Ignition Timing Control
DESCRIPTION AND OPERATIONBy stopping/flowing the primary current in the ignition coil through ON/OFF control of the ignition power transistor provided in the ignition primary circuit, the ignition timing is controlled so that ignition may take place at the most appropriate time for the operating condition of the engine.
The ignition timing is determined by the ECM in accordance with the engine speed, intake air quantity, engine coolant temperature, etc.