Yamaha YP250A 1999 Supplementary Service Manual page 64

[C-5-9] Malfunction code "34" (Detected the failure operation of motor (Motor keeps rotating and will
not stop))
1) HU pump motor
S Check if the pump motor connector in the left side cover is detached or is insufficiently connected.
S Check the continuity of motor.
2) ABS harness
S With the HU pump motor connector removed, check the continuity between the black terminal of pump
motor connector of ABS harness and battery negative (–) terminal.
S With the ECU connector removed, check the continuity between the red/white terminal of ECU connec-
tor and red/white terminal of pump motor connector.
S With the fail-safe relay removed, check the continuity between the red/white terminal of pump motor
connector of ABS harness and battery positive (+) terminal.
3) Fail-safe relay
S Check if the fail-safe relay operates correctly.
[C-5-10]Malfunction code "41" (Front 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 front wheel and it rotates smoothly.
S Check if there are looseness of bearings, bending of wheel axle or 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.
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)
WARNING
Front wheel side inlet: Brake hose 1 from the
front master cylinder
Front wheel side outlet: Brake hose 2 from
the front brake caliper
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CHAS
! [D-5]
! [D-1]
! [D-2]