Ignition Coil: Description and Operation
DESCRIPTIONIgnition Coil:
The ignition coil contains three separate ignition coils which are controlled by the Ignition Control Module (ICM) through three coil leads.
OPERATION
Each ignition coil activates two spark plugs simultaneously:
1. One spark plug on the compression stroke. This spark plug uses the majority of the ignition coil's energy.
2. One spark plug on the exhaust stroke. This spark plug uses very little of the ignition coil's stored energy.
Since these two spark plugs are connected in series, the firing voltage of one spark plug will be negative with respect to ground, while the voltage of the other spark plug will be positive with respect to ground.