ABS <4WD> -
Troubleshooting
ABS <4WD> -
Troubleshooting
35B-8
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No. 11, 12, 13, 14 Wheel speed sensor system
(open circuit or short-circuit)
Probable cause
Code No. 21, 22, 23, 24 Wheel speed sensor system
Code Nos. 11, 12, 13, 14 are output when the open circuit or short-circuit
detection carried out by the ABS-ECU hardware circuit detects that there is an
open circuit or short-circuit in the (+) or (- ) wire in one of the four wheel speed
sensors and signals are consequently not being input.
D
Malfunction of wheel speed sensor
D
Malfunction of harness or connector
D
Malfunction of the ABS-ECU
Code No. 21, 22, 23, 24 are output at the following times:
D
If an open circuit cannot be verified, but one or more of the wheel speed
sensors does not output any signal when the vehicle speed is a certain
number of km/h or higher.
D
When a problem such as chipped or plugged- up rotor tooth is detected, or if
the sensor output drops and anti-skid control is continuously carried out due
to a malfunctioning sensor or a warped ABS rotor.
D
Malfunction of wheel speed sensor
D
Malfunction of harness or connector
D
Malfunction of ABS rotor
D
Excessive clearance between sensor and ABS
rotor
D
Malfunction of the ABS-ECU
D
Malfunction of wheel bearing
NG
NG
Replace the ABS-ECU.
NG
Repair
OK
Check the trouble symptoms.
OK
Check the following connector:
E-106
OK
Wheel bearing check
(Refer to GROUP 26, 27 -
On-vehicle Service.)
NG
Replace
OK
ABS rotor check
(Refer to P.35B-33.)
NG
Replace
Wheel speed sensor check
(Refer to P.35B-34.)
OK
Wheel speed sensor output voltage check (Refer to P.35B-27.)
OK
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 speed sensor installation check
NG
Repair
OK
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
NG
NG
Replace
NG
Repair
OK
Check the trouble
symptoms.
NG
Check the harness wire, and repair if necessary.
D
Between each wheel speed sensor and ABS-ECU
Wheel speed sensor check (Refer to P.35B-34.)
www.WorkshopManuals.co.uk
Purchased from www.WorkshopManuals.co.uk
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