Yamaha YFZ450S 2003 Service Manual page 359

2. Neutral switch
• Check the neutral switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the neutral switch OK?
YES
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?
YES
This circuit is OK.
NO
Replace the neutral
switch.
NO
The wiring circuit
from the main switch
to the indicator light
coupler is faulty and
must be repaired.
SIGNAL SYSTEM
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)).
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?
8 - 36
ELEC
YES
Replace the coolant
temperature warning
light bulb, socket or
both.
– +
NO