Yamaha WR450F(T) Owner's Service Manual page 702

TPS (THROTTLE POSITION SENSOR) SYSTEM
1
8. Tighten:
• Screw (TPS) 1
9. Stop the engine.
EC694000
TPS INPUT VOLTAGE INSPECTION
1. Disconnect the TPS coupler.
2. Start the engine.
3. Inspect:
• TPS input voltage
Out of specification → Replace the CDI
unit.
Tester (+) lead → Blue lead 1
Tester (–) lead → Black/Blue lead 2
TPS input
voltage
4 ~ 6 V
6 - 23
– +
ELEC
Tester selector
position
DCV-20