Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 768

Inspection Procedure 7
Faulty ABS operation
This varies depending on the driving conditions and the road surface conditions, so
problem diagnosis is difficult. However, if a normal diagnosis code is displayed, carry
out the following inspection.
Wheel speed sensor installation check
Wheel speed sensor output voltage check (Refer to P.35B-26.)
Wheel speed sensor 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 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
Check the trouble symptom.
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
(The sensor harness and connector should be moved while
these inspections are carried out.)
Check the following connector: B-123
Measure at the 4WD-ECU connector C-43. <ABS signal check>
D Disconnect the connector, and measure at the harness side
connector.
D Carry out the ABS signal of the actuator test from the ABS
menu of the MUT-II.
D Voltage between 49 and body earth
OK: Less than 1.0V for initial 10 seconds, then system voltage
ABS signal check
D Display the ABS signal of the service data from ACD (4WD)
menu of MUT-II.
OK: Displays OFF
D Brake in safety area, operate the ABS (possible to inspect
in first velocity of approx. 30km/h)
OK: Displays ON (in operating ABS)
ABS <4WD> -
OK
NG
OK
OK
OK
OK
NG
OK
OK
OK
Troubleshooting
Probable cause
D Improper installation of wheel speed sensor
D Malfunction of wiring harness or connector
D Malfunction of wheel speed sensor
D Malfunction of ABS rotor
D Foreign material adhering to wheel speed sensor
D Malfunction of wheel bearing
D Malfunction of hydraulic unit and ABS-ECU
NG
Repair
OK
Hydraulic unit check (Refer to P.35B-28.)
NG
Replace the wheel speed sensor.
NG
Repair
NG
Repair
NG
Repair
NG
Check the harness wire.
D Between each wheel speed sensor and ABS-ECU
NG
Repair
NG
Check the following connectors: B-123, C-128 <R.H. drive
vehicles>, C-43
OK
Check the trouble symptom.
Check the harness wire.
D Between 4WD-ECU and ABS-ECU
OK
NG
Check the trouble symptom.
Replace the hydraulic unit and ABS-ECU.
35B-21
NG
Repair
NG
NG
Repair
NG