Yamaha MBK X-MAX 300 2017, Service Manual

Page: 411 / 462

ABS (ANTI-LOCK BRAKE SYSTEM)
8-106
Fault code No. 53
TIP
Turn the main switch to “OFF” before disconnecting or connecting a coupler.
Fault code No. 54
TIP
Turn the main switch to “OFF” before disconnecting or connecting a coupler.
Fault code No. 53
Item
Vehicle system power supply (voltage of ABS ECU power supply is
low)
Symptom
Power voltage supplied to the ABS ECU in the hydraulic unit assem-
bly is too low.
Order Item/components and probable cause Check or maintenance job
1 Defective battery Recharge or replace the battery.
Refer to “CHECKING AND CHARGING THE BATTERY”
on page 8-128.
2 Defective coupler between the battery
and the hydraulic unit assembly • Check the coupler for any pins that may be pulled out.
• Check the locking condition of the coupler.
• If there is a malfunction, repair it and connect the cou-
pler securely.
See TIP.
3 Open or short circuit in the wire harness
between the battery and the hydraulic unit
assembly • Replace if there is an open or short circuit.
• Between ABS ECU coupler and ABS control unit fuse.
(brown/white–brown/white)
4 Defective charging system Check the charging system.
Refer to “CIRCUIT DIAGRAM” on page 8-11.
Fault code No. 54
Item
Hydraulic unit assembly (defective ABS solenoid and ABS motor
power supply circuits)
Symptom
Abnormality is detected in the solenoid or motor power supply circuit
in the hydraulic unit assembly.
Order Item/components and probable cause Check or maintenance job
1 Defective battery Recharge or replace the battery.
Refer to “CHECKING AND CHARGING THE BATTERY”
on page 8-128.
2 Defective coupler between the battery
and the hydraulic unit assembly • Check the coupler for any pins that may be pulled out.
• Check the locking condition of the coupler.
• If there is a malfunction, repair it and connect the cou-
pler securely.
See TIP.
3 Open or short circuit in the wire harness
between the battery and the hydraulic unit
assembly • Replace if there is an open or short circuit.
• Between ABS ECU coupler and ABS motor fuse.
(red/blue–red/blue)
• Between ABS ECU coupler and ABS solenoid fuse.
(red–red)
4 Defective charging system Check the charging system.
Refer to “CHARGING SYSTEM” on page 8-11.