Yamaha RS90K, Service Manual

Page: 696 / 841

8-33
– +
ELEC
SIGNAL SYSTEM
2. Connect:
• Battery
3. Check:
• DC back buzzer
Does not sound
→
Replace.
COOLANT TEMPERATURE SENSOR
1. Disconnect the coolant temperature sensor
coupler 1 and remove the coolant temperature
sensor.
CAUTION:
Handle the coolant temperature sensor with
special care. Never subject it to shock or allow
it to be dropped. If it is dropped, it must be
replaced.
2. Connect:
• Pocket tester
1
(to the coolant temperature sensor)
NOTE:
Set the tester selector to the “
Ω ×
1k” position.
3. Immerse the coolant temperature sensor 2 in
coolant
3
and check the coolant temperature
sensor operation.
4 Temperature gauge
CAUTION:
Never heat the coolant to a temperature of
120 °C (248 °F) or more.
4. If the coolant temperature sensor operation is
defective, replace it.
Coolant temperature sensor resis-
tance:
5.21 ~ 6.37 k
Ω
at 0 °C (32 °F)
0.290 ~ 0.354 k
Ω
at 80 °C (176 °F)
0.170 ~ 0.208 k
Ω
at 100 °C (212 °F)
1