Celica L4-122 1998cc 2.0L DOHC Turbo (3S-GTE) (1990)
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Igniter: Description and Operation
Ignition System
The igniter, located near firewall, center of engine compartment, is an electronic switching device used by the ECU to control coil firing. When the ECU
has calculated optimum timing, it signals the igniter to interrupt current flow in the coil primary windings, inducing high voltage from the coil secondary
windings. By controlling igniter switching, the ECU regulates ignition timing based on inputs received from various sensors.
