Yamaha UMAX, Service Manual

Page: 283 / 320

ELECTRICAL COMPONENTS (YUM2E)
8-78
Main relay
CHECKING THE REVERSE BUZZER
1. Check:
• Reverse buzzer
Does not sound
→
Replace.
a. Disconnect the reverse buzzer coupler
from the wire harness.
b. Connect the battery to the reverse buzzer
coupler as shown.
c. Check the buzzer sound.
CHECKING THE THROTTLE POSITION
SENSOR
1. Remove:
• Throttle position sensor
WARNING
• Handle the throttle position sensor with
special care.
• Never subject the throttle position sensor
to strong shocks. If the throttle position
sensor is dropped, replace it.
2. Check:
• Throttle position sensor maximum resistance
Out of specification
→
Replace the throttle
position sensor.
a. Connect the digital circuit tester to the
throttle position sensor terminals as
shown.
b. Measure the throttle position sensor max-
imum resistance.
3. Install:
• Throttle position sensor
TIP
When installing the throttle position sensor, ad-
just its angle properly. Refer to “ADJUSTING
THE THROTTLE POSITION SENSOR
(YUM2E)” on page 4-27.
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between “3” and “4”)
• Positive battery terminal
→
pink “1”
• Negative battery terminal
→
black “2”
1
3
2
4
P
B
1 2
4 8 V
Resistance
0.66–1.54 k
Ω
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
• Positive tester probe
→
black “1”
• Negative tester probe
→
orange “2”
B L O