Ignition Control Module: 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 to the firewall above the brake booster.

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.