Ignition Control Module: Description and Operation

Ignition System Circuit Diagram:

This vehicle is equipped with a distributorless ignition system. The Igniter, located on the right side inner fender, 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:

Crank angle sensor "Ne" signal
Crank angle sensor "G" signal
Ignition switch ("START" position)
Water thermosensor
Airflow meter
Throttle sensor
Neutral and clutch switches
Diagnosis connector (for base timing adjustment)