Yamaha WR250FM service manual Coil variable resistance, At 20 C 68 F

THROTTLE POSITION SENSOR SYSTEM

ELEC

–+

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 position. Out of specification → Replace.

Tester (+) lead → Yellow lead 1

Tester (–) lead → Black lead 2

Throttle position sensor		Tester
		selector
coil variable resistance
		position
Full closed	Full opened
Zero ~ 3 kΩ	4 ~ 6 kΩ	kΩ ⋅ 1
at 20 °C	at 20 °C
(68 °F)	(68 °F)

21

THROTTLE POSITION SENSOR REPLACEMENT AND ADJUSTMENT

1.Remove:

•Throttle position sensor coupler

•Screw (throttle position sensor) 1

•Throttle position sensor 2

NOTE:

Loosen the screws (throttle position sensor) using the T25 bit.

2.Replace:

• Throttle position sensor

1 2

b a

3.Install:

•Throttle position sensor 1

•Screw (throttle position sensor) 2

•Throttle position sensor coupler

NOTE:

•Align the slot a in the throttle position sensor with the projection b on the carburetor.

•Temporarily tighten the screws (throttle posi- tion sensor).

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