Astro Van 2WD V6-4.3L VIN X (2002)
Ignition Control Module: Description and Operation
IGNITION CONTROL MODULE (ICM) AND IGNITION COILS
The ICM is connected to the PCM by an Ignition Control (IC) circuit. The ICM also has a ground circuit and shares an ignition 1 voltage supply with the
ignition coil. The coil driver in the ICM controls current through the ignition coil based on signal pulses from the PCM. There is no back-up or by-pass
function in the ICM.