C 1500 Truck 2WD V6-4.3L VIN X (2003)
Ignition Control Module: Description and Operation
IGNITION COIL AND ICM
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.
