What causes the ECM to stop communicating?
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Joined: Mar 2013
Posts: 361
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From: pardeeville, wi
Car: 1991 Pontiac Firebird convertible
Engine: 3.1 soon to be 3.4/3100
Transmission: 700r4
Axle/Gears: original gears, for now
What causes the ECM to stop communicating?
I have a 1991 Firebird Convertible 3.1L. I bought this car in November. I'm trying to get it running again but I have no injector pulse. After a bunch of searching around I hooked up the scan tool.
Not only do I not have injector pulse the ECM isn't seeing the Throttle position, RPM, neutral safety switch and it thinks the collant is -39 degrees F.
Also the check engine, battery, security are all dark. the only light on the dash that comes on is the airbag light.
All under dash fuses OK'd with a test light and Ignition module replaced.
Any ideas?
would be derfered
Not only do I not have injector pulse the ECM isn't seeing the Throttle position, RPM, neutral safety switch and it thinks the collant is -39 degrees F.
Also the check engine, battery, security are all dark. the only light on the dash that comes on is the airbag light.
All under dash fuses OK'd with a test light and Ignition module replaced.
Any ideas?
would be derfered 
Joined: Nov 2008
Posts: 2,108
Likes: 183
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: What causes the ECM to stop communicating?
I'd be looking for a bad ground or bad fuseable link. Something somewhere is not making the contact it should for all those problems to happen.
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