Yamaha YFM7FGPW Service Manual page 448

2. Voltage
• Connect the pocket tester (DC 20 V) to the
meter assembly coupler as shown.
Positive tester probe → brown 1
Negative tester probe → black/white 2
G/Y G/R
Y/L Br
1
• Set the main switch to "ON".
• Measure the voltage (12 V) of brown 1
and black/white 2 at the meter assembly
coupler.
• Is the voltage within specification?
YES
Replace the meter
assembly.
SIGNALING SYSTEM
Br/B
B/W
2
NO
The wiring circuit
from the main switch
to the meter assem-
bly coupler is faulty
and must be
repaired.
9 - 43
8. The speedometer fails to come on.
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
W
• 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?
YES
– +
ELEC
1
L Y / L W
B / L B / L
2
NO
Replace the speed
sensor.