1977 DATSUN PICK-UP engine

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

Automatic

Transmission

TROUBLE
SHOOTING
CHART
FOR
3N718
AUTOMATIC
TRANSMISSION

The
number
shown
beluw

indicates
the

sequence
in

which
the

checks
should
be
taken

up

Trouble
ABeD

EFGHIIJKL
MNOP

tnnqr
stuv

wxy

ngine
does
not
start
in
N
P

ranges
2

3
1

Engine
starts
in

other

range
than
N

and

P
1
2

Sharp
shock
in

shifting
from
N

to

0

range

Vehicle
will
not

run
in
D

range
bul

I

TUns
in
2u
l
and
R

ranges
2
4

@

3

5
6
3
7

@
@
2
1
3

Vehicle

will
not

run
in
0
1

2

ranges
bul
runs
in
R

range
1
2

Clutch

slips
Very
poor
acceleration
4

Vehicle
will
nol
run
in
R

range
bul

runs
in
0

2
and
I

r

nges
1
2

Iukh

slips
Very
poor
acceleration
3

5
6
4

@@
1
@
@

Vehicle
will
not
run
in

any
range
1
2
3
5
6
4
1
@
@

Clutches

or
brakes

slip
somewhat

1
2
6

I
3
5
7
4

@@

in

starting

Vehicle
runs
in
N

range
I
3
2

Maximum

speed
not
allained

1
2
4
5
7
6
3
8

OO
I@

Acceleration

poor

Vehicle
braked

by
Ihrowing
Icver
inlo
3

2
1

@

I
@

R

range

I

Excessive

creep
1

No

creep
al

all
I
2
3
5
4

@@

@
1

Failure
10

dumge
gear
from
2nd

I
2
3
5
6
8
7
4

@
@

to
3rd

Failure

tllchJllgC
gear
from
1
1

1
2
3
5
6
8
7
4

@
@
@

to
2ud

Too

high
a

gear
change
poinl
from

I

sC
to
2nd
from

2nd
to
1
2
3
5
6
4
1

3rd

Gear

change
directly
from

lsl
to

2
4

3
1
@

@

rd
occurs

AT

54

Automatic
Transmission

Trouble
ABCD
EFGH
I
J
KL
MNOP

mnqr
s
t
u
v
w
x

y

Too

sharp
a
shock
in

change
from

1
2
4
5
3

@

l1st
to
2nd

Too

sharp
a
shock
in

change
from

1
2
3
3
5
4

@

2nd
to

3rd

Almost
no
shock
or
clutches

slipping
in

change
from
1st

to
1

2
3
4
6
8
7

5

@
@

2nd

Almost
no
shock
or

slipping
in

@
@
@

change
from
2nd
to
3rd
1
2

3
4
6
8

7
5

Engine
races

extremely

Vehicle

braked

by
gear
change
from

2
1

V
@

1st

to
2nd

Vehicle
braked

by

gear
change
from

3
2
1

2nd
to
3rd

Failure
to

change
gear
from

1
3
4
6

5
2

1
@
@

3rd
to

2nd

Failure
10

change
gear
from
2nd

I
3
4

6
5
2

1
@

to
1st
or
from
3rd
to
lIst

Gear

change
shock
felt

during

f
deceleration

by
releasing
1
2
3
4

5
6

accelerator

pedal

Too

high
a

change
point
from

f

3rd
to

2nd
from
2nd
to
I
2
3
4
5

6

1st

Kickdown
does
not

operate
when

depressing
pedal
in
3rd
within

2
1
4
5
3

@
f

kickdown
vehicle

speed

Kickdown

operates
or

engine
over

runs
when

depressing
pedal
in

1

2
3
5
6
7
4

@
@

3rd

beyond
kickdown
vehicle

speed
limit

Races

extremely
or

slips
in

changing
I

from

Jrd
to
2nd
when
1
2
4
6
5
3

f
@
@
@

depressing

pedal

Failure
to

change
from
3rd
to
nd

I
2
4

51
3

@
j

when

changing
lever
into

2

range

Gear

change
from

2nd
10
1st

or
from
2nd
to
3rd
in
2
I
2
3

range

AT
55

Trouble

No
shock
at

change
from
I

to
2

range
or

engine
races

extremely

Failure
to

change
from
3rd
to
2nd

when
shifting
lever
into
I

range

Engine
brake
does
not

upcrate
in

1

range

Gear

change
frum
I

sr
lu

2nd

or
from
2nd
to
3rd
in
I

range

Does
not

change
f

rom

2nd

to
1st
in

range

Large
shock

changing
from
2nd

to
1st
in

range

Vehicle
moves
when

changing

into

P

range
or

parking
gear
does

not

disengage
when
shifted

out
of

P

range

Transmissic
m

overheats

Oil
shoots
out

during
operation

White
smoke
emitted
from
exhaust

pipe

during
operation

Offensive

smell
at
oil

charging
pipe

Transmission

noise
in
p
and
N

ranges

Transmission
noise
in

D
2
I

and
R

ranges
Automatic

Transmission

ABeD
E

F
G
H
I
J
K
L

1M
NO
P

1m
n

q
r
s
t

u
v

Iw
x

y

6
7
5

@
@
I

I
2
3
4
I

I

2
1

57
6

3

@@

@

I

2
4

5
3

@
f

1
2

@

1
2
4567
3

@
2

1
3

@
2
4

I

2

I

3
4

2
6
8
7
5

@@@

Q
@@
@

I
3

5
6
2
7

8
4

@@@
Q
@@

@

1

2

O
G
@@
f
@@

@

1
2

10
I

I

2

0
G
@
@

AT
56

Automatic
Transmission

TROUBLE
SHOOTING
GUIDE
FOR
3N71B
AUTOMATIC

TRANSMISSION

Order
Test
item

Checking
Oil
level

gauge

2
Downshift
solenoid

3

Manuallinkage

L

4
Inhibitor
switch

5

Engine
idling
rpm

6
Vacuum

pressure
of

vacuum

pipe

7

Operation
in
each

range

8

Creep
of
vehicle

Stall
test
I

Oil

pressure
before

tesling
1

2
Stall
test

3
Oil

pressure
after

testing

Road
test
Slow
acceleration

I

st
2nd

2nd
3rd

2

Quick
acceleration

lst
2nd

2nd
3rd

3

Kick
down

operation

3rd
2nd

or

2nd
1st
Procedure

Check

gauge
for
oil
level
and

leakage
before
and

after
each

test

Check
for
sound
of

operating
solenoid
when

depressing

accelerator

pedal
fully
with

ignition
key
ON

Check

by

shifting
into

P
lR
IN
D
2
and
I

ranges
with
selector
lever

Check

whether
starter

operates
in
N
and
p

ranges
only

and
whether
reverse

lamp
operates
in

R
range
only

Check
whelher

idling
rpm
meet

standard

Check
whether

vacuum

pressure
is

more
than
450

mmHg

in

idling
and
whether
it

decreases
with

increasing
rpm

Check
whether
transmission

engages
positively
by
shifting

N
0
N

2
N

l
I
and
N
R

range

while

idling
with
brake

applied

Check
whether

there
is

any
creep
in
D
2

R

ranges
and

Measure
line

pressures
in
D
2
I
and
R

range
while

idling

Measure

engine

rpm
and
line

pressure
in
D
2
I

and

R

ranges
during
full
throttle

operati
n

Notes

a

Temperature
of

torque
converter
oil
used
in
test
should

be
from
600

to
1000C
1400
to
2120F
i
e

sufficiently

warmed

up
but
not
overheated

b
To
cool
oil

between
each
stall
test
for
D
2
I

and
R

ranges
idle

engine
i
e

rpm
at
about
1
200

rpm
for
more
than
1
minute
in
P

range
Measurement

time
must
not
be
more
than
5
seconds

Same
as
item
I

Check
vehide

speeds
and

engine
cpm
in

shifting
up
Ist

2nd

range
and
2nd
Jo3rd
range
while

running
with
lever
in

D

range
and

engine
vacuum

pressure
of
about
200

I11I1lHg

Same

as
item
1
above

except
with

engine
vacuum
pressure

of
0

mmHg
i

e
in

position
just
before
kickdown

Check
whether
the
kickdown

operates
and
measure
the
time

delays
while

running
at
30
40
50
60
70
km
h
18
25
30

37
43
MPH
in

D3
range

AT

57

Automatic
Transmission

Order
Test
item

4
Shift
down

Dr
O2
0

5

Shift
down

DJ
12
1

6
Shift
down

DJ
2

7
Shift

up

I

12

8
Shift

up
or
down
when

start

iog
in

2

range

9

Parking

Others
Abnormal
shock
oil

leakage
Procedure

Check
vehicle

speeds
and

engine
rpm
in

shifting
down
from

3rd
2nd
I

st

sequentially
while

coasting
with

accelerater

pedal
released
in

D3
range
and

engine
vacuum

pressure
of
about
450

mmHg

Check
for

shifting
down

OJ
12
and

engine
braking
and

further
for

shifting
down

12
I
and

engine
braking
after

shifting
the
lever
into

I

range
with
the
accelerator

pedal

released
and
the

engine
vacuum

pressure
of
0

mmHg
while

driving
at
about
50
km
h

30
MPH
in

OJ
range

Check
for

quick
shifting
down

0
2
and

engine
biaking

after

shifting
the

lever
into
2

range
while

driving
at
about

50
km
h
30
MPH
in

OJ
range

Further
check
for

locking
of
the

transmission
in

2nd

gear

ratio

regardless
of
vehicle

speed

Check
for
failure
of
the
transmission
to
shift

up
during

acceleration
when

starting
in
I

range

Check
the
transmission

for
not

shifting
up
or
down

during

acceleration
or
deceleration
when

starting
in

2

rang

Confirm
that
vehicle
will
not
move
on

grade
when

shifting

to

P

range

Enter
into
record
conditions
observed

during
these
tests

such
as

gear
noise

abnormal
clutch
noise
and

acceleration

performance

AT
58

Automatic
Transmission

SERVICE
DATA
AND
SPECIFICATIONS

General

specifications
AfT

Torque
converter

Type

Stall

torque
ratio
Symmetrica13
element
I

stage

2

phase
torque
converter

2
0
I

Transmission

Type

Control
elements

Multiple
disc
clutch

Band
brake

Multiple
disc
brake

One

way
clutch

Gear
ratio

1st

2nd

3rd

Reverse
3

speed
forward
and

one
speed

reverse
with

planetary
gear
train

2

I

I

I

2

458

1458

1

000

2
182

Selector

positions
P
Park

R

Reverse

N
Neutral
Transmission
is

placed
in

neutral

Output
shaft
is

fIXed

Engine
can
be
started

Backward

running

Transmission
is
in

neutral

Engine
can
be

started

Up
or
downshifts

automatically
to

and
from
I

st
2nd
and

top

Fixed
at
2nd

Fixed
at
low

or
downshifts
from

2nd
o
Drive

2
2nd
lock

I
Lock

up

Oil

pump

Type
Internally
intermeshing
involute

gear
pump

Number
of

pump

Oil
Automatic
transmission
fluid

DEXRON

type

5
5

liters

SUU
s

qt
4Ulmp
qt

Approximately
2
7
liters

2UU
s

qt
2XIrnp

qt

in

torque
converter

Controlled

by
measuring
the

nega

tive

pressure
of
intake
manifold

and
the
revolution
of

output
shaft

Forced
lubrication

by
an
oil

pump

Water
cooled

by
a
circulation

type

auxiliary
cooler

located
at
the

radiator
Capacity

Hydraulic
control

system

Lubrication

system

Cooling
system

AT
59

Automatic

Transmission

Engine

Idling
and

stall

revolution

Idling
revolution

Stall

revolution
rpm

rpm
6S0
ai
0

position

2

000
to

2

200

TIghtening
torque

kg
m
ft
lb

Drive

plate
to

crankshaft

Drive

plate
to

torque
converter

Converter

housing
to

engine

Transmission
case
to

converter

housing

Transmission
case
to

rear
extension

Oil

pan
to
transmission

case

Servo

piston
retaine
T

to

transmission
case

Pislon
slem
when

adjuting
band
brake

Piston

stem
lock
nut

One

way
clutch
inner

race

to
transmission

case

Control
valve

body
to

transmission
case

Lower
valve

body
to

upper
valve

body

Side

plat
to

control
valve

body

Nut
for
control
valve

reamer
bolt

Oil
strainer

to
lower

valve

body

Governor

valve

body
to

oil
distribu
tor

Oil

pump
housing
to

oil

pump
cover

Inhibitor
switch
to
transmission

case

Manual
shaft
lock
nut

Oil
cooler

pipe
to
transmission
case

Test

plug
oil

pressure
inspection
hole

Support
actuator

parking
rod

inserting
position
to

rear
extension

I

Oil

charging
pipe
to
case

Dust

cover

to
converter

housing

Selector

range
lever
to
manual
shaft
14

0
to

16
0
101
to

116

4
0
to
5
0

29
to

36

4
0

to
S
O

29
10

36

4
S
to
5
5

33
to

40

2
0
to

S

14
to
18

O
S
to

0
7

4

to
S

O

S
to

0
7
4
to
S

1
2
to
1
5

9
to
11

1
5
to
4
0

I
I

to
29

1
3
to
1

8
9

to
13

0

5S
to
0
75
4
to
S

0
25

to
O
3S

2
to
3

0

25
to

0
35
2
to
3

O

S
to

0
7
4
to
S

0

25
to
0
35

2
to
3

D
S

100
7
4
to
5

0

6
to
0

8
4
to
6

0
5
to

0
7
4
toS

3
0

to
4

0
22

to
29

3
0
to

S
O

22
to

36

I
4to
2
1

10
to
IS

0
8
to
I
1
6
to
8

O
5S
to
0
7S

4
to
S

O
5S
to

0
75
4
to
S

3
0
to
4

0
22
to
29

Turn

back
two

turns
after

tightening

AT
61