Ignition Control Module (ICM)

The ICM is mounted to the ignition coil. See Fig 1 . Based on control system inputs, the ECU triggers ignition coil via the ICM. The ECU is able to advance or retard ignition timing by controlling ignition coil through the ICM.

Fig 1: Ignition Control Module (Monaco & Premier 3.0L)

Courtesy of CHRYSLER MOTORS.