Ignition System: Description and Operation

GENERAL INFORMATION
Ignition timing is controlled by the Engine control module (ECM). The ignition timing data for the engine operating conditions are programmed in the memory of the ECM.

Engine operating conditions (speed, load, warm-up condition, etc.) are detected by the various sensors. Based upon these sensor signals and the data stored in the ECM, signals to interrupt the primary current are sent to the power transistor. The ignition coil is activated and timing is controlled at the optimum point.