Ignition Coil: Description and Operation

Ignition Coil:

PURPOSE
The Ignition Coil Pack is controlled by the Powertrain Control Module (PCM) to provide secondary spark at the correct time in the combustion process.

OPERATION
The ignition coil pack is mounted on the front of the RH cylinder head. The ignition coil contains two separate ignition coils. Each ignition coil is controlled by PCM through two coil leads. Each ignition coil activates two spark plugs simultaneously:

- one spark plug on the compression stroke; this spark plug uses the majority of the ignition coil's stored energy.

- one spark plug on the exhaust stroke; this spark plug will use very little of the ignition coil's stored energy.

These two spark plugs are connected in series, so the firing voltage of one spark plug will be negative with respect to ground and the other spark plug will be positive with respect to ground.