Yamaha XV1700P, XV1700PC. Service Manual - part 29

7 - 12

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ELEC

CHECKING THE BULBS AND BULB SOCKETS

EAS00732

CHECKING THE BULBS AND 
BULB SOCKETS

Check each bulb and bulb socket for damage
or wear, proper connections, and also for con-
tinuity between the terminals. 

Damage/wear 

→

 Repair or replace the

bulb, bulb socket or both. 
Improperly connected 

→

 Properly connect. 

No continuity 

→

 Repair or replace the bulb,

bulb socket or both.

TYPES OF BULBS

The bulbs used on this motorcycle are shown
in the illustration on the left. 

• Bulbs 

A

 and 

B

 are used for the headlights

and usually use a bulb holder that must be
detached before removing the bulb. The
majority of these types of bulbs can be
removed from their respective socket by
turning them counterclockwise. 

• Bulbs 

C

 is used for turn signal and tail/

brake lights and can be removed from the
socket by pushing and turning the bulb
counterclockwise. 

• Bulbs 

D

 and 

E

 are used for meter and indi-

cator lights and can be removed from their
respective socket by carefully pulling them
out.

CHECKING THE CONDITION OF THE 
BULBS

The following procedure applies to all of the
bulbs. 
1. Remove: 

• bulb

7 - 13

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+

ELEC

CHECKING THE BULBS AND BULB SOCKETS

WARNING

_ 

Since the headlight bulb gets extremely
hot, keep flammable products and your
hands away from the bulb until it has
cooled down. 

CAUTION:

_ 

• Be sure to hold the socket firmly when

removing the bulb. Never pull the lead,
otherwise it may be pulled out of the ter-
minal in the coupler. 

• Avoid touching the glass part of the head-

light bulb to keep it free from oil, other-
wise the transparency of the glass, the
life of the bulb, and the luminous flux will
be adversely affected. If the headlight
bulb gets soiled, thoroughly clean it with
a cloth moistened with alcohol or lacquer
thinner. 

2. Check: 

• bulb (for continuity) 

(with the pocket tester) 
No continuity 

→

 Replace.

NOTE:

_ 

Before checking for continuity, set the pocket
tester to “0” and to the “

Ω

 

×

 1” range. 

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a. Connect the positive tester probe to termi-

nal 

1

 and the negative tester probe to ter-

minal 

2

, and check the continuity. 

b. Connect the positive tester probe to termi-

nal 

1

 and the negative tester probe to ter-

minal 

3

, and check the continuity. 

c. If either of the readings indicate no continu-

ity, replace the bulb. 

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▲

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▲

▲ ▲▲▲

▲

▲ ▲▲▲

▲

▲▲▲

Pocket tester 

YU-03112

7 - 14

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+

ELEC

CHECKING THE BULBS AND BULB SOCKETS

CHECKING THE CONDITION OF THE BULB 
SOCKETS

The following procedure applies to all of the
bulb sockets. 
1. Check: 

• bulb socket (for continuity) 

(with the pocket tester) 
No continuity 

→

 Replace.

NOTE:

_ 

Check each bulb socket for continuity in the
same manner as described in the bulb section;
however, note the following. 

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a. Install a good bulb into the bulb socket. 
b. Connect the pocket tester probes to the

respective leads of the bulb socket. 

c. Check the bulb socket for continuity. If any

of the readings indicate no continuity,
replace the bulb socket. 

▲▲▲

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▲ ▲▲▲

▲

▲ ▲▲▲

▲

▲ ▲▲▲

▲

▲ ▲▲▲

▲

▲ ▲▲▲

▲

▲▲▲

Pocket tester 

YU-03112

7 - 15

–

+

ELEC

CHECKING THE BULBS AND BULB SOCKETS

CHECKING THE LEDs

The following procedures applies to all of the
LEDs. 
1. Check: 

• LED (for proper operation) 

Improper operation 

→

 Replace.

▼▼▼

▼

▼ ▼▼▼

▼

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▼

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▼

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▼

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▼

▼▼▼

a. Disconnect the speedometer assembly cou-

pler (speedometer assembly side). 

b. Connect two jumper leads 

1

 from the bat-

tery terminals to the respective coupler ter-
minal as shown.

WARNING

_ 

• A wire that is used as a jumper lead must

have at least the same capacity of the bat-
tery lead, otherwise the jumper lead may
burn. 

• This check is likely to produce sparks,

therefore, make sure no flammable gas or
fluid is in the vicinity. 

c. When the jumper leads are connected to

the terminals the respective LED should illu-
minate. 
Does not light 

→

 Replace the speedometer

assembly. 

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▲

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▲

▲ ▲▲▲

▲

▲ ▲▲▲

▲

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Ch Y

Br

Dg Lg

B

Ch Y

Dg Lg

B

Br

1

1

7 - 16

–

+

ELEC

IGNITION SYSTEM

EAS00735

IGNITION SYSTEM

CIRCUIT DIAGRAM

B3

B3

R

/

B

L

/

R

R

/

L

R

/

W

(BLACK)

(GRAY)

W

W

W

R

B

B

W

W

W

W

W

W

B

/

W

Br

/

Y

P

/

W

R

/

W

W

/

B

W

/

Y

Y

/

L

B

/

L

Y

/

G

Y

/

G

G

P

R

O

B

P

Br

Y

R

/

G

R

/

GG

G

G

G

/

RB

/

L

G

W

L

B

L

W

/

Y

B

/

L

P

P

/

W

L

B

/

L

(BLA

CK)

B
Y
L

(BLA

CK)

L

B

/

L

P

/

Y

(GRA

Y)

L

B

/

L

(BLA

CK)

L

Y

/

G

L

B

/

L

P

/

W

P

/

Y

B

/

L

Br

/

W

L

P

B

Y

L

B

/

L

L

B

/

L

W

G

/

R

B

/

L

Gy

/

R

WG

(GRA

Y)

W

Gy

(D

ARK GRA

Y)

(BLA

CK)

(BLA

CK)

B

/

O

B

/

R

B

/

R

G

/

R

R

/

G

Y

/

G

B

/

L

P

/

L

Y

/

L

Y

/

B

Gy

Gy

G

L

/

R

Lg

Y

/

R

R

/

L

R

/

W

R

/

W

Y

W

/

Y

W

/

G

R

/

B

P

Br

P

/

Y

P

/

W

Br

/

W

Br

/

L

B

/

RB

/

W

B

/

Y

B

/

O

B

/

G

Y

/

RL

/

W

W

/

B

W

L

L

/

B

B3

B3

(BLA

CK)

L

/

G

L

/

R

L

/

G

B

/

Y

B

/

R

B

(BLUE)

Br

/

B

R

/

L

L

/

W1

L

/

R

L

/

Y

L

/

G

Sb

Lg

B

/

R

B

/

Y

L

R

/

L

B

B
B

B

B

L

/

G

B

(BLUE)

B

/

L

Gy

B

B

Gy

B

L

/

Y

R

/

L

Br

/

B

Gy

B

/

L

Sb

Lg

Sb

L

B

/

L

W

/

Y

L

B

/

L

W

/

B

Br

/

W

Br

/

W

Br

/

L

Br

/

L

Br

/

L

B

B

W

L

(BLA

CK)

(BLA

CK)

(BLA

CK)

(BLA

CK)

(BLA

CK)

(BLA

CK)

W

B

Br

B

W

L

B

L

W

/

B

B

/

L

Y

L

B

L

Y

B

P

/

Y

Gy

Br

Br

G

Gy

Lg

Lg

W

B

/

L

B

/

O

(RED)

(RED)

(BLUE)

(BLUE)

Y

/

L

B

L

Br

L

Br

Y

/

L

B

Gy

/

R

Lg

BB

Br

/

Y

O

P

R

P

R

Br

/

Y

O

Gy

L

/

R

B

/

L

L

/

R

B

/

L

G

/

R

Gy

G

/

R

(GREEN)

(GREEN)

B

B

Lg

Lg

Dg

Dg

Br

Br

Y

Y

Ch

Ch

(RED)

(BLUE)

P

R

Br

/

Y

O

Gy

L

/

R

B

/

LG

/

R

Gy

Gy

Br

G

/

R

L

/

R

Br

/

Y

B

/

L

P

R

Y

O

G

/

R

L

/

R

G

G

G

Gy

Gy

Gy

W

W

W

W

W

R

/

B

R

/

B

R

/

G

P

/

L

W

/

G

Br

/

L

R

R

/

G

R

B

B

B

R

R

R

R

R

B

B

R

/

W

R

/

B

R

/

W

RR

L

B

Br

WY

/

R

Br

/

W

B

B

ON

OFF

R

/

B

R

Br

/

L

L

/

B

L

/

Y

R

R

/

B

R

/

B

Gy

/

R

R

Br

/

B

(BLACK)

Y

Br

(BLACK)

B

B

(BLACK)

B

/

GL

/

W1

B

/

R

R

/

W

Y

Br

(BLACK)

R

/

W

B

L

/

W

R

/

B

G

/

Y

Br

(BLACK)

L

/

Y

B

/

YB

/

Y

Ch

Dg

G

Y

(BLUE)

L

/

Y

Ch

Dg

G

Y

(BLUE)

A

A

L

L

L

L

Y

A

B

B

Y

Y

Y

A

Ch

Ch

A

B

B

A

B

B

B

B

Dg

Dg

Dg

Y

Ch

B

B

B

B

G

G

B

Y

R

/

Y

G

/

L

Y

/

B

R

/

Y

Br

W

B

/

W

P

B

B

/

G

B

/

R

R

/

Y

R

/

W

B

/

G

L

/

W1

B

/

R

R

/

W

B

/

YL

/

Y

B

/

Y

B

/

L

P

B

Y

G

B

Ch

Dg

B

/

Y

G

/

L

Y

/

B

Y

/

R

Y

/

R

R

/

Y

R

/

Y

Br

/

W

Br

/

W

L

/

Y

Y

/

R

G

/

L

P

Br

/

W

B

R

/

Y

Y

/

R

P

Br

/

W

B

Lg

Br

Ch

Dg

L

/

B

L

/

W

Y

/

B

G

/

R

Y

/

L

Y

/

R

B

/

W

R

/

G

P

/

L

W

/

G

Br

/

L

R

/

G

P

/

L

W

/

G

Br

/

L

R

/

B

R

/

B

L

/

W1

L

B

/

L

B

/

L

L

B

R

Br

Br

L

L

Dg

Ch

B

B

B

B

B

B

L

Br

R

/

G

G

L

9

0

A

(L)

N (R)

Y

Ch

LB

Dg

Ch

Y

L

B

Dg

12

3

4

5

6

7

F

E

B

C

D

L

G

H

I

J

K

M

N

O

P

Q

R

R

S

S

T

U

V

W

Z

X

Y

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]

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8

A

WIREHARNESS

TAIL SUB-WIREHARNESS

B

B

R

/

L

G

R

L

/

B

Br

/

L

L

/

Y

R

L

/

B

Br

/

L

L

/

Y

(BLACK)

W

G

W

G

/

Y

W

G

/

Y

W

G

(BLACK)

(BLACK)

Br

P

B

WIREHARNESS

INJECTION SUB-WIREHARNESS

3

Main switc

h

 

4

Battery 

6

Main fuse 

9

Re

lay unit

 

C

N

e

utral s

witc

h

 

D

Sidest

a

n

d

 swit

ch

 

E

Cr

an

ksh

a

ft

 po

sit

io

n

 se

nsor

K

Lea

n an

gle cut

-o

ff swit

ch

P

EC

U 

R

Ig

nit

ion

 coil

S

Spar

k p

lug

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En

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ine

 st

op

 s

witch

{

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nit

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 f

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se 

7 - 17

–

+

ELEC

IGNITION SYSTEM

EAS00737

TROUBLESHOOTING

Check: 
1. main and ignition fuses 
2. battery 
3. spark plugs 
4. ignition spark gap 
5. spark plug cap resistance 
6. ignition coil resistance 
7. crankshaft position sensor resistance
8. main switch 
9. engine stop switch 
10.neutral switch 
11.sidestand switch 
12.lean angle cut-off switch voltage
13.relay unit (diode)
14.wiring connections 

(of the entire ignition system)

NOTE:

_ 

• Before troubleshooting, remove the following

part(s): 

1. seat
2. fuel tank
3. silencer air filter case
4. side covers
5. ignition coils
6. headlight lens unit
7. horn 2
• Troubleshoot with the following special

tool(s). 

EAS00738

YES

NO

EAS00739

YES

NO

EAS00741

The ignition system fails to operate (no
spark or intermittent spark).

Dynamic spark tester 

YM-34487

Pocket tester 

YU-03112

1. Main and ignition fuses 

• Check the main and ignition fuses for con-

tinuity. 
Refer to “CHECKING THE FUSES” in
chapter 3. 

• Are the main and ignition fuses OK?

Replace the fuse(s).

2. Battery 

• Check the condition of the battery. 

Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3.

Minimum open-circuit voltage 

12.8 V or more at 20 °C (68 °F)

• Is the battery OK?

• Clean the battery

terminals. 

• Recharge or

replace the battery.

3. Spark plugs 

The following procedure applies to all of the
spark plugs. 

• Check the condition of the spark plug. 
• Check the spark plug type. 
• Measure the spark plug gap. 

Refer to “CHECKING THE SPARK
PLUGS” in chapter 3.

Standard spark plug 

DPR7EA-9 (NGK) 
X22EPR-U9 (DENSO) 

Spark plug gap 

0.8 ~ 0.9 mm (0.0315 ~ 0.0354 in)

7 - 18

–

+

ELEC

IGNITION SYSTEM

YES

NO

EAS00743

YES

NO

EAS00745

YES

NO

• Is the spark plug in good condition, is it of

the correct type, and is its gap within spec-
ification?

Re-gap or replace
the spark plug.

4. Ignition spark gap 

The following procedure applies to all of the
spark plugs. 

• Disconnect the spark plug cap from the

spark plug. 

• Connect the ignition checker 

1

 as shown. 

2

Spark plug cap 

• Set the main switch to “ON”. 
• Measure the ignition spark gap 

a

. 

• Crank the engine by pushing the starter

switch and gradually increase the spark
gap until a misfire occurs.

Minimum ignition spark gap 

6 mm (0.24 in)

• Is there a spark and is the spark gap within

specification?

The ignition system
is OK.

5. Spark plug cap resistance 

The following procedure applies to all of the
spark plug caps. 

• Remove the spark plug cap from the spark

plug lead. 

• Connect the pocket tester (”

Ω

 

×

 1k”) to the

spark plug cap as shown. 

• Measure the spark plug cap resistance.

Spark plug cap resistance 

10 k

Ω

 at 20 °C (68 °F)

• Is the spark plug cap OK?

Replace the spark
plug cap.

7 - 19

–

+

ELEC

IGNITION SYSTEM

EAS00747

YES

NO

EAS00748

YES

NO

6. Ignition coil resistance 

The following procedure applies to all of the
ignition coils. 

• Disconnect the ignition coil leads from the

wire harness. 

• Connect the pocket tester (

Ω

 

×

 1) to the

ignition coil as shown.

Positive tester probe 

→

 black/red 

Negative tester probe 

→

 

black/orange (black/white)

• Measure the primary coil resistance.

Primary coil resistance 

1.31 ~ 1.79 

Ω

 at 20 °C (68 °F)

• Connect the pocket tester (

Ω

 

×

 1k) to the

ignition coil as shown.

Negative tester probe 

→

 spark plug lead 

1

Positive tester probe 

→

 spark plug lead 

2

• Measure the secondary coil resistance.

Secondary coil resistance 

12 ~ 18 k

Ω

 at 20 °C (68 °F)

• Is the ignition coil OK?

Replace the ignition
coil.

7. Crankshaft position sensor resistance 

• Disconnect the crankshaft position sensor

coupler from the wire harness. 

• Connect the pocket tester (

Ω

 

×

 100) to the

crankshaft position sensor coupler as
shown.

Positive tester probe 

→

 gray 

1

 

Negative tester probe 

→

 black 

2

• Measure the crankshaft position sensor

resistance.

Crankshaft position sensor 
resistance 

248.0 ~ 372.0 

Ω

 at 20 °C (68 °F) 

(between gray and black)

• Is the crankshaft position sensor OK?

Replace the crank-
shaft position sensor.

7 - 20

–

+

ELEC

IGNITION SYSTEM

EAS00749

YES

NO

EAS00750

YES

NO

EAS00751

YES

NO

EAS00752

YES

NO

YES

NO

8. Main switch 

• Check the main switch for continuity. 

Refer to “CHECKING THE SWITCHES”. 

• Is the main switch OK?

Replace the main
switch.

9. Engine stop switch 

• Check the engine stop switch for continu-

ity. 
Refer to “CHECKING THE SWITCHES”. 

• Is the engine stop switch OK?

Replace the right
handlebar switch.

10.Neutral switch 

• Check the neutral switch for continuity. 

Refer to “CHECKING THE SWITCHES”. 

• Is the neutral switch OK?

Replace the neutral
switch.

11.Sidestand switch 

• Check the sidestand switch for continuity. 

Refer to “CHECKING THE SWITCHES”. 

• Is the sidestand switch OK?

Replace the side-
stand switch.

12.Lean angle cut-off switch voltage

• Remove the lean angle cut-off switch. 
• Connect the pocket tester (

Ω

 

×

 1) to the

lean angle cut-off switch terminals as
shown. 

Positive tester probe 

→

 blue 

Negative tester probe 

→

 yellow/green 

Lean angle cut-off switch voltage 

Less than 65° 

a

 

→

 

Approximately 1 V

More than 65° 

b

 

→

 

Approximately 4 V

• Is the lean angle cut-off switch OK?

Replace the lean 
angle cut-off switch.

−

+

ON

ON

a

a

b

7 - 21

–

+

ELEC

IGNITION SYSTEM

EAS00760

YES

NO

EAS00754

YES

NO

13.Relay unit (diode)

• Remove the relay unit from the wire har-

ness. 

• Connect the pocket tester (

Ω

 

×

 1) to the

relay unit terminals as shown. 

• Measure the diode for continuity as fol-

lows.

Positive tester probe 

→

 

sky blue 

1

Negative tester probe 

→

 

blue/yellow 

2

Continuity

Positive tester probe 

→

 

blue/green 

3

Negative tester probe 

→

 

blue/yellow 

2

Positive tester probe 

→

 

blue/yellow 

2

Negative tester probe 

→

 

sky blue 

1

No continuity

Positive tester probe 

→

 

blue/yellow 

2

Negative tester probe 

→

 

blue/green 

3

NOTE:

_ 

When you switch the tester’s positive and
negative probes, the readings in the above
chart will be reversed. 

• Are the testing readings correct?

Replace the starting
circuit cut-off relay.

L

/

G L

/

Y Sb B

/

Y Lg

B

/

R L

/

W

L

/

R

R

/

L

Br

/

B L

3 2 1

14.Wiring 

• Check the entire ignition system’s wiring. 

Refer to “CIRCUIT DIAGRAM”. 

• Is the ignition system’s wiring properly

connected and without defects?

Replace the ECU.

Properly  connect  or
repair the ignition
system’s wiring.

7 - 22

–

+

ELEC

ELECTRIC STARTING SYSTEM

EAS00755

ELECTRIC STARTING SYSTEM

CIRCUIT DIAGRAM

B3

B3

R

/

B

L

/

R

R

/

L

R

/

W

(BLACK)

(GRAY)

W

W

W

R

B

B

W

W

W

W

W

W

B

/

W

P

/

W

R

/

W

W

/

B

W

/

Y

Y

/

G

Y

/

G

G

P

Br

Y

G

G

/

RB

/

L

G

W

L

B

L

W

/

Y

B

/

L

P

P

/

W

L

B

/

L

(BLA

CK)

B
Y
L

(BLA

CK)

L

B

/

L

P

/

Y

(GRA

Y)

L

B

/

L

(BLA

CK)

L

Y

/

G

L

B

/

L

P

/

W

P

/

Y

B

/

L

Br

/

W

L

P

B

Y

L

B

/

L

L

B

/

L

B

/

L

W

G

/

R

B

/

L

Gy

/

R

WG

(GRA

Y)

W

Gy

(D

ARK GRA

Y)

(BLA

CK)

(BLA

CK)

B

/

O

B

/

R

B

/

R

G

/

R

R

/

G

Y

/

G

B

/

L

P

/

L

Y

/

L

Y

/

B

Gy

Gy

G

L

/

R

Lg

Y

/

R

R

/

L

R

/

W

R

/

W

Y

W

/

Y

W

/

G

R

/

B

P

Br

P

/

Y

P

/

W

Br

/

W

Br

/

L

B

/

RB

/

W

B

/

Y

B

/

O

B

/

G

Y

/

RL

/

W

W

/

B

W

L

L

/

B

B3

B3

(BLA

CK)

L

/

G

L

/

R

L

/

G

B

/

Y

B

/

R

B

(BLUE)

Br

/

B

R

/

L

L

/

W1

L

/

R

L

/

Y

L

/

G

Sb

Lg

B

/

R

B

/

Y

L

R

/

L

B

B
B

B

B

L

/

G

B

(BLUE)

B

/

L

Gy

B

B

Gy

B

L

/

Y

R

/

L

Br

/

B

Gy

B

/

L

Sb

Lg

Sb

L

B

/

L

W

/

Y

L

W

/

B

Br

/

W

Br

/

W

Br

/

L

Br

/

L

Br

/

L

B

B

W

L

(BLA

CK)

(BLA

CK)

(BLA

CK)

(BLA

CK)

(BLA

CK)

(BLA

CK)

W

B

Br

B

W

L

B

L

W

/

B

B

/

L

Y

L

B

L

Y

B

P

/

Y

Gy

Br

Br

G

Gy

Lg

Lg

W

B

/

L

B

/

O

Gy

/

R

Lg

BB

(GREEN)

(GREEN)

B

B

Lg

Lg

Dg

Dg

Br

Br

Y

Y

Ch

Ch

(RED)

(BLUE)

P

R

Br

/

Y

O

Gy

L

/

R

B

/

LG

/

R

Gy

Br

/

Y

B

/

L

P

R

Y

O

G

/

R

L

/

R

G

G

G

Gy

Gy

Gy

W

W

W

W

W

R

/

B

R

/

B

R

/

G

P

/

L

W

/

G

Br

/

L

R

R

/

G

R

B

B

B

R

R

R

R

R

B

B

R

/

W

R

/

B

R

/

W

RR

L

B

Br

WY

/

R

Br

/

W

B

B

ON

OFF

R

/

B

R

Br

/

L

L

/

B

L

/

Y

R

R

/

B

R

/

B

Gy

/

R

R

Br

/

B

(BLACK)

Y

Br

(BLACK)

B

B

(BLACK)

B

/

GL

/

W1

B

/

R

R

/

W

Y

Br

(BLACK)

L

/

Y

B

/

YB

/

Y

Ch

Dg

G

Y

(BLUE)

L

/

Y

Ch

Dg

G

Y

(BLUE)

A

A

L

L

L

L

Y

A

B

B

Y

Y

Y

A

Ch

Ch

A

B

B

A

B

B

B

B

Dg

Dg

Dg

Y

Ch

B

B

B

B

G

G

B

Y

R

/

Y

G

/

L

Y

/

B

R

/

Y

Br

W

B

/

W

P

B

B

/

G

B

/

R

R

/

Y

R

/

W

B

/

G

L

/

W1

B

/

R

R

/

W

B

/

YL

/

Y

B

/

Y

B

/

L

P

B

Y

G

B

Ch

Dg

B

/

Y

G

/

L

Y

/

B

Y

/

R

Y

/

R

R

/

Y

R

/

Y

Br

/

W

Br

/

W

L

/

Y

Y

/

R

G

/

L

P

Br

/

W

B

R

/

Y

Y

/

R

P

Br

/

W

B

Lg

Br

Ch

Dg

L

/

B

L

/

W

Y

/

B

G

/

R

Y

/

L

Y

/

R

B

/

W

R

/

G

P

/

L

W

/

G

Br

/

L

R

/

G

P

/

L

W

/

G

Br

/

L

R

/

B

R

/

B

L

/

W1

L

B

/

L

B

/

L

L

B

R

Br

Br

L

L

Dg

Ch

B

B

B

B

B

B

L

Br

9

0

A

(L)

N (R)

Y

Ch

LB

Dg

Ch

Y

L

B

Dg

12

3

4

5

6

7

F

E

B

C

D

L

G

H

I

J

K

M

N

O

P

Q

R

R

S

S

T

U

V

Z

[

\

]

^

a

b

c

d

e

f

g

h

i

j

k

l

q

m

n

o

p

r

s

t

u

v

w

y

x

z

{

|

}

~

å

8

A

WIREHARNESS

TAIL SUB-WIREHARNESS

B

B

R

/

L

G

R

L

/

B

Br

/

L

L

/

Y

R

L

/

B

Br

/

L

L

/

Y

(BLACK)

W

G

W

G

/

Y

W

G

/

Y

W

G

(BLACK)

(BLACK)

Br

P

B

WIREHARNESS

INJECTION SUB-WIREHARNESS

R

/

W

B

L

/

W

R

/

B

G

/

Y

Br

(BLACK)

3

Main s

witc

h

 

4

Ba

tte

ry

 

6

Ma

in fu

se

 

7

Starter relay 

8

St

ar

te

r m

o

to

r 

9

Relay unit

0

St

ar

tin

g

 c

ircu

it 

cu

t-o

ff

 re

la

y 

C

Neutral s

witch 

D

Side

st

an

d swit

ch 

P

ECU

T

Decompres

s

ion s

o

lenoid 

j

Clutc

h s

witc

h

 

u

Engine st

op sw

itch 

v

Start s

witch

{

Ignit

ion

 fu

se

 

}

Decompres

s

ion s

o

lenoid 

fuse 

7 - 23

–

+

ELEC

ELECTRIC STARTING SYSTEM

EAS00756

STARTING CIRCUIT CUT-OFF SYSTEM 
OPERATION

If the engine stop switch is set to “

” and the

main switch is set to “ON” (both switches are
closed), the starter motor can only operate if at
least one of the following conditions is met: 

• The transmission is in neutral (the neutral

switch is closed). 

• The clutch lever is pulled to the handlebar

(the clutch switch is closed) and the side-
stand is up (the sidestand switch is closed).

The starting circuit cut-off relay prevents the
starter motor from operating when neither of
these conditions has been met. In this
instance, the starting circuit cut-off relay is
open so current cannot reach the starter
motor. When at least one of the above condi-
tions has been met the starting circuit cut-off
relay is closed and the engine can be started
by pressing the starter switch.
WHEN THE TRANSMISSION IS IN NEUTRAL
WHEN THE SIDESTAND IS UP AND THE
CLUTCH LEVER IS PULLED TO THE HAN-
DLEBAR

1

Battery 

2

Main fuse 

3

Main switch 

4

Ignition fuse 

5

Engine stop switch 

6

Starting circuit cut-off relay (relay unit)

7

Diode (relay unit)

8

Clutch switch 

9

Diode (relay unit)

0

Sidestand switch 

A

Neutral switch 

B

Start switch

C

ECU

D

Starter relay

E

Starter motor

F

Decompression solenoid fuse

G

Decompression solenoid coil

H

Decompression solenoid thermistor

7 - 24

–

+

ELEC

ELECTRIC STARTING SYSTEM

EAS00757

TROUBLESHOOTING

Check: 
1. main, ignition and decompression solenoid 

fuses 

2. battery 
3. starter motor 
4. relay unit (starting circuit cut-off relay)
5. relay unit (diode)
6. starter relay 
7. main switch 
8. engine stop switch 
9. neutral switch 
10.sidestand switch 
11.clutch switch 
12.start switch 
13.decompression solenoid
14.wiring connections 

(of the entire starting system)

NOTE:

_ 

• Before troubleshooting, remove the following

part(s): 

1. seat
2. headlight lens unit
• Troubleshoot with the following special

tool(s). 

EAS00738

YES

NO

EAS00739

YES

NO

EAS00758

YES

NO

The starter motor fails to turn.

Pocket tester 

YU-03112

1. Main, ignition and decompression solenoid

fuses 

• Check the main, ignition and decompres-

sion solenoid fuses for continuity. 
Refer to “CHECKING THE FUSES” in
chapter 3. 

• Are the main, ignition and decompression

solenoid fuses OK?

Replace the fuse(s).

2. Battery 

• Check the condition of the battery. 

Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3.

Minimum open-circuit voltage 

12.8 V or more at 20 °C (68 °F)

• Is the battery OK?

• Clean the battery

terminals. 

• Recharge or 

replace the battery.

3. Starter motor 

• Connect the positive battery terminal 

1

and starter motor lead 

2

 with a jumper

lead 

3

.

WARNING

_ 

• A wire that is used as a jumper lead

must have at least the same capacity or
more as that of the battery lead, other-
wise the jumper lead may burn. 

• This check is likely to produce sparks,

therefore make sure nothing flammable
is in the vicinity. 

• Does the starter motor turn?

Repair or replace the
starter motor.

7 - 25

–

+

ELEC

ELECTRIC STARTING SYSTEM

EAS00759

YES

NO

EAS00760

YES

NO

4. Relay unit (starting circuit cut-off relay)

• Remove the relay unit from the wire har-

ness. 

• Connect the pocket tester (

Ω

 

×

 1) and bat-

tery (12 V) to the relay unit terminals as
shown.

Positive battery terminal 

→

 black/red 

1

 

Negative battery terminal 

→

 black/yellow 

2

Positive tester probe 

→

 blue 

3

 

Negative tester probe 

→

 blue/white 

4

• Does the starting circuit cut-off relay have

continuity between blue and blue/white?

Replace the relay
unit.

5. Relay unit (diode)

• Remove the relay unit from the wire har-

ness. 

• Connect the pocket tester (

Ω

 

×

 1) to the

relay unit terminals as shown. 

• Measure the diode for continuity as fol-

lows.

L

/

G L

/

Y Sb B

/

Y Lg

B

/

R L

/

W

L

/

R

R

/

L

Br

/

B L

+

3

1

2

4

Positive tester probe 

→

 

sky blue 

1

Negative tester probe 

→

 

black/yellow 

2

Continuity

Positive tester probe 

→

 

sky blue 

1

Negative tester probe 

→

 

blue/yellow 

3

Positive tester probe 

→

 

blue/green 

4

Negative tester probe 

→

 

blue/yellow 

3

Positive tester probe 

→

 

black/yellow 

2

Negative tester probe 

→

 

sky blue 

1

No continuity

Positive tester probe 

→

 

blue/yellow 

3

Negative tester probe 

→

 

sky blue 

1

Positive tester probe 

→

 

blue/yellow 

3

Negative tester probe 

→

 

blue/green 

4

NOTE:

_ 

When you switch the tester’s positive and
negative probes, the readings in the above
chart will be reversed. 

• Are the testing readings correct?

Replace the relay
unit.

L

/

G L

/

Y Sb B

/

Y Lg

B

/

R L

/

W

L

/

R

R

/

L

Br

/

B L

4 3 1 2

7 - 26

–

+

ELEC

ELECTRIC STARTING SYSTEM

EAS00761

YES

NO

EAS00749

YES

NO

EAS00750

YES

NO

EAS00751

YES

NO

EAS00752

YES

NO

EAS00763

YES

NO

6. Starter relay 

• Remove the starter relay. 
• Connect the pocket tester (

Ω

 

×

 1) and bat-

tery (12 V) to the starter relay terminals as
shown.

Positive battery terminal 

→

 red/white 

1

 

Negative battery terminal 

→

 blue 

2

Positive tester probe 

→

 red 

3

 

Negative tester probe 

→

 black 

4

• Does the starter relay have continuity

between red and black?

Replace the starter
relay.

7. Main switch 

• Check the main switch for continuity. 

Refer to “CHECKING THE SWITCHES”. 

• Is the main switch OK?

Replace the main
switch.

8. Engine stop switch 

• Check the engine stop switch for continu-

ity. 
Refer to “CHECKING THE SWITCHES”. 

• Is the engine stop switch OK?

Replace the right
handlebar switch.

9. Neutral switch 

• Check the neutral switch for continuity. 

Refer to “CHECKING THE SWITCHES”. 

• Is the neutral switch OK?

Replace the neutral
switch.

10.Sidestand switch 

• Check the sidestand switch for continuity. 

Refer to “CHECKING THE SWITCHES”. 

• Is the sidestand switch OK?

Replace the side-
stand switch.

11.Clutch switch 

• Check the clutch switch for continuity. 

Refer to “CHECKING THE SWITCHES”. 

• Is the clutch switch OK?

Replace the clutch
switch.

7 - 27

–

+

ELEC

ELECTRIC STARTING SYSTEM

EAS00764

YES

NO

YES

NO

EAS00766

YES

NO

12.Start switch 

• Check the start switch for continuity. 

Refer to “CHECKING THE SWITCHES”. 

• Is the start switch OK?

Replace the right
handlebar switch.

13.Decompression solenoid 

• Disconnect the decompression solenoid

couplers from the wire harness. 

• Connect the pocket tester (

Ω

 

×

 10) to the

decompression solenoid coupler as
shown.

Positive tester probe 

→

 green 

1

 

Negative tester probe 

→

 green 

2

 

• Measure the decompression solenoid

resistance.

Decompression solenoid 
resistance (thermistor)

70 

Ω

 at 25 °C (77 °F) 

NOTE:

_ 

The resistance value for the thermistor
changes when the temperature changes;
therefore, measure the decompression sole-
noid resistance at the specified temperature. 

• Connect the pocket tester (

Ω

 

×

 1) to the

decompression solenoid coupler as
shown.

Positive tester prove 

→

 black 

3

Negative tester probe 

→

 black 

4

Decompression solenoid 
resistance

1.2 

Ω

 at 20 °C (68 °F) 

• Check the decompression solenoid for

continuity. 

• Is the decompression solenoid OK?

Replace the decom-
pression solenoid.

14.Wiring 

• Check the entire starting system’s wiring. 

Refer to “CIRCUIT DIAGRAM”. 

• Is the starting system’s wiring properly

connected and without defects?

Replace the ECU.

Properly  connect  or
repair the starting
system’s wiring.