Yamaha YXR70FX, Руководство по обслуживанию

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– +
ELEC
SIGNALING SYSTEM
YES NO
YES
NO
8. The speedometer fails to come on.
YES
NO
YES
NO
2. Wiring
• Check the wiring circuit from the fuel pump
to ECU (brown/white) and fuel pump to
meter assembly (orange/black).
• Is the wiring circuit properly connect and
without defects?
Properly connect or
repair the wiring cir-
cuit.
3. Voltage
• Connect the pocket tester (DC 20 V) to the
meter assembly coupler as shown.
Positive tester probe
→
brown/yellow 1
Negative tester probe
→
black/white 2
• Set the main switch to “ON”.
• Measure the voltage (12 V) of brown/yel-
low 1 and black/white 2 at the meter
assembly coupler.
• Is the voltage within specification?
Replace the meter
assembly. The wiring circuit
from the main switch
to the meter assem-
bly coupler is faulty
and must be
repaired.
Y / L Br / Y B / W
Y / L Br / Y B / W
O / B R / W
O / B R / W
2 1
1. Speed sensor
• Connect the pocket tester (DC 20 V) to the
speed sensor coupler (wire harness side)
as shown.
Positive tester probe
→
white
1
Negative tester probe
→
black/blue
2
• Turn the main switch to “ON”.
• Elevate the rear wheels and slowly rotate
them.
• Measure the voltage of white and black/
blue. With each full rotation of the rear
wheels, the voltage reading should cycle
from 0.6 V to 4.8 V to 0.6 V to 4.8 V.
• Is the speed sensor OK?
Replace the speed
sensor.
2. Wiring
• Check the wiring circuit from the speed
sensor to ECU and ECU to meter assem-
bly (yellow/blue).
• Is the wiring circuit properly connect and
without defects?
Properly connect or
repair the wiring cir-
cuit.
L L
L
Y
/
/ /
1
2
W W
B L B