Mitsubishi Lancer Evolution VI. Manual - part 67

ABS  – 

Troubleshooting

35B-18

<EVOLUTION-IV>

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 hydraulic unit connector or A-77 motor relay connector. 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. 35.

OK

Check the trouble symptom.

NG

Replace ABS-ECU.

OK

Check the following connectors:
A-22, A-77, B-25

NG

Repair

OK

Check the motor for operation. 
(Refer to P.35B-43.)

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

–

35

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

NO

Measure at A-77 motor relay connector.

D

Disconnect the connector and
measure at the harness side.

D

Voltage across 5 and body ground
OK: System voltage

NG

Check the following connector:
A-77

NG

Repair

OK

Replace ABS-ECU.

Repair

NG

OK

Check the trouble symptom.

NG

Check the harness between motor
relay and ABS-ECU motor monitor
terminal No. 35.

OK

MUT-

II

 Actuator test

Motor operating sounds heard?

YES

Check the following connector:
B-25

NG

Repair

Check the motor relay. 
(Refer to P.35B-39.)

NG

Replace the motor relay.

ABS  – 

Troubleshooting

35B-19

<EVOLUTION-V, VI>

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 hydraulic unit connector or A-77 motor relay connector. 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 trouble symptom.

NG

Replace ABS-ECU.

OK

Check the following connectors:
A-22, A-77, B-25

NG

Repair

OK

Check the motor for operation. 
(Refer to P.35B-43.)

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

NO

Measure at A-77 motor relay connector.

D

Disconnect the connector and
measure at the harness side.

D

Voltage across 5 and body ground
OK: System voltage

NG

Check the following connector:
A-77

NG

Repair

OK

Replace ABS-ECU.

Repair

NG

OK

Check the trouble symptom.

NG

Check the harness between motor
relay and ABS-ECU motor monitor
terminal No.49.

OK

MUT-

II

 Actuator test

Motor operating sounds heard?

YES

Check the following connector:
B-25

NG

Repair

Check the motor relay. 
(Refer to P.35B-39.)

NG

Replace the motor relay.

ABS  – 

Troubleshooting

35B-20

<EVOLUTION-V, VI>

Code No.71 Acceleration sensor (lateral acceleration)
system

Probable cause

This code is output under either of the following conditions:

D

The output from the acceleration sensor (lateral acceleration) becomes 0.5 V or
less, or 4.5 V or more.

D

The acceleration sensor (lateral acceleration) harness is open- or short-circuited.

D

Defective acceleration sensor (lateral acceleration)

D

Defective harness or connector

D

Defective ABS-ECU

OK

Check the trouble symptom.

NG

Replace ABS-ECU.

OK

Check the trouble symptom.

NG

Check and repair the harness between
acceleration sensor (lateral accelera-
tion) and ABS-ECU.

OK

Check the trouble symptom.

NG

Check and repair the harness between
general-purpose fuse No. 6 and
acceleration sensor (lateral accelera-
tion).

OK

Replace ABS-ECU.

OK

Check the following connector:
B-24

NG

Repair

OK

Measure at B-24 ABS-ECU connector.

D

Connect the connector.

D

Ignition switch: ON

D

Voltage across 17 and 18
OK: 2.4  – 2.6 V 

(horizontal position)

NG

Check the following connectors:
B-24, D-32, B-52

NG

Repair

NG

Check the harness between accelera-
tion sensor (lateral acceleration) and
ABS-ECU.

NG

Repair

OK

Check the trouble symptom.

OK

Check the acceleration sensor (lateral
acceleration). (Refer to P.35B-46.)

NG

Replace

(1) NG

Check the following connectors:
D-32, B-49, B-75

NG

Repair

Check the following connector:
D-32, B-49, B-75

NG

Repair

(2) NG

Measure at D-32 acceleration sensor
(lateral acceleration) connector.

D

Disconnect the connector and
measure at the harness side.

D

Ignition switch: ON

(1) Voltage across 1 and body ground

OK: System voltage

(2) Continuity across 3 and body

ground
OK: Conducting

ABS  – 

Troubleshooting

35B-21

INSPECTION CHART FOR TROUBLE SYMPTOMS

Get an understanding of the trouble symptoms and check according to the inspection procedure chart.

Trouble symptoms

Inspection pro-
cedure No.

Reference page

Communication between the MUT-

II

 and the whole system is not possible.

1

35B-22

Communication between the MUT-

II

 and the ABS-ECU is not possible.

2

35B-23, 24

When the ignition key is turned to “ON” (engine stopped), the ABS warning lamp
does not illuminate.

3

35B-25

Even after the engine is started, the ABS warning lamp remains illuminated.

4

35B-26

After the ignition key is turned to “ON”, the ABS warning lamp blinks once, and
when turned to “START”, it illuminates. When returned to “ON”, the lamp
flashes once, and then switches off.

5

35B-27

When the ignition key is turned to “START”, the ABS warning lamp does not
illuminate.

6

35B-28

Brake operation is abnormal.

7

35B-28

Caution
(1) If steering movements are made when driving at high speed, or when driving on road surfaces

with low frictional resistance, or when passing over bumps, the ABS may operate even though
sudden braking is not being applied. Because of this, when getting information from the customer,
check if the problem occurred while driving under such conditions as these.

(2) During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such

phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent
the wheels from locking and is not an abnormality.