Yamaha 2009 XP500Y TMAX Service Manual page 293

EAS26980
CHECKING THE INJECTORS
1. Check:
• Injectors
Damage → Replace.
EAS26990
CHECKING THE THROTTLE BODY
1. Check:
• Throttle body
Cracks/damage → Replace the throttle body.
2. Check:
• Fuel passages
Obstructions → Clean.
M MMM M MMM M M MMM M M MMM M
a. Wash the throttle body in a petroleum- based
solvent.
Do not use any caustic carburetor cleaning
solution.
b. Blow out all of the passages with compressed
air.
L LLL L LLL L L LLL L L LLL L
EAS27020
ADJUSTING THE THROTTLE POSITION
SENSOR
TIP
Before adjusting the throttle position sensor, the
engine idling speed should be properly adjusted.
1. Check:
• Throttle position sensor
Refer to "CHECKING THE THROTTLE PO-
SITION SENSOR" on page 8-77.
2. Adjust:
• Throttle position sensor angle
M MMM M MMM M M MMM M M MMM M
a. Connect the throttle position sensor coupler.
b. Connect the pocket tester (AC 20 V) to the
throttle position sensor coupler as shown.
c. Turn the main switch to "ON".
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
Yellow "1"
• Negative tester probe
Black/Blue "2"
M MMM M M MMM M MMM
L LLL L L LLL L LLL
M MMM M M MMM M MMM
7-8
THROTTLE BODY
2
B/L Y
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.
Throttle position sensor closed
position voltage
0.63–0.73 V
f. After adjusting the throttle position sensor an-
gle, tighten the throttle position sensor
screws "3".
L LLL L LLL L L LLL L L LLL L
1
L
3
L LLL L L LLL L LLL