Yamaha Star XVS950A 2009, Service Manual

Page: 345 / 402

FUEL INJECTION SYSTEM
7-58
A. Speed sensor system malfunction
Order
Item/components and
probable cause
Check or mainte-
nance job
Sensor inspection
procedure
1 Connection of speed
sensor (meter) coupler
Check the connection
of the coupler is
secure.
Remove the coupler,
and check each pin (for
bending, wear, or lock-
ing). Poor connection
→
Connect it securely, or
repair/replace the wire
harness.
Start the engine, and
check the connection of
the coupler is secure.
Ride on the vehicle at a
low speed (approx. 20–
30 km/h).
2 Connection of main
harness ECU coupler
Check the connection
of the coupler is
secure.
Remove the coupler,
and check each pin (for
bending, wear, or lock-
ing). Poor connection
→
Connect it securely, or
repair/replace the wire
harness.
3 Continuity of speed
sensor leads
Continuity of wire har-
ness Open or short circuit
→
Replace the sensor.
Black/Blue–Black/Blue
Blue–Blue
White/Yellow–White/
Yellow
4 Speed sensor malfunc-
tion
Refer to “CHECKING
THE SPEED SEN-
SOR” on page 7-103. Replace the speed
sensor.
5 ECU malfunction Replace the ECU.