Yamaha YZ250F Owner's Service Manual page 278

THROTTLE POSITION SENSOR SYSTEM
1
9. Tighten:
• Screw (throttle position sensor) 1
NOTE:
Tighten the screws (throttle position sensor)
using the T25 bit.
10. Stop the engine.
THROTTLE POSITION SENSOR INPUT
VOLTAGE INSPECTION
1. Disconnect the throttle position sensor cou-
pler.
2. Start the engine.
3. Inspect:
• Throttle position sensor input voltage
Out of specification → Replace the CDI
unit.
Tester (+) lead → Blue lead 1
Tester (–) lead → Black/Blue lead 2
Throttle posi-
tion sensor
input voltage
4 ~ 6 V
6 - 11
ELEC
– +
Tester selector
position
DCV-20