Yamaha 2007 XP500 Service Manual page 406

5. Hydraulic unit solenoid coupler terminal
Check if the front and rear hydraulic unit solenoid coupler terminals (hydraulic unit and wire harness
G
[ABS]) are reversed.
Front
Rear
6. Hydraulic unit
If the malfunction is not corrected after performing steps 1 to 5, replace the hydraulic unit. Be sure
to connect the brake hoses and couplers correctly and securely. Check the hydraulic unit operation.
(Refer to "[D-6] FINAL CHECK" on page 8-95.)
Malfunction code 42 (Rear wheel not recover from the locking tendency even though the sig-
nal is continuously transmitted from the ECU (ABS) to release the hydraulic state [when the
battery voltage is normal].)
Check the following:
1. Rotation of the rear wheel
Check that there is no brake drag on the rear wheel and make sure it rotates smoothly.
G
Check for brake disc distortion.
G
2. Brake master cylinder and brake caliper
Check that the brake fluid pressure is correctly transmitted to the brake disc when the left hand brake
G
lever 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 check the fluid for water,
G
foreign materials, solidification and contamination.
Check for air in the brake hose lines.
G
4. Brake hose lines
Check the brake hose lines for kinks and deterioration (particularly between the hydraulic unit and
G
the rear brake caliper).
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
G
unit and to the rear brake caliper from the hydraulic unit are correct.
EWA15B3007
WARNING
The rear brake will not function properly if the connections are reversed.
Rear brake hose "1" outlet: to the rear brake caliper
G
Rear brake hose "2" inlet: from the rear brake master cylinder
G
NOTE:
If the rear brake hose inlet and outlet connections are reversed on the hydraulic unit, the left hand
G
brake lever is pulled to full stroke without responding and will be pushed back slowly without pulsating
when the final check is performed.
If the front and rear brake hose connections are reversed on the hydraulic unit, the pulsating action in
G
the right hand brake lever and left hand brake lever will be performed in the reverse order when the
final check is performed.
ABS (ANTI-LOCK BRAKE SYSTEM) (XP500A)
Solenoid side
Red, Green
Red, White
8-91
Terminal color
Wire harness side (ABS)
Red, White
Red, Green