Yamaha MTN850-A 2017 Service Manual page 426

Fault code No.
Item
A-5 Rear wheel sensor lead continu-
ity, or defective rear wheel sen-
sor.
A-6 Malfunction in ECU.
A-7 Malfunction in ABS ECU.
A-8 Delete the fault code and check
that the engine trouble warning
light goes off.
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.
Open or short circuit, or defec-
tive sensor  Replace the rear
wheel sensor.
Between rear wheel sensor cou-
pler and ABS ECU coupler.
black–black
white–white
Between ABS ECU coupler and
ECU coupler.
white/yellow–white/yellow
Replace the ECU.
Refer to "REPLACING THE
ECU (Engine Control Unit)" on
page 8-157.
Replace the ABS ECU.
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).
Confirm that the fault code has
a condition of "Recovered"
using the malfunction mode of
the Yamaha diagnostic tool, and
then delete the fault code.
Delete this fault code even if it
has a condition of "Detected".
8-69
FUEL INJECTION SYSTEM
Execute the diagnostic mode.
(Code No. 07)
Rotate the rear wheel by hand
and check that the indicated
value increases.
Value increases  Go to item
A-8.
Value does not increase  Go
to item A-6.
Execute the diagnostic mode.
(Code No. 07)
Rotate the rear wheel by hand
and check that the indicated
value increases.
Value increases  Go to item
A-8.
Value does not increase  Go
to item A-7.
Go to item A-8.