Ignition Control Module

The Ignition Control Module (ICM) is mounted to the ignition coil. See Figure . Based on control system inputs, the ECU will trigger the ignition coil via the ignition control module. The ECU is able to advance or retard ignition timing by controlling the ignition coil through the ignition control module.

The ICM consists of a solid-state ignition circuit, an integrated ignition circuit and an integrated ignition coil, that if necessary, can be removed and serviced separately. The ICM receives input signals from the ECU and has only 2 outputs. The tach output signal to the tachometer and diagnostic connector, and the high voltage output signal from coil to distributor cap.