Subaru 2002 Impreza Service Manual page 36

SENSORS AND SWITCHES
Fuel Injection (Fuel System)
D: CRANKSHAFT POSITION SENSOR
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.
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-20