Yamaha WR250F 2003 [278/304] Throttle position sensor system

6 - 10

– +

ELEC

THROTTLE POSITION SENSOR SYSTEM

4. Install:

● Throttle position sensor coupler

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.

7. Start the engine.

Tester (+) lead → Yellow lead 3

Tester (–) lead → Black lead 4

8. Adjust:

● Throttle position sensor output voltage

Adjustment steps:

Adjust the installation angle of the throttle

position sensor 1 to obtain the specified out-

put 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 out-

put voltage

Tester selector

position

0.58 ~ 0.78 V DCV