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Home >> Chevrolet >> 2002 >> Express 1/2 Ton Van V8-5.7L VIN R >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Relays and Modules - Ignition System >> Ignition Control Module >> Description and Operation
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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.
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