Yamaha XT660R, Service Manual

Page: 430 / 462

8 - 48
– +
ELEC
SIGNALING SYSTEM
EAS00812
YES NO
EAS00813
YES
NO
3. Coolant temperature sensor
• Remove the coolant temperature sensor
from the engine.
• Connect the pocket tester (
Ω ×
10) to the
coolant temperature sensor 1 as shown.
• Immerse the coolant temperature sensor
in a container filled with coolant
2
.
NOTE:
_
Make sure that the coolant temperature sen-
sor terminals do not get wet.
• Place a thermometer
3
in the coolant.
• Slowly heat the coolant, and then let it cool
to the specified temperature indicated in
the table.
• Check the coolant temperature sensor for
continuity at the temperatures indicated in
the table.
Test
step Coolant
temperature
Resistance
1 20 °C (68 °F) 2.32 ~ 2.59 k
Ω
2 80 °C (176 °F) 0.310 ~ 0.326 k
Ω
3 110 °C (230 °F) 0.140 ~ 0.145 k
Ω
WARNING
_
• Handle the coolant temperature sensor
with special care.
• Never subject the coolant temperature
sensor to strong shocks. If the coolant
temperature sensor is dropped, replace
it.
T
R
.
.
Coolant temperature sensor
18 Nm (1.8 m · kg, 13 ft · lb)
• Does the coolant temperature sensor
operate properly?
Replace the coolant
temperature sensor.
4. Wiring
• Check the entire cooling system’s wiring.
Refer to “CIRCUIT DIAGRAM”.
• Is the cooling system’s wiring properly
connected and without defects?
Replace the ECU. Properly connect or
repair the cooling
system’s wiring.
1
3
2