Impreza 2.5 RS Sedan AWD F4-2.5L SOHC (2002)
Camshaft Position Sensor: Description and Operation
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The camshaft position sensor is located on the left-hand camshaft support. It detects the combustion cylinder at any given moment.
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The sensor generates a pulse when one of the bosses on the back of the left-hand camshaft drive sprocket passes in front of the sensor. The ECM
determines the camshaft angular position by counting the number of pulses.
Internal construction and the basic operating principle of the camshaft position sensor are similar to those of the crankshaft position sensor. A total
of seven bosses are arranged at equally spaced four locations (one each at two locations, two at one location, and three at one location) of the
sprocket as shown.
