Ignition Coil: Description and Operation

WARNING: THE ELECTRONIC IGNITION SYSTEM GENERATES APPROXIMATELY 40,000 VOLTS. PERSONAL INJURY COULD RESULT FROM CONTACT WITH THIS SYSTEM.

Ignition Coil Packs:

The electronic ignition system uses two epoxy filled coil packs mounted on a bracket at the rear of the engine. The coil pack on the left side, contains three separate coils and fires cylinders 1, 2, 3, 4, 6, and 7. The coil pack on the right side, contains two individual coils and fires cylinders 5, 8, 9, and 10. When one of the coils discharges, it fires two cylinders at the same time (one cylinder on its compression stroke, the other on its exhaust stroke).

The Powertrain Control Module (PCM) energizes the individual ignition coils in each pack. The PCM can determine cylinder identification from the crankshaft position sensor and camshaft position sensor inputs.