Troubleshooting - Yamaha YFM7FGPW Service Manual

TROUBLESHOOTING

The fuel pump fails to operate.
Check:
1. main, ignition, and fuel injection system
fuses
2. battery
3. main switch
4. engine stop switch
5. fuel injection system relay
6. fuel pump
7. wiring connections
(the entire fuel pump system)
NOTE:
_
• Before troubleshooting, remove the following
part(s):
1. seat
2. battery cover
3. rear fender
• Troubleshoot with the following special
tool(s).
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
EBS01043
1. Main, ignition, and fuel injection system
fuses
• Check the main, ignition, and fuel injection
system fuses for continuity.
Refer to "CHECKING THE FUSES" in
chapter 3.
• Are the main, ignition, and fuel injection
system fuses OK?
YES
FUEL PUMP SYSTEM
NO
Replace the fuse(s).
9 - 51
EBS01044
2. Battery
• Check the condition of the battery.
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20 °C (68 °F)
• Is the battery OK?
YES
EBS01041
3. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
YES
4. Engine stop switch
• Check the engine stop switch for continu-
ity.
Refer to "CHECKING THE SWITCHES".
• Is the engine stop switch OK?
YES
– +
ELEC
NO
• Clean the battery
terminals.
• Recharge or
replace the battery.
NO
Replace the main
switch.
NO
Replace the left han-
dlebar switch.