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ABS <2WD> -
Troubleshooting
35B-16
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
NG
Replace the hydraulic unit.
OK
Check the trouble symptom.
OK
Check the following connector:
A-04
NG
Measure at the ABS-ECU connector A-04.
D Disconnect the connector, and measure at the harness side
connector.
D Resistances between 20 and 19, 2 and 1, 22 and 23, 6 and
5
OK:
1.0 - 1.5 kW
(The sensor harness and connector should be moved while
these inspections are carried out.)
NG
Repair
OK
Check the trouble symptom.
OK
Check the following connectors:
<L.H. drive vehicles>
A-09, C-115, C-75, A-39, C-74, E-14, E-13, E-11, C-123, E-12
<R.H. drive vehicles>
A-09, A-41, A-39, C-115, C-75, E-14, E-13, E-11, C-121, E-12
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-29.)
NG
Repair
NG
Wheel speed sensor check (Refer to P.35B-29.)
NG
Replace the wheel speed sensor .
OK
Wheel speed sensor output voltage check (Refer to P.35B-19.)
OK
Hydraulic unit check (Refer to P.35B-22.)
Wheel speed sensor installation check
NG
Repair