![]() ![]() ![]() And well, not only does it need the CKP sensor signal, it needs 12 Volts and Ground. OK, moving on along, for the ignition module to create this Switching signal, it needs to receive a Cran kshaft Position (CKP) sensor signal (this signal is usually referred to as the Triggering signal and in GM service literature it's known as the 3X or 7X CKP signal). The ignition module accomplishes this ‘switching’ ON and OFF, of the Primary Current, by simply interrupting (turning off) the Ground path. Now, before I go any further and if you're wondering what the heck is a ‘Switching signal’, this name simply refers to the fact that the ignition control module ‘switches’ the primary current flowing thru' the ignition coil ON and OFF (Primary Current is the fancy name for the 12 Volts that flow thru' the ignition coil). It's this Switching signal that makes the ignition coils create spark. In a nutshell, the ignition control module's job is to create a Switching signal for the ignition coils that are sitting on top of it. Basic Theory: How The Ignition Control Module Works Below you'll find some ‘working theory’ (don't worry, just the nuts and bolts of how everything works), do's and don'ts, and some other good stuff you may want or need to know. ![]() Before I jump into the specific tests, I recommend you read this part of the article. This is a very easy and straightforward test that can be accomplished in 3 steps. To see the complete list of 3.1L, 3.4L test articles, go to the GM 3.1L, 3.4L Index Of Articles. GM 3.8L Ignition Control Module and Crank (3X, 18X) Sensor Test.If you need to test the 3.8 ignition control module:.How To Test The Ignition Coil Packs (GM 3.1L, 3.4L).If you need to test the 3.1L, 3.4L Coil Packs:.There are two other articles that may help: You can find this tutorial in Spanish here: Cómo Probar El Módulo de Encendido Y Sensor Del Cigüeñal (GM 3.1L, 3.4L) (at: ). Where To Buy The Ignition Module Or CKP Sensor And Save.TEST 3: Testing For The Crankshaft Position Sensor Signal.TEST INFO: Circuit Descriptions Of The Ignition Module.Do's And Don'ts And Safety Precautions.Symptoms Of A Bad Ignition Control Module Or CKP Sensor.Basic Theory: How The Ignition Control Module Works. ![]()
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