Adjusting The Throttle Position Sensor - Yamaha F150A Service Manual

FUEL
5. Turn the synchronizing screw 5 so that
the vacuum pressure of cylinder #3 or #4
is within 4 kPa (30 mmHg) based on the
vacuum pressure of cylinder #1 or #2.
b
5
Vacuum pressure is
Direction a
increase.
Vacuum pressure is
Direction b
decrease.
Example
Check results:
Cylinder #1
kPa 49
(mmHg) (370)
Adjust the difference of the vacuum pressure
between cylinders #1 and #4 within 4 kPa (30
mmHg).
Check results:
Cylinder #1
kPa 49
(mmHg) (370)
Adjust the difference of the vacuum pressure
between cylinders #2 and #4 within 4 kPa (30
mmHg).
Adjusting the throttle position
sensor
NOTE:
• Be sure to adjust the throttle valve's open-
ing before measuring the throttle position
sensor output voltage.
• When measuring the throttle position sen-
sor output voltage, set the digital tester to
the manual range.
4-17
Fuel system
a
S63P4230
#2 #3 #4
48 45 44
(360) (340) (330)
#2 #3 #4
48 52 53
(360) (390) (400)
1. Remove the intake silencer.
2. Disconnect the throttle joint link rod 1
from the throttle lever 1.
1
3. Check that the throttle valves are in the
fully closed position.
4. Connect the test harness (3 pins) to the
throttle position sensor.
Test harness (3 pins): 90890-06793
5. Turn the engine start switch to ON.
6. Measure the throttle position sensor out-
put voltage with the throttle valves fully
closed. If the output voltage is out of
specification, adjust the throttle position
sensor.
S63P4260
S63P4270
S63P8130
63P3F11