Subaru LEGACY 2006 Manual page 560

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Diagnostic Trouble Code (DTC) Detecting Criteria
2. COMPONENT DESCRIPTION
Pressure control solenoid valve
PCV controls the fuel tank pressure to be equal to the atmospheric air pressure. Normally, the solenoid is set
to OFF. The valve opens and closes mechanically in accordance with the pressure difference between tank
and atmospheric air, or tank and canister.
The valve is forcibly opened by setting the solenoid to ON at the time of diagnosis.
(b)
(1) Solenoid
(2) Diaphragm
(1)
(3)
(2)
(3) Valve
(4) Spring
GD(H4SO)-123
GENERAL DESCRIPTION
(a)
(4)
(c)
(a) Atmospheric pressure
(b) Fuel tank
(c) Canister
EN-01715