- Sub-throttle position sensor (from the throttle body)
2. Check:
- Sub-throttle position sensor
a. Disconnect the sub-throttle motor coupler.
b. Disconnect the sub-throttle position sensor coupler.
c. Remove the sub-throttle position sensor from the sub-throttle servo motor.
d. Connect the pocket tester (Ωx1k) to the sub-throttle position sensor as shown.
Pocket tester: 90890-03112.
Analog pocket tester: YU-03112-C.
Tester positive lead → Blue «1»
Tester negative lead → Black/Blue «2»
e. Check the throttle position sensor maximum resistance.
Out of specification → Replace the throttle position sensor.
Maximum sub-throttle position sensor resistance: 4-6 kΩ at 20°C (68°F).
f. Connect the pocket tester (Ωx1k) to the throttle position sensor as shown.
Tester positive lead → Green/Yellow «3»
Tester negative lead → Black/Blue «2»
![](https://motoinstruction.ru/img/yamaha/3/112316.jpg)
g. While slowly opening the sub-throttle worm nut, check that the sub-throttle position sensor resistance is within the specified range.
The resistance does not change or it changes abruptly → Replace the sub-throttle position sensor.
Note: Check mainly that the resistance changes gradually when turning the sub-throttle worm nut, since the readings (from closed to wide-open sub-throttle) may differ slightly from those specified.
Throttle position sensor resistance: 0-6 kΩ at 20°C (68°F).
![](https://motoinstruction.ru/img/yamaha/3/112317.jpg)
3. Install:
- Sub-throttle position sensor
Note: When installing the throttle position sensor, adjust its angle properly. Refer to «Checking the sub-throttle position sensor».