Century V6-3.1L VIN J (2005)
Ignition Control Module: Description and Operation
IGNITION CONTROL MODULE (ICM) AND IGNITION COILS
Three dual tower ignition coils are mounted to the ICM, and are serviced individually. The ICM performs the following functions:
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The ICM receives and processes the signals from the CKP sensor B.
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The ICM determines the correct direction of the crankshaft rotation, and cuts spark and fuel delivery to prevent damage from backfiring if reverse
rotation is detected.
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The ICM determines the correct coil triggering sequence, based on the 7X CKP signal. This coil sequencing occurs at start-up, and is remembered
by the ICM. After the engine is running, the ICM will continue to trigger the coils in the correct sequence.
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The ICM produces and inputs 3X reference signals to the PCM.
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The ICM contains the coil driver circuits that command the coils to operate.
