MR2 L4-132 2164cc 2.2L DOHC (5S-FE) (1993)
Igniter: Description and Operation
PURPOSE
The igniter physically fires the ignition coil in response to the ECM's signal. 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.
LOCATION
Mounted inside the distributor in the engine compartment.
CONSTRUCTION
The igniter consists of a power transistor and circuitry to provide a tachometer output.
OPERATION
Computers generally produce low amperage signals as outputs, 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.