Fuel Control Units And Components; Checking The Water Detection Switch - Yamaha F150B Service Manual

ELEC
Fuel control units and
components

Checking the water detection switch

1. Disconnect the water detection switch
coupler a.
2. Turn the engine start switch to "ON," and
then measure the input voltage at the
water detection switch coupler.
a
Water detection switch input voltage:
Blue/White (L/W)–Black (B)
4.75–5.25 V
3. Turn the engine start switch to "OFF," and
then remove the filter cup assembly.
4. Before checking the water detection
switch, make sure that the float a is able
to move smoothly.
5. Check the water detection switch for conti-
nuity with the float in positions A and B .
NOTICE: Make sure not to remove the
clip b and float a.
A
b
c
5-23
Electrical system
L/W
B
b
a
B
b
Float
position
A
B
Float height d (reference data):
40.0 mm (1.57 in)
6. Remove the junction box cover, and then
disconnect the engine ECM coupler e.
e
7. Check the wiring harness for continuity.
a
e
Wiring harness continuity:
Terminal 1–Terminal 5
Terminal 2–Terminal 8
a
d
c
b
Terminal
b c
8 5