Troubleshooting - Yamaha WR450FN 2022 Owner's Service Manual

EAM30351

TROUBLESHOOTING

The radiator fan motor fails to turn.
TIP
Before troubleshooting, remove the following part(s):
1. Seat
2. Side cover (left)
3. Air scoop (left/right)
4. Fuel tank
1. Check the fuse.
Refer to "CHECKING THE FUSES"
on page 8-59.
OK
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-60.
OK
3. Check the main relay.
Refer to "CHECKING THE RE-
LAYS" on page 8-62.
OK
4. Check the radiator fan motor.
Refer to "CHECKING THE RADIA-
TOR FAN MOTOR" on page 8-69.
OK
5. Check the radiator fan motor relay.
Refer to "CHECKING THE RE-
LAYS" on page 8-62.
OK
6. Check the coolant temperature sen-
sor.
Refer to "CHECKING THE COOL-
ANT TEMPERATURE SENSOR"
on page 8-69.
OK
7. Check the entire cooling system's
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-23.
OK
Replace the ECU.
Replace the fuse(s).
NG
• Clean the battery terminals.
• Recharge or replace the battery.
NG
Replace the main relay.
NG
Replace the radiator fan motor.
NG
Replace the radiator fan motor relay.
NG
Replace the coolant temperature sensor.
NG
Properly connect or repair the cooling sys-
tem's wiring.
NG
8-25
COOLING SYSTEM