•  The PCM controls fuel injection timing by driving the timer control valve (TCV) installed to the FIP to change the fuel pressure on the timer piston and move the timer piston position.

•  The PCM determines the optimal injection timing based on each input signal, and then determines the opening angle of the TCV according to the injection timing.

•  The PCM is driven by the injection-timing signal (ON/OFF signal) from the PCM. When the injection-timing signal is ON, the injection timing is advanced under any of the following conditions.