ignition DATSUN PICK-UP 1977 Workshop Manual

Engine
Electrical

System

Transistor

ignition
unit

r
1
Power

switching

circuit
Duty

control

circuit

To
starter

To
distributor

Ba

ttery
Ignition
coil
1
Spark
timing

1
Signal
mom

toring
circuit
Lock

j
preven
ling

circuit

nm

Distributor

EE437

Fig
EE
75
Transistor

ignition
unit
circuit

diagram

REMOVAL
AND

INSTALLATION

Transistor

ignition
unit
is

located

on
the

right
hand
dash

side

panel
in

passenger
compartment

Disconnect

battery
negative
cable

2
Disconnect

wiring
harness
from

unit

3
Remove
two

setscrews
and
te

move
unit

4

To
install
reverse
the
order
of

removal

Note
Be

sure
to
connect

wiring
har

nesses
to
their

proper

positio

Failure
to
do
so
will

damage
the

unit

Refer
to

Figure
EE
76

Fig
EE
76
External
view

of

ignition

unit
INSPECTION

If
the

engine
does

not
run
due

to

faulty
ignition
system
check
the

igni

tion

system
as
follows

Check
for
a
cracked
distributor

rotor
or

cap
and
corroded
tenninals

Visually

inspect
high
tension
wires

for

condition
and
if

necessary
use
an

ignition
oscilloscope
or
a
circuit
tester

to
make

performance
checks
Check

spark
plugs
and

adjust
gaps
as
neces

sary

Replace
a

spark
plug
which

is
not

suitable
for
further
use
If
the

above

checks
cannot
correct
the

problem

check
the
entire

ignition
system
with

an

oscilloscope
or

a
circuit

tester

L
CHECKING
WITH
AN

OSCILLOSCOPE

An

oscilloscope
can
be
used
for

checking
almost

all
the
items
in

a

transistor

ignition
system

CHECKING
WITH
A

CIRCUIT

TESTER

A
circuit
tester
can
not
be

used
for

the

duty
control
circuit

and

power

t18nsistor

performance
tests

Both

methods
use
of

an

oscilloscope
and
a

circuit
tester

are
described
in
this

section

EE

37
The
items

are
classified

by
numerals

in

accordance
with
the

objective
of

checks
to

be

performed
Several

wiring

diagrams
are
found

on

pages
EE
41

to

EE
45
The
thick
lines
indicate

the

objective
of

each
individual
item

check

When

checking
a
circuit
with
an

oscilloscope
or
a
circuit
tester
be

careful
not
to

confuse
the

polarity
of

the
lead
wires
if

potential
difference

exists
between
the
check

points
at

which
the
lead
wires
are
to
be
con

tacted

Also
do
not

attempt
to
con

nect
the

lead
wires
to

any
points
in
the

circuit
other

than
those

designated

Careless

handling
of
the
lead
wires

will

result
in

damage
to
the
transistor

ignition
unit

as
well
as
to
the
oscillo

scope
or
circuit

tester

The
connection
of

a
tachometer

or

a

timing
light
in

parallel
with
an

oscilloscope
or
a
circuit
tester
is
al

lowable

provided
that
such
a

connec

tion
is

made
with
due
consideration
to

wiring
connections

1
POWER
SUPPLY

WIRING

AND

BAnERY
CHECK

See

wIrIng
diagram

In

FIgure
EE
88

Procedure

I
Turn
on

ignition
switch

2

Connect

a
circuit
tester
or

an

oscilloscope
as
shown
in
the

figure

below

DC
50
volt

range

EE302

Fig
EE
77

Checking
power
supply

wiring
and

batt

ry

Criterion

When

power
source

battery

voltage
is

indicated
OK

Lower

or
no
indication
N
G

If
the
result

is
N
C
Take

the

following
measures

I
Check
BW
and
B
color

wire

harness

respectively
for

proper
con

ductance

2

Check

battery
terminals

for

proper
connection

3
Check

charge
condition
of
bat

tery
if
an

excessively
low

voltage
is

indicated

2

CONTINUITY
CHECK
OF

PRIMARY
CIRCUIT

2
1

CheckIng
prImary

circuit
See

wiring

diagram

In

Fig
EE
89

Proced
ure

I

Disconnect

L
color
wire

from

ignition
unit

2

Turn
on

ignition
switch

3

C
ooneet
a
cireui
t

tester
or
an

oscilloscope
as
shown
in

Figure
EE
78

DC

50
volt

range

tf
S

EE303

Fig
EE

78
Checking
primary
circuit

Criterion

When

Donnal

power
Source

battery

voltage
is

indicated

OK

Lower

or
no
indication

N

G

If
the

result
is

N
C

Take

the

following
measures

1

Check
BW

and
L
color

wire
Engine
Electrical

System

harness

respectively
for

proper
con

ductance

2

Check
resistor

and

ignition
coil

terminals
for
loose

contact

3

Check
resistor
and

ignition
coil

for

discontinuity

4
Check

WB

color
wire
harness

of

ignition
coil

assembly
for

proper

continuity

2
2

Chacklng
IgnitIon
coil

auembly
See

wiring

diagram
In

Fig
EE
90

Procedure

I

Disconnect

ignition
coil
and
dis

tributor

harness
from

ignition
coil

external
resistor

2

Connect
a
circuit
tester
as

shown

in

the

figure
below

Resistance

1

range

Q

o
fD

ro

EE336

Fig
EE
79

Checking
ignition
coil

assembly

Criterion

When

approximately
1
6

to

2

0

ohm
is

indicated

OK

More

than
2

0
ohm

N
C

If
the

result
is

N
C

Replace

ignition
coil

assembly

3
PICK

UP

COIL

CONTINUITY

CHECK

See

wirIng
dIagram
In

Figure
EE
91

Procedure

Disconnect
R

and
G

color

wires
from

ignition
unit

2
Connect

a
circuit

tester
as
shown

in
the

figure
below

EE

3B
Resistance

10

range

fp

EE305

Fig
EE

BO

Checking
pick
up
coil

Criterion

When

approximately
720
ohm

is

indicated

OK

Far
less
than
or
more

than

720
ohm
N
C

If

the
result
is
N
C

Replace

pick

up
coil

assembly

4

PICK
UP
COIL
POWER

SIGNAL

PULSE
CHECK

Procedure

I

Disconnect
anti

dieseling
solenoid

valve

connector

2

Connect
a
circuit

tester
as

shown

in

the

figure
below

3

Rotate
starter

motor

4

Read
the
tester
indication

AC
2
S
volt

range

EE306

Fig
EE
81

Checking
pick
up
coil

power

aignal
pulse

Criterion

When

pointer
deflects

slightly
OK

When

pointer
does
not
deflect

at
all

N
C

If
the

result
is

N
C

Replace

pick

up
coil

assembly

Procedure
with
an

oscilloscope

1
Disconnect
anti

dieseling
solenoid

valve
connector

2

Connect
a

positive
lead
of
an

oscilloscope
to
R
olor
wire

and
a

negative
lead
of
an

oscilloscope
to

G
color
wire

3
Set
a
SLOPE
select
switch
of

an
oscilloscope
to
the

positive
side
If

so

equipped

4

Rotate
starter
motor

5
Check
the

wave
form
as
shown
in

the

figure
below

EE268

Fig
EE
82
Wave

form
of
pick
up
coil

Criterion

When
the

wave
form
takes

the

shape
of
a

full
line
OK

When
the

wave
form
takes
the

shape
of

a
dashed
line

or
when

there

is
no
wave

form
N

G

If
the
result
is
N
G

Replace

pick
up
coil

assembly

5

TRANSISTOR
IGNITION

UNIT

CHECK
See

wiring

diagram
In

Figure
EE
92

Check
items
5
1
and
5
2
with

an

oscilloscope

Where

an

oscilloscope
is
not
availa

ble
check
to
make
sure
that
all

previ

ous
tests
are

satisfactory
and
that
no

spark
is

issuing
from
the

secondary

high
tension
wire

If

everything
else
is

satisfactory

then
the
transistor

ignition
unit
is

faulty
or
there
is

discontinuity
in
the

secondary

high
tension
wire

Replace

the

faulty
part
After

replacement

check
the

sparks
from
the

secondary

cord

5
1

Checking
operatIon

of
transIstor

Ignition
unit

Procedure

I

Connect

ignition
coil
and
dis

tributor
harness
to

ignition
coil
exter

nal
resistor
Engine
Electrical

System

Oscilloscope

o

EB

80

To

body
metal
Ignition
coil
terminal

8W

r
8

0

C
0

EB

Fig
EE
83

Checking
operation
of
transistor

ignition
unit
EE307

@

@

2

Connect

wiring
harness
to
the

ignition
unit

3
Disconnect
anti

dieseling
solenoid

valve
connector

4

Connect
oscilloscope
as
shown
in

Figure
EE
83

rotate
the
starter
motor

and
observe
the
wave

form
on
the

oscilloscope

Criterion

See

Figure
EE
84

When

a
wave
form
similar
to

a
is
observed
OK

When
a
wave
form
similar
to

b
is

obseIVed

or
when
no
wave
form
is

observed
N

G

If
the
result
is
N
G
the
fault
lies

either
in
the
transistor
unit

or
in
the

secondary
high
tension
wire

Replace
these

parts

EE
39
EE452

Fig
EE
84
W
uve

form
of
pulse

If
an

oscilloscope
is

not
avail

able

Procedure

1
Connect

ignition
coil
and
dis

tributor
harness
to

ignition
coil
exter

nal
resistor

2

Connect

wiring
harness
to

igni

tion
unit

3

Disconnect
anti

dieseling
solenoid

valve

connector

4

Keep
the

secondary
high
tension

wire
end
4
to
5

mm
0
16
to
0
20
in

away
from

engine
block
rotate
the

starter
motor
and
check

whether

sparks
fly
across
the
clearance

Criterion

Where
sparks
issue
OK

Where

no
spark
issues
N

G

If
the
result
is
N
G
the
fault

lies
either
in

the
transistor
unit
or
in

the

secondary
high
tension
wire

Replace
these

paris

5
2

Checking
operation

of

duty

Procedure

Connect
anti

dieseling
solenoid

valve

connector

2

While
the

engine
is

idling
observe

the
wave

ronn
on

the

oscilloscope
in

the

same

way
as
stated
in
item
5

Figure
EE
83
Determine
the
ratio

tiT

as
shown
in

Figure
EE
85

I

T
x

100

20
to

401
1

at

idling

h

Lt
1

T

EE257

Fig
EE

85
Wove

form
ofduty
pulse

Criterion

When

a
standard
ratio
of

about

20

to

40
is

obtaiiied

OK

When
the

ratio
obtained

is

less
than
20

or

more
than
40

N

G

If

the
result
is
N

G

transistor

ignition
unit
Replace

5
3

Checking
lock

preventive
circuit

If
a
circuit
tester

is
used

Procedure

1

Connect
a
circuit

tester
as
shown

in

Figure
EE
83

or

EE
86

positive

terminal
of

tester
is
connected
to
L

color
wire
and

negative
terminal
of

tester
is

grounded

2
Turn
on

ignition
switch

Check
to

see
whether
the
tester
indicates

the

vol

age
of

power
source
ba

t1ery

as
soon
as

ignition
switch
is

turned

on
Engine
Electrical

System

DC

50
volt

range

rC

o

8

Criterion

When

power
source

voltage

is
indicated

When

approximately

is

indicated
OK

zero

voltage

N
G

If

the
result
is
N
G

Take
the

following
measures

Replace
transistor

ignition
unit

If
an

oscilloScope
is
uSetl

Procedure

I
When

using
an

oscilloscope
in

stead
of

a
tester

arrange
the

connec

Oy

EE
40
B
fJ

BW
O

L

t
1

V
Transi
tor

ignition
unit

EE357

Fig
EE
86

Checking
lock

p
uentive
circuit

tion
in

the

same

way
as
shown
in

Figure
EE
83
or

Figure
EE
86

Turn

on

ignition
switch

Check
to

see
whether
the

wave

form
on
the

oscilloscope
rises

up
to

the

power
source

voltage
within

about

10
seconds
after

ignition
switch
is

turned
on

Criterion

The
same

as
described
before

for

use
of
a
tester

Power
source

voltage

t

Ignition
switch
ON

EE430

Fig
EE
87
Wave

form
of
lock

preventive
circuit

It
nitionS
l
tC

1
1
1
1
BR

o
IgnitiOn
coil
auemblY

i
stn
Utot
r

Terminal
b
oC
II
o

llW
Power
switching

dtCuit

L
R
G
sparlt
timing

sign
1
l
lonltoriOi

circui
t
Duty
control

circuit
rn
5
l1
l1
n

Harne
s
c
am
P
oClt
preventing

cllcuit
1
A
l1
3

19nition
unit
E
E438

1
r
and
batte
c
c

Fill
EE
88
Wiring
di
l8
ram
for
item
l
PO
er
uPP
y
I

W
b
IlR

o
ignition
coil
assemblY

DistributO
r

Terminal
b
OC
k
Il
IlW
L
R
G
o

Harness
c
alnP
Spade
tiR
lng

oIgn
1
monitoring

cltCuit
Loc
K
Iteventins

circuit
powet
switcnlOS

cucuil
DUtY
conno

circuit
rn
l

lO
3

D
W
C
l
0
c

o
f
3

19
nit
on
unit
eE
439

w
0

b
gn1t10
O
sWitch
llR

o
19t
iUO
P
coll
auefC
uW

tri
Dutot
r

let11
ina
o
OC
B
ll
ll
L
R
G
@
o

H
a
rnesS
clarnp
S1
atK
tunin

sign
a
tnoo
t
oth1

citcuit
lflc
K
ptellenunt

cirCuit
rowel
sVI
tdl
ing

citCuit
putY
contto

ciIcuit
rn
l
0
r
W
o
O
l
Il
S
3

Ignition
unit
EeA40

R
1
ncoi1
blY

Fig
EE
90
Wirinll
dioS
for
ite
2
2
CMC
nll
i
Iln1
0

The

ignition
coil
is

an
oil
f1l1ed

type
The

ignition
coil
case

is
filled

with
oil
which
has

good

insulating
and

heat

radiating
characteristics

The

ignition
coil
has
a

greater
ratio

between
the

primary
and

secondary

windings
to

step
up
battery
voltage
t

high
voltage
This
causes

stronger

sparks
to

jump
the

spark
plug

gap

The

cap
is
made
of

alkyd
resin

which
offers

high
resistance
to
lectric

arc
and
increased
insulation

The

ignition
coil
and
resistor
should

be
handled

as
a
matched
set

When

high
tension
wire
is

installed

to

ignition
coil
there
should
be

no

clearance
between
their

caps

I
EE354

1

High
tension
wire

2
Rubber

cap

Fig
EE

94
Correcl
installation

of

high

t
Mjon

win

SPECIFICATIONS

Type

Primary
voltage

Spark
gap

Primary
resistance
at
200C
680F

Secondary
resistance

at
200C
680
F
KSl

External

resistor
at20
C

680F
n
Engine
Electrical

System

IGNITION
COIL

California
models

f
ID

@

J

C

ID

I
1W

1
R

bber

cap
for

ignition
coil

2

Secondary
terminal

3

Cap

4

Primary
terminal

5

Spring

6

Secondary
winding

7

Primary
winding

Notes

a
Do

not
disconnect

high
tension

wires
from

spark
plugs
during
en

gine

mnning
California

models

only

b

RoD

up
high
tension

wire
mbber

cap
and
instaD

high
tension
wire
to

ignition
coil

securely
Refer
to

Figure
EE
9S
Non
califomia

models

EE314

8
Side
core

9
Insulator
coil

10
Center
core

11

Segment

12
Case

13
Rubber

cap
Cor
terminal

Fig
EE
93
Sectional
view

of

ignition
coil

Fig
EE

95

Installing
high
tension
wire

Non

California

California
models

models

C6R
618

HS
15
18
CIT

16
STC
9

12
12

more
than
7

0
28
more
than
7

0
28

1
08
to
1
32
0
45
to

0
55

8
24
to

12
4
8
5
to

12
7

1
5
1
3

0
4
0

9
V

mm
in

n

EE
46

DESCRIPTION

INSPECTION

CLEANING
AND
REGAP

DESCRIPTION

The

spark
plugs
are
of
the

conven

tional

type
having
14
mm
0

551
in

threads
The

spark
plug
gaps
are
1
0
to

1
1
mm
0
039
to
0
043
in
on
Cali

fomia
models
and
0
8

to
0
9
mm

0
031
to

0
035
in
on
non
California

models
The

inspection
and

cleaning

should
be
made
every
suitable
mainte

nance

period
If
necessary
replace

Note
All

spark

plugs
installed
on
an

engine
must
be

of
the
same
brand

and
the

same
number
of
heat

range

INSPECTION

L
Remove

spark
plug
wire

by

pulling
on

boot
not
on
wire
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

Figure

EE
96

Normal
Brown
to

grayish
tan
de

posits
and

slight
electrode
wear

indicate
correct

spark
plug
heat

range

Carbon
fouled

Dry
fluffy
carbon

deposits
on
the
insulator
and

electrode
are

usually
caused

by

slow
speed
driving
in

city
weak

ignition
too
rich
fuel
mixture

dirty
air
cleaner
etc

It
is

advisable
to

replace
with

plugs

having
hotter
heat

range

Oil
fouled
Wet
black

deposits
indi

cate
excessive
oil
entrance
into

combustion
chamber

through
worn

rings
and

pistons
or
excessive
clear

ance
between
valve

guides
and

stems
If
the
same
condition
re

mains
after

repair
use
a
hotter

plug
Engine
Electrical

System

SPARK
PLUG

CONTENTS

EE
4B

EE
47

EE
47

EE
47
SERVICE
DATA
AND
SPECIFICATIONS

TROUBLE
DIAGNOSES
AND

CORRECTIONS
EE
4B

Overheating
White
or

light

gray
in

sulator
with
black
or

gray
brown

spots
and
bluish
burnt
electrodes

indicate

engine
overheating
More

over
the

appearance
results
from

incorrect

ignition
timing
loose

Normal

Overheating

EE079

4
After
cleaning
dress
electrodes

with
a
smaU
fine
file
to
flatten
the

surfaces
of
both
center
and
side

electwdes
in

parallel
Set

spark
plug

gap
to

specification

5
InstaU

spark
plugs
and

torque

each

plug
to
L5

to
2
0

kg
m

11
to
14

ft
Ib

6
Connect

spark

plug
wires

CLEANING

AND
REGAP

Clean

spark
plugs
in

a
sand
blast

type
cleaner
Avoid
excessive

blasting

Clean
and
remove
carbon
or
oxide

deposits
but
do
not

wear
away

porcelain
If

deposits
are
too
stubborn

EE
47
spark
plugs
low
fuel

pump
pres

sure

wrong
selection
of
fuel
a

hotter

plug
etc

It
is
advisable
to

replace
with

plugs

having
colder
heat

range

Ir

i

Carbon
fould

Worn

Fig
EE
96

Spark
plug

discard

plugs

After

cleaning
spark
plugs
renew

firing
surface
of
electrodes
with
me

mentioned
aboVe
Then

gap
spark

plugs
to

specified
values
with
a
round

wire
feeler

gauge
All

spark
plugs
new

or
used
should
have
the

gap
checked

and
reset

by
bending
ground
electrode

EEOBO

Fig
EE
97

Setting
park
plug
gap

Engine
Electrical

System

SERVICE
DATA
AND
SPECIFICATIONS

California

models
Non

California

models

For
Canada

except
for

Canada

BP6ES
ll
BP6ES

BPR6ES
Standard

L45PW
ll
L45PW

BP4E
ll
BP5ES
ll
BP4E

BP5ES
BPR4ES

Type
Hot

type

L46PW
ll

L47PW
ll

L46PW
L47PW
BPR5ES

Cold

type
BP7ES
ll

BP7ES

BPR7ES

LMPW
ll
LMPW

1
0
to
l
l
0
8
to
0

9
0
8
to
0
9

Plug

gap
mm

in

0

039
to
0
043
0

031
to
0
D35
0
031
to
0

035

Tightening
torque
kg
m
ft
Ib

I
1
5
to
2

0
11
to
14

TROUBLE

DIAGNOSES

AND

CORRECTIONS

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
wire

from
spark

plug
starting

engine
and

ob

serving
condition
of

spark
that

occurs

between

high
tension

wire
and

spark

plug
terminal

After

checking
this

repair
as

necessary
Note
On
California
models

disc
on

nect
anti

dieseling
solenoid

valve

connector
to

cut
off

supply
of
fuel

to

engine
and

then
observe

the

condition

of

spaIks
while
starter

motor
is

in

operation

Condition
Location

Probable

cause
Corrective
action

No

spark
at
all

Distributor

Faulty
insulation
of
condenser

Non
Cali

Replace

fomia

models

Breakage
of
lead
wire
on
low
tension
side

Repair

Poor
insulation
of

cap
and
rotor
head

Replace

Seized

points
Non
California

models

Repair

Open
pick
up
coil
California
models

Replace

Air

gap
wider
than

specification
Cali

Adjust

fornia

models

Ignition
coil

Wire

breakage
or
short
circuit

of
coil

Replace
with
new
one

High
tension
wire

Wire

coming
off

Repair

Faulty
insulation

Replace

Transistor

ignition
Faulty
transistor

ignition
unit

Replace

unit

California

models

EE
4B