Ignition Control Module

The ignition control module (ICM) (12K072) receives the CKP signal from the crankshaft position sensor (CKP sensor) (6C315) . The ignition control module will:

• Use the missing tooth portion of the CKP signal to synchronize the ignition coils (12029) for the proper spark timing sequence.
• Also use the CKP signal for creating the Profile Ignition Pickup (PIP) signal.

The PIP signal is sent to the powertrain control module (PCM) (12A650) where it will be used for:

• Base ignition timing calculations.
• RPM calculations.

The ignition control module will also receive the Spark Angle Word (SAW) signal from the powertrain control module . The ignition control module will use the SAW signal to calculate the proper spark timing advance.

When all the signals are calculated, the ignition control module will determine the proper "ON" and "OFF" time of the ignition coils for spark delivery.