Checking The Coolant Temperature Sensor - Yamaha YFM70RY Service Manual

TIP
The radiator fan motor circuit breaker "1" is at-
tached to the wire harness with white tape near
the headlight relay "2".
2. Check:
• Radiator fan motor circuit breaker resistance
Out of specification → Replace the radiator
fan motor circuit breaker.
Radiator fan motor circuit break-
er resistance
Zero Ω at 20 °C (68 °F)
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a. Connect the pocket tester (Ω × 1) to the radi-
ator fan motor circuit breaker as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
b. Measure the radiator fan motor circuit break-
er resistance.
L LLL L LLL L L LLL L
EAS28260
CHECKING THE COOLANT TEMPERATURE
SENSOR
1. Remove:
• Coolant temperature sensor
EWA14130
WARNING
• Handle the coolant temperature sensor
with special care.
2
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
ELECTRICAL COMPONENTS
• 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.
1
M MMM M MMM M
a. Connect the pocket tester (Ω × 100) to the
coolant temperature sensor terminals as
shown.
MMM
b. Immerse the coolant temperature sensor "1"
in a container filled with coolant "2".
LLL
TIP
Make sure the coolant temperature sensor ter-
minals do not get wet.
c. Place a thermometer "3" in the coolant.
d. Slowly heat the coolant, and then let it cool
down to the specified temperature.
8-72
Coolant temperature sensor re-
sistance
2.32–2.59 kΩ at 20 °C (68 °F)
0.310–0.326 kΩ at 80 °C (176 °F)
M MMM M M MMM M M MMM M
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
M MMM M MMM