Yamaha YZ250F(W) Owner's Service Manual page 624

THROTTLE POSITION SENSOR SYSTEM
a
10. Put the aligning marks a on the TPS and
carburetor.
11. Stop the engine.
12. Remove the carburetor.
13. Tighten:
• Screw (throttle position sensor) 1
NOTE:
Tighten the screws (throttle position sensor)
1
using the T25 bit.
14. Install the carburetor.
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
6 - 10
ELEC
Throttle posi-
Tester selector
tion sensor
input voltage
4 ~ 6 V
– +
position
DCV-20