Yamaha YBR125ED 2005 Service Manual page 299

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
sender coupler (wire harness side) as
shown.
Positive tester probe → green 1
Negative tester probe → black 2
È
É
• Measure the fuel sender resistances.
Fuel sender resistance (up posi-
tion "full" È)
(Ω × 1)
4 ~ 10 Ω at 20 °C (68 °F)
Fuel sender resistance (down
position "empty" É)
(Ω × 10)
90 ~ 100 Ω at 20 °C (68 °F)
• Is the fuel sender OK?
YES
1
G G
B B
2
NO
Replace the fuel
sender.
SIGNALING SYSTEM
2. Voltage
• Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness
side) as shown.
Positive tester probe → brown 1
Negative tester probe → green 2
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of brown
1 on the meter assembly coupler (wire
harness side).
• Is the voltage within specification?
7 - 40
ELEC
2
G G
Sb
B B
Br L L
YES
Check the
connections of the
entire signaling sys-
tem.
– +
Sb
Br
1
NO
wiring