1979 DATSUN 210 fuel

Emission
Control

System

r

@
@
CD

L

I

1
Air

pump
drive
hub

5
V
ne

2

Housing
6
Carbon
shoe

3
Rotor

rins
7
Shoe

spri
ng

4

End
cover
8

Stripper

with
needle

bearing
9
Rotor
shaft

Anti
backfire
A
B
valve

This
valve
is
actuated

by
intake

manifold
vacuum
to

prevent
backfire

in
the

exhaust

system
at
the

initial

period
of
deceleration

At

this

period
the
mixture
in
the

intake
manifold

becomes
too
rich
to

ignite
and
burn
in

the
combustion

chamber
and

burns

easily
in

the
ex

haust

system
with

injected
air

in
the

exhaust
manifold

The
A

B
valve

provides
air
to
the

intake
manifold
to

make
the
air

fuel

mixture

leaner
and

prevents
backfire

To
in
take

manifold

vacuum

EC069

Fig
EC

15
A
B
Valve
10
Ball

bearing

11
Front

bearing
cOYer

12

Pulley

13

Pulley

for
air
conditioner

Check
valve

A

check
valve
is

located
in
the

air

pump
discharge
lines
The
valve

pre

vents
the

backflow
of
exhaust

gas

which
occurs
in

the

following
cases

I

When
the
air

pump
drive
belt

fails

2
When

relief
valve

spring
fails

1

11
rom

pump

1

Spring

2
Rubber
valve

3

Seat
SecondarY
air

4
J
Exhaust

gas

EC322

Fig
EC

16
Check
Valve

Air

gallery

The

secondary
air

fed
from
the
air

pump
goes

through
the
check
valve
to

the

air

gallery
in
the

cylinder
head
It

EC
lt
14
Inlet

cavity

15

Outlet
cavity

EC066A

Fig
EC
14
Air

Pump
two
vane

lype

is
then

distributed
to

each
exhaust

port
and

injected
near
the

exhaust

valve

0

iJl

Ai

gallery

2

Exhaust

port

3
Exhaust

manifold

EC316

Fig
EC

17
Air

Gallery

Air
pump
relief
valve

Non
California

models

The
air

pump
relief

valve
controls

the

injection
of

secondary
air
into

the

exhaust

system
when
the

engine
is

running
at

high
speed
under
a

heavily

loaded

condition
It

accomplishes
the

Air
Induction
v
lve
filter

The
air
induction
valve
filter
is

installed
at
the
dust
side
of
the
air

cleaner
It

purifies
secondary
air

to
be

sent
to
the

exhaust
tube
The
fIlter

element
should
be

replaced
periodical

ly
in
accordance
with
the
Maintenance

Schedule

EC921

Fig
EC
54
Air
Induction
Valve

Filter

Antl
beckflre
v
lve
A
B
v
lve

Tltis
valve
is

controlled

by
intake

manifold
vacuum
to

prevent
backfire

in
the

exhaust
system
at
the
initial

period
of
deceleration

At
this

period
the
mixture
in

the

intake
manifold
becomes
too
rich
to

ignite
and
burn
in

the
combustion

chamber
and
burns

easily
in
the
ex

haust

system
with

injected
air
in
the

exhaust
manifold

The
anti

backfire
valve

provides
air

to
the
intake

manifold
to
make
the

air
fuel
mixture
leaner
and

prevents

backfire

If

the
valve
does
not
work

properly

unburned
ntixture
will
be

emitted

from

the
combustion
chambers
and

burns
with
the
aid
of

high
temperature

and

injected
air
which

causes
backfrre

To
intake

manifold

vacuum

To
intake

manifold

From
air

cleaner

EC069

Fig
EC
55
Anti

backfire
Value
Emission
Control

System

Air
Induction
Into
exhaust

port

The

secondary
air
fed
from
the
air

induction
valve

goes
through
the
check

valve
to
the
air

gallery
in

the

cylinder

head
It
is
then

distributed
to

each

exhaust

port
and

injected
near
the

exhaust
valve

I
Air

gallery

2
Exhaust

port

3
Exhaust
manifold

EC316

Fig
EC
56
Sectional
View

of

Exhaust
Port

REMOVAL
AND

INSTALLATION

Air
Induction
valve
and
filter

Remove
the
screws

securing
the

valve
and
filter
to
the
air

cleaner
body

The
air
induction
valve
and
valve
filter

can
then
be
taken

out

easily
Installa

tion
is
in
the
reverse

sequence
of

removal

EC922

Fig
EC
57

Removing
Air
Induction

Valve
and
Filter

EC
19
Air
Induction

pipe

Loosen
out
a

nut
securing
the

pipe

to

the

engine
cylinder
head
At
the

same
time
remove
the
screws

securing

the
bracket
and
rubber
hose

clamp

The
air
induction

pipe
can
then
be

taken
out
Installation
is
in
the
reverse

sequence
of
removal

Fig
EC
58

A
B
valve

The
A
B
valve
is
located
at
the

rear

side
of
the
air
cleaner
Remove

the
air

hoses
and
vacuum
tube

The
A
B
valve

can
then
be

taken

out
Installation
is
in
the

reverse
se

quence
of
removal

EC152A

Fig
EC
59

Removing
A
B
Valve

INSPECTION

Preliminary
Inspection

Check
hose
for
looseness

flatting

damage
or

faulty
connections
and

each

part
for

proper
installation
If

necessary

replace

Air
Induction
valve
and
filter

I
Disconnect
air
induction
hose
at

air
induction

pipe
side
Suck
or
blow

hose
to
make
sure
that
air

flows

only

on
the
air

induction

pipe
side

Emission
Control

System

EvApORATIVE

EMISSION
CONTROL
SYSTEM

DESCRIPTION
carbons
is

accomplished
by
activated

charcoals
in

the

C
Ibon
canister

This

system
is
made

up
of
the

foUo

ing
I

I
Fuel
tank
with

positive
sealing

filler

cap
The

evaporative
emission

control

system
is

used
to
reduce

hydrocarbons

emitted
to
the

atmosphere
from
the

fuel

system
This
reduction
of

hydro

6
C

2
Fuel
check
valve

3

Vapor
vent
line

4

Carbon
canister

I

5

Vacuum

ignalline

6

Canister

purge
line

5

1
Fuel
tank

2
Fuel
filler

cap
with

vacuum

relief
valve

3
Fuel
check
valve

4

Vapor
vent
line

5
Canister

purge
line

6
Vacuum

signal
line

7
Carbon
canister

EC327
A

Fig
EC
104

Evaporative
Emission
Control

System
for

Sed
n

EC
35
t

OPERATION

Fuel

vapors
from

the
sealed
fuel

tank
are
led
into
the
carbon
canister

The
canister

is
filled
with
activated

charcoals
to
absorb
the
fuel

vapors

when
the

engine
is

at
rest
or
at

idling

t

Fuel
tank

2

Fuel
filler

cap
with

vacuum

re1ief
va1ve

3
Fuel
check
vslve

4

Vapor
t
line

5
Vacuum

signal
line

6
Canister

purge
line
Emission
Control

System

As

the
throttle
Valve

opens
and
car

speed
increases
vacuum

pressure
in

the
vacuum

signajline
forces
the

purge

control

valve
to

open
and
admits
an

orifice
to

intake
manifold
and
fuel

vapor
is

then
drawn
into
the
intake

manifold

through
the
canister

purge

line

Fuel
vapor

7
Throttle
valve
IZ
Filter

8

Engine
13

Purge
control
valve

9
Carbon

cani5t
14

DiaphraP
spring

10
Activated
carbon
IS

Diaphngm

II
Screen
16
Fixed
orifice

EC785

Fig
EC
JOS

Evaporative
Emiuion
Control

System

Fuel

vapor
flow
when
ngine
is
at
rest
or

running

REMOVAL

AND

INSTALLAtiON

CARBON
CANISTER
FILTER

Check
for
a

contantinated

element

Elemenl
can
be
removed
at
the

bottom
of
canister

installed
on

car

body

EF201

Fig
EC
I06

Replacing
Carbon

Canilttr
Filter
CHECK
VALVE

The
check
valve
is

located
behind
the

luggage
compartment
board
on
the

fuel
tank

Remove

the

luggage

compartment

board
and
disconnect

the

vapor
tube

The
check

valve
can
then
be

taken

out

EC315A

Fig
EC
I07

Removing
Check

Volve

EC
36
INSPECTION

FUEL
TANK

AND

VAPOR
VENT
LINE

1

Check
all
hoses
and
fuel
tank

filler

cap

2

Disconnect
the

vapor
vent
line

connecting
carbon
canister
to

check

valve

3
Connect
a
3
w

y
connector

a

manometer
and
a

cock
or
an

equi

valent
3

way
charge
cock
to
the
end

of
the
vent
line

EC183A

Fig
EC
IOB

Vent
Line

4

Supply
fresh
air
into
the

vapor

vent
line

through
the
cock
little

by

little
until

pressure
becomes
368

mmHZO
14
5

inHZO

S
Shut
the
cock

completely
and

leave
it

unattended

6
After
2
5
minutes
measure
the

height
of
the

liquid
in

the
manometer

7

Variation
in

height
should
remain

with
25

mmHZO
0
98

inH20

8
When
filler

cap
does
not
close

completely
the

height
should

drop
to

zero
in

a
short
time

9
If
the

height
does
not

drop
to

zero
in

a
short
time
when
ruler

cap
is

d
it
is

the
cause
of

a

stuffy

hose

Note

In
case
the
vent
line
is

stuffy

the

breathing
in
fuel
tank
is
not

thoroughly
IIIIIde
thus

causing
in

sufficient

delivery
of
feul
to

engine

or

vapor
lock
It

must
therefore
be

repaired
or

replaced

3
way
connector

ck

Air

@
Manometer

Carbon
canister
Emission
Control

System

400
mmH20
15
75

inH20

Check
valve

Fuel

filler
cap

r

EC091A

Fig
EC
I09

Checking
Evaporative
Emiuion
Control

Syatem

FUEL
CHECK
VALVE

I
Blow
air

through
connector
on

fuel
tank
side

A

considerable
resistance

should
be

felt
at
the
mouth
and
a

portion
of
air

flow
be
directed
toward
the

engine

2
Blow
air

through
connector
on

engine
side

Air
flow
should
be

smoothly
direct

ed
toward
fuel
tank

3
If
fuel
check
valve

is

suspected
of

not

being

properly
functioning
in

steps

I

and
2
above

replace

Engine
side
Fuel
tank

side

Q

Evaporative
fuel
flow

Fresh
air

flow

EC090A

Fig
EC
110

Checking
Fuel
Check

Valve
CARBON
CANISTER
PURGE

CONTROL
VALVE

Check
for
fuel

vapor
leakage
in
the

distributor

vacuum
line

at

diaphragm

of
carbon
canister

purge
control
valve

To
check
for

leakage

proceed
as

follows

I
Disconnect
rubber
hose
in
the

line
between
T

connector
and
carbon

canister
at
T
connector

2

Inhale
air
into

the

opening
of

rubber
hose

running
to
vacuum
hole
in

carbon
canister

and
ensure
that
there

is

no
leak

ET349

Fig
EC
lll

Checking
Carbon
Canister

Purge
Control
Valve

EC37
3
If
there
is
a
leak
remove

top

cover
from

purge
control
valve
and

check
for
dislocated
or
cracked
dia

phragm
If

necessary
replace
dia

phragrrt
kit
which
is
made

up
of
a

retainer

diaphragm
and

spring

i

ii

1
Cover

2

Diaphragm

3
Retainer

4

Diaphragm
spring

ET350

Fig
EC
112

Carbon
Canister

Purge

Control
Valve

FUEL
TANK
VACUUM

RELIEF
VALVE

Remove
fuel
filler

cap
and
see
it

functions

properly

I

Wipe
clean
valve

housing
and
have

it
in

your
mouth

2
Inhale
air
A

slight
resistance

ac

companied
by
valve
indicates
that

valve
is
in

good
mechanical
condition

Note
also
that

by
further
inhaling
air

the
resistance
should
be

disappeared

with
valve
clicks

3
If
valve
is

clogged
or
if

no
resist

ance
is

felt

replace
cap
as
an
assem

bled
unit

O

ET500

Fig
EC

1l3
Fuel
Filler

Cap

INSPECTION
TABLE

I

No

spark
occur

Check

high
tension
cable

NG
OK

Repair
and

lor
replace
ngine
Electrical

System

START

Check

sparking
performance

J
J
Sparks
oci
1u

IC

IGNITION
SYSTEM
OK

Check
power
supply
circuit

NG

Repair
and
or

replace
OK

Check

primary
circuit
Proceed
to

A

Proceed
to
A
NG

epair
an
or

replace
OK

Proceed
to
A
DISTRIBUTOR
ASSEMBLY
NG

lC
IGNITION
UNIT
AND
OR

PICK
UP

COIL
NG

Mealure

pick
up
coil
resistance

as
a

distributor
assembly

Except
approx
4000

Measure

igilition
coii

8terminalvoltage

Battery
voltage

t
OV

Measure

pick
up
coil
resistance

I
Ie
IGNITION
UNIT
NG

Except
approx
400n

Approx
400n

PICK
UP
COIL
NG

1
PICK

UP
COIL
OK
Replace

IC

IGNITION

Replace

I
UNI
NG

l
Meuure

pick
up
coil
resistance

Except
approx
4000
I

Check

sparking
performance

I
Replace

I

r
PICK
UP
COIL
NG

1

No

spark
occun

Sparks
occur

I
IC
IGNITION

flc
IGNITION
Proceed
to
A

Replace

UNIT
NG

i
UNIT
OK

Proceed
to
A

Replace

Proceed
to
A

CHECKING

PROCEDURE

Sparking
performance

check

L
Turn

ignition
switch
to

OFF

position

2
Disconnect
anti
dieseling
solenoid

valve
connector
to
cut
off

supply
of

fuel
to

engine

3

Disconnect

high
tension
cable

from

spark
plug

4

Keeping
high
tension

cable
end
4

to
5

mm
0

16
to
0
20
in

away
from

engine
block
rotate
starter
motor
and

check
whether
sparks
occur
across
the

clearance
JUDGMENT

Sparks
occur

IC

ignition
system
OK

In

this
case
IC

ignition
system
and

component
parts
need

not
be
checked

beyond
this

No

spark
occurs

IC

ignition
system
NG

In
case
of
NG
check

High
Tension

Cables

Nole

This
check
is

designed
to

deter

mine

only
ignition

spark
perform

ance
when

cranking

engine
If

test

results
are

satisfactory
Ibis
does

EE

26
I

Approx
400n

PICK
UP
COIL
OK

1C
IGNITION

UNIT
NG

I
Repair
and
or

replace

I
Proceed
to
A

Approx
400n

l
PICK
UP

COIL
OK

1

not

alwaY
indicate

performance

sufrlcienl
for

high
speed

operation

IOgh
tension

cable
check

Refer
to

Engine
Tune

up
for
Check

ing
Ignition
Wiring
Distributor

Cap

and
Rotor

JUDGMENT

If

high
tension

cable
is
OK
check

Power

SupplY
Circuit

If

high
tension
cable
is
NG

replace

cable

assembly

INSPECTION

I

Disconnect

high
tension

cables

from

spark
plugs
by
pulling
on

boot

not
on
cable
itself

2

Remove

spark

plugs

3

Check
electrodes
and
inner

and

outer

porcelains
of

plugs
noting
the

type
of

deposits
and
the

degree
of

electrode
erosion

Refer
to

Fig
EE

76

Normal
Brown

to

grayish
Ian
de

posits
and

slighl
electrode
wear

indicate
correct

spark

plug
heat

range

Carbon
fouled

Dry
fluffy
carbon
de

posits
on
the
insulator
and
elec

trode
are

mostly
caused

by
slow

speed
driving
in

city
weak

ignition

too
rich
fuel
mixture

dirty
air

cleaner
etc

H
is
advisable
to

replace
with

plugs

having
hotter
heat

range

Oil
fouled

Wet
black

deposits
show

excessive

oil
entrance
into

comb
us

tion
chamber

through
worn

rings

and

pistons
or
excessive

clearance

between
valve

guides
and
stems
If

the
same
condition
remains
after

repair
use
a
hotter

plug

Overheating
White
or

light
gray
insu

lator
with
black
or

gray
brown

spots
and
bluish
burnt
electrodes

indicate

engine
overheating
More

over
the

appearance
results
from

incorrect

ignition
timing
loose

spark
plugs
low
fuel

pump
pres

sure

wrong
selection
of
fuel

a

hotter

range
plug
etc

H
is
advisable
to

replace
with

plugs

having
colder
heat

range

4
After

cleaning
dress
electrodes

with
a
smaU
fme
file
to
flatten
the

surfaces
of
both

center
and
side
elec

trodes
in

parallel
Set

spark
plug

gap
to

specification

5

Install

spark

plugs
and

torque

each

plug

6
Connect

spark
plug
wires

CLEANING

AND

REGAP

Clean

spark
plugs
in
a
sand
blast
Engine
Electrical

System

SPARK

PLUG

Conventional

type

Normal

Overheating

Multi

gap
type

Nonnal

Overheating

type
cleaner
Avoid
excessive

blasting

Clean
and
remove
carbon
or
oxide

deposits
but
do
not
wear

away
porce

lain
If

deposits
are
too
stubborn

discard

plugs

After

cleaning
spark

plugs
renew

firing
surface
of
electrodes
with
file

mentioned

above
Then
check

spark

plug
gap
with
wire

feeler

gauge
All

spark
plugs
new
or
used

should
have

the

gap
checked
and
reset

by
bending

ground
electrode

EEOSO

Fig
EE
77
Setting
Spark
Plug
Gap

Except
FU
model

EE
29
Carbon

fouled

EE079

Worn

Carbon

fouled

Worn

EE601

Fig
EE

76

Spark

Plug

EE586

Fig
EE
78

Setting
Spark
Plug

Gap
FU
models

Engine
Electrical

System

IV
IGNITION
CIRCUIT

When

engine
does
not

start

If

there
is
no

problem
in
fuel

system

ignition
system
should
be

checked
This
can
be

easily
done

by

detaching
a

high
tension
cable
from

distributor

starting
engine
and
ob

serving
oondition
of

spark
that

occurs
between

high
tension
cable
and

engine

block
After

checking
this

repair
as

necessary
tery
and
anti
dieseliilg
wlenoid

valve
connector
to
cuI
off

supply

of
fuel
10

engine
Then
observe
the

condition
of

sparks
while
starter

motor
is
in

operation

Note
Turn

ignilion
switch
off
and

disconnect
ground
cable
from
bat

Condition
Location

Probable
cause
Corrective
action

No

spark
at
all
Distributor

Breakage
of
lead
wire
on
low
tension

side

Repair

Poor
insulation
of

cap
and
rotor
head

Replace

Open
pick
up
coil

Replace

Air

gap
wider
than

specification
Adjust

Ignition
coil
Wire

breakage
or
short
circuit

of
coil

Replace
with
new
one

High
tension
cable
Wire

coming
off

Repair

Faulty
insulation

Replace

IC

ignition
unit

Faulty
IC

ignition
unit

Replace

Breakage
of
circuit

Replace

Detached
connection

Repair

Spark
length
Spark
plugs
Spark
plug

gap
too

wide
Correct
or

replace

More
than
6

mm

Too

much
carbon
Clean
or

replace

0
24
in

Broken
neck

of
insulator
Replace

Expiration
of

plug
life

Replace

Distributor
Air

gap
too
wide

Correct

IC

ignition
unit

Faulty
IC

ignition
unit

Replace

Breakage
of
circuit

Replace

Detached
connection

Repair

EE
37