Subaru Impreza WRX (2004) ignition coils are made integral with an igniter. 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 igniter supplies current to an and the supplies high-voltage current to a pair of spark plugs (#1 and #2 or #3 and #4) simultaneously. The following schematic illustrates the Subaru Impreza WRX Wiring Diagram.

Subaru Impreza WRX Ignition Coil Wiring Diagram

(1) ECM
(2) Igniter
(3)
(4) Spark plug #1
(5) Spark plug #2
(6) Spark plug #3
(7) Spark plug #4
(8) Ignition switch



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