Yamaha Star XVS950A 2009 Service Manual page 345

A. Speed sensor system malfunction
Order
1
2
3
4
5
Item/components and
probable cause
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).
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).
Continuity of speed
sensor leads
Continuity of wire har-
ness
Speed sensor malfunc-
tion
Refer to "CHECKING
THE SPEED SEN-
SOR" on page 7-103.
ECU malfunction
FUEL INJECTION SYSTEM
Check or mainte-
nance job
Poor connection →
Connect it securely, or
repair/replace the wire
harness.
Poor connection →
Connect it securely, or
repair/replace the wire
harness.
Open or short circuit →
Replace the sensor.
Black/Blue–Black/Blue
Blue–Blue
White/Yellow–White/
Yellow
Replace the speed
sensor.
Replace the ECU.
7-58
Sensor inspection
procedure
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).