Troubleshooting - Yamaha MT-09 2021 Service Manual

EAS30503

TROUBLESHOOTING

TIP
• Before troubleshooting, remove the following part(s):
1. Rider seat
2. Fuel tank side cover
3. Fuel tank center cover
4. Fuel tank
5. Air filter case
1. Check the fuses.
(Main, ignition 1, backup 2, and ra-
diator fan motor)
Refer to "CHECKING THE FUS-
ES" on page 8-55.
OK↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-56.
OK↓
3. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-53.
OK↓
4. Check the radiator fan motor.
Refer to "CHECKING THE RADIA-
TOR FAN MOTOR" on page 8-63.
OK↓
5. Check the radiator fan motor relay.
Refer to "CHECKING THE RE-
LAYS" on page 8-56.
OK↓
6. Check the coolant temperature
sensor.
Refer to "CHECKING THE COOL-
ANT TEMPERATURE SENSOR"
on page 8-63.
OK↓
7. Check the entire cooling system's
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-39.
OK↓
NG→ Replace the fuse(s).
• Clean the battery terminals.
NG→
• Recharge or replace the battery.
NG→ Replace the main switch/immobilizer unit.
NG→ Replace the radiator fan motor(s).
NG→ Replace the radiator fan motor relay.
NG→ Replace the coolant temperature sensor.
Properly connect or repair the cooling sys-
NG→
tem's wiring.
8-43
COOLING SYSTEM