Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Manual - part 82

8-40

–

+

ELEC

SIGNAL SYSTEM

OIL LEVEL SWITCH

1. Remove:

• Oil level switch 

2. Connect:

• Pocket tester

(to the oil level switch coupler)

3. Check:

• Oil level switch continuity

Faulty 

→ Replace.

: Continuity

: No continuity

Switch position

Good 

condition

Bad condition

È

Down 
position

É Up position

Ch R/B

È

É

FUEL SENDER

1. Remove:

• Fuel sender 

(from the fuel tank) 

2. Connect:

• Pocket tester

(to the fuel sender coupler)

3. Measure:

• Fuel sender resistance (full 

a)

• Fuel sender resistance (empty 

b)

Out of specification 

→ Replace.

Fuel sender resistance (full):

10 ~ 12 

Ω at 20 °C (68 °F)

Fuel sender resistance (empty):

179 ~ 185 

Ω at 20 °C (68 °F)

a

b

+

–

Ω × 1

B

G

8-41

–

+

ELEC

SIGNAL SYSTEM

SPEED SENSOR

1. Inspect:

• Speed sensor

Inspection steps:

• Connect the pocket tester (DC 20 V) to the

speed sensor coupler (wire harness side) as
shown.

• Elevate the track and slowly rotate it.
• Measure the voltage (DC 5 V) of white/yellow

and black/blue. With each full rotation of the
track the voltage reading should cycle from 0.6
V to 4.8 V to 0.6 V to 4.8 V.
Out of specification 

→ Replace.

Positive tester probe 

→ White/Yellow

Negative tester probe 

→ Black/Blue

Positive battery terminal 

→ Blue

Negative battery terminal 

→ Black/Blue

KNOCK SENSOR

1. Remove:

• Knock sensor

CAUTION:

Handle the knock sensor with special care.
Never subject it to shock or allow it to be
dropped. If it is dropped, it must be replaced.

2. Connect:

• Pocket tester

(to the knock sensor coupler and sensor
body)

3. Measure:

• Knock sensor resistance

Out of specification 

→ Replace.

4. Install the knock sensor and connect the knock

sensor coupler.

CAUTION:

Do not overtighten the knock sensor.

Knock sensor resistance:

504 ~ 616 k

Ω at 20 °C (68 °F)

T

 

R

.

.

Knock sensor:

27 Nm (2.7 m · kg, 19 ft · lb)

+

–

Ω × 100

B

8-42

–

+

ELEC

GRIP WARMER SYSTEM

GR

IP W

ARMER SYSTEM

CIRC

UIT D

IAGRA

M

B

R

/L

(20A)

R

/W

R

/W

R

/W

O

R

/W

(BLACK)

O

O

O

B

L/

W

B

G

Lg

Y

(BLACK)

OFF

ON

START

W

W

W

W

W

W

B

/L

Gy

L

/W

Lg

G

L

L

/W

R

/W

R

/G

L/

W

(10A)

HI

LO

G

B

Y

G

B

Y

OFF

ON

R

B

R

R

W

W

Lg

Y

B

B

B

B

B

Y

G

Y

G

R

/G

R

R

R

R

B

B

B

CLOSE

OPEN

B

/Y

Ch

RUN

STOP

Br

/L

W

Br

R

B

Y

/R

B

/R

B

/R

Y

/L

Y

/L

Y

/W

Y

/W

Ch

B

/L

Y

/W

Y

/L

Ch

B

R

/Y

Ch

R

/B

B

Gy

(BLACK)

B

/L

Gy

Br

B

/W

R

Br

/L

W

Br

(GLAY)

WW

W

R

Br

Br

R

/W

L/

W

R

/Y

B

Br

/W

L

/W

R

R

B

B

R

R

L

/Y

B

/R

R

/W

L/

W

Br

/W

Br

Br

R

/W

B

/Y

B

/Y

Ch

B

/L

(BLACK)

(BLACK)

(BLACK)

(BLACK)

L

/YR

/B

Y

Ch

B

/R

R

/WG

/B

G

L/

R

B

LY

B

W

/Y

L

B

/L

P

O

/R

B

/W

W

/B

L

B

/L

(BLACK)

WL

B

(BLACK)

R

/LR

/B

R

/LG

/B

G

/WB

/L

R

/L

L

/R

R

/G

R

/W

L

/R

R

/L

R

/W

R

/G

Y

/G

Y

/G

B

G

G

Ch

Ch

G

/B

G

/B

R

/B

Ch

(GLAY)

(GLAY)

R

/Y

L

/R

L

/W

Br

B

R

R

R

B

B

(BLACK)

L

/W

R

/W

R

/W

L

/W

B

Lg

Y

/R

O

/B

L

/Y

G

/Y

B

/Y

L

/W

R

/W

R

/W

Y

/L

Br

/B

Y

/L

Y

/W

Sb

/W

G

/W

Br

/W

B

/L

G

/B

W

/B

W

/Y

P

/W

L

/R

R

/L

R

/B

Gy

/R

Gy

Br

/L

Y

/G

Lg

Lg

Y

L

W

P

B

O

B

Ch

R

/L

R

/L

G

/B

G

/B

G

/B

R

/B

B

R

/L

B

B

B

(BLACK)

B

/L

W

/B

L

B

/L

W

/Y

L

Y

B

/L

L

P

/W

B

/L

L

A

R

/L

R

/L

B

/L

G

/W

Br

/W

B

/L

L

P

/W

B

/L

L

/R

L

/R

R

/W

G

Lg

L

/W

Y

Y

W

G

/W

Gy

B

/YW

/YY

/W

W

/L

W

/RO

/B

Br

/B

B

/R

P

/WR

/L

Y

/G

Ch

B

/L

L

/Y

Lg

R

/W

Br

/W

L

/WP

Y

/L

L

W

/BR

/W

O

Y

/R

Y

/LG

/Y

Br

/L

L

/R

B

R

/B

Lg

B

G

/B

Gy

/R

Sb

/W

Br

/W

B

/L

(40A)

(20A)

(15A)

(3A)

(4A)

(7.5A)

R

/W

Gy

/R

R

/W

(BLACK)

A

Gy

/R

A

A

R

/B

R

/B

A

(BLACK)

(DARK GREEN)

L

P

B

/L

L

P

B

/L

Gy

/R

Gy

/R

C

B

/L

B

/L

C

G

/W

G

/W

W

B

C

Ch

Ch

Ch

A

(BLACK)

(BLACK)

W

Lg

Lg

(BLACK)

(GRAY)

Y

B

/L

L

(BLACK)

(GRAY)

R

/L

R

/L

B

(BLACK)

R

B

(BLACK)

(GRAY)

(BLACK)

(BLACK)

B

R

/L

(BLACK)

E

W

/R

W

/R

E

W

/L

W

/L

W

/R

W

/L

B

/R

W

/R

W

/L

B

Y

/R

B

Y

/R

Br

/R

G

/Y

L

R

/W

Br

/R

Br

/R

L

L

L

R

/W

G

/Y

B

L

B

L

(BLACK)

W

W

O

/B

O

/B

B

R

/G

W

/B

G

B

O

/B

L/

R

G

B

/R

B

Y

/R

B

Y

/R

B

G

L/

R

G

B

Ch

G

/B

Lg

B

W

B

B

B

B

B

B

B

Y

/R

B

/R

B

B

O

/B

L

/R

LO

OFF

HI

G

/R

O

/B

Y

/L

(BLACK)

G

/R

O

/B

Y

/L

(BLACK)

G

B

Y

G

/R

B

Y

/L

G

B

Y

G

/R

B

Y

/L

D

B

B

O

/B

Y

/L

G

/R

Y

/L

Y

/L

G

/R

G

/R

B

B

Y

/L

O

/B

L/

R

L/

R

Y

/L

O

/B

L

/R

L

/R

D

O

/B

O

/B

Br

/B

Y

/R

R

/G

Br

/R

R

/G

(BLACK)

Sb

/W

R

/G

R

/G

B

Sb

(BLACK)

Sb

/W

L/

B

Y

/R

B

Br

/R

Sb

L/

B

E

Sb

Sb

Sb

R

/G

R

/G

R

/G

Y/

R

B

B

R

/G

Y/

R

Br

/B

Br

/R

Sb

Sb

/W

Sb

/W

L/

B

L/

B

Br

/R

E

L/

B

L/

B

E

Br

/R

Br

/R

D

L

/R

L

/R

D

G

G

F

G

G

F

F

Y

Y

L/

R

O

/B

Br

P

(BLACK)

|

M

L

K

Z

BC

E

E

7

6

0

9

g

j

u

t

s

s

2

4

3

i

y

z

{

~}

5

A

k

F

G

Y

X

T

S

V

U

R

O

P

Q

8

J

N

h

W

b

a

d

L

m

n

o

p

q

r

l

1

D

HI

EE

w

v

x

e

f

f

c

[

\]

^

Ë

É

Ê

Í

Ì

È

E

WIRE HARNESS

GEAR MOTOR

SUB-WIRE

HARNESS

F

WIRE HARNESS

HEADLIGHT

SUB-WIRE

HARNESS

YG

B

Y

G

B

D

WIRE HARNESS

SUB-WIRE

HARNESS 3

B

O

/B

GL

/R

BO

/B

G

L

/R

B

WIRE HARNESS

FUEL PUMP

SUB-WIRE

HARNESS

R

/L

B

C

WIRE HARNESS

SUB-WIRE

HARNESS 2

B

/L

G

/W

Ch

B

/L

G

/W

Ch

A

WIRE HARNESS

SUB-WIRE

HARNESS 1

R

/W

O

R

/B

Gy

/R

G

/BR

/L

R

/W

O

R

/B

Gy

/R

G

/B

R

/L

ÈÈ

W

/R

Br

/R

L/

B

Sb

W

/L

W

/R

Br

/R

L/

B

Sb

W

/L

8-43

–

+

ELEC

GRIP WARMER SYSTEM

GRIP WARMER 
SYSTEM

CIRCUIT DIAGRAM

2 A.C. magneto
3 Rectifier/regulator
4 Main switch
5 Main fuse
6 Load control relay
0 Battery
B Engine stop switch
E Grip warmer
F Thumb warmer
J ECU (engine control unit)
Z Grip/thumb warmer adjust-

ment switch

c Passenger grip warmer relay
e Passenger grip warmer 

switch

f Passenger grip warmer
l Multi-function meter
y Ignition fuse
{ Signal fuse

È PZ50VT/PZ50MP
Ê PZ50VT (STANDARD)/PZ50MP 

(OPTION)

Ì PZ50/PZ50GT/PZ50M/PZ50VT/

PZ50MP

Í PZ50FX