Yamaha YZ450F(Y) Instrukcja Obsługi Pobierz pdf (Strona 193)

7-7

THROTTLE POSITION SENSOR SYSTEM

HANDLING NOTE

Do not loosen the screw (throttle

position sensor) "1" except when

changing the throttle position sen-

sor due to failure because 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

1. Inspect:

• Throttle position sensor resis-

tance

Out of specification → Replace.

2. Inspect:

• Throttle position sensor variable

resistance

Check that the resistance in in-

creased as the throttle grip is

moved from the full close position

to the full open position.

Out of specification → Replace.

CHANGING AND ADJUSTING THE

THROTTLE POSITION SENSOR

1. Remove:

• Throttle position sensor coupler

2. Remove:

• Screw (throttle position sensor)

"1"

• Throttle position sensor "2"

Loosen the screw (throttle position

sensor) using the T25 bit.

3. Replace:

• Throttle position sensor

4. Install:

• Throttle position sensor "1"

• Screw (throttle position sensor)

"2"

• Align the projection "b" on the throt-

tle body with the slot "a" in the throt-

tle position sensor.

• Temporarily tighten the screw

(throttle position sensor).

5. Make sure that the throttle grip is

in the fully closed position.

6. Install:

• Throttle position sensor coupler

7. Connect the FI diagnostic tool.

(Refer to "CONNECTING THE FI

DIAGNOSTIC TOOL".)

8. Set the FI diagnostic tool to the di-

agnostic mode, and then select

diagnostic code No. D01. (Refer

to "SETTING THE DIAGNOSTIC

MODE".)

9. Adjust the position of the throttle

position sensor so that the angle

displayed on the LCD of the FI di-

agnostic tool is 12–21°.

10. After adjusting the throttle posi-

tion sensor angle, tighten the

throttle position sensor screw "1".

Tighten the screw (throttle position

sensor) using the T25 bit.

Tester (+) lead → Blue lead "1"

Tester (-) lead → Black lead "2"

Throttle po-

sition sen-

sor coil

resistance

Tester se-

lector posi-

tion

4–6 kΩ at

20°C (68 °F)

kΩ×1

Y

B

L

Tester (+) lead → Yellow lead "1"

Tester (-) lead → Black lead "2"

Throttle position

sensor coil vari-

able resistance

Tester

selec-

tor po-

sition

Full

closed

Full

opened

kΩ×1

Zero

–2

kΩat

20°C

(68°F)

4–6

kΩat

20°C

(68°F)

Y

B

L

Screw (throttle position

sensor)

3 Nm (0.3 m•kg, 2.2

ft•lb)

1 2 ... 188 189 190 191 192 193 194 195 196 197 198 ... 229 230

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