Ignition Control Module: Description and Operation

PURPOSE
- The Ignition Control Module (ICM) is incorporated within the Powertrain Control Module (PCM). The ICM receives engine position and speed information from within the crankshaft position sensor and desired spark advance information from the PCM.

OPERATION
- The ICM synthesizes a profile ignition pick up signal and ignition diagnostic monitor signal for use within The PCM.

- The PCM uses this information to determine which ignition coil to fire, calculating the turn ON/OFF times of the ignition coil required to achieve the correct dwell and spark advance.