Yamaha 2002 CS50, Service Manual, Page: 191 / 204

ELEC
SIGNALING SYSTEM
8-32
• Set the main switch to “ON”.
• Set the turn signal switch to “L” or “R”.
• Measure the voltage (DC 12 V) of the cho-
colate or dark green 2 at the turn signal
light connector (wire harness side).
• Is the voltage within specification?
EAS00802
4. The oil level warning light fails to come on.
1. Oil level warning light bulb and socket
• Check the oil level warning light bulb and
socket for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”
• Are the oil level warning light bulb and soc-
ket OK?
2. Engine oil level switch
• Drain the engine oil and remove the engine
oil level switch from the oil pan.
• Check the engine oil level switch for conti-
nuity.
Refer to “CHECKING THE SWITCHES”.
• Is the engine oil level switch OK?
3. Voltage
• Connect the pocket tester (DC 20 V) to the
meter coupler (wire harness side) as
shown.
Positive tester probe green/yellow
Negative tester probe black
• Set the main switch to “ON”.
• Measure the voltage (DC 12 V) of
green/yellow and black at the meter
coupler.
• Is the voltage within specification?
EAS00804
5. The fuel level gauge fails to operate.
1. Fuel sender
• Remove the fuel sender from the fuel tank.
• Connect the pocket tester to the fuel sen-
der coupler (wire harness side) as shown.
Positive tester probe green
Negative tester probe sky blue
The wiring circuit
from the turn signal
switch to the turn
signal light connec-
tor is faulty and
must be repaired. This circuit is OK.
Replace the oil level
warning light bulb,
socket or both.
Replace the engine
oil level switch.
L Y
Br
Ch Dg
R B
Gy GR
BY Sb G LG
Dg Ch L GR Y Gy
R Br B BY Sb G
RY
RY LG
1
2
B
G
/
Y
The wiring circuit
from the main
switch to the meter
coupler is faulty
and must be
repaired.
This circuit is OK.
1
2
G Sb
YES
NO
YES
NO
YES
NO
YES
NO