Yamaha YZ450F, Owner'S Service Manual

Page: 594 / 650

6 - 8
– +
ELEC
TPS (THROTTLE POSITION SENSOR) SYSTEM
HANDLING NOTE
CAUTION:
Do not loosen the screws {TPS (throttle
position sensor)}
1
except when changing
the TPS (throttle position sensor) due to
failure because it will cause a drop in
engine performance.
1
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
• Couplers and leads connection
Rust/dust/looseness/short-circuit
→
Repair or replace.
TPS COIL INSPECTION
1. Inspect:
• TPS coil resistance
Out of specification
→
Replace.
2. Loosen:
• Throttle stop screw
1
NOTE:
Turn out the throttle stop screw until the throt-
tle shaft is in the full close position.
Tester (+) lead
→
Blue lead
1
Tester (–) lead
→
Black lead
2
TPS coil
resistance
Tester selector
position
4 ~ 6 k
Ω
at
20 °C (68 °F)
k
Ω ×
1