Mitsubishi Lancer Evolution IV, Workshop Manual

Page: 284 / 391

ABS –
Troubleshooting
35B-9
Code No. 53: Motor relay system
Probable cause
This code is output under any of the following conditions:
D
No signals are input to the motor monitor when the motor relay is ON (motor
does not run, etc.).
D
A signal is being input to the motor monitor for 3 sec. or more when the motor
relay is OFF (motor continues running, etc.).
D
The motor relay is inoperative.
D
Defective motor relay
D
Defective harness or connector
D
Defective hydraulic unit
D
Defective ABS-ECU
Caution
(1) If the motor relay contacts fuse, the motor continues running even when the ignition switch
is turned OFF. In this case, immediately remove fusible link No. 8 (60 A) or disconnect the
A-22 connector or A-77 motor relay connector of the hydraulic unit. Overloading the motor
results in a rundown battery.
(2) Driving the motor through actuator test runs down the battery. After the test, run the engine
for some while.
OK
Check the trouble symptom.
NG
Check and repair the harness between
fusible link No. 8 and motor relay.
OK
Check the trouble symptom.
NG
Check and repair the harness between
motor relay and hydraulic unit.
OK
Check the trouble symptom.
NG
Check and repair the harness between
motor relay and ABS-ECU motor
monitor terminal No. 49.
OK
Check the motor for operation.
NG
Replace ABS-ECU.
OK
Check the following connectors:
A-22, A-77, B-25
NG
Repair
OK
Check the motor for operation.
NG
Replace the hydraulic unit.
OK
Measure at A-77 motor relay connector
and B-25 ABS-ECU connector.
D
Disconnect the connector and
measure at the harness side.
D
Continuity across the following
terminals
Motor relay ABS-ECU
side side
4 – 49
OK: Conducting
NG
Check the following connectors:
A-77, B-25
NG
Repair
OK
Measure at A-77 motor relay connector
and A-22 hydraulic unit connector.
D
Disconnect the connector and
measure at the harness side.
D
Continuity across the following
terminals
Motor relay Hydraulic
side unit side
4 – 12
OK: Conducting
NG
Check the following connectors:
A-22, A-77
NG
Repair
OK
Measure at A-77 motor relay connec-
tor.
D
Disconnect the connector and
measure at the harness side.
D
Voltage across 5 and body ground
OK: Battery voltage
NG
Check the following connector:
A-77
NG
Repair
Check the motor relay.
NG
Replace the motor relay.