Yamaha XP500 Service Manual page 527

EAS00806
8. The speedometer fails to operate.
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
• Set the main switch to "ON".
• Start the engine.
• Elevate the front wheel and slowly rotate
it.
• Measure the voltage (DC 5 V) of white and
black/blue. With each full rotation of the
front wheel, the voltage reading should
cycle from 0.6 V to 4.8 V to 0.6 V to 4.8 V.
• Does the voltage reading cycle correctly?
YES
NO
Replace the speed
sensor.
SIGNALING SYSTEM
2. Voltage
• Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness
side) as shown.
Positive tester probe → yellow/blue 1
Negative tester probe → black/white 2
• Set the main switch to "ON".
• Measure the voltage (DC 5 V) yellow/blue
1 on the meter assembly coupler (wire
harness side).
• Is the voltage within specification?
This circuit is OK.
8 - 49
ELEC
YES
Replace the meter
assembly.
– +
NO