Yamaha YZ 2019 Series, Owner'S Service Manual

Page: 365 / 398

ELECTRICAL COMPONENTS
8-66
b. Measure the resistance of the resister.
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EAM30303
CHECKING THE COOLANT TEMPERATURE
SENSOR
1. Remove:
• Coolant temperature sensor
WARNING
EWA14130
• Handle the coolant temperature sensor
with special care.
• Never subject the coolant temperature sen-
sor to strong shocks. If the coolant temper-
ature sensor is dropped, replace it.
2. Check:
• Coolant temperature sensor resistance
Out of specification

Replace.
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a. Connect the digital circuit tester (

) to the
coolant temperature sensor.
b. Immerse the coolant temperature sensor in a
container filled with coolant.
TIP
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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EAM30305
CHECKING THE THROTTLE POSITION
SENSOR INPUT VOLTAGE
1. Check:
•
Throttle position sensor input voltage
Out of specification

Replace the ECU.
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a. Connect the test harness S– pressure sensor
(3P) to the throttle position sensor coupler
• Positive tester probe

Black “1”
• Negative tester probe

Black “2”
Coolant temperature sensor re-
sistance
2513–2777  at 20  C (2513–
2777  at 68  F)
Coolant temperature sensor re-
sistance
210–221  at 100  C (210–221 
at 212  F)
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
1
2
• Positive tester probe

Green/White “1”
• Negative tester probe

Black/Blue “2”
Throttle position sensor input
voltage
4–6 V
1 2
G/W B/L
B/L G/W