•  The PCM determines and controls the optimum fuel injection timing according to engine operation conditions based on the signals from each input sensor.

•  Fuel injection start timing is determined based on the fuel injection amount and crank angle signals input from the crankshaft position sensor.

•  The PCM calculates the optimum fuel injection timing based on the predetermined target fuel injection timing and input signals from each sensor.

•  The basic target fuel injection timing is calculated based on the engine speed and fuel injection amount.

•  The target fuel injection timing is corrected based on the input signal from each sensor, such as the intake air temperature, engine coolant temperature, or barometric pressure.