ABS – Troubleshooting
35B-3
2. INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE 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 ABS-ECU
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 8 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 Too much gap between the sensor and the rotor
D Malfunction of ABS-ECU
D Malfunction of wheel bearing
NG
Check the harness wire, and repair
if necessary.
D Between each wheel speed sensor
and ABS-ECU
NG
Replace the ABS-ECU.
OK
Check the trouble symptom.
OK
Check the following connector:
B-24
NG
Repair
NG
Repair
OK
Wheel bearing check
OK
ABS rotor check
OK
Wheel speed sensor output voltage
check (Refer to P.35B-17.)
NG
Wheel speed sensor check
NG
Replace
OK
Check the following connectors:
B-24, B-52, B-17, A-26, A-50, D-04,
D-14, D-19
OK
Check the trouble symptom.
OK
Measure at the ABS-ECU connector
B-24.
D Disconnect the connector, and
measure at the harness side
connector.
D Resistances between 8 and 21,
10 and 19, 7 and 20, 9 and 22
OK: 1.4 – 1.8 kΩ
NG
Wheel speed sensor check
(Refer to P.35B-29.)
NG
Replace
Wheel speed sensor installation check
NG
Replace
NG
Replace
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