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#1989 gmc safari battery trminal bolts how to#

It's with the Bypass Signal that the computer starts to retard and advance ignition timing with the IC Signal. OK, once the fuel injection computer receives the Distributor Reference Hi Signal, it starts activating the fuel injectors and above 400 RPM, starts to send a 5 Volt Bypass Signal to the ignition control module.As you might already know, it's this ‘Switching Signal’ that makes the ignition coil start sparking away. Also, after receiving the pick up coil signal, the ignition control module starts to switch the primary current (of the ignition coil) ON and OFF.This digital signal is called the: Distributor Reference Hi Signal in the majority of the service literature. The ignition module, upon receiving this pick up coil signal (for all intended purposes it's a crankshaft position sensor signal) converts it to a digital signal that is now sent to the fuel injection computer.This pick up coil signal is sent directly to the ignition control module.The distributor shaft starts to rotate, inducing the pick up coil to start generating its magnetic signal.In a nutshell, when you crank up the engine (and the ignition system is working properly): Here is a little background information (and I stress ‘little’) explained in plain English, to help you diagnose the no-start no-spark condition affecting your vehicle. The typical ignition system circuit diagram for the 1992-1995 4.3L, 5.0L, and 5.7L 1500, 2500, 3500 Pick Up and Suburban can be found here: Ignition System Circuit Diagram (1992-1995 Chevy/GMC Pick Up And SUV).

#1989 gmc safari battery trminal bolts how to#

If you need to test the 7 pin (older) ignition module, the following tutorial will help: How To Test The Ignition Control Module (2.8L V6 GM). You can find this tutorial in Spanish here: Cómo Probar El Sistema De Encendido (GM 4.3L, 5.0L, 5.7L) (at: ).

How To Test A Misfire / No Spark-No Start Condition (4.3L, 5.0L, 5.7L 96-04).

GM Engine Compression Test (GM 4.3L, 5.0L, 5.7L) (at: ).

How To Diagnose Misfire Codes (GM 4.3L, 5.0L, 5.7L) (at: ).

How To Test The ‘Spider’ Fuel Injector Assembly (GM 4.3L, 5.0L, 5.7L) (at: ).

The following tutorials will also help you: Some of the images in this article show them off of the vehicle just to make it easier to explain their testing process. You'll test the following components: ignition control module, spark plug wires, distributor cap and rotor and ignition coil and pick up coil of the GM 4.3L, 5.0L, 5.7L and 7.4L distributor type ignition system.īefore we start, just want to remind you that since this is an on-car test, do not remove the ignition control module from the distributor or the ignition coil. This article will walk you step by step thru' the testing and diagnostic of a MISFIRE or NO-START condition.

Now, AutoZone can test it for you (if you remove it and take it to them), but for those of you that can't afford the time this involves or for those who want to add another diagnostic technique to their ‘toolbox’ of know-how, this article is for you. Not only that, you don't need any expensive tools to do it. The GM distributor mounted ignition control module (ICM), can be tested on the car or truck easily.