Yamaha 2004 WR250FS Owner's Service Manual page 319

THROTTLE POSITION SENSOR SYSTEM
1
8. Tighten:
• Screw (throttle position sensor) 1
9. 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 position
sensor input
voltage
4 ~ 6 V
6 - 23
– +
ELEC
Tester selector
position
DCV-20