Ignition Control Module: Description and Operation

Ignition System Schematic:

PURPOSE
The igniter physically fire the ignition coil in response to the ECU signal. Computers generally produce low amperage signals as outputs, much lower than necessary to fire the coil.

LOCATION
Mounted to the ignition coil at the front left corner of the engine.

CONSTRUCTION
The igniter consists of a power transistor and circuitry to provide a tachometer output.

OPERATION
The igniter is essentially an electronic relay. It receives a "trigger" from the ECU and responds by turning a higher amperage current to the ignition coil on and off. Each time a spark is produced an ignition confirmation (IGF) signal is sent to the ECU.