2014 YAMAHA YZ450F sensor

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Page 287 of 360

YAMAHA YZ450F 2014  Owners Manual THROTTLE BODY
7-8
EAS1SL1315CHECKING THE INJECTOR
1. Check:
• Injector
Obstruction  Replace, and check the fuel 
pump and the fuel injection system.
Refer to “FUEL INJECTION SYSTEM” on 
page

Page 288 of 360

YAMAHA YZ450F 2014  Owners Manual THROTTLE BODY
7-9
ADJUSTING THE THROTTLE POSITION 
SENSOR
EWA32D1011
WARNING
• Handle the throttle position sensor with 
special care.
• Never subject the throttle position sensor 
to strong shock

Page 289 of 360

YAMAHA YZ450F 2014  Owners Manual 8
ELECTRICAL SYSTEM
IGNITION SYSTEM.......................................................................................... 8-2
CIRCUIT DIAGRAM ......................................................

Page 293 of 360

YAMAHA YZ450F 2014  Owners Manual IGNITION SYSTEM
8-3
EAS1SL1322
1. Crankshaft position sensor
2. AC magneto
3. Rectifier/regulator
4. Joint connector
5. Condenser
7. Engine stop switch
9. ECU
10.Ignition coil
11.Spark plug

Page 294 of 360

YAMAHA YZ450F 2014  Owners Manual IGNITION SYSTEM
8-4
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
TIP
Before troubleshooting, remove the following part(s):
1. Side cover (left/right)
2. Seat

Page 301 of 360

YAMAHA YZ450F 2014  Owners Manual FUEL INJECTION SYSTEM
8-11
EAS1SL1327
1. Crankshaft position sensor
2. AC magneto
3. Rectifier/regulator
4. Joint connector
5. Condenser
7. Engine stop switch
8. Neutral switch
9. ECU
12.Fuel injector

Page 302 of 360

YAMAHA YZ450F 2014  Owners Manual FUEL INJECTION SYSTEM
8-12
YAMAHA DIAGNOSTIC TOOL
This model uses the Yamaha diagnostic tool to identify malfunctions.
For information about using the Yamaha diagnostic tool, refer to the operation ma

Page 304 of 360

YAMAHA YZ450F 2014  Owners Manual FUEL INJECTION SYSTEM
8-14
Fault code12
SymptomCrankshaft position sensor: no normal signals are received 
from the crankshaft position sensor.
Fail-safe systemUnable to start engine
Unable to drive v