Ignition Coil: Description and Operation

IGNITION COILS

Each ignition coil contains a solid state driver module as its primary element. The engine control module (ECM) signals the coil driver to initiate a firing event by applying ignition control (IC) circuit current for the appropriate time, or dwell. When the current is removed the coil fires the spark plug. The ignition coils use the following circuits:
- An ignition 1 voltage supply circuit
- An IC circuit
- Two ground circuits