Subaru LEGACY 2002 Quick Reference Index page 45

As the crankshaft rotates, each tooth aligns with the crankshaft position sensor. At that time, the
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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.
(1) Crankshaft position sensor
(2) Crankshaft sprocket
SENSORS AND SWITCHES
(1)
(2)
FU-25
Fuel Injection (Fuel System)
A
A: Crankshaft half rotation
B2H1995C