Checking The Cooling System - Yamaha XF50W Service Manual

CHECKING THE COOLING SYSTEM

1. The coolant temperature indicator light fails
to come on.
1. Coolant temperature indicator light bulb and
socket
• Check the coolant temperature indicator light
bulb and socket for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS"
• Are the coolant temperature indicator light
bulb and socket OK?
YES
V
2. Voltage
• Connect the pocket tester (DC 20 V) to the
meter light coupler (wire harness side) as
shown.
Positive tester probe
Negative tester probe-»green/white(D
©
K
,—t.G/W
rrrp_
®
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of brown 1
on the meter light coupler (wire harness
side).
• Is the voltage within specification?
YES
V
I
NO
Replace the coolant
temperature indicator
light bulb, socket or both.
-> brown ©
G
Br
Br
G
Lg
G/W
Lg
B
B/ G B
B/ G
I
NO
The wiring circuit from
the main switch to the
meter light coupler is
faulty and must be re-
paired.
COOLING SYSTEM
3. Voltage
• Connect the pocket tester (DC 20 V) to the
meter light coupler (wire harness side) as
shown.
Positive tester probe
Negative tester probe-»ground
• Set the main switch to "ON".
• Measure the voltage (DC 12V) of green/
red© on the coolant temperature sensor
coupler (wire harness side).
• Is the voltage with in specification?
YES
V
8-45
-> green/red ©
4
NO
The wiring circuit from
the main switch to the
coolant temperature
sensor coupler is faulty
and must be repaired.
Refer to "CIRCUIT DIA-
GRAM".