 2016
Posts: 5
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1992 ecm
Newbie here. I have two 1992 C4s (one is for sale but that's another topic) one of them is having issues which I've traced to the ECM (swapped ECMs and issues transferred to the other car).
As I'm sure everyone here is aware these ECMs are like hens teeth, very difficult to find. My question is can the ECM from a 1991; p/n 12277727, be interchanged for p/n 16159278 if the PROM is changed?
I had read that elsewhere that the two ECMs were very similar.
Sorry if this is a stupid question but I thought I'd ask anyway.
As I'm sure everyone here is aware these ECMs are like hens teeth, very difficult to find. My question is can the ECM from a 1991; p/n 12277727, be interchanged for p/n 16159278 if the PROM is changed?
I had read that elsewhere that the two ECMs were very similar.
Sorry if this is a stupid question but I thought I'd ask anyway.
Thread Starter
5th Gear
Joined: Nov 2016
Posts: 5
Likes: 0
When I use the paper clip method to retrieve codes I get ERR on Mod 4. Like I said when I swapped the ecm with the other car the problem transferred to the other car as well. Hard start, rough running, Service Engine and ASR lights.
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
Do you know specifically what error on module 4? Has this ECM always had the problem or is it a new problem? It could have the wrong MEMCAL in it. Do both of your '92s have the same transmission?
Thread Starter
5th Gear
Joined: Nov 2016
Posts: 5
Likes: 0
New problem (both cars are new to me; vehicle 1 owned since Mar. 2016, 98k miles; vehicle 2 since Aug. 2016, 34k miles), both are Automatic Trans. The problem started on vehicle 2 and transferred to vehicle 1 when I swapped the ECMs, I did not swap the PROMs.
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
I would check and just see that it is a factory PROM/MEMCAL and make sure it is seated fully in the socket. You can also mention to the purchaser that places like SIA Electronics can fix most ECM issues, however they will not fix MEMCAL issues.
Last edited by JimLentz; Nov 22, 2016 at 12:28 PM.
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Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois