Yamaha YZ450F(S) Owner's Service Manual page 582

TPS (THROTTLE POSITION SENSOR) SYSTEM
1
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.
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
Couplers and leads connection
G
Rust/dust/looseness/short-circuit →
Repair or replace.
TPS COIL INSPECTION
1. Inspect:
TPS coil resistance
G
Out of specification → Replace.
Tester (+) lead → Blue lead 1
Tester (–) lead → Black lead 2
TPS coil
resistance
4 ~ 6 kΩ at
20 ˚C (68 ˚F)
2. Loosen:
Throttle stop screw 1
G
NOTE:
Turn out the throttle stop screw until the throt-
tle shaft is in the full close position.
6 - 8
– +
ELEC
Tester selector
position
kΩ × 1