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Automatic Transmission
LINE
PRESSURE
GOVERNOR
FEED PRESSURE
At cut
back
point
After
cut
back
Throttle
opening
under
approximately
over
approximately
15
kmfh
10
MPH
35
kmfh
22 MPH
Unit
mmHg
Unit
kgfcm2
psi
Unit
kgfcm2
psi
Full throtlle
0
9
4 to
11
0
134
to
156
5
5
to
6
5
78
to
92
Minill1um
throttle
450
3
0
to
4
0
43to
57
3 0
to
4 0
43
to
57
Fulllhrotlle
0
10
0 to 12 0
142
to
171
5
5
to
7 0
78
to
100
Minimum
throttle
450
6 0
to
12 0
85to171
5 5
to
7 0
78
to
100
Full throtlle
0
14 0
to 16
0
199
to
228
14 0
to
16 0
199
to
228
Minimum throttle
450
3 0
to
5 5
43
to
78
3 0
to
5
5
4
lo
78
Range
D
2
R
Notes
a
The line pressure
during
idling corresponds
to
the oil pressure before
cut
down
at
minimum throttle
b
The
oil pressure
After
cut
back
means
that after the pressure modifier valve has
operated
JUDGEMENT
IN
MEASURING
LINE PRESSURE
Low
idling
line pressure
in
the
ranges
D
2
I
R
and pH
This
can
be atlributed
to
trouble
in
the pressure
supply
system
or
too
low
output
of power
caused
by
I
A
worn
oil pump
2
An
oil
pressure leak
in
the oil
pump valve
body
or case
3
A
sticking regulator
valve
2
Low
idling
line pressure
in
cer
tain
ranges
only
This
is
presumably
caused
by
an
oil
leak in the devices
or
circuits
con
nected
to
the relevant ranges
I
When there
is
an
oil leak
in
the
rear
clutch
and
governor
the line
pressure in
D
2
and
I
are
low
but the pressure
is
norrrial in
R
2
When
an
oil leak
occurs
in
the
low and
reverse
brake
circuit
the line
pressure in
R
and
P
are
low but
the pressure
is
normal
in
D
2 and
I
3
High idling
line pressure
This is
presumably
caused
by
an
increased
vacuum
throttle
pressure
owing
to
a
leak
in
the
vacuum
tube
or
dia
phragm
or
by
an
increased
line
pressure
due
to
a
sticking regulator
valve
Vacuum
leakage
is
checked
by
directly measuring
the
negative
pres
sure
after
removing
the
vacuum
pipe
A
puncture
of the
vacuum
dia
phragm
can
be
easily
ascertained
because
the
torque
converter
oil
is
absorbed
into
the
engine
and the
exhaust
pipe
emits
white
smoke
4
Items
to
be checked when the
line pressure
is
increasing
In
this check
the line pressure
should be measured with
vacuums
of
450
mmHg
and 0
mmHg
in
accordance
with the stall
test
procedure
I
If
the
line pressure do
not
n
crease
despite
the
vacuum
decrease
check
whether
the
vacuum
rod
is
incorporated
2
If the line pressure do
not
meet
the standard
it is caused
mostly by
a
sticking
pressure
regulating
valve pres
sure
regulating
valve
plug
or
amplifier
TROUBLE
SHOOTING
CHART
INSPECTING
ITEMS
1
Inspection
with
automatic
trans
mission
on
vehicle
AT
53
A
Oil level
B
Ra lge
select
linkage
C
Inhibitor switch
and
wiring
D Vacuum
diaphragm
and
piping
E Downshift
solenoid
kickdown
switch and
wiring
F
Engine
idling
rpm
G Oil
pressure
throttle
H
Engine
stall rpm
I
Rear lubrication
J
Control valve manual
K Governor valve
L Band
servo
M Transmission
air
check
N Oil
quantity
o
Ignition
switch
and starter motor
P
Engine
adjustment
and brake
in
spection
2
Inspection
after
inspecting
auto
matic transmission
on
vehicle
m
Rear clutch
n
Front clutch
q Band brake
r
Low and
reverse
brake
s
Oil pump
t
Leakage
of oil passage
u
One
way
clutch of
troque
coilVerter
v
One
way
clutch of transmission
w
Front clutch check ball
x
Parking
linkage
y
Planetary
gear
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