Camshaft Position Sensor

Camshaft position sensor may be referred to as Camshaft Position (CMP) sensor. Camshaft position sensor is located on top of timing chain cover, just below thermostat housing. End of camshaft position sensor is located directly above camshaft sprocket. A notched ring is mounted on front of camshaft sprocket.

As camshaft rotates, camshaft position sensor generates pulses due to notch areas on the notched ring. When solid metal area on notched ring passes below camshaft position sensor, voltage decreases to less than .5 volt. When notch on notched ring aligns with bottom of camshaft position sensor, voltage increases to 5 volts. Switching of the voltage generates pulses. These pulses provide an input signal to Powertrain Control Module (PCM). PCM uses input signal along with input signal from crankshaft position sensor for determining crankshaft position for fuel injection synchronization and cylinder identification.