Yamaha FJR1300A Service Manual page 537

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• ABS ECU coupler terminal is disconnected.
Refer to "MAINTENANCE OF THE ABS ECU" on page 8-120.
2. The ABS warning light comes on for 2.0 seconds, then goes off.
a. With the rear wheel stopped, the front wheel was rotated at a speed faster than about 11 km/h.
This is not a malfunction.
b. No signal is generated at the rear wheel sensor.
• Rear wheel sensor is not installed properly.
Refer to "MAINTENANCE OF THE REAR WHEEL SENSOR AND SENSOR ROTOR" on page
4-22 and "INSTALLING THE REAR WHEEL (REAR BRAKE DISC)" on page 4-23.
• Rear wheel sensor rotor is defective.
Refer to "MAINTENANCE OF THE REAR WHEEL SENSOR AND SENSOR ROTOR" on page
4-22 and "INSTALLING THE REAR WHEEL (REAR BRAKE DISC)" on page 4-23.
c. Rear wheel sensor circuit is short-circuited.
• Rear wheel sensor or lead is short-circuited.
Refer to "MAINTENANCE OF THE REAR WHEEL SENSOR AND SENSOR ROTOR" on page
4-22 and "INSTALLING THE REAR WHEEL (REAR BRAKE DISC)" on page 4-23.
• ABS wire harness is short-circuited.
Refer to "CIRCUIT DIAGRAM (1/2)" on page 8-111 and "CIRCUIT DIAGRAM (2/2)" on page
8-113.
d. Rear wheel sensor output drops.
• Sensor signal output may drop due to failure of the bearings, wheel axle, wheel, or sensor hous-
ing of the rear wheel. Check these components, without removing them, for looseness, distortion,
and bends.
NOTE:
If the vehicle is continuously ridden on extremely uneven roads, the ABS warning light may flash and
malfunction code 11 or 12 may be recorded depending on the condition.
Malfunction codes 13/26 (front wheel) and 14/27 (rear wheel) (Incorrect signal from the front
(13/26) or rear (14/27) wheel sensor is detected.)
1. The wheel sensors or sensor rotors are not properly installed.
a. Installation of the front or rear wheel sensor
• Check that the wheel sensor is properly installed in the housing.
Refer to "MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR" on page
4-16, "INSTALLING THE FRONT WHEEL (FRONT BRAKE DISCS)" on page 4-18, "MAINTE-
NANCE OF THE REAR WHEEL SENSOR AND SENSOR ROTOR" on page 4-22, and "IN-
STALLING THE REAR WHEEL (REAR BRAKE DISC)" on page 4-23.
• Check if there is looseness between the housing and wheel.
Refer to "MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR" on page
4-16, "INSTALLING THE FRONT WHEEL (FRONT BRAKE DISCS)" on page 4-18, "MAINTE-
NANCE OF THE REAR WHEEL SENSOR AND SENSOR ROTOR" on page 4-22, and "IN-
STALLING THE REAR WHEEL (REAR BRAKE DISC)" on page 4-23.
b. Installation of the front or rear wheel sensor rotor
• Check that the sensor rotor is correctly pressed in the wheel.
Refer to "MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR" on page
4-16, "INSTALLING THE FRONT WHEEL (FRONT BRAKE DISCS)" on page 4-18, "MAINTE-
NANCE OF THE REAR WHEEL SENSOR AND SENSOR ROTOR" on page 4-22, and "IN-
STALLING THE REAR WHEEL (REAR BRAKE DISC)" on page 4-23.
• Check the rotor and inside the rotor housing for foreign materials.
Refer to "MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR" on page
4-16, "INSTALLING THE FRONT WHEEL (FRONT BRAKE DISCS)" on page 4-18, "MAINTE-
NANCE OF THE REAR WHEEL SENSOR AND SENSOR ROTOR" on page 4-22, and "IN-
STALLING THE REAR WHEEL (REAR BRAKE DISC)" on page 4-23.
email: info@motomatrix.co.uk
ABS (ANTI-LOCK BRAKE SYSTEM)
8-134