Yamaha WR450FB 2012 Owner's Service Manual page 349

Fault code No.
Item
5 Wire harness continuity.
6 Malfunction in ECU.
7 Stop displaying the error
code
Start the engine and leave it
idling for approximately 5
seconds.
After that, check whether or
not the error code is dis-
played.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Diagnostic tool display
Procedure
Or- Probable cause of malfunc-
der tion and check
1 Connection of lean angle
sensor coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
2 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
39
Injector: open or short circuit detected.
Open or short circuit
place the wire harness.
Between injector coupler and
ECU coupler.
red/black–red/black
red/blue–red/blue
Replace the ECU.
–
41
Lean angle sensor: open or short circuit detected.
Unable to start engine
Unable to drive vehicle
d:08
Lean angle sensor output voltage
• 0.4–1.4 (upright)
• 3.7–4.4 (overturned)
Remove the lean angle sensor and incline it more than 45 degrees.
Maintenance job
Improperly connected
Connect the coupler securely
or repair/replace the wire har-
ness.
Improperly connected
Connect the coupler securely
or repair/replace the wire har-
ness.
9-45
FUEL INJECTION SYSTEM
Re- Check for the operating
sound of the injector in the di-
agnostic mode (Code No.
d:36).
Operating sound heard
to the order 7.
Operating sound unheard
Go to the order 6.
–
–
Confirmation of service
completion
Set the main switch to "ON."
Fault code number is not dis-
played Service is finished.
Fault code number is dis-
played Go to next order.
Set the main switch to "ON".
Fault code number is not dis-
played Service is finished.
Fault code number is dis-
played Go to next order.
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