Ignition Coil and Spark Plug
IGNITION COIL
The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil secondary circuit.
SPARK PLUG
The spark plug is installed to the cylinder head and performs ignitions to air-fuel mixture by discharging ignition coil-applied voltage in the gap between the center electrode and the ground electrode and generating sparks in the combustion chamber.