Mitsubishi Lancer Evolution-VII Workshop Manual page 1273

INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code Nos.11, 12, 13 and 14 Wheel speed sensor
(open circuit or short circuit)
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.
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.
Wheel speed sensor installation check
Measure at the ABS-ECU connector B-123.
D Disconnect the connector, and measure at the harness side
connector.
D Resistances between 6 and 7, 8 and 9, 22 and 31, 29 and
30
OK: 1.24 - 1.64 kΩ
Wheel speed sensor output voltage check (Refer to P.35B-26.)
OK
Wheel
check
(Refer to P.35B-34.)
ABS rotor check
(Refer to P.35B-34.)
Wheel bearing check
(Refer to GROUP 26 and
GROUP 27 - On-vehicle
Service.)
Check the following connector: B-123
OK
Check the trouble
symptom.
NG
Replace the hydraulic unit and ABS-ECU.
ABS <4WD> -
OK
OK
NG
NG
speed sensor
OK
NG
OK
NG
Repair
Troubleshooting
Probable cause
D Malfunction of wheel speed sensor
D Malfunction of wiring harness or connector
D Malfunction of hydraulic unit and ABS-ECU
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 ABS rotor
D Malfunction of hydraulic unit and ABS-ECU
D Malfunction of wheel bearing
NG
Repair
NG
Wheel speed sensor check (Refer to P.35B-34.)
OK
Check the following connectors:
A-03, A-37, A-43 <L.H. drive vehicles>, C-111, C-128, C-136 <R.H.
drive vehicles>, C-146, D-04, D-10, D-30
OK
Check the trouble
Replace
symptom.
NG
Check the harness wire, and repair if necessary.
Replace
D Between each wheel speed sensor and ABS-ECU
35B-9
NG
Replace
NG
Repair