ECM or mem cal (prom)????
Thread Starter
Racer
Joined: Aug 2002
Posts: 405
Likes: 0
From: hamilton ontario
ECM or mem cal (prom)????
I was driving today all of a sudden service ASR and SERVICE ENGINE SOON lights came on permanent along with the SYS and SECURITY flashing about every 5 - 10 seconds also the temp and oil gauge on the led read LO as long as the SYS was flashing .
Any ideas
Thanks Mike
Any ideas
Thanks Mike
Intermediate
Joined: Oct 2003
Posts: 36
Likes: 0
From: Central NJ
Sounds like a similar issue I'm fighting right now. There's a lot of good info about ECM/CCM issues already out there, but you can check out what I've been doing and see if it helps at all: http://forums.corvetteforum.com/show....php?t=1465039
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
It's always a good idea to post what year your car is.
The ECM/PCM changed in '94.
When I had this problem, the symptoms, after the engine warmed up, were:
1) SES light on.
2) Security light flashing.
3) C68 climate control LED blinking.
4) ASR light on.
5) If a scan-tool was connected when the problem exhibited itself, there was a "communications failure" on the serial link.
My problem was corrected by replacing the ECM.
A key symptom was the car ran fine until the engine warmed up and heated the ECM under the hood.
This seems to be a common problem with the ECM before the '94 model.
Since this problem is intermittent, it isn't unusual to get a refurbished ECM with the same problem. The technician checks it on the bench for some time and doesn't find a problem, so he checks it off as good and it is resold -- problem and all.
Tom Piper
The ECM/PCM changed in '94.
When I had this problem, the symptoms, after the engine warmed up, were:
1) SES light on.
2) Security light flashing.
3) C68 climate control LED blinking.
4) ASR light on.
5) If a scan-tool was connected when the problem exhibited itself, there was a "communications failure" on the serial link.
My problem was corrected by replacing the ECM.
A key symptom was the car ran fine until the engine warmed up and heated the ECM under the hood.
This seems to be a common problem with the ECM before the '94 model.
Since this problem is intermittent, it isn't unusual to get a refurbished ECM with the same problem. The technician checks it on the bench for some time and doesn't find a problem, so he checks it off as good and it is resold -- problem and all.
Tom Piper
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
Originally Posted by Alvin
They are really tough to find right now. At one point I had like 5 laying around here.
The CCM is discontinued.
The ECM is hard to find.
Sounds like it could get difficult to keep a '92 or '93 on the road.
Is the F-body ECM in the '93 the same as the '92 and '93 Y-Body?
Tom Piper
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