
B-70315EN/02 9.LASER SOFTWARE FUNCTION
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VEN : Exhaust valve
TWV : Three-way valve
PCV : Gas pressure control valve
(3) When all valves are closed, the pressure in the discharge tube
(DGN905) is sampled, and sampled data is preserved as
diagnosis information in DGN954 through DGN957. The
pressure in the discharge tube is first sampled 30 seconds after all
valves are closed, then is sampled three times at intervals of 1/3
of the leakage determination time. DGN954 through DGN957
are cleared when the leakage check mode is set.
(4) Upon completion of the last sampling operation, the
all-valve-closed signal (AVCL) is turned off, and a purge
operation is performed. When the purge operation is completed,
the leakage check mode signal (LCKMD) is also turned off.
RUN=OFF
Evacuation time
PRM 15256
+75 seconds
AVCL=1
30
seconds
Ts
seconds
Ts
seconds
Ts
seconds
Leakage determination time PRM 15154
T=3Ts seconds
Completion of purge
Pchk1
(DGN954)
Pchk2
(DGN955)
Pchk3
(DGN956)
Pchk4
(DGN957)
LSTR
Gas pressure
Time
Leakage check mode