Yamaha XVS950CU 2014, Service Manual

Page: 387 / 580

THROTTLE BODIES
6-10
e. Start the engine.
f. Measure the fuel pressure.
g. Use the vacuum/pressure pump gauge set to
adjust the fuel pressure in relation to the vac-
uum pressure as described below.
TIP
The vacuum pressure should not exceed 100
kPa (760 mmHg).
Faulty
→
Replace the fuel pump and pres-
sure regulator.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
EAS27030
ADJUSTING THE THROTTLE POSITION
SENSOR
1. Check:
• Throttle position sensor
Refer to “CHECKING THE THROTTLE PO-
SITION SENSOR” on page 7-167.
2. Adjust:
• Throttle position sensor angle
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a. Connect the Test harness-TPS(3P) “1” to the
throttle position sensor and wire harness as
shown.
b. Connect the digital circuit tester to the Test
harness-TPS(3P).
c. Turn the main switch to “ON”.
d. Measure the throttle position sensor output
voltage.
e. Adjust the throttle position sensor angle so
that the output voltage is within the specified
range.
f. After adjusting the throttle position sensor an-
gle, tighten the throttle position sensor
screws “2”.
Vacuum/pressure pump gauge
set
90890-06756
Mityvac brake bleeding tool
YS-42423
Pressure gauge
90890-03153
YU-03153
Fuel pressure adapter
90890-03176
YM-03176
Fuel line pressure at idling
220 – 300 kPa (2.20 – 3.00
kgf/cm², 31.3 – 42.7 psi)
4
1
3
2
6
5
1
4
5
2
3
6
• Increase the vacuum pressure
→
Fuel pressure is decreased
• Decrease the vacuum pressure
→
Fuel pressure is increased
• Positive tester probe
→
yellow (wire harness color)
• Negative tester probe
→
black/blue (wire harness color)
Digital circuit tester
90890-03174
Model 88 Multimeter with ta-
chometer
YU-A1927
Test harness– TPS (3P)
90890-03204
YU-03204
Output voltage (at idle)
0.63–0.73 V