Yamaha YZ426F(M)/LC Owner's Service Manual page 556

TPS (THROTTLE POSITION SENSOR) SYSTEM
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.
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
NOTE:
Turn out the throttle stop screw until the throt-
tle shaft is in the full close position.
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 posi-
tion.
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)
6 - 8
–
ELEC
Tester selector
position
kΩ × 1
Tester selec-
tor position
kΩ × 1
4 ~ 6 kΩ at
20 ˚C
(68 ˚F)
+