Yamaha WR250F(N) Owner's Service Manual page 622

THROTTLE POSITION SENSOR SYSTEM
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
Couplers and leads connection
Rust/dust/looseness/short-circuit
Repair or replace.
THROTTLE POSITION SENSOR COIL
INSPECTION
1. Inspect:
Throttle position sensor coil resistance
Out of specification
Tester (+) lead
Tester (–) lead
Throttle posi-
tion sensor coil
resistance
4 ~ 6 k
20 ˚C (68 ˚F)
2. Loosen:
Throttle stop screw 1
NOTE:
Turn out the throttle stop screw until the throt-
tle shaft is in the full close position.
3. Inspect:
Throttle position sensor 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
Tester (+) lead
Tester (–) lead
Throttle position sen-
sor coil variable
resistance
Full closed Full opened
Zero ~ 3 k
at 20 ˚C
(68 ˚F)
6 - 8
–
ELEC
Replace.
Blue lead 1
Black lead 2
Tester selector
position
at
k 1
Replace.
Yellow lead 1
Black lead 2
Tester
selector
position
4 ~ 6 k at
k
20 ˚C
(68 ˚F)
+
1