Impreza Outback Sport AWD F4-2.5L SOHC (2002)
Crankshaft Position Sensor: Description and Operation
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The crankshaft position sensor is installed on the oil pump which is located in the front center portion of the cylinder block. The sensor generates a
pulse when one of the teeth on the perimeter of the crankshaft sprocket (rotating together with the crankshaft) passes in front of it. The ECM
determines the crankshaft angular position by counting the number of pulses.
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The crankshaft position sensor is a molded type which consists of a magnet, core, coil, terminals and other components as illustrated.
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As the crankshaft rotates, each tooth aligns with the crankshaft position sensor. At that time, the magnetic flux in the sensor's coil changes since the
air gap between the sensor pickup and the sprocket changes. This change in magnetic flux induces a voltage pulse in the sensor and the pulse is
transmitted to the ECM.
