1977 DATSUN PICK-UP Service Manual

I
Emission

Control

System

Ignition
switch

Ignition

key
Off

T

I

I

I

Battery

I

J

77

77
Relay

J

Floor

temperature

sensing
swi

tch
Floor

temperature

warning

lamp

77
77

EC332

Fig
EC

70
Win

ng
diagram
of
floor
temperature
warning
system

r
l

J
@

1

Floor

temperature

Ij

cr

EC556

Fig
EC
71
Location

of
iJoor

temperature
sensing
switch

OPERATION

Floor

temperature
will
exceed

nor

mal
level

when

temperature
rise
in

the

exhaust

system
succeeding
the
cata

lytic
converter
is
caused

byeilher
an

engine
malfunction

or
severe

driving

conditions

Under
this
condition
the

floor

temperature
sensing
switch
turns

off

causing
the

starting
switch
line
of

the
floor

temperature
relay
to
turn
off
and
the

ignition
switch
line
to
turn
on

as
a
result
the
floor

temperature

warning

lamp
comes
on

When
the
floor

temperature
is

lower
t

an
the

specific

temperature

the

floor

temperature
sensing
switch

turns

on
The

ignition
line

of
the
floor

temperature
relay
turns
off
while
the

starting
switch
side
is
in

on
The
floor

temperature
warning

lamp
goes
out

EC
2B
The

lamp
is

functioning
sa
tis

factorily
if

it
is
remains
on

while
the

starting
motor
is
in

operation
The

lamp
goes
out
when

the

ignition

switch
is
in

IG

position

The

foUowing
chart

furnishes
the

information
on

the

relationship
be

tween

floor

temperatures

warning

lamp
and

sensing
switch

L

Contact
close

ECJ40

I

Contaclopen

ECJ41

Fig
EC
72

Operation

of
floor

t

mperature
sen6ing

6witch

REMOVAL

Floor

temperature

sensing

switch

1
Remove
seat

Seat
section
of

service
manual

2
Remove

sensing
sWitch
as
outlined
in

the

Body
and
Frame

floor

temperature

Floor

temperature
relay

From
under

relay
cover
remove

this

part
Refer
to

Figure
EC
73

Floortemperature

EC783

Fig
EC
73
Location

of
floor

ttmperature
relay

Floor
temparature
warning

lamp

Refer

to

Figure
EC
74

for
the

loca

tion
of
this

part

L

1t

1

RAt

Fig
EC
74
Location
of
floor

temperature
warning
lamp

INSTALLATION

To
install
reverse
the
order
of

rem
ovaL

INSPECTION

Floor
warning
temperature

system

Apply
parking
brake
Shift

gears

into
Neutral
foI
manual
transmission

and
Neutral
or
Park
for
automatic

transmission

1
Ensure
that
floor

temperature

warning

lamp
lights
when

ignition

switch
is
iumed

to
the
S

position

If

not
check

lamp
for
burned

bulbs

Replace
bulb
if
bulb
is
burned
out

If

bulb
is

not
burned
trace
wire
s

back
to

ignition
switch

Repair
or

replace
if

necessary

2
Be

sure
that
floor

temperature
is

cool
below
800C

1760Fj
before

carrying
out
the

following
procedure

I
Remove
rearseat

2

Ignition
switch
is

turned
to
the

IG

position

3
Ensure
that
floor

temperature

warning
lamp
goes
out

4
Heat

surrounding
areas
of
floor

temperature
sensing
switch
with
a

proper
heater
to
ensure
that
floor

temperature
warning
lamp
glows
when

floor
is
heated

to
the

specifications
as

shown
in
the
table
below
Emission
Control

System

Temperature

sensing
switch

Contact
close
Temperature

warning
lamp

Off

Contact
open
On

Note

Avoid

heating
floor

tempera

ture

sensing
switch

directly

If

lamp
does

not
glow
check
floor

temperature
sensing
switch
connector

for

continuity
with

a
circuit
tester

If

continuity
should
exist
after

heated

surrounding
areas
of
floor
tem

perature
sensing
switch

replace
tem

perature
sensing
switch

If
con

tinuity
does

not
exist

trace

the

wiring
back
to

relay
or
check
the

following
step
3

Repair
or

replace

wire
s
if

necessary

Note
The

floor

temperature
sensing

switch

may
be
heated

through
the

floor

by
a

proper
heater

3
Turn

ignition
switch
to
the

IG

position
and
disconnect
floor

temper

ature

sensing
connector
The

lamp

should
remain

on
If

not
check
floor

temperature
relay
for

continuity
with

2
00

r
I

141

J

To
floor

temperatwe

warning
lamp

2
From

S

position

3
From

IG

position

4

From

ignition
switch

5
To
floor

temperature

sensing
switch
O

When
floor

temperature

warning
lamp
lights

Check
floor

temperature
warning

lamp

1

Open
or

shorj
circuit
in

wiring

harness

2

Check
fuel

system
with

regard
to

the

following
items

Refer
to

Inspec

lion
of
Fuel

System

EC
29
Floor

temperature

Below
1050C
221
OF

Above

1050C
221
OF

a
circuit

tester

Referring
to
the

following
floor

temperature
relay
if

relay
is
normal

trace
wire
s

back
to

ignition
switch

Repair
faulty
wiring

Floor

temperature
relay

When

checking
floor

temperature

relay
for
unit

remove
it
and

proceed

as
follows

1

Check
for

continuity
between

@

and

ID
Continuity
should
exist

Check
for

continuity
between

CD

and@
Continuity
should
exist

Check
for

continuity
between

CD

and

@
Continuity
should
not

exist

2

Apply
a
12

volt
doc
across

@
and

ID
to

ensure
that

continuity
exists

between

CD
and

@
and
that

con
ti

nuity
does

not
between

CD
and

@
If

test
results
dn

not

satisfy
the
above

replace
the

floor

temperature
relay

EC344

Fig
EC
75

Checking
floor
temperature
relay

1
Float
level

2
Choke

3

Normal
fuel

supply
system
Prima

ry
and

secondary

4
Accelerator

pump

5
Power
valve

6
B
C
D
D

7
Fuel
strainer

8
Air
cleaner

3

Check

ignition
system
with

regard

to

the

following
items

Refer
to

Inspection
of

Ignition
System

1

Ignition
AMP

2
Distributor
Emission
Control

System

3

Ignition
coil

4

High
tension
code

5

Spark

plug

4

Check
idle

CO

adjustment
Refer

to

Inspection
of
Idle

CO

Adjustment
Note
Even
if
there
is

nothing

wrong

with

engine
the

warning
lamp
may

come
on
if
vebicle
is

being
driven

on
a

steep
slope

continuously
in

lower

gears
at

high
engine
speeds

EVAPORATIVE

EMISSION

CONTROL
SYSTEM

CONTENTS

DESCRIPTION

OPERATION

INSPECTION

FUEL
TANK

VAPOR
LIQUID

SEPARATOR

AND

VAPOR
VENT
LINE

DESCRIPTION

The

evaporative
emission
control

system
is

used
to

reduce

hydrocarbons

emitted
to
the

atmosphere
from
the

fuel

system
This

reduction
of

hydro
EC
30

EC

30

EC

31
CARBON

CANISTER
PURGE
CONTROL

VALVE

CARBON
CANISTER

FILTER

FUEL

TANK

VACUUM
RELIEF
VALVE
IEC
32

IEC
32

EC

32

EC
31

carbons
is

accomplished
by
activated

charcoals
in
the
carbon
canister

This

system
is
made

up
to

the

following

I

Fuel
tank
with

positive

sealing
filler

cap

@
2

Vapor
liquid
separator

3

Vapor
vent

line

4
Carbon

canister

5
Vacuum

signal
line

6
Canister

purge
line

5

OPERATION

Fuel

vapors
from

the
sealed
fuel

tank
are
led

into
the
carbon
canister
1
Fuel
tank

2
Fuel
nIler

cap
with
vacuum

relief

valve

3

liquid

vapor
separator
4

Vapor
vent
line

5

Canister

purge
line

6
Vacuum

signal
line

7
Carbon

canister

EF274

Fig
EC
76

Schematic

drawing
of
l
Iaporotive

emiaion

control6ydem

The

canister
is
fined
with
activated

charcoals

to
absorb

the
fuel

vapors

EC
30
when
the

engirie
is

at
rest
or
at

idlin
ll

See

Figure
EC

77

J

1
Fuel
tank

2

Fuel
f1l1er

cap
with

vacuum

relief
valve

3

Liquid
vapor

separator

4

Vapor
vent
line

5
Vacuum

signalUne

As
the
throttle
valve

opens
and

vehicle

speed
increases

vacuum

pres

sure
in

the
vacuum

signal
line
forces

rHL
JL

I

EC785

INSPECTION

FUEL
TANK

VAPOR

LIQUID
SEPARATOR

AND

VAPOR
VENT
LINE

I

Check
all
hoses
and
fuel

tank

mler

cap

2
Disconnect
the

vapor
vent

line

connecting
carbon
canister
to

vapor

liquid
separator

3
Connect
a
3

way
connector

a
Emission

Control

System

Close
at

idling

Open
at
rest

i

J

17
f

Fuel

vapor

6
Canister
purge
line

7
Throttle
valv

8

Engine

9
Carbon
canister

10
Activated
carbon

11

Screen
12
Filter

13

Purge
control
valve

14

Spring

15

Diaphragm

16
Fixed

orifice
i

j

EC784

Fig
EC
77

Evaporative
emu
ion
control

sy
tem

Fuel

vapor
flow
when

engine
i6

at
red
or

idling

the

purge
control
valve
to

open
and

admits
an

orifice
to
intake
manifold

and
fuel

vapor
is

then
drawn
into
the

I

J

o
I

Fuel

vapor

Fresh
air
intake

manifold

through
the
canister

purge
line
See

Figure
EC
7B

Fig
EC
78

Evaporative
emiuion
control

system

Fuel

vapor
flow
when

engine
i

running

manometer
and
a
cock
or
an

equiva

lent
3

way

charge
cock
to

the
end
of

the

vent
line

4

Supply
fresh
air
into

the

vapor

vent
line

through
the
cock
little

by

little
until

pressure
becomes
368

mrnH20

14
5
inH20

5
Shut
the
cock

completely
and

leave
it

unattended

6
After
2
5
minutes

measure
the

height
of
the

liquid
in
the

manometer

7

Variation
of

height
should
remain

EC
31
with
25
mmH20
0
98
inH20

8
When
filler

cap
does
not
close

completely
the

height
should

drop
to

zero
in

a
short
time

9
I
f

the

height
does
not

drop
to

zero
in

a
short
time
when
filler

cap
is

removed
it
is

the
cause
of
a

stuffy

hose

Note
In

case
the

vent
line
is

stuffy

the

breathing
in
fuel
tank
is
not

thoroughly
made
thus

causing
in

sufficient

delivery
of
fuel
to

engine

or

vapor
lock
It
must
therefore
be

1

3
connectur

COCk

Air
Manometer
Emission
Control

System

repaired
or

replaced

368
mmH20

14
5
inH20

LL

IPO
liqUid
epo
o

36

r
@

Carbon
canister

EC786

Fig
EC
79

Checking

evaporative
emmion

control

syatem

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
so

Checking
carbon
canuter

purge
control
valve
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

phragm
kit

which
is
made

up
of
a

retainer
a

diaphragm
and
a

spring

@

@

1
Cover

2

Diaphragm

3
Retainer

4

Spring

ET350

Fig
EC
81
Carbon

catU
ter

purge

control
valve

CARBON

CANISTER
FILTER

Check
for
a
contaminated

element

Element

can
be
removed

at
the

bottom
of

canister

installed
on
vehicle

body

EC
32
ET37Q

Fig
EC
s2

Replacing
carbon

canuter

filter

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

uni
t

l

u

ET369

Fig
EC

83
Fuel

filler
cap

Emission
Control

System

SPECIAL
SERVICE
TOOLS

Tool
number
For
Reference

No

Description
use

page
or

tool
name
on

Figure
No

STI
98
10000
For

removing
and

installing
the
rotor

ring
assembly
L20B

Fig
EC
29

A14

Fig
EC
41

Hexagon
wrench

SE279

2

ST
19900000

For

assembling
the
vanes

L20B
Fig
EC
39

A14

Dummy
shaft

SE284

3

STl9890000
Used
as
a
mount
when
rotor
is
removed
and
when

bearing
is

installed
L20B

Fig
EC
32

A14

fig

IlC
35

f

Rotor

adapter

SE347

4

STl9940000
Used
when
rotor
is
removed
and
when
front

bearing
installed
L20B

Fig
EC
32

A14

Fig
EC
35

Bearing

Pressing

tool

d

9E348

This

service
tool
is

designed
for
use
in

disassembly
and

assembly
of
the

air

pump

EC
33

Emission
Control

System

Tool
number
For
Reference

No
Description

use

page
or

tool

name
on

Figure
No

5
STl9930000
Used
as
a
mount
when
front

bearing
is
removed
L20B

Fig
EC
33

Al4

Bearing
adapter

E9

SE349

6
STl9910000
Used
as
a
drift
when

front

bearing
is
installed
Also
used
as
a

support
L20B

Fig
EC
33

when
rotor
is
installed
Al4

Fig
EC
36

Fig
EC
37

Bearing
driver

SE350

o
L20B

AI4
Fig
EC
36

Fig
C
37
7
STl9920000
Used
as
a
drift
when
rotor
is

installed

Rotor

stand

SE351

8
ST19870000
Used

as
a

adapter
when
air

injection

pump
pressure
is
tested
L20B

Al4
Page
EC
18

Air

pump
test

gauge
adapter

SE389

EC
34

DATSUN
PICK

UP

MODEL
620

SERIES

I
NISSAN

I

NISSAN
MOTOR

CO
LTD

TOKYO
JAPAN
SECTION

EE

ENGINE

ELECTRICAL

SYSTEM

BATTERY

EE
2

STARTING

MOTOR
EE

4

CHARGING

CIRCUIT
EE

12

ALTERNATOR
EE
15

REGULATOR

EE
20

IGNITION

CIRCUIT
EE

26

DISTRIBUTOR

EE

30

Non

California

models

DISTRIBUTOR
California
models
EE

33

TRANSISTOR
IGNITION
UNIT

California
models

IGNITION
COIL

SPARK
PLUG
EE
36

EE

46

EE
47