Yamaha YP125R, Service Manual

Page: 426 / 498

COOLING SYSTEM
8-29
EAS27320
TROUBLESHOOTING
• The radiator fan motor fails to turn.
TIP
• Before troubleshooting, remove the following part(s):
1. Storage box
2. Front cowling
3. Radiator cover
NG
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OK
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OK
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OK
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OK
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1. Check the fuses.
(Main, ignition, ECU, and radiator
fan motor)
Refer to “CHECKING THE FUS-
ES” on page 8-77.
Replace the fuse(s).
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 8-78. • Clean the battery terminals.
• Recharge or replace the battery.
3. Check the main switch.
Refer to “CHECKING THE
SWITCHES” on page 8-73. Replace the main switch/immobilizer unit.
4. Check the radiator fan motor.
Refer to “CHECKING THE RADIA-
TOR FAN MOTOR” on page 8-87. Replace the radiator fan motor.
5. Check the radiator fan motor relay.
Refer to “CHECKING THE RE-
LAYS” on page 8-80. Replace the radiator fan motor relay.
6. Check the coolant temperature sen-
sor.
Refer to “CHECKING THE COOL-
ANT TEMPERATURE SENSOR”
on page 8-87.
Replace the coolant temperature sensor.
7. Check the entire cooling system
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 8-27. Properly connect or repair the cooling sys-
tem wiring.
Replace the ECU.