General Information

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.






IGNITION TIMING CONTROL
The ignition power transistor located in the ignition primary circuit turns ON and OFF to control the primary current flow to the ignition coil. This controls the ignition timing in order to provide the optimum ignition timing with respect to the engine operating conditions. The ignition timing is determined by the PCM from the engine speed, intake air volume, engine coolant temperature and atmospheric pressure.