Yamaha XF50W Service Manual page 322

EAS00804
4. The fuel level meter fails to operate.
1. Fuel sender
• Remove the fuel pump from the fuel tank.
• Connect the pocket tester
sender coupler (wire harness side) as
shown.
Positive tester probe
Negative tester probe
1
• Measure the fuel sender resistances.
if
Fuel sender resistance (up position
"F")( × 1)
4~10 at 20°C (68°F)
Fuel sender resistance (down posi-
tion "E")(
90~100
• Is the fuel sender OK?
YES
V
(Q x1) to the fuel
-> green ©
-> black
× 10)
at 20°C (68°F)
NO
4
Replace the fuel pump.
SIGNALING SYSTEM
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
DC20V
©
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of brown
on the meter light coupler (wire harness
side).
• Is the voltage within specification?
YES
V
8-40
ELEC
-> brown ©
-> black
C D
^ n
G G
Br
g
G/W Lg- Lg G/W
B B/G B/G B
d)
4
NO
Check the wiring con-
nections of the entire
signaling system.
Refer to "CIRCUIT DIA-
GRAM".
+i
Br
(T)