Mitsubishi Lancer Evolution IV, Workshop Manual

Page: 198 / 391

REAR AXLE –
Troubleshooting <AYC>
27-15
Code No. 65: ABS monitor system Probable cause
This code is output when ABS is considered to remain activated (motor relay remains
ON) for a continuous 1-min.-or-more period.
It is output also when there is an open-circuit in the harness between ABS motor
relay and AYC-ECU.
D
Defective harness or connector
D
Defective AYC-ECU
OK
Replace AYC-ECU.
NG
Check the harness between ABS
motor relay and AYC-ECU.
NG
Repair
OK
Check the trouble symptom.
Is the ABS diagnosis code output?
YES
Troubleshooting
NO
Check the following connector:
B-95
NG
Repair
Code No. 71: Proportioning valve system Probable cause
This code is output when the proportioning valve control circuit is open- or short-circuited.
D
Defective proportioning valve
D
Defective harness or connector
D
Defective AYC-ECU
OK
Check and repair the harness between
proportioning valve and body ground.
OK
Check the trouble symptom.
OK
Measure at F-27 proportioning valve
connector.
D
Disconnect the connector and
measure at the harness side.
D
Continuity across 2 and body
ground
OK: Conducting
NG
Check the following connectors:
F-27, F-30
NG
Repair
Measure at F-27 proportioning valve
connector.
D
Disconnect the connector and
measure at the proportioning valve.
D
Resistance across 2 – 3
OK: 4.7
Ω
or less
NG
Replace the hydraulic unit.
OK
Replace AYC-ECU.
NG
Check the harness between propor-
tioning valve and AYC-ECU.
NG
Repair
OK
Check the trouble symptom.
NG
Check the following connectors:
B-96, B-94, D-06, F-30, F-27
NG
Repair