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ABS <2WD> -
Troubleshooting
35B-9
INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code Nos.11, 12, 13 and 14 Wheel speed sensor
(open circuit or short circuit)
Probable cause
Code Nos.21, 22, 23 and 24 Wheel speed sensor
Code Nos 11, 12, 13 and 14 are output if the ABS-ECU detects an open circuit or
short-circuit in the (+) wire or (- ) wire in any one of the four wheel speed sensors.
D Malfunction of wheel speed sensor
D Malfunction of wiring harness or connector
D Malfunction of hydraulic unit
Code Nos.21, 22, 23 and 24 are output in the following cases.
D When there is no input from any one of the four wheel speed sensors when travelling
at several km/h or more, even though open circuit can not be verified.
D When a chipped or blocked-up ABS rotor is detected and if the anti-lock system
operates continuously because a malfunctioning sensor or a warped ABS rotor
is causing sensor output to drop.
D Malfunction of wheel speed sensor
D Malfunction of wiring harness or connector
D Malfunction of ABS rotor
D Too much gap between the sensor and the rotor
D Malfunction of hydraulic unit
D Malfunction of wheel bearing
NG
Replace
OK
NG
Check the harness wire, and repair if necessary.
D Between each wheel speed sensor and ABS-ECU
NG
Repair
OK
Wheel bearing check(Re-
fer to GROUP 26 and
GROUP 27 - On-vehicle
Service.)
NG
Repair
NG
Replace the hydraulic unit.
OK
Check the trouble symp-
tom.
Check the following connector:
A-04
OK
ABS rotor check (Refer
to P.35B-29.)
NG
Replace
NG
Wheel speed sensor
check (Refer to
P.35B-29.)
NG
Replace
OK
Wheel speed sensor output voltage check (Refer to P.35B-19.)
OK
Check the trouble symp-
tom.
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
OK
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
NG
Wheel speed sensor check (Refer to P.35B-29.)
Wheel speed sensor installation check
NG
Repair