Description

The ignition timing is controlled by the electronic spark advance control system. Standard reference spark advance data for engine operating conditions are preprogrammed in the ECM (Engine Control Module) memory. Engine operating conditions (engine speed, load, warm-up status, etc.) are detected by various sensors. Based on these sensor signals and the ignition timing data, the primary current interrupt signals are sent to the ECM. The ignition coil is activated and the timing is controlled.