Camshaft Position Sensor (3.7L)
Camshaft Position (CMP) sensor is mounted on right front corner of right cylinder head. See Fig 1 . The CMP sensor contains a Hall Effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects notches located on a tonewheel. The tonewheel is located at the front of the camshaft for the right cylinder head. See Fig 1 . As the tonewheel rotates, the notches pass through the sync signal generator. The signal from the CMP sensor is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders. When the leading edge of the tonewheel notch enters the tip of the CMP sensor, the interruption of magnetic field causes the voltage to switch high, resulting in a sync signal of approximately 5 volts. When the trailing edge of the tonewheel notch leaves then tip of the CMP sensor, the change of the magnetic field causes the sync signal voltage to switch low to 0 volts.