Yamaha F30B 2018, Service Manual

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5-23
Fuel control unit and component
d. Connect the water detection switch cou-
pler.
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2. Check:
• Water detection switch continuity
Out of specification

Replace the fuel
cup assembly.
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a. Remove the fuel cup assembly. See “Fuel
filter” (6-4).
b. Check that the float “1” moves smoothly.
c. Check the water detection switch for conti-
nuity when the float “1” is in positions “A”
and “B”.
Do not remove the clip and float.
d. Install the fuel cup assembly. See “Install-
ing the fuel filter assembly” (6-7).
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Checking the fuel injector
1. Check:
• Fuel injector operation (using the YDIS
“Stationary test”)
No operating sound

Check the fuel in-
jector input voltage.
2. Measure:
• Fuel injector input voltage
Out of specification

Check the wire har-
ness for continuity.
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a. Disconnect the fuel injector couplers “a”.
b. Turn the engine start switch to ON, and
then measure the input voltage between
the fuel injector coupler terminal and
ground.
c. Turn the engine start switch to OFF.
d. Connect the fuel injector couplers.
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Water detection switch continuity
No continuity
Float position “A”
Continuity
Float position “B”
1
A
1
B
Input voltage
12 V
Red/Yellow (R/Y)–Ground
R/Y
a