Direct Ignition System

PCM sends sequential low current signals (one for each coil) to the Ignition Control Module (ICM). ICM in turn grounds each coil in proper sequence and time. Spark plugs are fired directly by coils mounted on each spark plug.

PCM uses input signals from Top Dead Center (TDC), Cylinder Position (CYP) and Crankshaft Position (CKP) sensors for basic ignition timing. In addition, ignition timing is influenced by throttle position sensor, coolant temperature sensor and MAP sensor.