2015 YAMAHA YZ250F sensor

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Page 336 of 356

YAMAHA YZ250F 2015  Owners Manual TROUBLESHOOTING
9-1
EAS1SM5351
TROUBLESHOOTING
EAS1SM5352GENERAL INFORMATION
TIP
The following guide for troubleshooting does 
not cover all the possible causes of trouble. It 
should be helpful, howe

Page 337 of 356

YAMAHA YZ250F 2015  Owners Manual TROUBLESHOOTING
9-2
3. Ignition system
• Faulty ECU
• Faulty crankshaft position sensor
• Broken generator rotor woodruff key
EAS1SM5355POOR MEDIUM-AND-HIGH-SPEED PER-
FORMANCE
Refer to “START

Page 338 of 356

YAMAHA YZ250F 2015  Owners Manual TROUBLESHOOTING
9-3
Fuel system
1. Throttle body
• Damaged or loose throttle body joint
2. Air filter
• Clogged air filter element
Chassis
1. Brake(s)
• Dragging brake
Electrical system
1. Spark

Page 339 of 356

YAMAHA YZ250F 2015  Owners Manual LIST OF SELF-DIAGNOSTIC AND FAIL-SAFE ACTIONS
9-4
EAS1SM5365
LIST OF SELF-DIAGNOSTIC AND FAIL-SAFE ACTIONS
LIST OF DIAGNOSTIC CODES
COMMUNICATION ERROR WITH YAMAHA DIAGNOSTIC TOOLFault 
codeITEM Page

Page 340 of 356

YAMAHA YZ250F 2015  Owners Manual LIST OF SELF-DIAGNOSTIC AND FAIL-SAFE ACTIONS
9-5
SENSOR OPERATION TABLE
Diag-
nostic 
code 
No.ITEM Display Procedure
01 Throttle angle
• Fully closed position
• Fully opened positionDisplays the

Page 352 of 356

YAMAHA YZ250F 2015  Owners Manual EAS1SM5382
WIRING DIAGRAM
YZ250F/YZ250FF 2015
1. Crankshaft position sensor
2. AC magneto
3. Rectifier/regulator
4. Joint connector
5. Condenser
6. Coupler for connecting option-
al part
7. Engine sto
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