Yamaha YP250A 1999 Supplementary Service Manual page 65

NOTE:
S If the inlet and outlet to connect with the HU are mistaken, when the HU operation test is performed which is
shown in [D-6], the brake lever enters down to full stroke without responding and will be pushed back slow-
ly without pulsation.
S If the connection of front and rear side is mistaken, when the HU operation test is performed which is
shown in [D-6], the HU operation of front and rear sides will be performed in reverse steps.
5) Solenoid connector terminal
S Check if the front and rear solenoid connector terminals (HU and wire harness sides) are reversed.
Front
Rear
6) HU
If the problem does not come under any phenomena from 1) to 5), the function failure of hydraulic unit could
be thought. Replace the hydraulic unit and execute the secure piping and wiring. Check by the HU operation
test as described in [D-6].
[C-5-11] Malfunction code "42" (Rear wheel will not recover from the locking tendency even though
the signal is continuously sent from the ECU to release the hydraulic state (while the battery
voltage is normal.))
1) Rotation of wheels
S Check there is no brake dragging with the rear wheel and it rotates smoothly.
S Check if there is a distortion on brake discs.
2) Master cylinder and caliper
S Check the brake fluid pressure is correctly transmitted to brake disc when the brake lever is operated and
the pressure is discompressed when the lever is released.
3) Brake fluid
S Check the brake fluid in the reservoir tank by observing. (Mixing of water, foreign matters, solidification
and contamination)
S Check if air is mixed in the brake hose line.
4) Brake hose line
S Check if the brake hose line is folded or broken. (Particularly between the HU ! rear caliper)
WARNING
Using brake pipes, hoses and union bolts other than genuine YAMAHA parts may close the piping
lines. Do not use them.
S Check the connection of brake hose or pipe lines on the master cylinder and caliper sides to the HU are
correct.
ANTI-LOCK BRAKE SYSTEM (ABS)
Terminal color
Solenoid side Wire harness side
Red, white
Red, green
Red, white
Red, green
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CHAS