Ignition Control Module: Description and Operation

Igniter Circuit Diagram:

The Igniter, located near the coil on the left side of the engine compartment, is a switching device that activates the primary ignition coil circuit. The ECU determines optimum ignition timing from various inputs and transmits a primary current "OFF" signal to the igniter to control ignition timing.

The ECU calculates input from these devices to control ignition timing:

Distributor Ne signal
Water thermosensor
Airflow meter
Throttle sensor
Neutral and clutch switches (M/T)
Inhibitor switch (A/T)
Ignition switch ("START" position)
Diagnosis connector (for base timing adjustment)
EC-AT control unit