Fig.1) This shows waveform of Crank Shaft Position Sensor and Cam Shaft Position Sensor simulatneously. The circled area in the center indicates the reference points of Crankshaft Position Sensor and Camshaft Position Sensor.

Fig.2) Crankshaft Position Sensor and Camshaft Position Sensor signals are measured simultaneously.

For every Camshaft Position Sensor signal, two Crankshaft Position Sensor signals are outputted. LOW and HIGH outputs of Camshaft Position Sensor reference point are detected at the Crankshaft Position Sensor reference point.

(Injection sequence is determined based on LOW and HIGH signals of Camshaft Position Sensor reference point for detecting cylinder position.)