3
Jit
f
ng
valve
24
1
3
L
l
r
I
Js
I
i
ilr
t
pressure
6
when
shif
ing
from
3rd
to
2nd
at
D
range
Thus
the
throttle
of
line
pressure
6
reduces
the
shock
generated
fro
shifting
A
plug
in
the
SSV
left
end
readjust
the
throttle
piessu
e
I
6
which
varies
depending
on
the
engine
throttle
con
dition
to
a
throttle
pressure
19
suiled
to
the
sp
ed
change
control
Moreover
the
plug
is
a
valve
which
applies
line
P
esspre
13
in
lieu
of
the
throttle
pressure
to
the
SSV
and
the
FSV
when
kickdowri
is
performed
When
the
throttle
pressure
16
is
applied
to
the
left
side
of
this
plug
and
the
plug
is
epressed
toward
the
right
a
slight
space
is
formed
from
the
throttle
pressure
6
10
19
A
throt
tIepressu
19
w
1iFh
is
lower
by
the
pressure
loss
equivalent
to
this
space
is
rH
1
Pressure
Odifier
valve
PMV
I
Compared
to
the
operating
pressure
required
in
starting
th
vehicle
the
ppwer
trimsinitting
capacity
of
the
clutch
that
is
required
operating
pres
sure
may
be
lower
when
the
vehicle
is
once
started
When
the
line
pressure
is
retained
at
a
high
level
up
to
a
high
vehicle
speed
shock
gerieraled
from
the
shirring
increases
arid
the
oil
pump
loss
also
jncrdases
In
order
to
prevent
his
the
t
lrott
le
pressure
must
be
l
hanged
over
with
the
operation
of
the
governor
pressure
15
to
reduce
Ihe
line
pressure
The
PMV
is
used
for
this
purposc
Automatic
Transmission
generated
the
piessure
loss
is
adde
d
to
the
spring
force
and
the
plug
is
lhus
forced
back
from
the
right
to
the
left
When
this
pressure
19
increases
ex
cessively
the
plug
is
further
depressed
toward
the
left
space
from
the
lhrot
tle
pressure
19
to
the
drain
circuit
13
increases
and
the
throttle
press
ure
19
decreases
Thus
the
plug
is
balanced
imd
the
throttle
pressure
19
is
reduced
to
Ii
certain
value
against
the
throttle
pressure
6
Wheri
performing
kickdowri
the
SDV
moves
a
high
line
pressure
is
led
to
the
circuit
19
from
the
line
pressure
circuit
13
which
had
been
drained
the
plug
is
forced
toward
the
left
and
circuit
19
becomes
equal
to
the
line
pressure
13
I
W
15
I
A
TOgS
Fig
iT
13
2nd
3rd
shift
vallJe
I
When
the
governor
pressuie
IS
which
is
applied
to
the
right
side
of
the
PMV
is
low
the
valve
is
forced
toward
the
right
by
the
throttle
ines
sure
16
applied
to
the
area
differ
ence
of
the
value
and
the
spring
foice
and
t
he
circuit
from
circuit
16
to
circuit
18
is
closed
However
when
vehicle
speed
increases
andl
the
gaver
nor
pressure
15
exceeds
a
certain
level
the
governor
pressure
toward
the
left
which
is
applied
to
the
right
side
exceeds
the
spring
force
and
the
throt
tle
pressure
16
toward
thc
right
the
valve
is
depressed
loward
the
lefi
and
the
throttle
pressure
is
led
from
circuit
AT
9
16
to
circuit
18
This
throttle
pressure
18
is
applied
to
the
top
of
the
PRV
and
the
force
of
the
line
pressure
source
7
is
reduced
Contra
rily
when
the
vehicle
speed
decreases
arid
the
governor
ipressure
15
de
creases
the
force
toward
the
fight
exceeds
ithe
governor
pressure
the
valve
is
forced
back
toward
the
right
and
the
throttle
pressure
18
is
drained
to
the
spring
unit
This
valve
is
sWitched
when
the
throttle
pressure
and
the
governor
pressure
are
high
or
when
tIiey
are
both
Tow
i
i
I
11
18
16
n
r
I
I
15
AT099
Fig
AT
14
Pre
ure
modifier
valve
Vacuum
thro
le
valve
VTV
The
vacuum
t
rottle
valve
is
a
regula
tor
valve
whiCh
uses
the
line
pressure
7
for
the
pressure
source
and
regulates
the
throttle
pressure
16
I
which
is
proportioned
t
the
force
of
the
vacuum
diaphragm
The
vacuum
dia
phragm
yories
depending
on
the
engine
throt
le
condition
negative
pressure
in
the
inta
e
line
When
the
line
pressure
7
is
ap
plied
to
the
bottom
through
the
valve
hole
and
the
v
a
ve
is
forced
upward
space
from
the
line
pressure
7
to
the
throttle
pressure
16
is
dosed
and
the
space
from
the
Ihrottle
pressure
16
to
the
drain
circuit
17
is
about
to
open
In
this
operation
the
throttle
pressure
16
becomes
lower
than
the
linep
s
ureY
btthe
p
e
sur
9
iv
alenl
of
the
loss
of
space
and
Ihe
force
depressing
tlie
rod
if
the
vaeuum
diaphragm
is
balanced
wit
Ii
thethrot
tie
pressure
16
a
pplied
upward
tOlthe
bottom
When
the
erigine
torque
is
high
Ihe
negative
pressure
in
the
intake
iirie
rises
tending
ioward
atmospheric
pressure
and
the
force
of
the
rod
to
depress
the
valve
increases
As
a
result
the
valve
is
depressed
downward
the
