How do you test a GM ignition module?

Clip the negative test light lead to a solid ground such as negative battery terminal. Ask a partner to crank the engine numerous times. The test light should turn on and off as the ignition control module is signaled. If no light is preset, the module is faulty and needs to be replaced.

What is the ignition module for?

The ignition control module (ICM) gathers information from a triggering device (usually the crankshaft position sensor or camshaft position sensor) to determine your vehicle’s base ignition timing. It is responsible for switching the ignition coil(s) on and off to fire the spark plugs.

What is a GM module?

The GM 7 /8 pin modules have been used in a wide variety of GM engines from 4 cylinder to V8s (small and big block). They were designed to be used with throttle body injection and port injection motors and provide automatic coil current limiting (7.5 amps was the GM specification) and automatic dwell control.

What is Ignitor module?

An ignition control module is a component that can regulate spark generation in many internal combustion engines. The main purpose of the ignition module is typically to open or close a ground circuit to the primary winding inside the ignition coil.

How do you test a GM ignition module with a multimeter?

Place the red lead of the multimeter on the positive coil terminal. Place the black lead to the battery negative terminal. Turn on the ignition switch to the “Run” position. The multimeter should read battery voltage at the positive terminal.

What is the difference between an ignition coil and ignition module?

An ignition coil is the coil in a vehicle’s ignition system used to convert sufficient voltage to spark the spark plugs. The ignition control module helps manage the electrical current used by the ignition coil.

Does a transmission control module need to be programmed?

Does a transmission control module need to be programmed? When you install a new transmission control module in these vehicles, it must be programmed with dealer-level equipment. Your vehicle must also be towed to the dealership for the programming process to be completed.