Mitsubishi Lancer Evolution IX. Manual - part 521

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-115

Q: Are the connectors and terminals in good 

condition?
YES : 

Go to Step 3.

NO : 

Repair it and then go to Step 9.

STEP 3. Check the following harness wire.

The wire between junction block connector C-211 
(terminal 2) and ABS-ECU connector B-118 (terminal 
10)

Q: Is the harness wire damaged?

YES : 

Repair or replace it and then go to Step 9.

NO : 

Go to Step 9.

STEP 4. Check the earth circuit. Resistance 
measurement at ABS-ECU connector B-118.

Measure the resistance between terminal 12 and 
earth, and terminal 34 and earth.

OK: 2 ohms or less

Q: Is the resistance 2 ohms or less? 

YES : 

Go to Step 7.

NO : 

Go to Step 5.

STEP 5. Check the following connector.

•

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

Q: Are the connector and terminals in good 

condition?
YES : 

Go to Step 6.

NO : 

Repair it and then go to Step 9.

AC311165

Connector: C-211 

AB

Junction block
(Front view)

Harness side

4

6 5

3

2

1

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

AC311168AD

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

Connector B-118
(harness side)

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

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-116

STEP 6. Check the following harness wires.

•

The wire between ABS-ECU connector B-118 (termi-

nal 12) and earth

• The wire between ABS-ECU connector B-118 

(terminal 34) and earth

Q: Is any harness wire damaged?

YES : 

Repair or replace it and then go to Step 9.

NO : 

Go to Step 9.

STEP 7. Check the following connectors.

•

Diagnosis connector C-14

•

Joint connectors C-21, C-23, C-105

• Intermediate connectors C-122, C-124

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

AC311204 AB

Earth

AC311202 AB

C-14(B)

Connector: C-14

AC311161AG

Connector: C-23

C-23 (B)

AC311205AB

Connectors: C-21, C-105, C-122, C-124

C-122 (L)

C-21

C-105

C-124

33

22

11

28

17

16

15

14

13

12

25

2324

2627

3

1 2

4 5

21

20

19

18
2930

32

31

7

6

8

10

9

2

1

3

13

12

14

21

10

5

4

6

16

15

17

7 8 9

19

18

20

11

22

18

3

16

15

14

1 2

17

4 5

8

20

19

6 7

2122

9 10

25

13

24

23

12

11

Connector C-21

Connector C-122

Connector C-105

Connector C-124

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-117

•

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 8.

NO : 

Repair it and then go to Step 9.

STEP 8. Check the following harness wires.

•

The wire between ABS-ECU connector B-118 (termi-

nal 2) and diagnosis connector C-14 (terminal 7)

• The wire between ABS-ECU connector B-118 

(terminal 5) and diagnosis connector C-14 (termi-
nal 1)

Q: Is any harness wire damaged?

YES : 

Repair or replace it and then go to Step 9.

NO : 

Replace the brake modulator hydraulic unit 
(integrated with ABS-ECU) (Refer to 

P.35B-143

). Then go to Step 9.

STEP 9. Retest the system.

Q: Does the M.U.T.-II/III communicate with the ABS 

system?
YES : 

The procedure is complete.

NO : 

Return to Step 1.

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

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

AC311202 AB

C-14(B)

Connector: C-14

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-118

INSPECTION PROCEDURE 3: When the Ignition Key is Turned to the "ON" position (Engine Stopped), 
the ABS Warning Lamp does not Illuminate.

OPERATION

• The ABS warning lamp power is supplied from 

the ignition switch. The ABS-ECU earths the cir-
cuit to illuminate the lamp.

• The ABS-ECU illuminates the ABS warning lamp 

for 3 seconds while running self-check. This lamp 
is illuminated for 3 seconds upon start-up or 
when the ignition switch is turned to the "ON" 
position with engine stopped.

IGNITION
SWITCH (IG1)

COMBINATION
METER

ABS-ECU

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

ABS Warning Lamp Circuit