2015 YAMAHA WR 250F check engine

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Page 389 of 430

YAMAHA WR 250F 2015  Owners Manual FUEL INJECTION SYSTEM
9-55
TIP
Before troubleshooting, disconnect the starter motor lead from the starter relay.
Fault code No. Er-4
ItemRegistered data cannot be received from the Yamaha diagnos-
tic

Page 392 of 430

YAMAHA WR 250F 2015  Owners Manual FUEL PUMP SYSTEM
9-58
EAS2GB2382TROUBLESHOOTING
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

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YAMAHA WR 250F 2015  Owners Manual ELECTRICAL COMPONENTS
9-70
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5. Charge:
• Battery
(refer to the appropriate charging method)
EWA
WARNIN

Page 405 of 430

YAMAHA WR 250F 2015  Owners Manual ELECTRICAL COMPONENTS
9-71
b. Connect a charger and ammeter to the bat-tery and start charging.
TIP
Set the charging voltage to 16–17 V.If the set-
ting is lower, charging will be insufficient. If t

Page 407 of 430

YAMAHA WR 250F 2015  Owners Manual ELECTRICAL COMPONENTS
9-73
EAS2GB2389CHECKING THE DIODE
1. Check:
•Diode
Out of specification  Replace.
TIP
The pocket tester and the analog pocket tester 
readings are shown in the following tab

Page 410 of 430

YAMAHA WR 250F 2015  Owners Manual ELECTRICAL COMPONENTS
9-76
b. Check the starter motor operation.
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EAS28150CHECKING THE STATOR COIL
1. Di

Page 414 of 430

YAMAHA WR 250F 2015  Owners Manual ELECTRICAL COMPONENTS
9-80
c. Start the engine.
d. Measure the throttle position sensor input 
voltage.
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Page 418 of 430

YAMAHA WR 250F 2015  Owners Manual TROUBLESHOOTING
10-1
EAS2GB2407
TROUBLESHOOTING
EAS2GB2408GENERAL INFORMATION
TIP
The following guide for troubleshooting does 
not cover all the possible causes of trouble. It 
should be helpful, how