ABS <4WD> ± Troubleshooting
35B-18
Inspection Procedure 5
Faulty ABS operation
Probable cause
This varies depending on the driving conditions and the road surface conditions,
so problem diagnosis is difficult. However, if a normal diagnosis code is displayed,
carry out the following inspection.
D Improper installation of wheel speed sensor
D Malfunction of wiring harness or connector
D Malfunction of wheel speed sensor
D Malfunction of ABS rotor
D Foreign material adhering to wheel speed sensor
D Malfunction of wheel bearing
D Malfunction of hydraulic unit and ABS-ECU
NG
Replace the hydraulic unit and ABS-ECU.
OK
Check the trouble symptom.
OK
Check the following connector: A-58
NG
Measure at the ABS-ECU connector A-58.
D Disconnect the connector, and measure at the harness side
connector.
D Resistances between 17 and 18, 15 and 14, 4 and 5, 2 and
1
OK: 1.30 ± 1.58 kΩ
(The sensor harness and connector should be moved while
these inspections are carried out.)
NG
OK
Check the trouble symptom.
OK
Check the following connectors:
A-58, C-25 <L.H. drive vehicles>, C-24 <R.H. drive vehicles>,
A-24, A-85, D-24, D-28
NG
Repair
OK
Wheel bearing check (Refer to GROUP 26 and GROUP 27 ±
On-vehicle Service.)
NG
Repair
OK
ABS rotor check (Refer to P.35B-30.)
NG
Repair
NG
Wheel speed sensor check (Refer to P.35B-30.)
NG
Replace the wheel speed sensor.
OK
Wheel speed sensor output voltage check (Refer to P.35B-22.)
OK
Hydraulic unit check (Refer to P.35B-24.)
Wheel speed sensor installation check
NG
Repair
Check the harness wire.
D Between each wheel speed sensor and ABS-ECU
NG
Repair
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