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Camshaft Position Sensor CHC3-A323 / 81322 Hall effect type by NGK The camshaft sensor measures the relative rotational position of the camshaft. This signal - in conjunction with the crankshaft position - is used to determine in which stroke each cylinder is on. The ECU needs the signal to determine when to inject fuel and to trigger the spark plug.The camshaft which is driven by the crankshaft via a timing belt, chain or gears rotates at half the speed of the crankshaft and open and closes the valves. Hall effect sensor Integrated electronic External power supply 5V Square output signal ( 0V / 5V ) Can detect a position even if toothed wheel is at a standstill ( Tooth or Gap ) 3 Pin