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)