Yamaha YZF-R25 Service Manual page 399

Fault code No.
Item
A-2 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).
A-3 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).
A-4 Wire harness continuity.
A-5 Defective speed sensor
A-6 Malfunction in ECU.
A-7 Delete the fault code.
42
Speed sensor: no normal signals are received from the speed
A
sensor.
B Gear position switch: open or short circuit is detected.
C Clutch switch: open or short circuit is detected.
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 speed sensor coupler
and ECU coupler.
blue–blue
black/blue–black/blue
white/yellow–white/yellow
Check the speed sensor.
Replace if defective.
Refer to "CHECKING THE
SPEED SENSOR" on page
8-92.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-81.
8-54
FUEL INJECTION SYSTEM
Execute the diagnostic mode.
(Code No. 07)
Rotate the rear wheel by hand
and check that the indicated val-
ue increases.
Value increases → Go to item
A-7 and delete the fault code.
Value does not increase → Go
to item A-3.
Execute the diagnostic mode.
(Code No. 07)
Rotate the rear wheel by hand
and check that the indicated val-
ue increases.
Value increases → Go to item
A-7 and delete the fault code.
Value does not increase → Go
to item A-4.
Execute the diagnostic mode.
(Code No. 07)
Rotate the rear wheel by hand
and check that the indicated val-
ue increases.
Value increases → Go to item
A-7 and delete the fault code.
Value does not increase → Go
to item A-5.
Execute the diagnostic mode.
(Code No. 07)
Rotate the rear wheel by hand
and check that the indicated val-
ue increases.
Value increases → Go to item
A-7 and delete the fault code.
Value does not increase → Go
to item A-6.
Go to item A-7 and delete the
fault code.
Turn the main switch to "ON",
and then rotate the rear wheel
by hand.
Start the engine, and input the
vehicle speed signals by operat-
ing the vehicle at 20 to 30 km/h
(12 to 19 mph).
Check that the fault code num-
ber is not displayed.