Ignition System: Description and Operation

Ignition spark is produced by individual on-plug coil units.
Each on-plug coil unit also comprises an amplifier module. The ECM controls each amplifier module which in turn switches the coil primary to generate the HT voltage within the secondary winding.

Ignition System
The ignition system consists of eight ignition coils, one per spark plug, each incorporating an amplifier module which is controlled by one of two outputs from the ECM. Each output of the ECM controls four of the spark plug mounted ignition coils, two on each bank.
The 14 mm spark plugs, one per cylinder, locate in recesses along the center-line of each cylinder head. The on-plug ignition coils are secured to the camshaft covers and each on-plug coil has its own plastic cover.