Cavalier/Z24 L4-138 2.3L DOHC VIN D MFI (1995)
Ignition Control Module: Description and Operation
Ignition Module Operation
OPERATION
The Ignition Control Module (ICM) monitors the Crankshaft Position (CKP) sensor signals, and based on these signals sends a 7X reference
signal to the Powertrain Control Module (PCM) so the correct spark timing and fuel injector control can be maintained during all crank and run
conditions. Since the PCM controls spark timing and ignition control during crank and run, there is no bypass mode.
