Impreza 2.5 RS Sedan AWD F4-2.5L SOHC (2002)
Ignition Coil: Description and Operation
Ignition coils are made integral with an ignitor.
The ignition system is of a dual-ignition-coil design, each coil causing two plugs to generate sparks simultaneously. In response to the signal from the
ECM, the ignitor supplies current to an ignition coil and the ignition coil supplies high-voltage current to a pair of spark plugs (#1 and #2 or #3 and #4)
simultaneously.
