Yamaha 2003 YFZ450S, Service Manual

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ELEC
SIGNAL SYSTEM
YES
NO
YES
NO
EBS01083
3. The coolant temperature warning light does
not come on when the start switch is
pushed on, or if the coolant temperature
warning light does not come on when the
temperature is high (more than 117 ~
123 °C (242.6 ~ 253.4 °F)).
YES
NO
2. Neutral switch
• Check the neutral switch for continuity.
Refer to “CHECKING THE SWITCHES”.
• Is the neutral switch OK?
Replace the neutral
switch.
3. Voltage
• Connect the pocket tester (DC 20 V) to the
indicator light coupler (wire harness side)
as shown.
Positive tester probe
→
brown
1
Negative tester probe
→
sky blue
2
• Set the main switch to “ON”.
• Measure the voltage (DC 12 V).
• Is the voltage within specification?
This circuit is OK. The wiring circuit
from the main switch
to the indicator light
coupler is faulty and
must be repaired.
1. Coolant temperature warning light bulb
and socket
• Check the coolant temperature warning
light bulb and socket for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
• Are the coolant temperature warning light
bulb and socket OK?
Replace the coolant
temperature warning
light bulb, socket or
both.