Subaru IMPREZA GD 2007 Series Manual page 2199

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Valve Operation and Air Flow
In the figure below, divided by the diaphragm, the part above X is charged with atmospheric air pressure, and
the part below X is charged with tank pressure. Also, the part above Y is charged with tank pressure, and the
part below Y is charged with canister pressure.
If the atmospheric air pressure port is A, tank pressure port is B, and canister pressure port is C, the air flows
according to pressure difference from each port as shown in the table below.
(b)
(a) Atmospheric pressure
Condition of pressure
A < B (solenoid OFF)
B < C (solenoid OFF)
Solenoid ON
When A < B (solenoid OFF)
(b)
(a) Atmospheric pressure
B
X Y X
(b) Fuel tank
Flow
B → C
C → B
B ←→ C
B
(b) Fuel tank
GD(STI)-132
A
(a)
C
(c)
(c) Canister
A
(a)
C
(c)
(c) Canister
EN-01716
EN-01717