Yamaha MBK MW125 2014 Service Manual page 343

Fault code No.
Item
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 Connection of left front wheel
sensor coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
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 broken
terminals and locking condition
of the pins).
3 Wire harness continuity.
4 Installed condition of speed
sensor.
5 Malfunction in ECU.
42
Speed sensor: no normal signals are received from the speed sen-
sor.
07
Speed sensor pulse
0–999
Check that the number increases when the left front wheel is rotated.
The number is cumulative and does not reset each time the wheel is
stopped.
Maintenance job
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Open or short circuit → Replace
the wire harness.
Between meter coupler and
ECU coupler.
white–white
Between ECU coupler and en-
gine ground.
black/white–black/white
Between meter coupler and
body ground.
black–black
Check the install condition and
damage.
Execute the diagnostic mode.
(Code No. 07)
Front wheel stop: The pulse in-
tegrated value should be con-
stant.
Rotate the front wheel a few
turns manually and enter the
speed pulse: The pulse inte-
grated value will be added.
Replace the speed sensor, if
defective.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-59.
8-46
FUEL INJECTION SYSTEM
Confirmation of service com-
Rotate the left front wheel by
hand.
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 2.
Rotate the left front wheel by
hand.
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 3.
Rotate the left front wheel by
hand.
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 4.
Rotate the left front wheel by
hand.
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 5.
pletion