Yamaha 2007 XP500 Service Manual page 401

Front wheel sensor lead or internal circuit is broken. → [D-3]
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Wire harness (ABS) sensor circuit is broken. → (Refer to "CIRCUIT DIAGRAM" on page 8-65.)
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ECU (ABS) coupler terminal is disconnected. → [D-1]
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2. ABS warning light goes on for 2 seconds then goes off.
With the front wheel stopped, the rear wheel was rotated for more than 20 seconds. This is not a
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malfunction.
Signal is not generated at the front wheel sensor.
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Front wheel sensor is not installed properly. → [D-3]
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Front wheel sensor rotor is defective. → [D-3]
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Front wheel sensor circuit is short-circuited.
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Front wheel sensor or lead is short-circuited. → [D-3]
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Wire harness (ABS) sensor circuit is short-circuited. → (Refer to "CIRCUIT DIAGRAM" on page
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8-65.)
Front wheel sensor output drops.
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Sensor signal output may drop due to failure on bearings, wheel axle, wheel or sensor housing of
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front wheel. Check these components when installed for looseness, distortion, and bends.
Malfunction code 12 (Rear wheel sensor signal is not received properly.)
Turn the main switch to "OFF", then back to "ON" after removing the test coupler adapter.
1. ABS warning light remains on.
→ Defective connection in the rear wheel sensor circuit.
Rear wheel sensor coupler is disconnected. → [D-4]
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Rear wheel sensor lead or internal circuit is broken. → [D-4]
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Wire harness (ABS) sensor circuit is disconnected. → (Refer to "CIRCUIT DIAGRAM" on page
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8-65.)
ECU (ABS) coupler terminal is disconnected. → [D-1]
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2. ABS warning light goes on for 2 seconds then goes off.
With the rear wheel stopped, the front wheel was rotated at a speed faster than 11 km/h. This is not
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a malfunction.
Signal is not generated at the rear wheel sensor.
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Rear wheel sensor is not installed properly. → [D-4]
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Rear wheel sensor rotor is defective. → [D-4]
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Rear wheel sensor circuit is short-circuited.
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Rear sensor or lead is short-circuited. → [D-4]
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Wire harness (ABS) sensor circuit is short-circuited. → (Refer to "CIRCUIT DIAGRAM" on page
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8-65.)
Rear wheel sensor output drops.
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Sensor signal output may drop due to failure of the bearing, wheel, or brake caliper bracket of the
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rear wheel. Check these components when installed for looseness, distortion, and bends.
NOTE:
If the vehicle is ridden on extremely uneven roads continuously, the ABS warning light may flash and
malfunction code 11 or 12 may be recorded depending on the condition.
Malfunction code 13 (front wheel) and malfunction code 14 (rear wheel) (Incorrect signal is
detected by the front (13) or rear (14) wheel sensor.)
1. The wheel sensors or sensor rotors are not properly installed.
Installation of the front or rear wheel sensor
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Check that the wheel sensor is properly installed in the housing. → [D-3, 4]
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Check if there is looseness between the housing and the front wheel. → [D-3, 4]
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Check if there is looseness rear brake caliper bracket and the rear wheel. → [D-3, 4]
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Installation of the front or rear wheel sensor rotor
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Check that the sensor rotor is correctly pressed in the front wheel. → [D-3, 4]
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Check that the sensor rotor is correctly install to the rear wheel. → [D-3, 4]
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Check the rotor and inside the rotor housing for foreign materials. → [D-3, 4]
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2. Teeth surfaces of the sensor rotors are defective.
ABS (ANTI-LOCK BRAKE SYSTEM) (XP500A)
8-86