check engine DATSUN B110 1973 Service User Guide

CHASSIS

Trouble

shooting
guide
for

3N71B
Automatic
Transmission

Order
Test
item

Checking
Oil

level

gauge

2
Downshift
solenoid

3

ManuaIlinkage

4

Inhibitor
switch

5

Engine
idling
rpm

6
Vacuum

pressure
of
vacuum

pipe

7

Operation
in
each

range

8

Creep
of
vehicle

Stall
lest
Oil

pressure
before

testing

2
Stall
test

3

Oil

pressure
after

testing

Road
test
Slow
acceleration

Ist
2nd

2nd
3rd

2

Quick
acceleration

Ist
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

by
sound
whether
solenoid

operates
when

depressing

accelerating
pedal

fully
with

ignition
key
ON

Check

changing
conditions
into

P
R

N
D
2

and
I

ranges
by
moving
selector
lever

Check

whether
starter

operates
in
N

and
tp

ranges
only

and
whether

reverse

lamp
operates
in
R

range
only

Check
whether

idling
rpm
meet
standard

Checking
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
o
D
N
2
N
I

and
N
R

range

while

idling
with
brake

applied

Check
whether
there

is

any

creep
in
D
2
I
and

R

ranges

2
1

and
R
range
Measure
line

pressures
in
D

while

idling

Measure

engine
rpm
and
line

pressure
in
D
2
I

and

R

ranges
during
fullthrallIe

operation

Notes

a

Temperature
of

torque
converter
oil

used
in
test
should

be

from
600
to
lOOoC

1400
to
2120F
i
e

sufficiently

warmed

up
but
not
overheated

b

For

cooling
oil

between
each
stall
test
for
D
2

1

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
secon

Same
as
the
item
I

Check
vehicle

speeds
and

engine

rpm
in

shifting
up
1st

2nd

range
and
2nd
J
3rd

range
while

running
with

lever
in

D

range
and

engine
vacuum

pressure
of

about
200

mmHg

Same
as

the
item
1
above

except
with

engine
vacuum

pressure
of
0

mmHg
i
e
in

position
just
before
kick

down

Check
whether
the
kick
down

operates
and

measure
the

time

delays
while

running
at
30
40
50

60
70
km
h

19

25
31
38
44
MPH
in
D

range

AT
58

Order

Others
AUTOMATIC
TRANSMISSION

Test
item

4

Shift
down

Dr4D2
DI

5

Shift
down

DJ
I2
l

6
Shift
down

DJ
2

7

Shift

up

I

12

8
Shift

up
or

down
when
start

ing
in
2

range

9

Parking

Abnormal
shock
oil

leakage
Procedure

Check
vehicle

speeds
and

engine
rpm
in

shifting
down
3rd

2nd
I

st
continued

while

coasting
with

acceleraling

pedal
released
in

0

range
and

engine
vacuum

pressure
of

about

450

mmHg

Check
for

shifting
down

DJ
12
and

engine

braking
and

further
for

shifting
down

12
11
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
SO
km
h
31

MPH
in

DJ
range

Check
for

quick

shifting
down

DJ
2
and

engine
braking

after

shifting
the
lever
into

2

range
while

driving
at
about

50
km
h
31
MPH
in

DJ
range

Further
check

the
transmission
for

being
locked
to
the

2nd

gear
ratio

regardless
of
vehicle

speed

Check
for
the

transmission
not

shifting

up
during
acceIera

tion
when

starting
in
1
t

nge

It

Check
the
transmission

for
not

shifting

up
or
down

durih
t

acceleration
or

deceleration
when

starting
in
2

range

Confirm
that
vehicle
will
not
move
on

grade
when

shifting

to
P

range

Put
on

record
of
observed
conditions

during
these

tests

such

as

gear
noise

abnormal
noise

of
clutches
and

acceleration

performance

AT

59

Tightening
torque

3

way
connector
1
5

to
1
8

kg
m

10
8
to
13
0
ft
lh

1
5
to
1
8

kg
m

10

8
to
13

0
ft

lh

1
5
to
1
8

kg
m

10

8
to
13

0
ft

lb

0

7
to
0
9

kg
m

5
1
to
6
5

ft
1b
Master

cylinder

Brake
hose

Air
bleeder

5

Fill
the

master

cylinder
brake

fluid
reservoir
with

brake
fluid
and

perform
air

bleeding
complele1y

Note
a
Do
not
use

brake
fluid
other
than

specified

b
The

specified
brake
fluid
is
used
for

both

single

and
tandem

type
master

cylinders

6

Upon

completion
of
air

bleeding
make

sure
that
the

brake

operates
correctly
and
check
the
brake
tube
and

hose
connectors
for
fluid

leaking
Fully
depress
the

brake

pedal
continue
to

depress
the
brake

pedal
for
several

seconds
and
make
sure
that
no
brake

fluid
leaks
from

any

part
of
the
brake
line

Replace
defective

part
if

required

Brake
line

pressure
differential

warning

light
switch

A

warning
light
is

located
on
the
instrument

panel
to

warn
the
driver
when

a

pressure
difference
of
13

to
17

kg
cm2
185
to

2421bJsq
in
exists
between
the

front
and

rear
b
rake

systems

A

hydraulically
actuated

warning
light
switch

is
located

in

the

engine
compartment
Both
front
and
rear
brake

systems
are
connected
to
this
switch
assembly

When

a

pressure
difference
of
13

to
17

kgJcm2
185
to

242

lbJsq
in
occurs
between
the
front
and
rear

brake

systems
the
valves

will
shuttle
toward
the
side
with
the

low

pressure
The
valve
contacts
with
the
switch
terminal
BRAKE

the

ground
circuit

for
the

warning
light
is

completed
and

thus
the

warning
light
lights

In
this

case
correct
the

hydraulic
brake

problem
and

bleed
the
brakes

Check
the

warning
light
switch

assembly
for
a

proper

operation
Check
the
switch

assembly
for
fluid

leakage

Note
Do

not

attempt
to

repair
switch
for

any
reason

replace
switch

assembly
completely

1
To
front
brake

L
H

2

From
master

cylinder
F

3
From
master

cylinder
R
4
To
rear
brake
L
B
R
M

5
To
front
brake
R
H

Fig
BR
12

Warning
light
switch

r

I

@

I
I
3

I
Valve

assembly

4

Piston
load

spring
Wire
terminal

Brake
tube

Fig
BR
13
Sectional

view

of

warning
light
switch

BR
7

BODY

b

Method
2

Start
the

engine
and
turn
on
the
window

defogger
system
With
a
d
c

voltmeter

setup
shown
in

Figure
BF

70
check
each
heat
wire

for

discontinuity

If

the
meter
indicates
12
volts

or
0
on

a

specific
wire

that

line
is
broken
Normal
indication

6
volts

A

break
in
that
line
can
then

be
detected

by
moving

the

positive
lead

of
meter

along
the

line
until

an

abrupt

variation
in

the
meter
indication
is

encountered

Fig
BF
70

Checking
for
broken
heat
wire

with
d
c
voltmeter

c

Method
3

With
an
ohmmeter

setup
shown
in

Figure

BF
7l
locate
one

lead
on
each
end
of
a
heat
wire
and

the

other
in
the
rniddle
section

of
that
wire
If

the

meter

registers
on

a
specific

grid
line
a

value
twice
as

much
on

any
other
line
that

line
is
broken

A

break
in
that

line
can
then
be

located

by
an

abrupt

variation
in
the

meter
indication
as
the
test

lead
moves

along
the
broken
heat
wire

r

I

I

I

J

I

I
v

Ejl

Fig
BF
71

Checking
for
broken

heat
wire
with

ohmmeter
2

Repair

a

Repair
equipment

1
Conductive
silver

composition
Dupont
No
4817

2
Ruler
30

em

11
81

in

long

3

Drawing

pen

4
Heat

gun

5

Alcohol

6
Cloth

b

Repair
procedure

1

Wipe
clean
broken
heat
wire
and
its

surrounding

area

with
a
cloth

dampened
in

alcohol

2

Apply
a

small
amount
of

conductive
silver

composi

tion

to
the

tip
of

drawing

pen

Note
Shake
silver

composition
container

sufficiently

before
use

3

Place
ruler
on

glass
along
broken
line

to
be

repaired

as

shown
in

Figure
BF

72

Deposite
conductive

silver

composition
to
break
line
with

drawing

pen

Slightly
overlap
existing
heat
wire

either
side
5
mm

0
1969
in

preferable
of
the

break

Heat
wire
0
en

0
0

d
ci

1
I
Break

I
1

I

kr

I
I

Ruler

Drawing

pen

Unit
mm

in

Fig
BF
72

Locating
ruler
in

position

8F

35

INSPECTION

Referring
to
the

wiring
diagram
check
the

wiring

harness

for
connection
with
electrical

equipment
and

connector
for
conned
ion
and
installation
When

checking

the

wiring
harness

note
the

following
matters

Connected
unit
should

not
be

loose
rusted
or

contaminated

2

Cable
insulator
cover
should
not
be

damaged
crack

ed
or

insulating
material

should
not
be
deteriorated

3
For
those

parts
which

are

grounded
through
the

installation

bolts
the
bolts
should
be
in
contact
with
the

body
completely
so
that

continuity
is

provided
in

between
the

body
and
bolts

4
Terminals

of
unit

through
which

current
flows

should
not
come

into
contact
with

other
metal

parts

5
No

erroneous
connection
should
be

present

DESCRIPTION

When
an
overcunent

exceeding
the
rated

amperage

flows
to
a
circuit
the

fuse
is
heated
and
melted
the

circuit
is

interrupted
and

thus
cables
and

electrical

equipment
are

protected
from

damaging
due
to

burning
or

damaging
is

limited
to
the

minimum
This
vehicle

is

equipped
with
six

fuses
and

one
fusible
link
The
fuses

are

located

in
the

fuse
box
and
used

to

protect
illumination

signal
and
other

systems
and
the
fusible
link
is

adopted

in
the
cable
between
the

battery
and
alternator
to

protect

the

charging
and

starting
circuits

FiJ
BE
16
Fuse
box
BODY

6
Cables
should
be

damped
so
that

they
do
not
come

into
contact
with

sharp
corner
or

part
lernperature
of

which

rises

highly

7
Cables
should
be

securely
clamped
in

posItions

sufficiently
separated
from

rotating
parts
such
as
fan

pulley
fan
belt

etc

8
Cables
should
be

provided
with
an

optimum
extra

length
at
sections

stationarity
on
the

body
or
at
sections

where
vibration

occurs
due
to

engine
operation
and

others

Note
a
When

inspecting
or

performing
other
mainte

nance

service
and
no

power
supply
is

required

particularly
or
when
it
is

anticipated
that
a

part

may
be
short
circuited
disconnect
the

battery
H

terminal

b
In
no
event
should
an
unloaded
circuit
be

directly
connected
with
ground
Be
sure
to
use
a

test

lamp
or
circuit

tester

fUSE

Fig
BE
17
Fusible
link

INSPECTION

In
the

most

cases
fuse
can
be

checked

visually

However
when

it
is
difficult
to

check

visually
a
circuit

tester

may
be
used

The
fusible
link
can

be

inspected

visually
or

by

feeling
on

finger

tip
However
the
fusible

link
can
be

inspected
more

correctly

by
using
a
circuit

tester

BE

6

BODY

ELECTRICAL

Main

high
beam
Defective
dimmer
switch

cannot
be
switch

ed
to

dimmer

low
beam

or

vice

versa

Head

lamps
dim
Defective

light
circuit

Head

lamps
dim

Partly

discharged

battery

when
the

engine

is

stopped
or

op

era
ted
under

idling
speed
Defective

battery

Head

lamps
still

Faulty
sealed
beam
unit

dim
with

engine

run

above

idling

speed

Faulty
charging
system

Head

light
in

only

one
side

lights
Faulty
head

lamp
terrnianl
con

tact

Defective

lamp

Turn

signal
lamps

Probable

Condition

cause

All
turn

signal
Blown

fuse
or

faulty
contact

lamps
do
not

light
When
red

yellow
cable
is
con

nected

to
red

white
cable
or

red
black

cable
and

the
main

beam
or

dimmer
beam

lights

the
circuit
is

nonnal
The
dimmer

switch
is
defective

Check
the
head

light
circuit

for

cable

being
about
to
break
and

faulty
contact
or
check
fuse
for

faulty
contact

Measure

specific
gravity
of
elec

trolyte

Voltage
between
head

lamp
red

white
cable
and

red
cable
ter

minals
is
12
8V
or

higher

Voltage
is

less
than
12

8V

through
above
test

Method
of

inspection

Check

the
fuse
for

fusing
and

faulty
contact

BE
13
Conduct

continuity

test
and
if
the
dirn

mer
switch
is

defec

tive

replace

Repair
or

replace
if

required

Charge

battery
if

required

Replace
battery

Replace
sealed

beam

units

Check
the

generator

regulator
and

light

circuit

Repair
as

required

Replace
lamp

Corrective

action

When
the
fuse
is

fused
detect
and

repair
the
cause
and

replace
the

fuse

BODY
ELECTRICAL

Improper
cable
contact

Oil

pressure
and

ignition
warning
lamps

Condition

Oil

pressure
Want

ing
lamp

The

lamp
does
not

ligh
t
when
the

ignition
switch
is

set

to
ON
Probable

cause

Blown
off

fuse
or

faulty
contact

Broken

lamp
bulb
fIlarnent
or

faulty
cable
contact

Defective
oil

pressure
switch

The

lamp
does
not
Oil

pressure
is

too
low

go
out
while
the

engine
is

being

operated
Lack
of

engine
oil

Defective
oil

pressure
switch

Ignition
warning

lamp

The

lamp
does

not

light
when

the

ignition

switch
is
set
to

ON
Blown
off
fuse
or

faulty
contact

Burnt
out

light
bulb
filarnent
or

faulty
cable
contact
The
fuel
rneter
indicates
a

level

slightly
lower
than

the
actual

level

Method
of

inspection

Check
the

fuse
for

fusing
and

faulty
contact

The

warning
lamp
does
not

light

when
oil

pressure
switch

yellow

black
cable
is

grounded

The

warning
lamp
lights
through

the

above

inspection

Inspect
the

engine
oil

pressure

system

Check
oil
level

Continuity
exists
on
the
oil

pres

sure
switch
when
the

engine
is

being
operated

Check
the
fuse
for

fusing
and

faulty
contact

The

pilot

lamp
does
not

light

when
the

voltage
regulator
con

nector
is
disconnected
the

white
red
cable
is

grounded
and

the

ignition
switch
is
set
to
ON

BE
25
Check
the
cable

from

the

fuel
meter
to
the

tank
unit
for

cable

being
about
to
break

poor
contact
and

faulty
grounding
and

repair
as
required

Corrective

action

Replace
after
corree

ting
the

fuse
the

cause
if
fused

Check
the

light
bulb

for
burnt
out
fIla

ment
and

replace
as

required

Replace
the
oil

pres

sure
switch

Add
oil

Replace
the
oil

pres

sure
switch

Repair
or

replace
as

required

Check
the
bulb
for

burnt
out
fIlament

and

replace
as
re

quired

BODY

ELECTRICAL

Distributor
Secure

ground
of

ignition
coil

Secure
contact
of

carbon
electric

pole
and

rotor

Eliminate
excessive

tip
on
the

rotor

pole
or

cap
pole
by
scrubbing
with

a
screwdriver

Check

stagger
between

rotor
and

stator

Charging

system

Sound
of

alternating
current

pre

sents
Alternator
Install
a
0
5

l
F

capacitor

on

charging
terminal
A

Note
Do
not
use

capacitor
ex

cessively

If

capacity
is
used
ex

cessively
the
alternator
coil

will
be
broken

When

the
accelerator

pedal
is
de

pressed
or
released
noise

presents
Regulator
Install
a
0
5
l
F

capacitor
on
A

terrninal
of
the

voltage
regulator

Supplement
equipment

When

engine
starts
noise

presents

Noise

still

presents
even
after

stopping
the

engine
Operative
noise

of
ther

rnometer
and
fuel

gauge
Install
0
1
l

F

capacitor
between

terminal
and

ground
wire

Note
If

a

capacitor
having
ex

cessive

capacity
is
used
indi

cation
of
meter
will
be
devi

ated

Noise

presents
when
horn
is
blown

Horn
Install
a
0
5

IF

capacitor
on
the

horn

relay
terminal
or
horn

switch

Noise

presents
when
turn

signal

lamps
are

operated
Flasher
unit
Install
a
0

5
l
F

capacitor

Note
a
Be

sure
to
locate

capacitor
most
near

position

of
noise

source
and

connect
in

parallel
completely

d
Make

installation
and

conneCtion

securely

b

Cut
lead

wire
as
short
as

possible

c
Ground
wire
should
be

placed
on
the

body
e

Carefully
identify

marks
IN
or
OUT

BE
33

EMISSION
CONTROL
AND
TUNE
UP

EMISSION
CONTROL
SYSTEM

AN
D

ENGINE
TUNE
UP

CONTENTS

BASIC
MECHANICAL
SYSTEM
ET

Checking
and

adjusting
dash

pot

Adjusting
intake
and
exhaust
valve
automatic
transmission
model

only
ET
9

clearances
ET
1

Checking
carburetor
return

spring
ET
9

Checking
and

adjustin9
drive
belt
ET
2

Checking
choke
mechanism
choke
valve

Retightening
cylinder
head
bolts
manifold
and

linkagel
ET
9

nuts
and
carburetor

securing
nuts
ET
2

Checking
anti

dieseling
solenoid
ET
9

Checking
engine
oil
ET
2

Replacing
fuel
filter
ET
10

Replacing
oil
filter
ET
3

Checking
fuel
lines
hoses

pipings

Changing
engine
coolant
L
L
C
ET
3
connections
etc
ET10

Checking
cooling
system
hoses
and
THROTTLE
OPENER

CONTROL
SYSTEM

ET
10

connections

ET
4
Checking
and

adjusting
throttle

opener
ET
13

Checking
vacuum

fittings
hoses
and
TRANSMISSION
CONTROLLED
VACUUM

connections

ET
4
ADVANCE
SYSTEM

ET
17

Checking
engine
compression
ET
4
Checking
electrical
advance
control

system
ET
19

Checking
exhaust
manifold
heat
control
AUTOMATIC
TEMPERATURE
CONTROL
AIR

valve

ET
5
CLEANER
A
T
C
AIR
CLEANER

ET
20

IGNITION
AND
FUEL
SYSTEM

ET
5
Replacing
carburetor
air
cleaner
filter

ET
20

Checking
battery
ET
5
Checking
hot
air
control
valve

ET
20

Checking
and

adjusting
ignition
timing

ET
5
CRANKCASE
EMISSION
CONTROL

Checking
or

replacing
distributor
breaker
SYSTEM

ET
22

point
condenser
and

spark
plugs
ET
6
Checking
or

replacing
PCV
valve

ET
23

Checking
distributor

ignition
wiring
and

Checking
ventilation
hoses

ET
23

ignition
coil

ET
7
EVAPORATIVE
EMISSION
CONTROL

Checking
distributor

cap
and
rotor

ET
7
SYSTEM
ET
23

Adjusting
carburetor
id
Ie

rpm
and

Checking
engine
compartment
hose

mixture
ratio

ET

8
connections
and
fuel

vapor
control
valves
ET
23

Checking
fuel
tank

vacuum
relief
valve

operation
ET
24

BASIC
MECHANICAL
SYSTEM
1
Start

engine
and
run
it

until
it
is
heated
to

operating

temperature
or
at
least
more
than
800C

I760F
of

engine
oil

temperature
then

stop
engine
Adjusting
intake
and
exhaust

valve
clearances

Valve
clearance

adjustment
should
be
made
while

engine
is

stationary

To

adjust
proceed
as
follows
2
Rotate
crankshaft
to

bring
No
1

cylinder
in

top
dead

center
on
its

compression
stroke

3

Remove
valve
rocker
cover

to

gain
access
to
valve

ET
1

ENGINE

operating
mechanism

Adjust
valve

clearance
at

following
four

points
while

engine
is
still

hot

G
Exhaust

valve
of
No
1

cylinder

CV
Intake
valve

of
No
1

cylinder

CID
Intake
valve

of
No
2

cylinder

CID
Exhaust
valve
of
No
3

cylinder

Note
Numbers
in

parenthesis
agree
with
those
in

ac

companying
sketch

I

Fig
BY

1

Adjusting
valve
clearance

4

Again
rotate

crankshaft
one
turn
so
that
No
4

piston

is
in

top
dead
ce
lter
on
its

compression
stroke

Adjust

follnwing
valves

@
Exhaust
valve
of
No
2

cylinder

@
Intake

valve
of
No
3

cylinder

f
Intake
valve

of
No
4

cylinder

@
Exhaust
valve

of
No
4

cylinder

Adjustment
should
be

made
while

engine
is
hot
After

all

valves
have

been

adjusted
correctly
tighten
lock
nut

firmly
to

secure
the

adjustment

Vah
e
clearance

Hot
Intake

0
35

mm
0
014
in

Exhaust
Checking
and

adjusting
drive

belt

II

I

Fig
ET
2

Adjusting
drive
belt

tension

I

Check
for
a

cracked
or

damaged
V

belt

Replace
if

defective

2

Adjust
the
belt
tension
if

necessary

Belt
deflection
when

thumb

pressure
of
10

kg
22
0
lb

is

applied
midway
between

pulleys
10
to
15
mm

0
394

to
0
590
in

Retightening
cylinder
head
bolts

manifold
nuts

and
carburetor

securing

nuts

Cylinder
head
bolts

When
the

engine
is
in

cold

tightening
should
be
made

in

several

steps
and
in

sequence
shown
in

Figure
EM
82

page
EM
31

starting
with
the
center

toward
the

ends

Tightening
torque

1st
turn

2nd
turn
4

0
to
4
5

kg
m
29
to
33

ft
lb

5
5

to
6
0

kg
m

40
to
43
ft
lb

Then
warm

up
the

engine
and

retighten
the
bolts
to
the

specification
of
hot
condition

Tightening
torque
hot

6
0

to
6
5

kg
m
43

to
47
ft
lb

Other

tightening
torque

Manifold
nuts
0
9
to
14

kg
m
6
5
to
10
ft
lb

Carburetor
nuts
0
5

to
LO

kg
m
3

6
to
7
2
ft
lb

Checking
engine
oil

Oil

capacity
of

engine
including
oil
filter

ET
2