Yamaha WR250FR Owner's Service Manual page 317

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THROTTLE POSITION SENSOR SYSTEM
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4. Adjust:
• Engine idling speed
Refer to "ENGINE IDLING SPEED
ADJUSTMENT" section in the CHAPTER
3.
5. Insert the thin electric conductors 2 (lead)
into the throttle position sensor coupler 1,
as shown, and connect the tester to them.
Tester (+) lead → Yellow lead 3
Tester (–) lead → Black lead 4
CAUTION:
• Do not insert the electric conductors
more than required because it may
reduce the waterproof function of the
coupler.
• Make sure that a short-circuit does not
develop between the terminals because it
may cause damage to electrical compo-
nents.
6. Start the engine.
7. Adjust:
• Throttle position sensor output voltage
Adjustment steps:
Adjust the installation angle of the throttle
position sensor 1 to obtain the specified
output voltage.
NOTE:
Measure the output voltage accurately with a
digital electronic voltmeter that gives an easy
reading of a small voltage.
Throttle position
sensor output
voltage
0.58 ~ 0.78 V
6 - 22
+
ELEC
Tester selector
position
DCV

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