Yamaha XP500 Service Manual page 313

• [C-5-12] Malfunction code 51 (Front wheel does not recover from the locking tendency
even though the signal is continuously transmitted from the ECU (ABS) to release the
hydraulic pressure [when the battery voltage is low].)
Check the following:
1) Rotation of the front wheel
Refer to "[C-5-10] Malfunction code 41".
2) Brake master cylinder and brake caliper
Refer to "[C-5-10] Malfunction code 41".
3) Brake fluid
Refer to "[C-5-10] Malfunction code 41".
4) Brake hose lines
Refer to "[C-5-10] Malfunction code 41".
5) Hydraulic unit solenoid coupler terminals
Refer to "[C-5-10] Malfunction code 41".
6) Hydraulic unit
Refer to "[C-5-10] Malfunction code 41".
7) Battery voltage
Measure the battery voltage.
• [C-5-13] Malfunction code 52 (Rear wheel does not recover from the locking tendency even
though the signal is continuously transmitted from the ECU (ABS) to release the hydraulic
pressure [when the battery voltage is low].)
Check the following:
1) Rotation of the rear wheel
Refer to "[C-5-11] Malfunction code 42".
2) Brake master cylinder and brake caliper
Refer to "[C-5-11] Malfunction code 42".
3) Brake fluid
Refer to "[C-5-11] Malfunction code 42".
4) Brake hose lines
Refer to "[C-5-11] Malfunction code 42".
5) Hydraulic unit solenoid coupler terminals
Refer to "[C-5-11] Malfunction code 42".
6) Hydraulic unit
Refer to "[C-5-11] Malfunction code 42".
7) Battery voltage
Measure the battery voltage.
ANTI-LOCK BRAKE SYSTEM (XP500A)
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CHAS