Yamaha MT-09 2021 - Checking the Coolant Temperature Sensor; Checking the Radiator Fan Motor; Checking the Throttle Servo Motor

8-63
ELECTRICAL COMPONENTS
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.
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.
WARNING
EWA14130
• 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.
a. Connect the digital circuit tester (Ω) to the
coolant temperature sensor as shown.
b. Immerse the coolant temperature sensor
“1” in a container filled with coolant “2”.
TIP
Make sure the coolant temperature sensor ter-
minals do not get wet.
c. Place a thermometer “3” in the coolant.
d. Heat the coolant or let it cool down to the
specified temperatures.
e. Measure the coolant temperature sensor
resistance.
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.
• Positive tester probe
blue “1”
• Negative tester probe
black “2”
ABS
1
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)
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
Coolant temperature sensor
15 N·m (1.5 kgf·m, 11 lb·ft)
3
1
2
G089056
T
R
.
.