Ignition Timing Control System (2.0L)

On 1.8L engine, ignition timing control system is composed of various sensors, Electronic Control Unit (ECU) and power transistor. Depending on engine operating conditions, ignition timing control system functions to regulate ignition timing and current flow time of primary current, assuring good ignition performance. The on/off switching of the primary current flowing in the ignition coil is performed by power transistor, which in turn is regulated by ECU.

On 2.0L engines, ignition timing control system uses Electronic Control Unit (ECU). The ECU judges which cylinder is to be fired at what time, based on signals coming from various engine sensors. The ECU 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. Engines with turbochargers have a knock sensor that corrects ignition advance angle according to presence or absence of knocking.