Aztek V6-3.4L VIN E (2001)
Ignition Coil: Description and Operation
IGNITION COILS AND IGNITION CONTROL MODULE (ICM)
Ignition Coils And Ignition Control Module (ICM)
Three dual tower ignition coils are mounted to the Ignition Control Module (ICM), and are serviced individually. The ICM performs the following
functions:
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The ICM receives and processes the signals from the 7X CKP sensor.
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The ICM determines the correct coil triggering sequence. This coil sequencing occurs at start-up, and is remembered by the IC module. After the
engine is running, the module will continue to trigger the coils in the correct sequence.
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The ICM determines the correct direction of the crankshaft rotation, and cuts spark and fuel delivery to prevent backfiring if this condition occurs.
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The ICM produces and sends low resolution engine speed signals to the PCM.
