Checking The Radiator Fan Motor; Checking The Throttle Position Sensor - Yamaha WR250R Service Manual

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b. Immerse the coolant temperature sensor in a
container filled with coolant.
NOTE:
Make sure the coolant temperature sensor ter-
minals do not get wet.
c. Place a thermometer in the coolant.
d. Slowly heat the coolant, and then let it cool to
the specified temperature indicated in the ta-
ble.
e. Check the coolant temperature sensor for
continuity at the temperatures indicated in
the table.
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EAS28250

CHECKING THE RADIATOR FAN MOTOR

1. Check:
Radiator fan motor
G
Faulty/rough movement → Replace.
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a. Disconnect the radiator fan motor coupler
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8-79
ELECTRICAL COMPONENTS
from the wire harness.
b. Connect the battery (DC 12 V) as shown.
Positive tester probe
Blue "1"
Negative tester probe
Black "2"
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c. Measure the radiator fan motor movement.
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EAS28300
CHECKING THE THROTTLE POSITION
SENSOR
1. Check:
Throttle position sensor
G
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a. Connect the pocket tester (DC 20 V) to the
throttle position sensor as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Tester positive lead →
Yellow "1"
Tester negative lead →
Black/Blue "2"
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b. While slowly turning the throttle position sen-
2
2