Checking The Speed Sensor; Checking The Thermo Switch - Yamaha XT250X Service Manual

b
a
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EAS28240

CHECKING THE SPEED SENSOR

1. Disconnect:
Speed sensor coupler
G
2. Check:
Speed sensor resistance
G
Out of specification → Replace.
Speed sensor resistance
470–530 Ω 25 °C (77 °F)
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a. Connect the digital circuit tester to the speed
sensor coupler (wire harness side).
Digital circuit tester
90890-03174
Model 88 Multimeter with tachom-
eter
YU-A1927
Positive tester probe
White "1"
Negative tester probe
Black "2"
1
b. Measure the speed sensor resistance.
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2
ELECTRICAL COMPONENTS
EAS28270

CHECKING THE THERMO SWITCH

1. Remove:
Thermo switch
G
(from the thermostat housing)
EWA13830
WARNING
Handle the thermo switch with special care.
G
Never subject the thermo switch to strong
G
shocks. If the thermo switch is dropped, re-
place it.
2. Check:
Thermo switch continuity
G
Out of specification → Replace the thermo
switch.
Test step Coolant temperature
1 Less than 16°C (61°F)
2 More than 16°C (61°F)
3 More than 11°C (52°F)
4 Less than 11°C (52°F)
Step 1 and 2: Heating phase
Step 3 and 4: Cooling phase
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a. Connect the pocket tester (Ω × 1) to the ther-
mo switch "1" as shown.
b. Immerse the thermo switch in a container
filled with coolant "2".
c. Place a thermometer "3" in the coolant.
d. Slowly heat the coolant, then let it cool down
to the specified temperature.
7-46
Continuity
YES
NO
NO
YES