Can a GM ignition control module be used?
The ignition control module (ICM) and ignition coil tests in this article assume that your vehicle is Cranking but NOT STARTING due to a NO SPARK Condition. If you’re GM car or truck starts and runs, this article will not help you.
What happens when the ICM fails on a GM car?
Generally, when the ICM or the ignition coil fails, your GM car or truck will Crank but NOT START. Specifically, the ignition coil will not spark.
How does the distributor mounted ignition module work?
In a nutshell, when you crank up the engine (and the system is working properly): The distributor shaft starts to rotate, inducing the pick up coil to start generating its magnetic signal. This pick up coil signal is sent directly to the ignition control module.
When does a GM V6 ignition module fail?
This is a crank sensor code that sets when the crankshaft position sensor reports data out of range to the vehicles main computer or control module. They designed these ignition control modules and GM V6 ignition coils to last for the life of the vehicle. Unfortunately, the definition of this term changed throughout the decades.
When did GM replace the ignition control module?
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In a nutshell, when you crank up the engine (and the system is working properly): The distributor shaft starts to rotate, inducing the pick up coil to start generating its magnetic signal. This pick up coil signal is sent directly to the ignition control module.
How does the ignition switch work on a GM car?
The ignition switch now talks to the body control module (BCM) and it’s the BCM that initiates one of two relays. The second relay, the more important of the two, is controlled by the powertrain control module (PCM). And it only operates the starter relay after it’s satisfied that the correct key is in the ignition.
Can a GM ignition control module go high and dry?
The original equipment GM ignition control module can go a long way before it leaves you high and dry. When I say high and dry I’m talking about a vehicle that cranks around, but will not fire up. Most of the original modules installed in Chevrolet distributors from the mid-80s through the mid-90s shared the same solid-state design.
