Yamaha WR450FB 2012, Owner'S Service Manual

Page: 350 / 392

FUEL INJECTION SYSTEM
9-46
3 Wire harness continuity. Open or short circuit
o
Re-
place the wire harness.
Between lean angle sensor
coupler and ECU coupler.
blue–blue
yellow/green–yellow/green
black/blue–black/blue
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.
4 Defective lean angle sensor. Execute the diagnostic mode.
(Code No. d:08)
Replace if defective.
Refer to “CHECKING THE
LEAN ANGLE SENSOR” on
page 9-72.
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.
5 Malfunction in ECU. Replace the ECU.
Fault code No. 42
Item
Speed sensor: no normal signals are received from the speed
sensor.
Fail-safe system Able to start engine
Able to drive vehicle
Diagnostic code No. d:07
Diagnostic tool display Vehicle speed pulse
0–999
Procedure Check that the number increases when the front wheel is rotated.
The number is cumulative and does not reset each time the wheel
is stopped.
Or-
der
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service
completion
1 Connection of speed sensor
(meter) 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).
Improperly connected
o
Connect the coupler securely
or repair/replace the wire har-
ness.
Execute the diagnostic mode.
(Code No. d:07)
Rotate the front wheel by
hand and check that the indi-
cated value increases.
Fault code number is not dis-
played
o
Service is finished.
Fault code number is dis-
played
o
Go to next order.
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).
Improperly connected
o
Connect the coupler securely
or repair/replace the wire har-
ness.
Execute the diagnostic mode.
(Code No. d:07)
Rotate the front wheel by
hand and check that the indi-
cated value increases.
Fault code number is not dis-
played
o
Service is finished.
Fault code number is dis-
played
o
Go to next order.
Fault code No. 41
Item Lean angle sensor: open or short circuit detected.