Yamaha 2011 WR250FA, Owner'S Service Manual

Page: 306 / 316

7-18
THROTTLE POSITION SENSOR SYSTEM
HANDLING NOTE
Do not loosen the screw (throttle position
sensor) "1" except when changing the
throttle position sensor due to failure be-
cause it will cause a drop in engine perfor-
mance.
CHECKING THE COUPLERS AND LEADS
CONNECTION
1. Check:
• Couplers and leads connection
Rust/dust/looseness/short-circuit
→
Repair
or replace.
CHECKING THE THROTTLE POSITION
SENSOR COIL
1. Inspect:
• Throttle position sensor coil resistance
Out of specification
→
Replace.
2. Loosen:
• Throttle stop screw "1"
Turn out the throttle stop screw until the throttle
shaft is in the full close position.
3. Inspect:
• Throttle position sensor coil variable resis-
tance
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
→
Blue lead "1"
Tester (-) lead
→
Black lead "2"
Throttle position
sensor coil resis-
tance
Tester selector
position
4–6 k
Ω
at 20°C
(68 °F)
k
Ω
×1
Tester (+) lead
→
Yellow lead "1"
Tester (-) lead
→
Black lead "2"
Throttle position sen-
sor coil variable resis-
tance
Tester se-
lector posi-
tion
Full closed
Full
opened
k
Ω
×1
Zero –3
k
Ω
at 20°C
(68 °F)
4–6 k
Ω
at
20 °C (68
°F)