Yamaha XV19SX(C) Service Manual page 481

• Positive tester probe →
blue "1"
• Negative tester probe →
black "2"
2
B Y
b. Measure the throttle position sensor maxi-
mum resistance.
L LLL L LLL L L LLL L L LLL L
3. Install:
• Throttle position sensor
NOTE:
When installing the throttle position sensor, ad-
just its angle properly. Refer to "ADJUSTING
THE THROTTLE POSITION SENSOR" on page
6-16.
EAS28350
CHECKING THE FUEL PUMP
EWA13850
WARNING
Gasoline is extremely flammable and under
certain circumstances there can be a danger
of an explosion or fire. Be extremely careful
and note the following points:
• Stop the engine before refueling.
• Do not smoke, and keep away from open
flames, sparks, or any other source of fire.
• If you do accidentally spill gasoline, wipe it
up immediately with dry rags.
• If gasoline touches the engine when it is
hot, a fire may occur. Therefore, make sure
the engine is completely cool before per-
forming the following test.
1. Disconnect:
• Fuel pump coupler
(from the fuel pump)
2. Check:
• Fuel pump operation
Faulty/rough movement → Replace.
M MMM M MMM M M MMM M M MMM M
a. Fill the fuel tank.
b. Put the end of the fuel hose "1" into an open
container.
1
L
L LLL L L LLL L LLL
M MMM M M MMM M MMM
7-90
ELECTRICAL COMPONENTS
c. Connect the battery (DC 12 V) to the fuel
pump terminals as shown.
• Positive battery lead →
red/blue "2"
• Negative battery lead →
black "3"
3
1
d. Check the fuel pump operation.
L LLL L LLL L L LLL L L LLL L
EAS28360
CHECKING THE EXUP SERVO MOTOR
1. Check:
• EXUP servo motor operation
Out of specification → Replace.
M MMM M MMM M M MMM M M MMM M
a. Disconnect the EXUP cables from the EXUP
servo motor pulley.
b. Disconnect the EXUP servo motor coupler
from the wire harness.
c. Connect the battery leads to the EXUP servo
motor terminals as shown.
For counterclockwise rotation "a"
• Positive battery lead →
black/green "1"
• Negative battery lead →
black/red "2"
For clockwise rotation "b"
• Positive battery lead →
black/red "2"
• Negative battery lead →
black/green "1"
b
a
d. Check that the EXUP servo motor pulley ro-
tates several times in directions "a" and "b".
2
L LLL L L LLL L LLL
M MMM M M MMM M MMM
1 2
L W/R B/L
B/G B/R