Yamaha YZ450F, Owner'S Service Manual

Page: 596 / 650

6 - 9
– +
ELEC
TPS (THROTTLE POSITION SENSOR) SYSTEM
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
Tester selec-
tor position
Full closed Full opened
k
Ω ×
1
0 ~ 2 k
Ω
at 20 °C
(68 °F)
4 ~ 6 k
Ω
at 20 °C
(68 °F)
TPS REPLACEMENT AND ADJUSTMENT
1. Remove:
• TPS coupler
• Carburetor
2. Remove:
• Screw (TPS)
1
• TPS
2
NOTE:
Loosen the screws (TPS) using the T25 bit.
3. Replace:
• TPS
4. Install:
• TPS
1
• Screw (TPS)
2
NOTE:
• Align the slot
a
in the TPS with the projec-
tion
b
on the carburetor.
• Temporarily tighten the screws (TPS).
5. Install:
• Carburetor
• TPS coupler
2
1
b a
2
1