General System Description
PURPOSEThe control system consists of sensors which detect various engine conditions, and an electronic control module (ECM) which determines the injection volume and injection timing based on the signals from the sensors.
OPERATION
The various sensors detect the air intake volume, engine speed, oxygen density in the exhaust gas, engine coolant temperature, air intake temperature and atmospheric pressure etc., and convert the information into electrical signals which are sent to the ECM. Based on these signals, the ECM calculates the optimum ignition timing and fuel injector ON (open) duration and timing for the current conditions.
The ECM not only controls the fuel injection timing and ignition timing, but also the self diagnostic function which records the occurrence of a malfunction, idle speed control, fuel pressure control, intake air control, exhaust gas control, EVAP control, EGR control and fuel pump control, which switches between the high and low fuel pump speeds according to varied load conditions.