Checking The Radiator Fan Motor; Checking The Coolant Temperature Sensor; Checking The Throttle Servo Motor - Yamaha MT-09 2021 Service Manual

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EAS30577

CHECKING THE RADIATOR FAN MOTOR

1. Check:
• Radiator fan motor
Faulty/rough movement → Replace.
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.
EAS30578
CHECKING THE COOLANT TEMPERATURE
SENSOR
1. Remove:
• Coolant temperature sensor
Refer to "CYLINDER HEAD" on page 5-26.
EWA14130
WARNING
• Handle the coolant temperature sensor
with special care.
• Never subject the coolant temperature sen-
sor to strong shocks. If the coolant tem-
perature sensor is dropped, replace it.
2. Check:
• Coolant temperature sensor resistance
Out of specification → Replace.
ELECTRICAL COMPONENTS
ABS
a. Connect the digital circuit tester (Ω) to the
b. Immerse the coolant temperature sensor
TIP
Make sure the coolant temperature sensor ter-
minals do not get wet.
c. Place a thermometer "3" in the coolant.
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G089056
d. Heat the coolant or let it cool down to the
e. Measure the coolant temperature sensor
3. Install:
• Coolant temperature sensor
EAS30592

CHECKING THE THROTTLE SERVO MOTOR

1. Remove:
• Air filter case
Refer to "GENERAL CHASSIS (1)" on
page 4-1.
8-63
Coolant temperature sensor re-
sistance
2513–2777 Ω at 20 °C (2513–
2777 Ω at 68 °F)
Coolant temperature sensor re-
sistance
210–221 Ω at 100 °C (210–221 Ω
at 212 °F)
coolant temperature sensor as shown.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
"1" in a container filled with coolant "2".
1
2
specified temperatures.
resistance.
Coolant temperature sensor
15 N·m (1.5 kgf·m, 11 lb·ft)