Yamaha WR250F Manuel D'atelier page 632

THROTTLE POSITION SENSOR SYSTEM
9. Tighten:
Screw (throttle position sensor) 1
G
NOTE:
Tighten the screws (throttle position sensor)
using the T20 bit (tamper resistant fastener
type).
10. Stop the engine.
THROTTLE POSITION SENSOR INPUT
VOLTAGE INSPECTION
1. Disconnect the throttle position sensor
coupler.
2. Start the engine.
3. Inspect:
Throttle position sensor input voltage
G
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