Yamaha YZFR1W 2007 Service Manual page 415

b. Set the main switch to "ON".
c. Elevate the rear wheel and slowly rotate it.
d. Measure the voltage (DC 5 V) of White/Yel-
low and Black/Blue. With each full rotation
of the rear wheel, the voltage reading
should cycle from 0.6 V 4.8V to 0.6 V to 4.8
V.
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EAS4C81021
CHECKING THE RADIATOR FAN MOTORS
1. Check:
• Radiator fan motor
Faulty/rough movement → Replace.
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a. Disconnect the radiator fan motor coupler
from the wire harness.
b. Connect the battery (DC 12 V) as shown.
• Positive tester probe
Blue "1"
• Negative tester probe
Black "2"
c. Measure the radiator fan motor movement.
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EAS28260
CHECKING THE COOLANT TEMPERATURE
SENSOR
1. Remove:
• Coolant temperature sensor
EWA14130
WARNING
• Handle the coolant temperature sensor
with special care.
ELECTRICAL COMPONENTS
• Never subject the coolant temperature
sensor to strong shocks. If the coolant
temperature sensor is dropped, replace it.
2. Check:
• Coolant temperature sensor resistance
Out of specification → Replace.
Coolant
resistance
0°C (32°F): 5.21–6.37 kΩ
80°C (176°F): 0.29–0.35 kΩ
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a. Connect the pocket tester (Ω × 100) to the
coolant temperature sensor "1" as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
Coolant temperature sensor terminal
• Negative tester probe
Coolant temperature sensor terminal
b. Immerse the coolant temperature sensor in
a container filled with coolant "2".
NOTE:
Make sure the coolant temperature sensor ter-
minals do not get wet.
c. Place a thermometer "3" in the coolant.
8-96
temperature sensor