Yamaha YZ450FT Owner's Service Manual page 282

TPS (THROTTLE POSITION SENSOR) SYSTEM
2
1
1
2
b a
3. Inspect:
• TPS coil variable resistance
Check that the resistance in increased as
the throttle grip is moved from the full
close position to the full open position.
Out of specification → Replace.
Tester (+) lead → Yellow lead 1
Tester (–) lead → Black lead 2
TPS coil variable
resistance
Full closed Full opened
0 ~ 2 kΩ
at 20 °C
(68 °F)
TPS REPLACEMENT AND ADJUSTMENT
1. Remove:
• TPS coupler
• Screw (TPS) 1
• TPS 2
NOTE:
Loosen the screws (TPS) using the T25 bit.
2. Replace:
• TPS
3. Install:
• TPS 1
• Screw (TPS) 2
• TPS coupler
NOTE:
• Align the slot a in the TPS with the projec-
tion b on the carburetor.
• Temporarily tighten the screws (TPS).
6 - 9
– +
ELEC
Tester selec-
tor position
kΩ × 1
4 ~ 6 kΩ
at 20 °C
(68 °F)