The compact ignition coil pack consists of two ignition coils with two high voltage outputs each. The block is installed directly above the spark plugs. The dual ignition coil has two independent primary and two secondary windings. Each output of the secondary winding is connected to a candle.
The ECU has two power stages and alternately controls each primary winding of the ignition coils. Based on information from the speed sensor and crankshaft position, the ECU selects cylinder pairs ½ or ⅔.