Checking The Thermoswitch - Yamaha F150B 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 slowly heat the
water.
6. Measure the engine temperature sensor
resistance. Replace if out of specifica-
tion.
Engine temperature sensor resistance
(reference data):
54.2–69.0 kΩ at 20 °C (68 °F)
3.12–3.48 kΩ at 98 °C (208 °F)
7. Install the engine temperature sensor.
8. Remove the junction box cover, and then
disconnect the engine ECM coupler b.
B B/Y
Ignition units and components
b
9. Check the wiring harness for continuity.
a
b
35
Wiring harness continuity:
Terminal 1–Terminal 35
Terminal 2–Terminal 8
10. Connect the engine ECM coupler b, and
then install the junction box cover.
11. Connect the engine temperature sensor
coupler a.

Checking the thermoswitch

1. Disconnect the thermoswitch connectors.
0
1
2
3
4
8
5
6
7
8
9
10
A
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