ABS <4WD> -
Troubleshooting
35B-21
Inspection procedure 5
Abnormal brake operation
Probable cause
Braking operation varies depending on the driving conditions and the road
surface, which can make it difficult to diagnose a problem. However, if the
diagnosis codes displayed are normal, carry out the following inspection
procedure.
D
Incorrect wheel speed sensor installation
D
Malfunction of harness or connector
D
Malfunction of wheel speed sensor
D
Malfunction of ABS rotor
D
Foreign material adhering to speed sensor
D
Malfunction of wheel bearing
D
Malfunction of HBB
D
Malfunction of the ABS-ECU
Wheel speed sensor installation check
NG
Repair
OK
Check the hydraulic unit inside the hydraulic brake booster
(HBB). (Refer to P.35B-29.)
NG
Check the wheel speed sensor (Refer to P.35B-34.)
NG
OK
Check the ABS rotor (Refer to P.35B-33).
NG
Replace
OK
NG
Replace
OK
NG
Repair
OK
NG
NG
OK
Check the following connector:
E-106
OK
Check the trouble symptoms.
NG
Replace the ABS-ECU.
NG
Repair
Check the harness, and repair if necessary.
D
Between each wheel speed sensor and ABS-ECU
Replace
Measure at ABS-ECU connector E-106.
D
Disconnect the connector and measure at the harness
side.
D
Front: resistance between 10 – 23, 7 – 20
Rear: resistance between 8 – 21, 9 – 22
OK:
1.0 - 1.5 k
W
(Move the sensor harness and connector while checking at
this time.)
Check the following connectors:
A-04 <L.H.D.>, A-23, A-39,
D-124, D-143 <R.H.D.>, E-10, E-106, F-17, G-1 1, G-15
Wheel bearing check
(Refer to GROUP 26, 27 - On-vehicle Service.)
Check the trouble symptoms.
Wheel speed sensor output voltage check (Refer to P.35B-27.)
OK
www.WorkshopManuals.co.uk
Purchased from www.WorkshopManuals.co.uk
To Next Page
Loading...
Need help?
General
