2017 YAMAHA WR 250F charging

CHARGING SYSTEM
9-13
4. AC magneto
5. Rectifier/regulator
9. Battery
10.Frame ground
11.Starter relay
12.Main fuse
50.Negative battery lead

CHARGING SYSTEM
9-14
EAS2GBB364TROUBLESHOOTING
The battery is not being charged.
TIP
Before troubleshooting, remove the following part (s):
1. Seat
2. Side cover (left/right)
1. Check the fuse.
Refer to “CHECKING THE FUSES”
on page 9-68.NG
Replace the fuse(s).
OK
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 9-69.NG 
• Clean the battery terminals.
• Recharge or replace the battery.
OK
3. Check the stator coil.
Refer to “CHECKING THE STA-
TOR COIL” on page 9-76.NG
Replace the stator assembly.
OK
4. Check the rectifier/regulator.
Refer to “CHECKING THE RECTI-
FIER/REGULATOR” on page 9-76.NG
Replace the rectifier/regulator.
OK 
5. Check the entire charging system’s
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 9-12.NG
Properly connect or repair the charging
system’s wiring.
OK
This circuit is OK.

CHARGING SYSTEM
9-15

LIGHTING SYSTEM
9-18
EAS2GBB366TROUBLESHOOTING
Any of the following fail to light: headlight or meter light.
TIP
Before troubleshooting, remove the following part (s):
1. Seat
2. Side cover (left)
3. Air scoop (left/right)
4. Fuel tank
1. Check the each bulbs condition.
Refer to “CHECKING THE BULBS
AND BULB SOCKETS” on page 9-
67.NG 
Replace the bulb (s).
OK 
2. Check the fuse.
Refer to “CHECKING THE FUSES”
on page 9-68.NG 
Replace the fuse(s).
OK 
3. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 9-69.NG 
• Clean the battery terminals.
• Recharge or replace the battery.
OK 
4. Check the main relay.
Refer to “CHECKING THE RE-
LAYS” on page 9-72.NG 
Replace the main relay.
OK 
5. Check the headlight relay.
Refer to “CHECKING THE RE-
LAYS” on page 9-72.NG 
Replace the headlight relay.
OK 
6. Check the entire lighting system’s
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 9-16.NG 
Properly connect or repair the lighting sys-
tem’s wiring.
OK 
Replace the ECU, meter assembly, or
taillight.

SIGNALING SYSTEM
9-22
EAS2GBB368TROUBLESHOOTING
• The speedometer does not operate normally.
• The fuel indicator light does not come on.
TIP
Before troubleshooting, remove the following part (s):
1. Seat
2. Side cover (left/right)
3. Air scoop (left/right)
4. Fuel tank
Check the signaling system
The speedometer fails to operate.
1. Check the fuse.
Refer to “CHECKING THE FUSES”
on page 9-68.NG 
Replace the fuse(s).
OK 
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 9-69.NG 
• Clean the battery terminals.
• Recharge or replace the battery.
OK 
3. Check the main relay.
Refer to “CHECKING THE RE-
LAYS” on page 9-72.NG 
Replace the main relay.
OK 
4. Check the entire signaling system’s
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 9-20.NG 
Properly connect or repair the signaling
system’s wiring.
OK 
This circuit is OK.
1. Check the speed sensor.
Refer to “CHECKING THE SPEED
SENSOR” on page 9-77.NG 
Replace the speed sensor.
OK 
2. Check the entire signaling system’s
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 9-20.NG 
Properly connect or repair the signaling
system’s wiring.
OK 
Replace the meter assembly.

COOLING SYSTEM
9-26
EAS2GBB371TROUBLESHOOTING
The radiator fan motor fails to turn.
TIP
Before troubleshooting, remove the following part(s):
1. Seat
2. Side cover (left)
3. Air scoop (left/right)
4. Fuel tank
1. Check the fuse.
Refer to “CHECKING THE FUSES”
on page 9-68.NG 
Replace the fuse(s).
OK 
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 9-69.NG 
• Clean the battery terminals.
• Recharge or replace the battery.
OK 
3. Check the main relay.
Refer to “CHECKING THE RE-
LAYS” on page 9-72.NG 
Replace the main relay.
OK 
4. Check the radiator fan motor.
Refer to “CHECKING THE RADIA-
TOR FAN MOTOR” on page 9-78.NG 
Replace the radiator fan motor.
OK 
5. Check the radiator fan motor relay.
Refer to “CHECKING THE RE-
LAYS” on page 9-72.NG 
Replace the radiator fan motor relay.
OK 
6. Check the coolant temperature sen-
sor.
Refer to “CHECKING THE COOL-
ANT TEMPERATURE SENSOR”
on page 9-78.NG 
Replace the coolant temperature sensor.
OK 
7. Check the entire cooling system’s
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 9-16.NG 
Properly connect or repair the cooling sys-
tem’s wiring.
OK 
Replace the ECU.

FUEL INJECTION SYSTEM
9-51
Fault code No. 46
Item Charging voltage is abnormal.
Fail-safe systemAble/Unable to start engine
Able/Unable to drive vehicle
Diagnostic code No.—
Diagnostic tool display—
Procedure—
ItemProbable cause of malfunc-
tion and checkMaintenance jobConfirmation of service
completion
1 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).Improperly connected 
Connect the coupler securely
or repair/replace the wire har-
ness.Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Go to item 2.
2 Wire harness continuity. Open or short circuit Re-
place the wire harness.
Between rectifier/regulator
coupler and ECU coupler.
red–red
Between battery terminal and
ECU coupler.
red–redStart the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Go to item 3.
3 Defective AC magneto. Check the AC magneto.
Refer to “CHARGING SYS-
TEM” on page 9-12.
Defective AC magneto  Re-
place.Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Go to item 4.
4 Malfunction in ECU. Replace the ECU.

FUEL PUMP SYSTEM
9-58
EAS2GBB380TROUBLESHOOTING
The fuel pump fails to operate.
TIP
Before troubleshooting, remove the following part(s):
1. Seat
2. Side cover (left/right)
3. Air scoop (left/right)
4. Fuel tank
1. Check the fuse.
Refer to “CHECKING THE FUSES”
on page 9-68.NG 
Replace the fuse(s).
OK 
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 9-69.NG 
• Clean the battery terminals.
• Recharge or replace the battery.
OK 
3. Check the engine stop switch.
Refer to “CHECKING THE
SWITCHES” on page 9-64.NG 
Replace the engine stop switch.
OK 
4. Check fuel pressure.
Refer to “CHECKING THE FUEL
PRESSURE” on page 8-5.NG 
Replace the fuel pump.
OK 
5. Check the fuel pump system wire
harness connections.
Refer to “CIRCUIT DIAGRAM” on
page 9-56.NG 
Properly connect or repair the fuel pump
system’s wiring.
OK 
Replace the ECU.