Yamaha YP250A 1999 Supplementary Service Manual page 59

Malfunction
code
Front wheel will not recover from the
locking tendency even though the
41 signal is continuously sent from the
ECU to release the hydraulic state.
(while the battery voltage is normal)
Rear wheel will not recover from the
locking tendency even though the
42 signal is continuously sent from the
ECU to release the hydraulic state.
(while the battery voltage is normal)
Front wheel will not recover from the
locking tendency even though the
51 signal is continuously sent from the
ECU to release the hydraulic state.
(while the battery voltage is low)
Rear wheel will not recover from the
locking tendency even though the
52 signal is continuously sent from the
ECU to release the hydraulic state.
(while the battery voltage is low)
Malfunctioned Inside of ECU may malfunction.
at resent at present
[B-5]
(Tester always (Tester always
indicates 8V.)
*1 Malfunction code "11" is indicated if the rear wheel rotates for longer than about 20 seconds with the front
wheel stopped, or the rear wheel rotates within one second after the main switch is turned on. (In the
case the scooter stands by the centerstand.)
NOTE:
Malfunction code "15" (front wheel sensor), "16" (rear wheel sensor) is indicated when the scooter does not
ride, and the defective connection of either front or rear sensor is detected.
ANTI-LOCK BRAKE SYSTEM (ABS)
Problem Check point
S Brake dragging
S HU operation test
(Refer to [D-6-3])
S Front wheel brake line
S Brake dragging
S HU operation test
(Refer to [D-6-3])
S Rear wheel brake line
S Brake dragging
S HU operation test
(Refer to [D-6-3])
S Front wheel brake line
S Battery voltage
S Brake dragging
S HU operation test
(Refer to [D-6-3])
S Rear wheel brake line
S Battery voltage
S ABS harness circuit
(test cou ler circuits) (test coupler circuits)
S ECU (Replace)
51
CHAS
Reference
[C-5-10]
[C-5-11]
[C-5-12]
[C-5-13]
[D-1] and
the electric- the electric-
ity group