Ignition Timing Control System

Ignition timing control system uses ECM to control timing and firing of cylinders based on signals from various engine sensors. ECM activates power transistors so ignition occurs, taking into consideration operating conditions of engine. Optimum ignition timing control is determined by making preset corrections for engine coolant temperature, intake air temperature and other conditions of ignition advance angle, which are preset according to engine operating conditions. Turbocharged engines have a knock sensor that corrects ignition advance angle according to presence or absence of engine knocking.