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Ignition Coil: Description

The ignition power transistor functions to control the ignition timing by controlling the ignition coil primary current through signals from the ECU. The ignition coil has the firing order of (#1/#4), (#2/#5), (#3/#6) and is controlled by the power TR built in the ECU.

Fig 1: Locating Ignition Coils

Courtesy of KIA MOTORS AMERICA, INC.