Celica Liftback L4-107.5 1762cc 1.8L DOHC (7A-FE) (1995)
Igniter: Description and Operation
PURPOSE
The Igniter physically fires the Ignition Coil in response to the engine control module's (ECM) signal.
CONSTRUCTION
The Igniter consists of a power transistor and circuitry to provide a tachometer output.
OPERATION
Computers generally produce low amperage signals as outputs, much lower than necessary to fire the Coil. The Igniter is essentially an electronic
relay. It receives a "trigger" from the ECM and responds by turning a higher amperage current to the Ignition Coil on and off.