Yamaha WR450FB 2012 Owner's Service Manual page 338

FUEL INJECTION SYSTEM
Fault code No. 14
Item
Intake air pressure sensor: hose system malfunction (clogged
or detached hose).
2
Defective intake air pressure Execute the diagnostic mode.
sensor. (Code No. d:03)
When engine is stopped:
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
At sea level: Approx. 101 kPa
1000 m above sea level: Ap-
prox. 90 kPa
2000 m above sea level: Ap-
prox. 80 kPa
3000 m above sea level: Ap-
prox. 70 kPa
When engine is cranking:
Make sure that the indication
value changes.
The value does not change
when engine is cranking.
~
Replace the intake air pres-
sure sensor.
TIP~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-
lf fault code Nos. 15 and 16 are both displayed, perform the checks and maintenance jobs for fault
·code No. 15 first.
Fault code No. 15
Item Throttle position sensor: open or short circuit detected.
Fail-safe system Able to start engine
Able to drive vehicle
Diagnostic code No.
d:01
Diagnostic tool displa·y Throttle position sensor signal
• 9-16 (fully closed position)
Procedure Check with throttle valves fully closed.
Or- Probable cause of malfunc-
Maintenance job
Confirmation of service
der tion and check·
completion
1 Connection of throttle posi-
Improperly connected
~
Set the main switch to "ON".
tion sensor coupler.
Connect the coupler securely Fault code number is not dis-
Check the locking condition or repair/replace the wire har- played
~
Service is finished.
of the coupler. ness.
Fault code number is dis-
Disconnect the coupler and
played
~
Go to next order.
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
9-37