Yamaha FJR1300AS(X), Service Manual

Page: 632 / 754

ABS (ANTI-LOCK BRAKE SYSTEM)
8-155
NOTE:
Vehicle possibly ridden on uneven roads.
Fault code No. AbS_14
AbS_27 Symptom Incorrect signal from the rear wheel sensor is
detected.
Order Item/components and probable
cause
Check or maintenance job Reinstatement
confirmation
method
1 Installed condition of wheel sensor. Check for looseness. Repair or
replace the wheel sensor if nec-
essary. • Turn the main
switch to “ON”
and check
that the ABS
warning light
comes on for
2 seconds,
then goes off.
• Perform a tri-
al run at a
constant
speed of 30
km/h and
check that the
ABS warning
light does not
come on.
2 Installed condition of wheel bearings,
axle, sensor housing, and sensor ro-
tor. Check the components for loose-
ness, distortion, and bends.
Refer to “CHECKING THE REAR
WHEEL” on page 4-28.
3 Foreign material inside sensor hous-
ing. Check the interior of the sensor
housing and the surface of the
sensor rotor for foreign material,
such as metal particles. Clean
the sensor housing and sensor
rotor if necessary.
Refer to “MAINTENANCE OF
THE REAR WHEEL SENSOR
AND SENSOR ROTOR” on page
4-28.
4 Defective sensor rotor. Check the surface of the sensor
rotor for damage. If there is visi-
ble damage, replace the sensor
rotor.
Refer to “MAINTENANCE OF
THE REAR WHEEL SENSOR
AND SENSOR ROTOR” on page
4-28.
5 Hydraulic unit assembly internal mal-
function. Replace the hydraulic unit as-
sembly.
Fault code No. AbS_15 Symptom No continuity in the front wheel sensor circuit.
Order Item/components and probable
cause
Check or maintenance job Reinstatement
confirmation
method
1 Connections
• Front wheel sensor coupler
• ABS ECU coupler • Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
NOTE:
Turn the main switch to “OFF” be-
fore disconnecting or connecting
a coupler.
Turn the main
switch to “ON”
and check that
the ABS warn-
ing light comes
on for 2 sec-
onds, then
goes off.