Yamaha YZF-R25 Service Manual page 402

Fault code No.
Item
B-9 Delete the fault code.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
C-1 Locate the malfunction.
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.
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.
Able to start engine
Able to drive vehicle
21
Clutch switch
• "ON" (when the clutch lever is squeezed with the transmission in gear)
• "OFF" (when the clutch lever is released with the transmission in gear)
Operate the transmission and clutch lever.
Maintenance job
Execute the diagnostic mode.
(Code No. 07)
Rotate the rear wheel by hand
and check that the indicated val-
ue increases.
Execute the diagnostic mode.
(Code No. 21)
When the transmission is in
neutral: "ON"
When the transmission is in
gear with the clutch lever re-
leased: "OFF"
When the transmission is in
gear with the clutch lever
squeezed: "ON"
8-57
FUEL INJECTION SYSTEM
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.
Confirmation of service com-
Value does not increase → Go
to item A-2 for the speed sen-
sor.
Incorrect indication → Go to
item B-2 for the gear position
switch.
Incorrect indication → Go to
item C-2.
pletion