Yamaha MTN850-A 2017 Service Manual page 527

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.
3
d. Heat the coolant or let it cool down to the
specified temperatures.
e. Measure the coolant temperature sensor re-
sistance.
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3. Install:
• Coolant temperature sensor
Coolant temperature sensor
16 N·m (1.6 kgf·m, 12 lb·ft)
EAS30581
CHECKING THE THROTTLE POSITION
SENSOR
1. Remove:
• Throttle position sensor
(from the throttle bodies)
ECA17540
NOTICE
• Handle the throttle position sensor with
special care.
• Never subject the throttle position sensor
to strong shocks. If the throttle position
sensor is dropped, replace it.
2. Check:
• Throttle position sensor maximum resistance
Out of specification  Replace the throttle
position sensor.
Resistance
1.20–2.80 k
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a. Connect the digital circuit tester () to the
throttle position sensor terminals as shown.
1
2
ELECTRICAL COMPONENTS
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe 
blue "1"
• Negative tester probe 
black/blue "2"
1
b. Measure the throttle position sensor maxi-
mum resistance.
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3. Install:
• Throttle position sensor
TIP
When installing the throttle position sensor, ad-
just its angle properly. Refer to "ADJUSTING
THE THROTTLE POSITION SENSOR" on page
7-12.
EAS30582
CHECKING THE ACCELERATOR POSITION
SENSOR
1. Remove:
• Accelerator position sensor
(from the throttle bodies)
EWA15960
WARNING
• Handle the accelerator position sensor with
special care.
• Never subject the accelerator position sen-
sor to strong shocks. If the accelerator po-
sition sensor is dropped, replace it.
2. Check:
• Accelerator position sensor maximum resis-
tance
Out of specification  Replace the accelera-
tor position sensor.
Resistance
1.08–2.52 k
8-170
2
B L W B/L