asieps_tobira_IM_US.book 135 ページ 2012年1月17日 火曜日 午後3時48分
Diagnostic Trouble Code (DTC) Detecting Criteria
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(H4DOTC)-135
GENERAL DESCRIPTION
A
(a)
C
(c)
(c)
Canister
A
(a)
C
(c)
(c)
Canister
EN-01716
EN-01717