Yamaha WR250F(P), Owner'S Service Manual

Page: 630 / 694

6 - 10
– +
ELEC
THROTTLE POSITION SENSOR SYSTEM
5. Adjust:
●
Engine idling speed
Refer to “ENGINE IDLING SPEED
ADJUSTMENT” section in the CHAP-
TER 3.
6. Insert the thin electric conductors 2
(lead) into the throttle position sensor
coupler
1 , as shown, and connect the
tester to them.
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.
Tester (+) lead
→
Yellow lead 3
Tester (–) lead
→
Black lead 4
7. Start the engine.
8. 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 posi-
tion sensor
output voltage
Tester selector
position
0.58 ~ 0.78 V DCV