Yamaha RS90K, Service Manual

Page: 700 / 841

8-35
– +
ELEC
SIGNAL SYSTEM
3. Measure:
• Fuel sender resistance (full
a
)
• Fuel sender resistance (empty
b
)
Out of specification
→
Replace.
Fuel sender resistance (full):
10 ~ 12
Ω
at 20 °C (68 °F)
Fuel sender resistance (empty):
179 ~ 185
Ω
at 20 °C (68 °F)
a
b
+ –
Ω ×
1
B G
SPEED SENSOR
1. Inspect:
• Speed sensor
Inspection steps:
• Connect the pocket tester (DC 20 V) to the
speed sensor coupler 1 (wire harness side) as
shown.
• Elevate the track and slowly rotate it.
• Measure the voltage (DC 5 V) of white and
chocolate. With each full rotation of the track the
voltage reading should cycle from 0.6 V to 4.8 V
to 0.6 V to 4.8 V.
Out of specification
→
Replace.
Positive tester probe
→
White
Negative tester probe
→
Chocolate
Positive battery terminal
→
Blue/Yellow
Negative battery terminal
→
Chocolate
1