Yamaha YZ450FA 2011 Owner's Service Manual page 272

3. Replace:
• Throttle position sensor
4. Install:
• Throttle position sensor "1"
• Screw (throttle position sensor) "2"
• Align the projection "b" on the throttle body
with the slot "a" in the throttle position sensor.
• Temporarily tighten the screw (throttle posi-
tion sensor).
5. Make sure that the throttle grip is in the fully
closed position.
6. Install:
• Throttle position sensor coupler
7. Connect the FI diagnostic tool. (Refer to
"CONNECTING THE FI DIAGNOSTIC
TOOL".)
8. Set the FI diagnostic tool to the diagnostic
mode, and then select diagnostic code No.
D01. (Refer to "SETTING THE DIAGNOS-
TIC MODE".)
9. Adjust the position of the throttle position
sensor so that the angle displayed on the
LCD of the FI diagnostic tool is 12–21°.
10.After adjusting the throttle position sensor
angle, tighten the throttle position sensor
screw "1".
Tighten the screw (throttle position sensor) us-
ing the T25 bit.
Screw (throttle position sensor)
3 Nm (0.3 m•kg, 2.2 ft•lb)
THROTTLE POSITION SENSOR SYSTEM
CHECKING THE THROTTLE POSITION
SENSOR INPUT VOLTAGE
1. Disconnect the throttle position sensor cou-
pler.
2. Connect the test harness-speed sensor (3P)
"1" as shown.
3. Start the engine.
4. Inspect:
• Throttle position sensor input voltage
Out of specification → Replace the ECU.
Tester (+) lead → Blue lead "1"
Tester (-) lead → Black/Blue lead "2"
7-10
Test harness-speed sensor (3P)
YU-03208/90890-03208
Throttle position
Tester selector
sensor input
voltage
4–6 V
position
DCV-20