Yamaha VMX12 2001, Service Manual

Page: 442 / 454

8 - 50
– +
ELEC
FUEL PUMP SYSTEM
YES NO
YES
NO
YES
NO
YES NO
5. Fuel reserve switch
• Check the fuel reserve switch for continuity.
Refer to “CHECKING THE SWITCHES”.
• Is the fuel reserve switch OK?
Replace the fuel
reserve switch.
6. Fuel level indicator light bulb and socket
• Check the fuel level indicator light bulb and
socket for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
• Are the fuel level indicator light bulb and
socket OK?
Replace the fuel level
indicator light bulb,
socket or both.
7. Fuel sender
• Drain the fuel from the fuel tank and remove
the fuel sender from the fuel tank.
• Disconnect the fuel sender coupler from the
wire harness.
• Connect the pocket tester (
Ω ×
1) to the fuel
sender coupler as shown.
Positive tester probe
→
green
1
Negative tester probe
→
black
2
• Measure the fuel sender resistances.
Fuel sender resistance
(
Ω ×
100)
700 ~ 1,100
Ω
at 25 °C
• Is the fuel sender OK?
Replace the fuel
sender.
8. Fuel pump relay
• Connect the pocket tester (DC 20 V) to the
fuel pump relay as shown.
Positive tester probe
→
blue/black
1
Negative tester probe
→
black
2
• Start the engine.
• Measure the fuel pump relay output volt-
age.
Fuel pump relay output voltage
12 V
• Is the fuel pump control unit OK?
Replace the fuel
pump relay.