fuel DATSUN PICK-UP 1977 Service Manual

General
Information
L

GENERAL
INFORMATION

CONTENTS

MOOEL
VARIATION
GI
3

APPROXIMATE
REFILL

CAPACITIES
GI
B

IDENTIFICATION
NUMBERS
GI
5

RECOMMENDED
FUEL
GI

B

LIFTING

POINTS
AND

TOWING
GI
B

RECOMMENDED
LUBRICANTS
GI

8

LIFTING
POINTS
GI

B
RECOMMENDED
SAE
VISCOSITY

SUPPORTABLE
POINTS
GI
7
NUMBER
GI
8

TOWING
GI
7
LUBRICANT
SPECIFICATIONS
GI
g

TIE
DOWN
GI
7

MODEL
VARIATION

Differential

Pay
load

Destination

Class
Model

Engine
Transmission
carrier
model

kg
Ob

and

gear
ratio

I
HL620TUV
F4W7lB

Standard

I
HL620FTUV
FS5W71
B

wheelbase

S

I
HL620KTUV
3N7lB

E

I
HLG620TUV
Ol

F4W7lB

u
0

0

E

Long
E

I
HLG620FTUV
0

FS5W71B

wheelbase

0

I
HLG620KTUV
8
a
3N7lB

0
Ol

0

u

I
KHL620TUV
Ol

F4W7lB

u

Deluxe

I
KHL620FTUV
FS5W7lB

Cab

KHL620KTUV
3N7lB
Hl90

500
1
1

00

L20B

4
375

u
i

0

HL620TU
F4W71
B

Standard

HL620FTU
FS5W7l
B

wheelbase

U

HL620KTU
3N7lB

S

0

I
HLG620TU
0

E
F4W7lB

0

8

Long

I
HLG620FTU
0

FS5W7lB

wheelbase

IHLG620KTU
Q
u

3N7lB

0
0

Z

KHL620TU
F4W71B

Deluxe

Q

KHL620FTU
FS5W7l
B

Cab

I
KHL620KTU
3N7lB

GI
3

General
Information

APPROXIMATE
REFILL
CAPACITIES

I
Uter
u
s

measure

Imper
measure

Fuel
tank

I
45
J
IUi

gal
9

Ji

gal

Cooling
system
ManUal
transmission

I
8

0J

I
8Jiqt
7

qt

with
heater

Automatic
tr
smission

I
7

8J

I
8Y

qt

6Jiqt

Engine
lubrication
with
oil

f1lter

I
4

3J

I
4
Ji

qt
3

qt

system

without
oil
f1lter

I
3

8J

I
3Xqt
4

ql

I
4

speed
transmission

I
1

7J

I
3X

pl
3

pI

Manual
transmission

I
5

speed
transmission

I
2
0

I
4Y

pt
3Mpt

Automatic
transmission

I
5
s
J

I
5Uqt
4Uqt

Steering

gear
box

I
0
33J

I
pt
pt

Differential

carrier

I
1
0
J

I
2M

pI
I

pt

RECOMMENDED
FUEL

Use

an
unleaded
or
low
lead

gasoline
with
a
minimum
octane

rating
of
91

RON
Research

Octane

Nuniber
For
California

models
use
only
unleaded

gasoline
to

protect
the

catalytic
converter
from
contamina

tion

RECOMMENDED

LUBRICANTS

RECOMMENDED
SAE

VISCOSITY

NUMBER

C

ENGINE

on

12O
II
O
10Vt4ll
10Wf
2

I
ICWI
I

ao
40

J

SAE
5W
20
oils

ate
not
lecom

mended
for
sustained

high
speed

drivin

GEAR
On

I

J

w

c

30
20
0

20
40
60
80
100

Temperature
Range

Anticipated
Before

Next
Oil

Change
OF

GI
8

DATSUN
PICK
UP

MODEL

620
SERIES

I
NISSAN

I

NISSAN
MOTOR
CO
LTD

TOKYO
JAPAN
SECTION
ET

ENGINE

TUNE
UP

ENGINE
TUNE
UP
ET
2

BASIC
MECHANICAL
SySTEM
ET
7

IGNITION
AND

FUEL

SYSTEM

EMISSION
CONTROL
SYSTEM
ET

13

SERVICE
DATA
AND

ET

25

SPECIFICATIONS

TROUBLE
DIAGNOSES
AND

CORRECTIONS
ET
9

H

27

Yellow

line

Spark
delay
valve
to

distributor

Spark
delay
valve
to
vacuum
tube

Distributor

to
vacuum
tube

Vacuum
tube
to
carburetor

Vacuum
tube
to
canister

Green
line

Anti

backfire
valve
to
intake
mani

fold

Air

control
valve
to

emergency
air

relief
valve

Intake
manifold
to
vacuum
hose

connector

Intake

manifold
to
canister

CHECKING
ENGINE

COMPRESSION

COMPRESSION
PRESSURE

TEST

I
Warm

up
engine
sufficiently

2
Disconnect

all

spark
plugs

3
Disconnect
anti

dieseling
solenoid

valve
connector

4

Properly
attach
a

compression

tester
to

spark

plug
hole
in

cylinder

being
tested
Engine
Tune

up

I

ET010
Different

compression
in
two
or

more

cylinders
usually
indicates

an

improperly
seated
valve
or
broken

piston
ring

9
Low

compression
in

cylinders
can

result
from
worn

piston
rings
This

condition

may
usually
be

accompanied

by
excessive

fuel

consumption

TEST
RESULT

If

compression
in

one
or
more

cylinders
is
low

pour
a
small

quantity

of

engine
oil
into

cylinders
through

the

spark
plug
holes
and
retest
com

pression

I

If

adding
oil
increases
the
com

pression
pressure
the
chances
are
that

rings
are

faulty

2

If

pressure
stays
low

probable

cause
is

that
valve
is

sticking
or

seating

improperly

3
If

cylinder
compression
in

any

two

adjacent
cylinders
is

low
and
if

adding
oil
does
not

help
the

compres

sian
there
is

leakage
past
the

gasket

surface

Oil
and
water
in

combustion
cham

bers

can
result
from

leakage

IGNITION
AND

FUEL
SYSTEM
Fig
ET
10

Teding

compression

pressure

5

Depress
accelerator

pedal
to

open

throttle
and
choke
valves

Note
Do

not

pump
pedal

6
Start

engine
as

quickly
as

pos

sible

7

Compression
pressure

kg
cm2

psi
at

rpm

Standard

12
0

171
350

Minimum

9

0
128
350

8

Cylinder
compression
in

cylinders

Should
not
be
less
than

80
of

highest

reading

CONTENTS

CHECKING
BATTERY
ET
9

CHECKING
DISTRIBUTOR
CAP
ROTOR

CHECKING
AND

ADJUSTING
IGNITION
AND
CONDENSER
ET
11

TIMING
ET
10

CONDENSER
ET
11

ADJUSTING
IGNITION
TIMING
ET10

ADJUSTING
CARBURETOR
IDLE
RPM

CHECKING
AND
REPLACING
SPARK
PLUG
ETlO
AND
MIXTURE
RATIO
ET

11

CHECKING
DISTRIBUTOR
OPERATING
IDLE

LIMITER
CAP
ET
12

PARTS
AND

IGNITION
WIRING
ETlO
CHECKING
CARBURETOR
RETURN
SPRING
ET

12

BREAKER
POINTS

lNon
California
models

ET
10
CHECKING
CHOKE
MECHANISM

AI
R

GAP
lCalifornia
models
ET11
Choke

plate
and

linkage
ET13

DISTRIBUTOR
ET
11
CHECKING
FUEL

LINES

IGNITION
WIRING

ET
11
Hoses

pipings
connections
etc

ET
13

REPLACING
FUEL
FILTER
ET
13

CHECKING
BATTERY

Check

electrolyte
level
in

each
bat

tery
cell
I
Unscrew

each
filler

cap
and

inspect
fluid
level
If
the
fluid
is
low

add
distilled
water
to

bring
the
level

up
approximately
10
to
20
mm
0
39

H
9
to
0
79

in
above
the

plates
Do
not

overfill

2
Measure
the

specific
gravity
of

battery
electrolyte

CHECKING
CHOKE

MECHANISM
Choke

plate
and

linkage

1
Check
choke

valve
and
mech

anism

for
free

operation
and
clean
or

replace
if

necessary
A
binding
can

result
from

petroleum

gum
formation

on
choke
shaft

or
from

damage

2

Check
bimetal
cover

setting

Index
mark

on
bimetal

cover
is

usually

set

at
center
of
scale

Note

Always
align
the
index

mark
on

bimetal
cover
with
the
center
index

mark
on
choke

housing

3

Every
day
before

starting
engine

depress
the
accelerator

P
dal
to
see
if

choke
valve
is
closed

automatically

If
it
fails
to
be
closed
the

chances

are
that
link
movement
is
unsmooth
Engine
Tune

up

or
that
bimetal
is

out
of
order
Refer

to
Carburetor
in
Section
EF

CHECKING
FUEL

LINES
Hoses

pipings
connections

etc

Check
fuel
lines
for

loose
con

nections

cracks
and

deterioration

Retighten
loose
connections

and
re

place
any
damaged
or
deformed

parts

REPLACING
FUEL

FILTER

Check
for
a

contaminated
filter
and

water

deposit
All

engines
use
a

replaceable

cartridge
type
fuel
filter
as
an
as

sembly

@

Fig
ET

19
Fuel

filler
ET011

EMISSION
CONTROL
SYSTEM

CHECKING
CRANKCASE
EMISSION

CONTROL
SYSTEM

REPLACING
P
C
V
VALVE
AND

FILTER

CHECKING
VENTILATION
HOSE

CHECKING
EXHAUST
MANIFOLD
HEAT

CONTROL
VALVE

CHECKING
SPARK
TIMING

CONTROL

SYSTEM

SPARK
DELAY
VALVE

Automatic
transmission
models

only

INSPECTION

CHECKING

AUTOMATIC
TEMPERATURE

CONTROL
AIR

CLEANER

OPERATING
PRESSURE
OF

BOOST

CONTROLLED
DECELERATION
DEVICE

B
CD
D
I
ADJUSTMENT

CHECKING
B
C
DD
CIRCUIT

WITH

FUNCTION
TEST

CONNECTOR

CHECKING

CRANKCASE

EMISSION

CONTROL

SYSTEM

REPLACING
P
C
V
VALVE

AND
FILTER

Check
P

C
V

valve
in

accordance
CONTENTS

ET
13

ET
13

ET
14

ET
14

ET
14

ET
14

ET
15

ET
15

ET
17

ET
17
ADJUSTMENT
OF
SET
PRESSURE
OF

BOOST

CONTROLLED
DECELERATION

DEVICE
B

CD
D

CHECKING
B
C
D
D
SOLENOID
VALVE

CHECKING
AMPLIFIER
Manual

transmission
models

REPLACING
AIR
PUMP
AIR
CLEANER

ELEMENT

CHECKING
EXHAUST
GAS
RECIRCULA

TION
E
G
R
CONTROL
SYSTEM

CHECKING
EVAPORATIVE
EMISSION

CONTROL

SYSTEM

CHECKING
CATALYTIC
CONVERTER

INSPECTION

CHECKING
FLOOR
TEMPERATURE

WARNING
SYSTEM

INSPECTION

with
the

following
method

With

engine
running
at

idle
remove

ventilator
ose
from
P
C
V

valve
If

the
valve

is

properly
working
a

hissing

ET
13
ET
18

ET
20

ET
20

ET
20

ET
20

ET
22

ET

23

ET
23

ET

23

ET
23

noise
will
be

heard
as
air

passes

through
the

valve
and
a

strong
vacuum

should
be
felt

immediately
when

a

finger
is

placed
over
valve
inlet

Engine
Tune

up

EC284

When

installing
this
valve

ensure

that
it

properly
oriented
This
valve

should
be

replaced
periodically
Refer

to
Maintenance
Schedule

I

To

distribut0
From

carburetor

Yl
r

EC278
l

Fig
ET
24
Operation
of
spark
delay

value

I

I

Carburetor
side

Distributor
side

rJmlL
lr

EC346

Fig
ET
25
Checking

spark
delay
value
Distributor
side

Brown

lOne
way
umbrella
valve

2
Sintered
metal
disc

Fig
ET
23
Spark
delay
valve

INSPECTION

I
Remove

spark
delay
valve

2
Blow
air

through
port
on

carbure

tor
side
then

through
the

other
port

on
distributor
side

Spark
delay
valve

is
in

good
condition
if
when

finger
is

placed
over

port
on
distrib
side

ajr
flow
resistance
is

greater
than
that

on
the
other

side
See

Figure
ET
25

3
If
a
considerable
air
flow
resist

ance
is
felt
at

port
on
distributor
side

in

step
2

above
and

if
the
condition
of

spark
delay
valve
is

questionable
dip

port
on
carburetor

side
into
a

cup

fIlled
with
water
Blow
air

through
the

other

port
Small
air
bubbles
should

appear

EC279

Fig
ET
26

Checking
spark
delay
ualue

Note
Be

careful
to

avoid

entry
of
oil

or
dirt
into
valve

ET
15
CHECKING

AUTOMATIC

TEMPERATURE

CONTROL
AIR

CLEANER

1
Air
cleener
element

Viscous

paper
type
air
cleaner
ele

ment
does
not

require
any
cleaning

opera
tion

until
it
is

replaced
periodi

cally
Brushing
or

blasting
operation

will

cause

clogging
and
result
in
enrich

ment
of
carburetor
mixture
and

should
never
be
conducted
For
reo

placement
interval
of
air
cleaner
ele

ment
refer

to
Maintenance
Schedule

2
Hot

elr
control
system

In
warm
wealher
it
is
difficult
to

find
ou

t
malfunction
of
hot
air
control

system
In
cold
weather
however

malfunction
of
air
control
valve
d

e
to

disconnection
or
deterioration
of
vacu

um
hose
between
intake
manifold
and

vacuum
motor
and
insufficient
dura

bili

ty
of
air

con
trol
valve
will
cause

insufficient
automatic
control

opera

tion
for
intake
air
and
result
in

engine

disorder

including

I

Stall
or
hesitation
of

engine

opera

tion

2

Increase
in
fuel

consumption

3
Lack
of

power

These

phenomena
reveal
malfunc

tionof
hot
air
control

system
If
these

phenomena
should
occur
check
hot

air
control

system
as
described
in
the

following
before

carrying
ou

t

inspec

tion
of
carburetor

2
1
Vacuum
hoses

Intake
manifold
to
3

way
connec

tor
3

way
connector
to

temperature

sensor
3

way
connector
to
idle
com

pensator
temperature
sensor
to

vacu

um
motor

1

Check
that
vacuum
hoses
are
se

curely
connected
in

correct

position

2
Check
each
hose
for
cracks
or

distortion
hose

clip
for
condition

r
EC350

Fig
ET
43

Cleanill
l
E
G
R
control

lJ
Jlue

Thermal
VBCuum
valve

Dismount
thermal
vacuum
valve

from

engine

Note
Before

dismounting
drain
e

gine
coolant
from

engine

Apply
vacuum
to
thermal
vacuum

valve
and
check
to
be
sure
that
ther

mal
vacuum
valve

opens
or
closes
in

response
to

engine
coolant

tempera

lurt
i1
i

iYCl
lt
lt
U

Thermal
vacuum
valve
should

open

at
a

temperature
of
57
to
630C
134

to
1450F

completing
the
vacuum

passage

Note
Do
not
aUow
water
to

get

inside
the
thermal
vacuum
valve

EC
242

Fig
ET
44

Checkill
lthermallXlCuum

valve
Engine
Tune

up

CHECKING

EVAPORATIVE

EMISSION
CONTROL

SYSTEM

Vapor
Rnes
and
fuel

vepor

control
valve

Checking
fuel
tank

vapor

liquid

separator
and

vapor
vent
line

I
Check
all
hoses
and
fuel
tank

roler

cap

2
Disconnect
the

vapor
vent
line

connecting
carbon
canister
to

vapor

liquid
separator

3
Connect
a
3
way
connector
a

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

mmH20
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

with
25

mm
l20
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

thl
causing
in

suffICient

delivery
of
fuel
to

engine

or

vapor
lock
It
must
therefore
be

repaired
or

replaced

3
way
connectoT

36
mmH20

14
5
inH20

c

s
I

W

@

Carbon
canister

r

EC786

Fig
ET
45

Checking
evaporative
emission
control

By
tem

Checking
carbon
canister

purge

control

valve

Check
for
fuel

vapor
leakage
in
the

distributor
VC
line
at

diaphragm
of

carhon
canister

purge
control
valve

To
check
for

leakage

proceed
as

follows

1
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
VC
hole
in

carbon
canister
and
ensure
that
there

is

no
leak

ET

22
I

I

L

I

ET349

Fig
ET
46

Checking
carbon
cani
ter

purge
control
valve

3
If
there

is
a
leak

remove

top

cover
from

purge
contiol
valve
and

check

for
dislocated
or

cmcked
dia

phragm
If

necessary
replace
dia

phmgm
kit

which
is
made

up
of
a

retainer

diaphragm
and

spring

I
@

1
Cover

2

Diaphragm

3
Retainer

4

Diaphragm
spring

Fig
ET
47
ET350

Carbon
caniater

purge

control
valve

Carbon
unlster

filter

Check
for
a
contaminated

element

Element
can
be
removed
at

the

bottom
of
canister

installed
on
vehicle

body

Fig
ET
48

Replacing
carbon

canister

filter

Fuel
tank

vacuum
relief

valve

operation

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
Engine
Tune

up

3
If
valve

is

clogged
or
if
no
resist

ance
is

felt

replace
cap
as
an
assem

bled
unit

r

u

ET369

Fig
ET
49
Fuel

filler
cap

CHECKING

CATALYTIC

CONVERTER

INSPECTION

Preliminary
inspection

Visually
check
condition
of
all

component
parts
including
hoses

tubes
and
wires

replace
if

necessary

Refer
to

Inspection
of
A
I

S
on

page
EC
17

Catalytic
converter

Whether

catalytic
converter
is
nOf

mal
or
not
can
be
checked

by
ob

serving
variation
in
CO

percentage

The

checking
procedure
is

as
follows

Apply
parking
brake
Shift

gears

into

Neutral
for
manual
transmission

and
Neutral
or
Park
for
automatic

transmission

1

Visually
check

catalytic
converter

for

damage
or
cracks

2
Remove
air

hose
between
5

way

connector
and
air

check
valve

Plug
the

disconnected
hose
to

prevent
dust

from

entering
Refer
to

page
ET
12

3
Check
carburetor

pipes
for

proper

connection

4

Warm

up
engine
sufficiently

5
Race

engine
1
500
to
2
000

rpm

two

or
three
times
under
no
load
then

run

engine
for

one
minute
at

idling

speed

6

Adjust
throttle

adjusting
screw

until

engine
attains
to

specified
speed

Refer
to

page
ET
12

7

Check

ignition
timing
If

neces

sary

adjust
it
to

specifications
Refer

to

page
ET
10

ET
23
8

Adjust
idle

adjusting
screw
until

specified
CO

percentage
is

obtained

Refer
to

page
ET
12

9

Repeat
the

adjustment
process
as

described
in

steps
5
to

8
above
until

specified
CO

percentage
is

obtained

Note

Adjustment
in

step
9
should
be

made
ten
minutes
after

engine
has

warmed

up

10
Race

engine
1
500
to
2
000

rpm
two
or
three
times
under

no
load

and
make

sure
that

specified
CO

per

centage
is
obtained

I
1
Remove

cap
and
connect
air

hose
to
air
check
valve

If

idling

speed
increases

readjust
it

to

specified
speed
with
throttle
ad

justing
screw

12
Warm

up
engine
for
about
four

minutes
at
2
000

rpm
under
n
load

13
Measure

CO

percentage
at

idling

speed
After

step
12
has
been
com

pleted
wait

for
one
minute
before

making
CO

percentage
measurement

14

If
CO

percentage
measured
in

step
13
is
less
than
0
3
the

catalylic

converter
is

normal

15
If
CO

percentage
measured
in

step
13
is

over
0
3
recheck
A
I
S

and

replace
air

check
valve
Then

perform
inspection
steps
12

and
13

16
If
CO

percentage
is
still

over

0
3
in

step
15

catalytic
converter
is

malfunctioning
Replace
catalytic
con

verter

CHECKING
FLOOR

TEMPERATURE

WARNING
SYSTEM

INSPECTION

Floor

warning
temperature

system

Apply
parldng
brake
Shift

gears

into
Neutral
for

manual
transmission

and
Neutral
or
Park
for
automatic

transmission

1

Ensure
that
floor
tern

perature

warning

lamp
lights
when

ignition

switch
is

turned
to
the
S

position

If
not
check

lamp
for
burned

bul
bs

Replace
bulb
if

bulb
is
burned

ou
t

If

bulb
is
not
burned
trace

wireis

back

to

ignition
switch

Repair
or

replace
if

necessary

2

Be
sure
that

floor

temperature
is

cool

below
800C

1760F
before

carrying
out
the

following
procedure

1
Remove
rear
seat

2

Ignition
switch
is
turned
to

the

Temperature

sensing
switch
Temperature

warning
lamp

Contact
close
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
tern

rv
wnTP
sen
cinq
S
Vitch

reolace
tem

perature
sensing
switch

If

continuity
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
anf
disconnect
floor

temper

ature

sensing
connector
The

lamp

should
remain

on
If
not

check
floor

4
0
3

UJ

GJO
Engine
Tune

up

IGU

position

3
Ensure

that
floor
tem

perature

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

lh

specifications
as

shown

in
the
table
below

Floor

temperature

Below

1050C

22IOF

Above
1050C

2210F

temperature
relay
for

continuity
with

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

rela

To

check
floor

temperature
relay

remove
it

and

proceed
as

follows

1
Check
for

continuity

between@

and

@
Continuity
should

exist

Check
for

continuity
between

D

and@
Continuity
should
exist

Check
for

continuity
between

D

and@
Continuity
should
not
exist

2

Apply
a
12
volt
doC

across@and

@
to

ensure
that

continuity
exists

between

D
and@and
that

continuity

does
not
between

D
and

@
If
test

r
I

141

ET
24
results
do
not

satisfy
the
above
reo

place
the
floor

temperature
relay

When
floor

temperature

warnln8
lamp
118hts

Check
floor

temperature
warning

lamp

I

Open
or

short
circuit
in

wiring

harness

2

Check
fuel

system
with

regard
to

the

following
items
Refer
to

Inspec

tion

of
Fuel

System

I
Floa

t
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

I

IgnItion
AMI

2

Distributor

3

Ignition
coil

4

High
tension

code

5

Spark

plug

4

Check

idle
CO

adjustment
Refer

to

Inspection
of
Idle

CO

Adjust

roeoC

Note
Even

if
there
is

nothing
wrong

with

engine

warning
lamp
may

come
on
if
vehicle
is

being
driven

on
a

steep
slope
continuously
in

lower

gears
at

high
engine

speeds

To
floor

temperature

warning
lamp

2
From
S

position

3
From
GOt

position

4

From

ignition
switch

5
To
floor

temperature

sensing
switch

EC343

Fig
ET
50

Checking
floor

temperature

relay

Engine
Tune

up

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Condition
Probable
cause

CANNOT
CRANK

ENGINE
OR

SLOW

CRANKING
Improper
grade
oil

Discharged
battery

Faulty
battery

Loose

fan
belt

Malfunction
in

charge
system

Wiring
connection
loose
in

starting
circuit

Faulty
ignition
switch

Faulty
starler
motor

Trouble

shooting
procedure
on

starting
circuit

Switch
on
the

starting
motor
with

light
ON

When

light
goes
off
or
dims

considerably

a
Check

battery

b
Check
connection
and

cable

c
Check
starter
motor

When

light
stays
bright
Corrective
action

Replace
with

proper
grade
oiL

Charge

battery

Replace

Adjust

Inspect

Correct

Repair
or

replace

Repair
or

replace

a
Check

wiring
connection
between

battery
and
starter

motor

b
Check

ignition
switch

c
Check
starter
motor

ENGINE
WILL
CRANK

NORMALLY
BUT

WILL
NOT

START

In
this
case
the

following
trouble
causes

may
exist

but
in

many
cases

ignition

system
or
fuel

system
is
in

trouble

Ignition

system
in
trouble

Fuel

system
in
troubk

Valve
mechanism
does
not
work

properly

Low

compussion

Trouble

shooting
procedure

Check

spark
plug
firstly
by

following
procedure

Disconnect

high
tension
cable
from
one

spark
plug
and
hold
it

about
10
mm
0
39
in

from
the

engine
metal

part
and
crank

the

engine

Good

spark
occurs

Check

spark
plug

b
Check

ignition
timing

c
Check
fuel

system

d
Check

cylinder
compression

Check
the
current
f10
in

primary
circuit

Very
high
current

Inspect
primary
circuit
for
short

Check
breaker

poiIit
operation

except
tran

sistor

ignition
system
No

spark
occurs

ET

27