ABS (ANTI-LOCK BRAKE SYSTEM)
8-132
* The fault code number varies according to the vehicle conditions. For details, refer to the “Trouble-
shooting details”.
Troubleshooting details
Fault code No. 11, 25
55 Hydraulic unit assembly
(defective ABS ECU)
Abnormal data is detected in
the hydraulic unit assembly.
• Defective hydraulic unit
assembly
56 Hydraulic unit assembly
(abnormal internal power
supply)
Abnormality is detected in
the power supply circuit in
the hydraulic unit assembly.
• Defective hydraulic unit
assembly
63 Front wheel sensor power
supply (voltage of power
supply is low)
Power voltage supplied from
the ABS ECU to the front
wheel sensor is too low.
• Short circuit in the wire har-
ness between the front
wheel sensor and the
hydraulic unit assembly
• Defective front wheel sen-
sor
• Defective hydraulic unit
assembly
64 Rear wheel sensor power
supply (voltage of power
supply is low)
Power voltage supplied from
the ABS ECU to the rear
wheel sensor is too low.
• Short circuit in the wire har-
ness between the rear
wheel sensor and the
hydraulic unit assembly
• Defective rear wheel sen-
sor
• Defective hydraulic unit
assembly
Fault code No.
11
25
Item Front wheel sensor (intermittent pulses or no pulses)
Symptom
Front wheel sensor signal is not received properly. (Pulses are not
received or are received intermittently while the vehicle is travel-
ing.)
Order Item/components and probable cause Check or maintenance job
1 Foreign material adhered around the front
wheel sensor
Check the surface of the sensor rotor and wheel sensor
for foreign material, such as metal particles.
Clean the sensor rotor and wheel sensor if necessary.
2 Incorrect installation of the front wheel Check the components for looseness, distortion, and
bends.
Refer to “CHECKING THE FRONT WHEEL” on page
4-21.
3 Defective sensor rotor or incorrect instal-
lation of the rotor
Check the surface of the sensor rotor for damage.
Replace the sensor rotor if there is visible damage.
Refer to “MAINTENANCE OF THE FRONT WHEEL
SENSOR AND SENSOR ROTOR” on page 4-23.
4 Defective front wheel sensor or incorrect
installation of the sensor
Check the wheel sensor for damage and the installed
condition of the sensor. Repair or replace the wheel
sensor if necessary.
Refer to “MAINTENANCE OF THE FRONT WHEEL
SENSOR AND SENSOR ROTOR” on page 4-23.
Fault code
No.
Item Symptom Check point
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