We'll first check for the basics like battery voltage and engine Ground to the ignition control module (ICM). Whether you use a multimeter or an oscilloscope, you'll be able to successfully diagnose this no-start condition! So, read on my friend. If you have access to an oscilloscope, I've included photos of what the wave-forms should look like. If you don't have a digital multimeter that can read Hertz frequency? Click here to see my recommendations: Buying A Digital Multimeter For Automotive Diagnostic Testing. ![]() This article concentrates on using a multimeter capable of reading frequency Hertz (Hz). One is using an oscilloscope and the other is using a multimeter. There are several ways to test all of these signals. On an oscilloscope, it produces an analog waveform. The crankshaft position sensor is a Magnetic Reluctor type sensor and produces an AC signal that can be measured with a multimeter (in AC Volts mode). This sensor goes thru' the block itself (I'll be either using the full name: crankshaft position sensor or the short form: CKP sensor thru' out the article). Thus the two ignitions coils start to spark away.Īs you can see, the CKP sensor signal is critical for the ECM and ignition control module to start sparking the ignition coils at START UP and at all engine speeds.These two Ignition Control (IC) signals contain the data the ignition module needs to know the exact moment to start switching the primary current of the ignition coils ON and OFF.These two signals are usually called Electronic Spark Timing Control Signal A and Electronic Spark Timing Control Signal B in the GM service literature. The ECM, upon receiving this 7X REFERENCE signal, returns to the ignition module an Ignition Coil Control signal thru' two different circuits.This digital signal is called the 7X REFERENCE signal.The ignition control module upon receiving this AC Volts crank signal, converts it into a DC digital signal and sends it to the ECM.When the engine starts to crank, the crankshaft position sensor starts to produce and send its signal to the ignition control module (ICM).How? Well here (in a nutshell) is the breakdown of what happens: In a nutshell, when the system is working properly, at crank-up and at all engine speeds, the fuel injection computer (ECM Electronic Control Module or PCM Powertrain Control Module) controls both ignition coils thru' the ignition control module. Here is a little background information to help you diagnose this no-spark condition. Why? because the tests in this article assume that none of the ignition coil towers are sparking. In view of this, this article will take you step by step thru' 5 different test steps so that you can eliminate a lot of these possibilities.īut the fact remains, that if your Cavalier or Sunfire has spark, this test will not help you. These two components could display any number of behaviors when they go bad. Of course, when it comes to ignition system failures, this is not an absolute truth. Therefore, the second symptom that leads you on the path of a bad ICM or crank sensor is: no spark at any of the ignition coils. Now, if the no-start is caused by the ignition module or the crankshaft position sensor, usually the ignition coils will not fire any spark at all. Now, of course a lot of things can cause this exact same problem, so this isn't very helpful. ![]() The number one complaint (symptom) when the ignition control module or crankshaft position sensor goes bad is the car won't start. Symptoms Of A Bad Ignition Control Module And Crank Sensor (CKP) You can find this tutorial in Spanish here: Cómo Probar El Módulo De Encendido De Chevrolet y Pontiac 2.2L (at: ). To see all of the GM 2.2L 'How To Test' Articles, you can go here: GM 2.2L Main Index Of Articles. How To Test The GM Ignition Coil Packs: 2.2L Chevrolet Cavalier and Pontiac Sunfire.If you need to test the ignition coils sitting on top of the ignition control module, on your 2.2L Cavalier or Sunfire, go here: How To Test The Ignition Module And Crank Sensor (GM 2.4L).If you need the ignition control module test for the 2.4L Quad 4 engine, go here: If you're wondering what years of Cavalier or Sunfire this info applies to, check the "Applies To:" box on the right column (desktop) or at the bottom (mobile device). Here, you'll find the most straightforward test to check to see if the ignition control module is bad or if the crankshaft position sensor is bad. If you've been wondering how you can test your ignition control module (ICM) on your 2.2L Chevy Cavalier or Pontiac Sunfire? Well, you've come to the right place.
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