Checking The Thermoswitch - Yamaha F150A Service Manual

a
Engine temperature sensor input voltage:
Black/Yellow (B/Y)–Black (B)
4.75–5.25 V
3. Turn the engine start switch to OFF.
4. Remove the engine temperature sensor.
5. Place the engine temperature sensor in a
container of water and heat the water
slowly.
6. Measure the engine temperature sensor
resistance.
Engine temperature sensor resistance
(reference data):
128.0 kΩ at 5 °C (41 °F)
54.20–69.00 kΩ at 20 °C (68 °F)
3.120–3.480 kΩ at 100 °C (212 °F)
7. Install the engine temperature sensor.
See "Cylinder block (F150A, FL150A)"
(7-52).
8. Connect the engine temperature sensor
coupler.

Checking the thermoswitch

1. Disconnect the thermoswitch connectors.
2. Turn the engine start switch to ON, and
B/Y
B
Thermoswitch input voltage:
(reference data)
3. Turn the engine start switch to OFF.
4. Remove the thermoswitch.
5. Place the thermoswitch in a container of
6. Check the switch for continuity at the
a
a. Temperature
b. Time
5-25
Ignition unit and component
then measure the input voltage at the
thermoswitch connectors.
Pink (P)–Black (B)
11.5 V
water and heat the water slowly.
specified temperatures. Replace if out of
specification.
P B
d
d
e
c
b
P
B
d
f
c