Yamaha WR450FB 2012, Owner'S Service Manual

Page: 340 / 392

FUEL INJECTION SYSTEM
9-36
TIP
If fault code Nos. 13 and 14 are both displayed, perform the checks and maintenance jobs for fault
code No. 13 first.
6 Defective intake air pressure
sensor.
Execute the diagnostic mode.
(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.
o
Replace the intake air pres-
sure sensor.
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.
7 Malfunction in ECU. Replace the ECU.
Fault code No. 14
Item
Intake air pressure sensor: hose system malfunction (clogged
or detached hose).
Fail-safe system Able to start engine
Able to drive vehicle
Diagnostic code No. d:03
Diagnostic tool display Displays the intake air pressure.
Procedure Operate the throttle while pushing the start switch.(If the display
value changes, the performance is OK.)
Or-
der
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service
completion
1 The intake air pressure sen-
sor hose is damaged, discon-
nected, clogged, twisted or
bent.
Repair or replace the sensor
hose.
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played
o
Service is finished.
Fault code number is dis-
played
o
Proceed to the next
order.
Fault code No. 13
Item Intake air pressure sensor: open or short circuit detected.