Yamaha MTN850-A 2017 Service Manual page 427

Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
B-1 Locate the malfunction.
B-2 Connection of neutral switch
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).
P0500, P1500
Rear wheel sensor: no normal signals are received from the
A
rear wheel sensor.
B Neutral 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
Neutral switch
• "ON" (when the transmission is in neutral)
• "OFF" (when the transmission is in gear with the clutch lever released)
Operate the transmission and clutch lever.
Maintenance job
(Fault code No. P0500 or P0500
and P1500 detected.)
Execute the diagnostic mode.
(Code No. 07)
Rotate the rear wheel by hand
and check that the indicated
value increases.
(Fault code No. P1500
detected.)
Execute the diagnostic mode.
(Code No. 21)
When the transmission is in
neutral: "ON"
When the transmission is in
gear with the clutch lever
released: "OFF"
When the transmission is in
gear with the clutch lever
squeezed and the sidestand is
retracted: "ON"
Improperly connected  Con-
nect the coupler securely or
replace the wire harness.
8-70
FUEL INJECTION SYSTEM
Confirmation of service com-
Value does not increase  Go
to item A-2 for the rear wheel
sensor.
Incorrect indication  Go to
item B-2.
Incorrect indication  Go to
item C-2 for the clutch switch.
Execute the diagnostic mode.
(Code No. 21)
When the transmission is in
neutral: "ON"
When the transmission is in
gear with the clutch lever
released: "OFF"
Correct indication  Go to item
B-9.
Incorrect indication  Go to
item B-3.
pletion