Yamaha YP250A 1999 Supplementary Service Manual page 67

7) Battery voltage
Measure the battery output voltage.
[C-5-13]Malfunction code "52" (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 low).)
1) Rotation of wheels
Refer to [C-5-11] Malfunction code "42"
2) Master cylinder and caliper
Refer to [C-5-11] Malfunction code "42"
3) Brake fluid
Refer to [C-5-11] Malfunction code "42"
4) Brake hose line
Refer to [C-5-11] Malfunction code "42"
5) Solenoid coupler terminal
Refer to [C-5-11] Malfunction code "42"
6) HU
Refer to [C-5-11] Malfunction code "42"
7) Battery voltage
Refer to [C-5-12] Malfunction code "51"
ANTI-LOCK BRAKE SYSTEM (ABS)
59
CHAS