Snowmobile Yamaha Phazer PZ50 (2007-2008 year). Manual - part 81

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ELEC

SIGNAL SYSTEM

Check the main fuse and ignition fuse.
Refer to “FUSE INSPECTION” in CHAPTER 2.

Check the battery.
Refer to “BATTERY INSPECTION” in CHAPTER 2.

Check the stator coil.
Refer to “CHARGING SYSTEM”.

Check the engine stop switch and main switch.
Refer to “IGNITION SYSTEM”.

Check the speed sensor.

Check the load control relay.
Refer to “LIGHTING SYSTEM”.

Check the signal system’s wiring.
Refer to “CIRCUIT DIAGRAM”.

Correct the connection and/or replace the 
speedometer unit, rectifier/regulator, and/or ECU.

SPEEDOMETER DOES NOT OPERATE.

OK

FAULTY

Replace the main fuse and/or ignition fuse.

OK

OUT OF SPECIFICATION

Replace and/or charge the battery.
Refer to “BATTERY INSPECTION” in CHAPTER 
2.

OK

OUT OF SPECIFICATION

Replace the stator coil assembly.

OK

FAULTY

Replace the left handlebar switch and/or main 
switch.

OK

FAULTY

Replace the speed sensor.

OK

FAULTY

Replace the load control relay.

OK

FAULTY

Properly connect or repair the signal system’s wir-
ing.

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ELEC

SIGNAL SYSTEM

Check the main fuse, ignition fuse, and signal fuse.
Refer to “FUSE INSPECTION” in CHAPTER 2.

Check the battery.
Refer to “BATTERY INSPECTION” in CHAPTER 2.

Check the stator coil.
Refer to “CHARGING SYSTEM”.

Check the engine stop switch and main switch.
Refer to “IGNITION SYSTEM”.

Check the load control relay.
Refer to “LIGHTING SYSTEM”.

Check the DC back buzzer.

Check the signal system’s wiring.
Refer to “CIRCUIT DIAGRAM”.

Correct the connection and/or replace the rectifier/
regulator and/or ECU.

BACK BUZZER DOES NOT SOUND. (PZ50GT/PZ50FX/PZ50M/PZ50VT/PZ50MP)

OK

FAULTY

Replace the main fuse, ignition fuse, and/or signal 
fuse.

OK

OUT OF SPECIFICATION

Replace and/or charge the battery.
Refer to “BATTERY INSPECTION” in CHAPTER 
2.

OK

OUT OF SPECIFICATION

Replace the stator coil assembly.

OK

FAULTY

Replace the left handlebar switch and/or main 
switch.

OK

FAULTY

Replace the load control relay.

OK

DOES NOT SOUND

Replace the DC back buzzer.

OK

FAULTY

Properly connect or repair the signal system’s wir-
ing.

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ELEC

SIGNAL SYSTEM

BRAKE LIGHT SWITCH

1. Disconnect:

• Brake light switch coupler

2. Connect:

• Pocket tester

(to the brake light switch coupler)

3. Check:

• Brake light switch continuity

Faulty 

→ Replace.

Switch position

Continuity

Brake lever operates

Yes

Brake lever does not 
operate

No

L/R

G

DRIVE POSITION SWITCH AND REVERSE 
POSITION SWITCH (PZ50GT/PZ50FX/
PZ50M/PZ50VT/PZ50MP)

1. Remove:

• Drive position switch and reverse position

switch

2. Connect:

• Pocket tester

(to the drive position switch and reverse posi-
tion switch)

3. Check:

• Drive position switch and reverse position

switch continuity
Faulty 

→ Replace.

DC BACK BUZZER (PZ50GT/PZ50FX/
PZ50M/PZ50VT/PZ50MP)

1. Disconnect:

• DC back buzzer coupler 

2. Connect:

• Battery 

3. Check:

• DC back buzzer

Does not sound 

→ Replace.

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ELEC

SIGNAL SYSTEM

COOLANT TEMPERATURE SENSOR

1. Remove the coolant temperature sensor.

CAUTION:

Handle the coolant temperature 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 1 

(to the coolant temperature sensor)

NOTE:

Set the tester selector to the “

Ω × 1k” position.

3. Immerse the coolant temperature sensor 2 in

coolant  3 and check the coolant temperature
sensor operation.

4 Temperature gauge

CAUTION:

Never heat the coolant to a temperature of
120 °C (248 °F) or more.

4. If the coolant temperature sensor operation is

defective, replace it.

5. Install the coolant temperature sensor and con-

nect the coolant temperature sensor coupler.

CAUTION:

Do not overtighten the coolant temperature
sensor.

Coolant temperature sensor resis-
tance:

5.21 ~ 6.37 k

Ω at 0 °C (32 °F) 

0.290 ~ 0.354 k

Ω at 80 °C (176 °F)

T

 

R

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Coolant temperature sensor:

23 Nm (2.3 m · kg, 17 ft · lb)