Yamaha WR450FB 2012, Owner'S Service Manual

Page: 343 / 392

FUEL INJECTION SYSTEM
9-39
TIP
If fault code Nos. 15 and 16 are both displayed, perform the checks and maintenance jobs for fault
code No. 15 first.
TIP
Make sure that the engine is completely cool before checking the coolant temperature sensor.
Fault code No. 16
Item
Throttle position sensor: stuck throttle position sensor is de-
tected.
Fail-safe system Able to start engine
Able to drive vehicle
Diagnostic code No. d:01
Diagnostic tool display Throttle position sensor signal
• 9–16 (fully closed position)
Procedure Check with throttle valves fully closed.
Or-
der
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service
completion
1 Installed condition of throttle
position sensor.
Check for looseness or
pinching.
Improperly installed sensor
o
Reinstall or replace the
sensor.
Refer to “ADJUSTING THE
THROTTLE POSITION SEN-
SOR” on page 8-9.
Set the main switch to “ON”.
Fault code number is not dis-
played
o
Service is finished.
Fault code number is dis-
played
o
Go to next order.
2 Defective throttle position
sensor.
Execute the diagnostic mode.
(Code No. d:01)
Replace if defective.
Set the main switch to “ON”.
Fault code number is not dis-
played
o
Service is finished.
Fault code number is dis-
played
o
Go to next order.
3 Malfunction in ECU. Replace the ECU.