1979 DATSUN 210 engine

throttle

opener
solenoid
valve

The
throttle

opener
solenoid
valve

is

actuated
and
the

servo
diaphragm

chamber
is

opened
to
the

atmosphere

In
this
case

the
seIVo

diaphragm

does

not

opera
te
Engine
Fuel

Automatic
transmission
models

As

long
as
the

shift
lever
is
in
the

N

or
p

position
the
inhibitor

switch
on
the
transmission
is
turned

on
and
the

throttle

opener
solenoid

valve
is

actuated
Under
this
condition
the
seIVo

diaphragm
does
not

operate

because
of

the
same
reason
as
men

tioned
for
the

manual

transmission

model

ON
Car

peed
betow

t6
km
h

to

mph

OFF
Car

peed
above
16
km
h

to
mph

To
intake

manifold

j

lJl
11
1

ti

i
ljn

L

o

1

Servo

diaphragm

2

Vacuum
control
valve

3
Altitude

corrector

4
Throttle

opener
solenoid
valve

5

Inhibitor
switch
N
p

ON
for
automatic

transmission

6

Speed
detecting
switch
below

10
MPH

ON
for
manual

transmission

7

Amplifier

8

Ignition
switch

9

Primary
throttle
valve
Note

FUEL

SHUT
OFF
SYSTEM

The

fuel
shut
off

system
is

to
shut

off

the
fuel

during
deceleration

there

by

reducing
fuel

consumption
This

system
also

helps
prevent
a

tempera

ture
rise
in
the

catalytic
converter

during
long
periods
of

deceleration

The

major
parts
of
the

system
are

an
anti

dieseling
solenoid
a
neutral

detecting
switch
a

throttle
valve

switch
and

an

engine
revolution

switch
e

1

l
6

I

I

I

I

I
I

I
I

I

l

L
I

Broken
tine

applies
only
to
Automatic

Transmission
7

Anti
dieseling
solenoid

Electric
current

OFF
ON
valve

I

I

h

L

Battery

I

Neutral

detecting
switch

l

2

Throttle

valve
switch

3

Engine
revolution
switch

4

Transistor

ignition
unit
o

Ignition
switch
EF105A

Fig
EF
26
Throttle

Opener
System

ill

Ignition
coil

U
EF846

Fig
EF

27
Anti
dieseling

Solenoid
Valve

EF
11

Fuel
shut
oH

s
stein

operation

During
deceleration
when

the
en

gine

speed
is

above
a
certain
level
the

anti
dieseling
solenoid
valve
of
the

carburetor
closes
so
that
the
fuel
is

shut
off
When

engine
speed
falls

below

a
certain
level
the
anti

dieseling

solenoid
vaJv

oP
lS
so
that

the

f
el

flows
However

if
the

engine
speed
is

below
the

designated
level

even

during

deceleration
the
fuel

shut
off

system

does
not

operate
When
the
shift
lever

is
in
neutral

the
fuel

shut
off

system

does
not

operate

The

functions
of
each

part
of
this

system
are
as
follows

I

Engine
revolution
switch

The

engine
revolution

switch
turns

off
when

the

engine
revolution
is

above
2

100

rpm
and
turns

on
when

the

engine
revolution
falls
below
1

650

rpm
This
switch
is

actuated

hy
a

pulse

of

the

ignition
system

This
switch
is

located
on
the

right

hand

dash
side

panel
in
the

passenger

compartment
as
shown
in
the
follow

ing
figure
Engine
Fuel

I

Fig
EF
28
Location

of

Engine

Revolution
Switch

2

Neutral

detecting
switch

The
neutral

detecting
switch
turns

on
in

neutral
and
turns
off
in

other

shift

lever

positions

h

1

Neutral

detecting
switch

2

Revenelamp
switch

3

Top

detectim
switch
EC275
3
Throttle
valve

switch

The

throttle
valve

switch
is

installed

on

the
carburetor
It

turns
off
when

the

throttle
valve
is
closed

and
turns

on
when
the
throttle

valve
is

open

The

opening
position
of
the

throt

tle
valve

switch
is
calibrated
in

engine

rpm
when
the

engine
is
revved

up

under

no
load

The

switch
turns
on
when

the

engine
revolution
is

above
1

150

rpm

and

turns
off
when
the

engine
revolu

tion
is

below
1

000

rpm

1
Micro
switch

2

Connector

3

Adjusting
screw

EF848

Fig
EF
30
Location

of
Throttle

Valve
Switch

Fuel
shut
off
Anti

dieseling

Engine
revolution
Throttle
valve

opening
Shift
lever

position

system
solenoid
valve

Activated

Closed

Except
neutral
OFF

Closed
OFF

Neutral

ON

High
OFF

Except
neutral
OFF

Open
ON

Inactivated

Open
Neutral
ON

Closed
OFF
Excep
t
neutral
O
F

Low
ON
Neutral
ON

Except
neutral
OFF

Open
ON

Neutral
ON

Continuity
of
switch
Fig
EF
29
Locotion

of
Neutral

Detecting
Switch

EF
12

ELECTRIC
AUTOMATIC

CHOKE

An
electric
heater
warms
a
bi
metal

interconnected
to
the
choke
valve
and

controls
the

position
of
c
oke

valve

and
throttle
valve
in
accordance

with

the

time

elapsed
the
warm

up
condi

tion
of
the

engine
and
the
outside

ambient

temperature

Electric
heater

The
electric

heater
is
made

up
of

a

semiconductor
and

installed
in

the

automatic
choke
cover
in

the

body

2
Bi
metal

Electric
current

flows

through
the

heater

as
the

engine
starts
and
warms

the
bi
metal
The

deflection
of
the

bi

metal
is

transmitted
to
the
choke

valve

through
the

choke
valve
lever

3

Fast
idle
cam

The

fast
idle

cam
determines
the

opening
of
the

throttle
valve

SQ
that

the

proper
amount

of
mixture

cor

responding
to
the

opening
of
the

choke
valve
will
be

obtained
The

opening
of
the

choke
valve
is
de

pendent

upon
the
warm

up
condition

of

the

engine

4
Choke
unloader

When

accelerating
the

engine
during

the

warm

up
period
that
is

before
the

choke
valve

opens
sufficiently
this

unloader
forces
the

choke
valve

open
a

little

so
as
to
obtain
an

adequate

air
fuel
mixture

S

Vacuum
break

diaphragm

After
the

engine
has
been
started

by
cranking
this

diaphragm
forces
the

choke
valve

open
to
the

predetermined

extent
so
as
to

provide
the

proper

air
fuel
ratio

A
two

stage
acting
type
vacuum

diaphragm
is

employed

6
Si
metal

case
index
mark

The
bi
metal
case
index
mark
is

used
for

selling
the
moment
of
the

bi
metal
which
controls
the
air

fuel

mixture
ratio

required
for

starting
Engine
Fuel

r
m

2

3

4

5

6
r
3

1

@
@
Alternator
L

terminal

Automatic

choke

relay

Automatic
choke

cover

P
T
C
heater

Bi

metaJ

spring

Choke
valve

Fig
EF
31
Electric
Automatic
Choke

l
eater
EF045A

l

A

Higher
ambient
temperature

Manifold

vacuum
Clearance
B

B
Lower
ambient

temperature
Clearance

Manifold

vacuum
1
Hi
metal

2
P
T
e
heater

3
Thermostat
cover

4
Vacuum

diaphragm

5
Fast
idle

earn

6
Bi
metal
cover

index
mark

7
Choke
shaft
lever

8
Choke
valve

9
Unloader

tang

10
Throttle
valve

11
Fast

idle

adjusting
screw

EF243

t

Diaphragm

2

Spring
I

3

Spring
11

4
Rod

5
Choke
valve

6
Plate

@
7
Bi
metal

EF884

Fig
EF

32
Electric
Automatic
Choke

EF

13

DASH
POT
SYSTEM

These

carburetors
are

equipped

with
a
dash

pot
interlocked
with
the

primary
thrott
Ie
valve

through
a

link

mechanism

The
dash

pot
prevents
the

throttle

valve

from

closing
abruptly
thereby

reducing
He
emissions

during
deceleia

tion
or

gear
shifting

In
automatic

transmissi9fi
models

it

also

prevents
engine
stall

resulting

from

quick
application
of
the
brake
or

from

quick
release
of
the

accelerator

pedal
after
it
s
been
tread

upon

slightly

INSPECTION

AND

ADJUSTMENT

CARBURETOR
IDLE
R
P
M

AND
MIXTURE
RATIO

CO
idle
adjustment
with

CO
meter

Refer
to
Carburetor
Idle

rpm
and

Mixture
Ratio
Section
ET
for
check

ing
and
a

justment

CO
idle

adjustment
without

CO
meter

Non
California
models

Refer
to

Carburetor
Idle

rpm
and

Mixture
Ratio
Section

ETl
fot
check

ing
and

adjustment

Idle

limiter

cap

Refer
to
Idle

Limiter

Cap

SeCtio

ET
for

checking
and

adjustment

FUEL

LEVEL

I

With

engine
idling

visually
check

fuel
level

through
sight
window
of

float
chamber

Fuel
level
is
correct

if
it

is
at
the

indicator

point

Note

Fuel
level
indicator

point
is

located
IS
mm
0
59
in
below

top

of
carburetor

body
H

as
shown
in

Figure
below
Engine
Fuel

EF088A

Fig
EF
33

Checking
Fuel
Level

To

adjust
fuel
level

proceed
as

follows

2

Remove
choke

chamber

3

Turn
down

choke
chamber

to

allow

float
to

come
into
contact
with

needle

valve
and

measure
H

shown

below

When
H

is

approximately
15
mm

0
59
in

top
float

position
is
correct

The

top
float

position
can
be
ad

justed
by
bending
float
seat

Upon

completion
of
the

adjust

ment

check
fuel

level
with

attached

level

gauge

nhH

J

1
Float

2
Float

stopper
3
Float

seat

4
Needle
valve

Fig
EF
34

Adjusting
Floot
Level

EF

14
4

Adjust
bottom
float

position
so

that
clearance

hl
between

float

seat

and
needle

valve
stem
is
1
3
to
I
7
mm

0
051
to
0
067
in
when

float
is

fully

raised
Bend
float

stopper
as

required

5

Install
choke
chamber

6
After

adjustments
in

steps
3
and

4
above
have
been

made
make

sure

that
when
fuel
is
delivered
to
the

float

chamber
the

fuel
level

is
maintained

within
the

specified
value

H

FAST

IDLE

I
Remove
carburetor

assembly

from

engine

2
Remove

bi
metal
cover

3

Place
fast
idle
arm
on
second

step

of
first
idle
cam
Then

adjust
fast
idle

adjusting
screw
as
shown
at
A
in

illustration

The
clearance
A

should
be

specified
value
in
the

following
table

4

To
check
fast
idle
cam

setting
by

engine
speed
proceed
as
follows

Warm

up
engine
sufficiently
Set

fast
idle

cam
at
2nd

step
and
read

engine

speed

Fast
idle
cam
is

properly
set
if

engine
speed
is
within

above

specifica

Hons

VACUUM
BREAK

I
Close
choke

valve
completely

2
Hold
choke
valve

by
stretching

rubber
band
between
choke
shaft
lever

and

stationary

part
of

carburetor

3
Push
vacuum
break

stem
with

plie
and

puD
fully
straight

4
Under

this
condition

adjust
gap

shown
at
8
in

illustration
between

choke

valve
and
carburetor

body

Clearance
Bu

All
model

except
FU
model

1
80
to
1
98
mm

0
0709
to

0
0780
in

FU

model

1

98
to
2
16
mm

0
0780
to
0
0850

in
Engine
Fuel

Clearance
A

mm
in
Engine
speed

rpm

Manual
transmission
0
73

to
0
87

0
0287
to

0
0343

1

00
to
1
14

0
0394
to

0
0449
2

400
to
3
200
1
900
to
2

700

Automatic

transmission

Fast

idle
earn

steps

g
g
2
5
t

to
J

A
ti

Ogc
j
jdle
adjusting
screw

o

0

II
r

Throttle

chamber

EF098A

Fiil
EF
35

Adjusting
Fast
Idle

@
B

@

cv

Push

I

4

Choke
valve

5

Vacuum
break
stem

EF885
1
Rubber
band

2

Vacuum
break

stem

3
Vacuum
break
rod

E
F099A

Fig
EF
36

Adjwtirig
Vacuum
Break

EF
15

CHOKEUNLOADER

I
Close
choke
valve

completely

2

Hold
choke

valve

by
stretching
a

rubber

band
between
choke
shaft
lever

and

stationary
part
of

carllUretor

3
Pull

throttle
lever
until
it

com

pletely
opens

4
Under
this
condition

adjust
clear

ance
e
See
illustration
between

choke
valve
and
carburetor

body
by

bending
unloader

tongue
See

Fig

EF
37

Clearance
C

All

modelS
ex

pt
F
U
model

2
36

mm
0
0929

in

FU
model

2
17

mm
0
0854
in

Note
Make

sure
that
throttle
valve

opensfuDy
when
carburetor
is

mounted

on
car

If
throttle
valve
fails
to

open
fully

unloader
becomes

inoperative
re

suiting
in

poor
acceleration
after

engine
is
started

AUTOMATIC

CHOKE

HEATE
IRCUIT

Checking
heater

circuit
with

function

connector

CAUTION

00

not
attach

test
leads
of
8
circuit

tester
to
those
other
than

designated

I

With

engine
not

running
check

for

continuity
between
A
and

B

If

continuity
exists
heater
is

fune

tioning
properly

If

continuity
does
not
exist

check

for
discon
nected

connector
or

open

P
T
C

heater
circuit

2

With

engine
running
at

idle
check

for

presence
of

voltage
across
A

and
B

If
voltmeter

reading
is
12
volts

heater
circuit
is

functioning
proper

ly

If
voltmeter

reading
is
zero

check

for
disconnected
connector

open

circuit
or

faulty
automatic

choke

relay

3

Replace
faulty

parts
Engine
Fuel

c

i

CD

1
Rubber
band

2
Unloa
er

tongue

3
Choke
vaJve

f
rC
EC150

Fig
EF

37

Adjusting
Choke
Unloader

SJ

v

1

Ignition
switch

2
Automatic
choke

relay

Engine
stop
ON

Engine
start
OFF
3
Automatic
choke
heater

4
Function
test
connector

5
L
terminal
of
alternator

EF

16
Fig
EF

38
EF433A

Checking
Automatic
Choke
Heater
Circuit

with
Function
Teat
Connector

AUTOMATIC
CHOKE

MECHANISM

I
Before

starting
engine
fully
de

press
accelerator

pedal
to
ensure
that

choke

valve
closes

properly

2
Push

choke
valve
wi
th
a

finger

and

check
for

binding

3

Check
to
be

sure
that
bi

metal

cover
index
mark
is
set
at
the
center
of

choke

housing
index
mark

as
shown

below
I

Note
Do

not
set
b

metal
cover
index

mark

at

any
position
except
the

center
of
choke

housing
index

mark

CD
@

Thermosta

t
covel

Bi
metal
chamber

2
Thermostat

housing

3

Groove
E
T034

Fig
EF
39
Bi
metal

Setting

4

Check
automatic
choke
heater

source

wiring
for

proper
connection

then

start

engine

S
After

warming
up
the

engine
see

that
choke
valve
is

fully
open

6
If
automatic

choke
heater
source

wiring
is
normal
and
choke
valve
does

not

operate
after

warm

up
replace

bi

metal
cover

AUTOMATIC
CHOKE
RELAY

The
automatic
choke

relay
is

local

ed
in
the

relay
box

I
Remove
automatic
choke

relay

by

removing
two

securing
screws
Engine
Fuel

II

EF422A

Fig
EF
40
Location

of
Automatic

Choke

Relay

2
Check
the

continuity
of
the

relay

as
follows

In
normal

condition

continuity
be

tween

CV
and

@
should
exist

Then

apply
l2V

battery
voltage

across

CID
and

@
Under
this
condi

tion
contin

ity
between

CV
and

@

should

disappear

If

not
the

relay
is

faulty
replace
it

W
hWO

CID
CD

CV
o
0

@

Q
I

o
r
@

CID

@

EF989

Fig
EF

41
Checking
Automatic

Choke

Relay

AUTOMATIC
CHOKE

HEATER

I

Measure
resistance

of
choke

heater

Specified
resistance
is

3
7

to
8
9

ohms

EF
17
EF855

Fig
EF
42

Checking
Automatic

Choke
Heater

2
If

measured

value
is
not
within

the

specification
replace
bi
metal

cover

INTERLOCK
OPENING
OF

PRIMARY
AND
SECONDARY

THROTTLE
VALVES

1

Open
primary
side
throttle
valve

480
from

fully
closed

position
and

measure
clearance
G
1
between

throttle
valve
and

throttle
chamber

inside
wall
as
shown

in

Fig
EF
43

Clearance
6G1

5
83
mm
0
230
in

@

J
3

480

r
mit
GI

6

1

Connecting
rod

2

Secondary

connecting

lever

3
Throttle
lever

4

Secondary
throttle

valve

5

Primary
throttle
valve

6
Throttle
chamber

Fig
EF
43

Adjusting
Interlock

Opening
Primary
and

lecondary
throttle

values

2

Without

disturbing
above

setting

bend

connecting
rod

as
necessary
so

that
secondary
throttle
valve
is
about

to

open
E

F089A

Engine
Fuel

Upon
completion
of

adjustment

make
sure
that

link

system
opera
tes

smoothly
It
is

necessary
to
remove
Carburetor

from

engine
in

adjusting
this
accelera

tor

pump
stroke
limiter

1

Remove
carburetor

from

engine

2

Insert
a
l
l

to
I
S
mm
0

043
to

0
059

in
feeler

gauge
a

piece
of

round

stock
of

proper
thickness
is

best

betwee
l
primary
ca

buretor

throat
and
throtile
valve
ACCELERATOR
PUMP

STROKE

LIMITER

In

rmal
service

operation
this

limiter
should

not
be
removed
or

bent

In
J

0

ID

@

l

1IJl

J
J
00

I
f

oj

G
1
3
IO
2

mm
0
051
IO
004
in

Fig
EF
44
AdjlUting
Acce
rator

Pump
Stroke
Limiter
1
Primary
carburetor
throat

2
Throttle
valve

3
Lever

4

Limiter
5
Piston

6

Pin

7
Feeler

gauge

E
F048A

3

With
throttle
valve
held

open

properly
by
feeler

gauge
check

that

lever

barely
contacts

pin
If
lever
and

pin
are
not
in

contact

bend
limiter
until

proper
contact
is

made

OZ
00
A

fID

1

S

@

4
1

Full

travel
of

lever

f

EF049A
A
1
Lever

2
Correct

contact
area

3
Limiter

4
Pin

5

Pistgn
6
Correct
cont
ct
area

7
Lever

8

Limiter

9
Pin

10
Piston

Fig
EF
45
Stroke
Limiter

DASH

POT

I

Idling
speed
of

engine
and
mix

ture
must

be
well

tuned

up
and

engine

sufficiently
warm

2
Turn
throttle
valve

by
hand
and
read

engine
speed
when
dash

pot
just

toucnes

stopper
lever

3

Adjust
position
of
dash

pot
by

tuming
nut
until

engine
speed
is

in
the

specified

range

California

models
Non

Califomia

models

Automatic

transmission
1

900

to
2

100
1
900
to

2
100

Manual
transmission

1
900

tp
2

100
2
300

to
2

500

FU
model

1

900
to
2

100

EF

t8
1
Lock
nut

2
Dash

pot

E

F730

F
ig
EF
4

Ll
dj

ting
h

P
ot

4

Tighten
lock
nuts

5

Make
sure
that

engine
speed

drops
smoothly
from
2

000

to
1
000

rpm
in

about
three

seconds

ACCELERATING
PUMP

I

Visually
inspect

accelerating

pump
cover

for

any

sign
of
fuel

leaks

2

If
fuel

leaks
are
found

check

gasket
and

replace
if

necessary

3

Turn
throttle

valve

by
hand

make
sure
fuel
is

injected

through

injector
nozzle

Note
To

check
or

fuel

injection

peep
into
nozzle
rom

upper
side

while

directing
flashlight
beam
to

ward

primary
barrel

ANTI
DIESELING

SOLENOID

VALVI

Start
the

engine
and

keep
at

idling

speed
Disconnect
the

lead
w

e
for
the

anti
dieseling

solenoid
at
the

connec

tor

If
the

engine
does

not

stop
when

the
lead

wire
is

disconnected
the

solenoid
is

stuck
Reconnect
the
lead

wire
and

start
the

engine
Then
turn

off
the

ignition
switch

If
the

engine
does
not

stop
when

the

ignition
switch
is
turned
off

this

indicates
that
the

striking
solenoid

valve
is

stuck
or

short

circuited

If
the

harness
i
in

good
condition

replace
the
solenoid
valve
as
a
unit