Distributor: Description and Operation

Ignition System:

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

LOCATION
Mounted near ignition coil.

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 ECM 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 ECM.