Mitsubishi Lancer Evolution IX. Manual - part 522

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-119

• When the ABS-ECU connector is disconnected, 

the circuit is earthed to illuminate the lamp. 

• The ABS-ECU controls the continuity to the ABS 

warning lamp by turning the power transistor in 
the unit "OFF" and "ON," respectively.

COMMENT ON TROUBLE SYMPTOM

The cause may be an open circuit in the ABS warn-
ing lamp power supply circuit, a blown ABS warning 
lamp bulb, or a short circuit to earth between the 
ABS warning lamp and the ABS-ECU.

PROBABLE CAUSES

The most likely causes for this case are:

• Blown fuse

• Damaged wiring harness or connector

• Burnt out ABS warning lamp bulb

• Malfunction of the brake modulator hydraulic unit 

(integrated with ABS-ECU)

DIAGNOSIS

STEP 1. Check the ABS warning lamp circuit at 
ABS-ECU connector B-118.

(1) Disconnect ABS-ECU connector B-118.

(2) Turn the ignition switch to the "ON" position.

Q: Does the ABS warning lamp illuminate?

YES : 

Replace the brake modulator hydraulic unit 

(integrated with ABS-ECU) (Refer to 

P.35B-143

). Then go to Step 10.

NO : 

Go to Step 2.

STEP 2. Check the power supply circuit. Voltage 
measurement at combination meter connector 
C-01.

(1) Disconnect combination meter connector C-01 

and measure at the harness side.

(2) Start the engine.
(3) Measure the voltage between terminal 9 and 

earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 3.

AC311127AB

B-118 (B)

Connector: B-118

28

32

34

12

11

33

30

21

9

10

22

31

7

8

29

20 19

24

2

26

4

5

6

27

18 17

3

25

16 15

1

23

13

14

Harness side

AC311206AB

Connector: C-01

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

Connector C-01
(harness side)

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-120

STEP 3. Check the following connectors.

•

Combination meter connector C-01

•

Junction block connectors C-211, C-214
Check the connectors for loose, corroded or dam-
aged terminals, or terminals pushed back in the con-
nector.

Q: Are the connectors and terminals in good 

condition?
YES : 

Go to Step 4.

NO : 

Repair it and then go to Step 10.

STEP 4. Check the following harness wire.

The wire between junction block connector C-211 
(terminal 6) and combination meter connector C-01 
(terminal 9)

Q: Is the harness wire damaged?

YES : 

Repair or replace it and then go to Step 10.

NO : 

Go to Step 10.

AC311161

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

Connector C-01 (harness side)

AD

Connector: C-01

AC311164

Connectors: C-211, C-214

C-214

C-211

AC

Junction block
(Front view)

4

6 5

3

2

1

Connector C-211
(Harness side)

Connector C-214
(Harness side)

21

7

16 15

17

18

20 19

1

2

3

4

5

6

23 22

24

25

28

26

27

9

8

10

11

14

12

13

AC311165

Connector: C-211 

AB

Junction block
(Front view)

Harness side

4

6 5

3

2

1

AC311161

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

Connector C-01 (harness side)

AD

Connector: C-01

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-121

STEP 5. Check the earth circuit. Resistance 
measurement at combination meter connector 
C-02.

(1) Disconnect combination meter connector C-02 

and measure at the harness side.

(2) Measure the resistance between terminal 48 and 

earth.

OK: 2 ohms or less

Q: Is the resistance 2 ohms or less? 

YES : 

Go to Step 8.

NO : 

Go to Step 6.

STEP 6. Check the following connector.

•

Combination meter connector C-02
Check the connector for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.

Q: Are the connector and terminals in good 

condition?
YES : 

Go to Step 7.

NO : 

Repair it and then go to Step 10.

STEP 7. Check the following harness wire.

The wire between combination meter connector C-02 
(terminal 48) and earth (No.7)

Q: Is the harness wire damaged?

YES : 

Repair or replace it and then go to Step 10.

NO : 

Go to Step 10.

AC311206AC

Connector: C-02

Connector C-02
(harness side)

31

43

37

34

32

33

35

36

40

38

39

41

42

48

44

45

4746

515049

C-02 (L)

AC311161

Connector: C-02 

AH

Connector C-02 (harness side)

31

43

37

34

32

33

35

36

40

38

39

41

42

48

44

45

4746

515049

C-02 (L)

AC311161

Connector: C-02 

AH

Connector C-02 (harness side)

31

43

37

34

32

33

35

36

40

38

39

41

42

48

44

45

4746

515049

C-02 (L)

AC311200AB

Earth

Windshield
wiper arm

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-122

STEP 8. Check the following connectors.

•

Combination meter connector C-01

•

Intermediate connector C-122

•

ABS-ECU connector B-118
Check the connectors for loose, corroded or dam-
aged terminals, or terminals pushed back in the con-
nector.

Q: Are the connectors and terminals in good 

condition?
YES : 

Go to Step 9.

NO : 

Repair it and then go to Step 10.

STEP 9. Check the following harness wire.

The wire between combination meter connector C-01 
(terminal 13) and ABS-ECU connector B-118 (termi-
nal 27)

Q: Is the harness wire damaged?

YES : 

Repair or replace it and then go to Step 10.

NO : 

Replace the combination meter (Refer to 
GROUP 54A, Combination Meter Assembly 

P.54A-56

). Then go to Step 10.

STEP 10. Retest the system.

Q: Does the ABS warning lamp illuminate for 3 

seconds when the ignition switch is turned to the 
"ON" position with engine stopped or upon 
start-up?
YES : 

The procedure is complete.

NO : 

Return to Step 1.

AC311161

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

Connector C-01 (harness side)

AD

Connector: C-01

AC311160AC

Connector: C-122

C-122 (L)

2

1

3

13

12

14

21

10

5

4

6

16

15

17

7 8 9

19

18

20

11

22

AC311127AB

B-118 (B)

Connector: B-118

28

32

34

12

11

33

30

21

9

10

22

31

7

8

29

20 19

24

2

26

4

5

6

27

18 17

3

25

16 15

1

23

13

14

Harness side

AC311161

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

Connector C-01 (harness side)

AD

Connector: C-01

AC311127AB

B-118 (B)

Connector: B-118

28

32

34

12

11

33

30

21

9

10

22

31

7

8

29

20 19

24

2

26

4

5

6

27

18 17

3

25

16 15

1

23

13

14

Harness side