Yamaha Wolverine YX70EPNG, Service Manual

Page: 432 / 503

FUEL INJECTION SYSTEM
9-57
Procedure
Check that the number increases when the rear wheels are rotated. The
number is cumulative and does not reset each time the wheel is stopped.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
1 Connection of speed 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). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Turn the main switch to “ ”
(on), and then rotate the rear
wheel by hand.
Fault code number is not dis-
played
→
Go to item 6.
Fault code number is displayed
→
Go to item 2.
2 Connection of 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). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Turn the main switch to “ ”
(on), and then rotate the rear
wheel by hand.
Fault code number is not dis-
played
→
Go to item 6.
Fault code number is displayed
→
Go to item 3.
3 Wire harness continuity. Open or short circuit
→
Replace
the wire harness.
Between speed sensor coupler
and ECU coupler. (except for
EPS models)
white–white
Between speed sensor coupler
and joint coupler. (for EPS mod-
els)
white–white
Between joint coupler and ECU
coupler. (for EPS models)
white–white
Between speed sensor coupler
and joint coupler.
blue–blue
black/blue–black/blue
Between joint coupler and ECU
coupler.
blue–blue
black/blue–black/blue
Turn the main switch to “ ”
(on), and then rotate the rear
wheel by hand.
Fault code number is not dis-
played
→
Go to item 6.
Fault code number is displayed
→
Go to item 4.
4 Defective speed sensor. Execute the diagnostic mode.
(Code No. 07)
While the rear wheels and
stopped, check that the indicat-
ed value does not change.
Rotate the rear wheel by hand
and check that the indicated
value increases.
Malfunction
→
Replace the
speed sensor.
Turn the main switch to “ ”
(on), and then rotate the rear
wheel by hand.
Fault code number is not dis-
played
→
Go to item 6.
Fault code number is displayed
→
Go to item 5.
5 Malfunction in ECU. Replace the ECU.
Fault code No. 42
Item
Speed sensor: no normal signals are received from the speed sen-
sor.