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How to test my icm

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Old Feb 24, 2020 | 08:48 PM
  #1  
bensbaby's Avatar
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Joined: Apr 2008
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From: Smiths Falls
Car: 1988 GTA Trans am 1 owner since new
Engine: 383 built
Transmission: 1995 camaro t56 6 speed
Axle/Gears: 3.24 posi 9 bolt
How to test my icm

I have a 88 gta
My fuel inj are not firing
so it's easier a new computer
or a new icm
my question is
how to test the icm with a meter
ty
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Old Feb 25, 2020 | 07:28 AM
  #2  
ironwill's Avatar
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Joined: Jan 2008
Posts: 1,332
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Car: 1986 IROC Z
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 3.23 Posi
Re: How to test my icm

GM ignition module testing
https://easyautodiagnostics.com/gm/4...ed-icm-tests-1
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Old Feb 25, 2020 | 10:00 AM
  #3  
gw082008's Avatar
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Joined: Apr 2010
Posts: 58
Likes: 1
From: Waxahachie, TX
Car: 92 Firebird Convertible
Engine: 383 - First Fuel Injection TPI
Transmission: 700R4
Axle/Gears: 3:23
Re: How to test my icm

If you wish to bench test your ICM you can use the website in the previous post.
If you have a spare coil use the attached wiring diagram and install temporary wiring from the ICM to the coil input - then hook the coil up directly to a spark plug. Simulate a signal to the ICM pins (the distributor pickup coil input) a 12V battery will do. Applying the signal should fire the spark plug.
Be sure to provide a return path for the spark plug.
Attached Files
File Type: pdf
ECM 3 Vin 8.PDF (1,010.1 KB, 164 views)
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Old Feb 25, 2020 | 12:33 PM
  #4  
bensbaby's Avatar
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Member
 
Joined: Apr 2008
Posts: 446
Likes: 3
From: Smiths Falls
Car: 1988 GTA Trans am 1 owner since new
Engine: 383 built
Transmission: 1995 camaro t56 6 speed
Axle/Gears: 3.24 posi 9 bolt
Re: How to test my icm

So the icm only controls spark not fuel injector firing ??
I have spark
the only thing that control's fuel inj firing is the ecu ??
I thought a guy online told me the icm did both

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Old Feb 25, 2020 | 01:01 PM
  #5  
bensbaby's Avatar
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Member
 
Joined: Apr 2008
Posts: 446
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From: Smiths Falls
Car: 1988 GTA Trans am 1 owner since new
Engine: 383 built
Transmission: 1995 camaro t56 6 speed
Axle/Gears: 3.24 posi 9 bolt
Re: How to test my icm

A few weeks ago
I started up my car and just let it idel for 20 mins in winter here
and when I came out it was full of smoke
I opened the door and it was pouring around electsmoke bad so It stank bad
that only ever happened 1 time in my life in my other car 93 awd turbo eclipse that blew the computer same **** smoking crazy
but it was because it had a shorted out iac valve with blew the computer

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Old Feb 25, 2020 | 01:02 PM
  #6  
bensbaby's Avatar
Thread Starter
Member
 
Joined: Apr 2008
Posts: 446
Likes: 3
From: Smiths Falls
Car: 1988 GTA Trans am 1 owner since new
Engine: 383 built
Transmission: 1995 camaro t56 6 speed
Axle/Gears: 3.24 posi 9 bolt
Re: How to test my icm

I'm gonna get a new computer right now 135 cdn with me luck
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