Yamaha YZFR1Y(C) 2009 Service Manual page 467

A. Speed sensor system malfunction
Item/components and
probable cause
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 locking).
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 locking).
3 Continuity of wire harness
4 Speed sensor malfunction
Refer to "CHECKING THE
SPEED SENSOR" on page
8-121.
5 ECU malfunction
FUEL INJECTION SYSTEM
Check or maintenance 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 wire harness.
Black/Blue–Black/Blue
Blue–Blue
White/Yellow–White/Yellow
Replace the speed sensor.
Replace the ECU.
8-80
Sensor inspection proce-
dure
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).
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
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).
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
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).
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
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).
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.