Fuel Injection Control System

The injector drive times and injector timing are controlled so that optimum air/fuel mixture is supplied to engine. Fuel is sent under pressure from the fuel tank by the fuel pump. Fuel pressure is regulated by the fuel pressure regulator. The regulated fuel is distributed to each of the Multiport Fuel Injection (MFI) injectors. Fuel injection is normally carried out once for each cylinder for every two rotations of the crankshaft. The ECM provides a richer air/fuel mixture by carrying out "open-loop" control when the engine is cold or operating under high load conditions in order to maintain engine performance. In addition, when the engine is warm or operating under normal conditions, the ECM controls the air/fuel mixture by using the heated oxygen sensor signal to carry out "closed-loop" control in order to obtain the theoretical air/fuel mixture ratio that provides the maximum cleaning performance from the 3-way catalytic converter.