2016 YAMAHA YZ450F Owners Manual

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YAMAHA YZ450F 2016  Owners Manual FUEL INJECTION SYSTEM
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CONNECTING THE YAMAHA DIAGNOSTIC TOOL
1. Remove the coupler for connecting setting tool.
2. Connect the FI diagnostic tool sub-lead.
3. Connect the FI diagnostic tool sub-le

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YAMAHA YZ450F 2016  Owners Manual FUEL INJECTION SYSTEM
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Fault code 12
SymptomCrankshaft position sensor: no normal signals are received 
from the crankshaft position sensor.
Fail-safe systemUnable to start engine
Unable to drive

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YAMAHA YZ450F 2016  Owners Manual FUEL INJECTION SYSTEM
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TIP
If fault code Nos. 13 and 14 are both displayed, perform checkup and repair jobs for fault code No. 
13 first.
Fault code 13
Symptom Intake air pressure sensor: open or

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YAMAHA YZ450F 2016  Owners Manual FUEL INJECTION SYSTEM
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TIP
If fault code Nos. 13 and 14 are both displayed, perform checkup and repair jobs for fault code No. 
13 first.6 Defective intake air pressure 
sensor.Execute the diagnos

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YAMAHA YZ450F 2016  Owners Manual FUEL INJECTION SYSTEM
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2 Defective intake air pressure 
sensor.Execute the diagnostic mode. 
(Code No. 03)
Atmospheric pressure at the 
current altitude and weather 
conditions is indicated.
0 m a

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YAMAHA YZ450F 2016  Owners Manual FUEL INJECTION SYSTEM
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3 Connection of sub wire har-
ness coupler.
Check the locking condition 
of the coupler.
Disconnect the coupler, and 
check the pins (for bent or 
broken terminals and locki

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YAMAHA YZ450F 2016  Owners Manual FUEL INJECTION SYSTEM
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Fault code 16
SymptomThrottle position sensor: stuck throttle position sensor is de-
tected.
Fail-safe systemAble to start engine
Able to drive vehicle
Diagnostic code No.01

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YAMAHA YZ450F 2016  Owners Manual FUEL INJECTION SYSTEM
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TIP
Make sure that the machine is completely cold before checking the coolant temperature sensor.
Fault code 21
Symptom Coolant temperature sensor: open or short circuit det