Checking The Coolant Temperature Sensor; Checking The Throttle Position Sensor Input Voltage - Yamaha YZ 2019 Series Owner's Service Manual

• Positive tester probe 
Black "1"
• Negative tester probe 
Black "2"
b. Measure the resistance of the resister.
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EAM30303
CHECKING THE COOLANT TEMPERATURE
SENSOR
1. Remove:
• Coolant temperature sensor
EWA14130
WARNING
• 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.
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)
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a. Connect the digital circuit tester () to the
coolant temperature sensor.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe 
• Negative tester probe 
1
2
b. Immerse the coolant temperature sensor in a
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
e. Check the coolant temperature sensor for
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EAM30305
CHECKING THE THROTTLE POSITION
SENSOR INPUT VOLTAGE
1. Check:
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a. Connect the test harness S– pressure sensor
8-66
ELECTRICAL COMPONENTS
Green/White "1"
Black/Blue "2"
G/W
G/W B/L
1
container filled with coolant.
the specified temperature indicated in the ta-
ble.
continuity at the temperatures indicated in the
table.
• Throttle position sensor input voltage
Out of specification  Replace the ECU.
Throttle position sensor input
voltage
4–6 V
(3P) to the throttle position sensor coupler
B/L
2