Ignition Coil: Description and Operation

DESCRIPTION






The ignition coil transforms battery voltage on the ignition coil primary circuit into about 28 K volts on the ignition coil secondary circuit each time the ignition coil receives a signal from the Ignition Control Module (ICM).

CONSTRUCTION
The ignition coil contains three separate ignition coils which are controlled by the 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. The other 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:
1. The firing voltage of one spark plug will be negative with respect to ground.
2. The voltage of the other spark plug will be positive with respect to ground.