Subaru 2002 Impreza Service Manual page 71

SENSORS AND SWITCHES
Fuel injection (Fuel System)
E: CRANKSHAFT POSITION SENSOR
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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 de-
termines 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 below.
(1) Terminal
(2) Yoke core
(3) Magnet
NF0024
(4)
Coil
(5) Core
(6) Cover
FU-21