Pathfinder 4WD V6-3.3L (VG33E) (1996)
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Camshaft Position Sensor: Description and Operation
Camshaft Position Sensor
DESCRIPTION
The camshaft position sensor is a basic component of the ECCS. It monitors engine speed and piston position. These input signals to the ECM are
used to control fuel injection, ignition timing and other functions.
Rotor Plate
The camshaft position sensor has a rotor plate and a wave-forming circuit. The rotor plate has 360 slits for a 1° (POS) signal and 6 slits for a 120°
(REF) signal. The wave-forming circuit consists of Light Emitting Diodes (LED) and photo diodes.
The rotor plate is positioned between the LED and the photo diode. The LED transmits light to the photo diode. As the rotor plate turns, the slits
cut the light to generate rough-shaped pulses. These pulses are converted into on-off signals by the wave-forming circuit and sent to the ECM.
