Yamaha F150B Service Manual - page 159
5-34
Ignition units and components
0
1
2
3
4
5
6
7
8
9
10
A
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.
7.
Install the engine temperature sensor.
8.
Remove the junction box cover, and then
disconnect the engine ECM coupler b.
9.
Check the wiring harness for continuity.
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.
Engine temperature sensor input voltage:
Black/Yellow (B/Y)–Black (B)
4.75–5.25 V
Engine temperature sensor resistance
(reference data):
54.2–69.0 k
Ω at 20 °C (68 °F)
3.12–3.48 k
Ω at 98 °C (208 °F)
a
B B/Y
Wiring harness continuity:
Terminal 1–Terminal 35
Terminal 2–Terminal 8
b
8
a
b
35