Yamaha YZF-R1(B) 2012 Service Manual page 428

EAS27320
TROUBLESHOOTING
TIP
• Before troubleshooting, remove the following part(s):
1. Rider seat
2. Fuel tank
3. Side cowlings
1. Check the fuses.
(Main, ignition and radiator fan
motor)
Refer to "CHECKING THE FUSES"
on page 8-129.
OK↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-129.
OK↓
3. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-125.
OK↓
4. Check the radiator fan motors.
Refer to "CHECKING THE RADIA-
TOR FAN MOTOR" on page 8-142.
OK↓
5. Check the radiator fan motor relay.
Refer to "CHECKING THE
RELAYS" on page 8-133.
OK↓
6. Check the coolant temperature
sensor.
Refer to "CHECKING THE COOL-
ANT TEMPERATURE SENSOR"
on page 8-142.
OK↓
7. Check the entire cooling system's
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-29.
OK↓
Replace the ECU.
NG→
Replace the fuse(s).
NG→
• Clean the battery terminals.
• 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 sen-
sor.
NG→
Properly connect or repair the cooling
system's wiring.
8-31
COOLING SYSTEM