System Description
CMP sensor detects REF signal and POS signal.
- REF signal: 6 pulses / 1 revolution of camshaft. Each of REF signals has different wavelength. Based on REF signal, ECM (PCM) judges which cylinder is at TDC.
- POS signal: 360 pulses / 1 revolution of camshaft. Each of POS signals has equivalent wavelength. Based on POS signal, ECM (PCM) judges the wavelength of REF signals, engine speed and piston position.