Yamaha 2007 XP500 Service Manual page 405

(ABS) coupler and the red/white terminal of the ABS motor coupler. → [D-1]
Remove the fail-safe relay and check for continuity between the red/white terminal of the ABS motor
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coupler of the wire harness (ABS) and the positive battery terminal.
3. Fail-safe relay
Check if the fail-safe relay operates correctly. → [D-2]
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Malfunction code 41 (Front wheel will not recover from the locking tendency even though the
signal is continuously transmitted from the ECU (ABS) to release the hydraulic state [when
the battery voltage is normal].)
NOTE:
Check following the steps in sequence.
1. Rotation of the front wheel
Check that there is no brake disc drag on the front wheel and make sure it rotates smoothly.
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Check the front wheel axle for loose bearings and bends, and the brake disc for distortion.
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2. Brake master cylinder and brake caliper
Check that the brake fluid pressure is correctly transmitted to the brake caliper when the brake lever
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is operated and that the pressure decreases when the lever is released.
3. Brake fluid
Visually check the brake fluid in the brake master cylinder reservoir and the fluid for water, foreign
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materials, solidification and contamination.
Check for air in the brake hose lines.
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4. Brake hose lines
Check the brake hose lines for kinks and deterioration.
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EWA15B3005
WARNING
Only use genuine Yamaha parts. Using other brake pipes, hoses and union bolts may close the
brake hose lines.
Check that the connections of the brake hose lines from the brake master cylinder to the hydraulic
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unit and to the front brake caliper from the hydraulic unit are correct.
EWA15B3006
WARNING
The front brake will not function properly if the connections are reversed.
Front brake hose "1" outlet: to the front brake caliper
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Front brake hose "2" inlet: from the front brake master cylinder
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NOTE:
If the front brake hose inlet and outlet connections are reversed on the hydraulic unit, the brake lever
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is pulled to full stroke without responding and will be pushed back slowly without pulsating when the
final check in [D-6] is performed.
If the front and rear brake hose connections are reversed on the hydraulic unit, the pulsating action in
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the right hand brake lever and left hand brake lever will be performed in the reverse order when the
final check in [D-6] is performed.
ABS (ANTI-LOCK BRAKE SYSTEM) (XP500A)
8-90
2
1