Fuel Control: Notes

The purpose of the fuel control system is to deliver the correct amount of fuel to the engine under all operating conditions. Fuel is delivered by the fuel injectors which are controlled by the PCM. The PCM checks Engine Coolant Temperature (ECT) and Throttle Position (TP) sensor to determine proper air/fuel ratio for starting. PCM changes the air/fuel ratio to the engine by modifying fuel injector pulse width. Fuel system operates in one of 2 modes: open loop or closed loop.