Diagnosing Ignition Control Module

The main function of ignition module is to turn the ignition coil on and off and controlling

duration of current flow through the primary winding of the ignition coil. This allows the spark

plugs to fire at appropriate time according to the number of cylinders the car has.

If your car has stalls or sputters while running, and difficulty while starting there is a chance that

the problem is with the ignition control module. Test the ignition module by using a Digital Volt

Ohm Meter (DVOM) and a 12-volt test light.

Instructions:

Location of the module changes from car to car so check the appropiate manual of your

car, and locate the terminals running in and out of the ignition module.

Turn the ignition on and use DVOM to check for voltage at the ignition module and the

positive terminal of the ignition coil. Place the negative side of your DVOM to a solid

ground and use the positive lead to probe the wires running to the ignition module and to

the ignition coil.

If your DVOM displays that voltage is present at both locations, disconnect the DVOM

leads and set the meter aside. Connect the ground lead from the 12-volt test light to the

negative terminal on the ignition coil. Have your partner crank the engine over many

times. Your test light should flicker on and off. If so, the module is working nicely and

further testing is not required.

If the test light does not flicker on and off, observe the wires running in and out of the

ignition module. Look for melted wire insulation, burn marks and breaks in the wires.

Use wire connectors and splicing tool to repair the defected wires.

Use DVOM to check for an open circuit condition in the primary coil winding. Touch the

negative lead to the negative terminal on the ignition coil, touch the positive probe to the

positive terminal. Set the meter to read ohms. If it displays infinite ohms, the ignition

module is faulty and should be replaced.

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