Yamaha YP400T Service Manual page 373

EAS00803
5. The engine oil change indicator fails to
come on.
1. Engine oil change indicator bulb and
socket
• Check the engine oil change indicator bulb
and socket for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the engine oil change indicator bulb
and socket OK?
YES
Replace the meter
assembly.
SIGNALING SYSTEM
NO
Replace the engine
oil change indicator
bulb, socket or both.
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EAS00806
6. 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 → blue 2
• Set the main switch to "ON".
• Elevate the front wheel and slowly rotate
it.
• Measure the voltage (DC 5 V) of white and
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
– +
ELEC
NO
Replace the speed
sensor.