Mitsubishi Lancer Evolution IX. Manual — part 519

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-107

STEP 9. Check the stop lamp switch circuit.
Measure the voltage at ABS-ECU connector
B-118.

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

measure at the harness side.

(2) Depress the brake pedal to turn on the stop lamp

switch.

(3) Measure the voltage between terminal 19 and

earth.

OK: System voltage

Q: IIs the check result normal?

YES :

Go to Step 12.

NO :

Go to Step 10.

STEP 10. Check the following connectors.

•

ABS-ECU connector B-118

•

Joint connector C-105

• Intermediate connector C-124

• Stop lamp switch connector C-102

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 11.

NO :

Repair it and then go to Step 13.

AC212153

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)

AH

B-118 (B)

Connector: B-118

AC211901AD

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

AC212218AI

Connectors: C-102, C-105, C-124

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

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-105

Connector C-124

C-102

4

1

2

3

Connector C-102
(harness side)

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-108

STEP 11. Check the following harness wire.

The wire between stop lamp switch connector C-102
(terminal 1) and ABS-ECU connector B-118 (terminal
19)

Q: Is the harness wire damaged?

YES :

Repair or replace it and then go to Step 13.

NO :

Go to Step 13.

STEP 12. Check the following connector.

•

ABS-ECU connector B-118
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 :

Replace the brake modulator hydraulic unit

(integrated with ABS-ECU) (Refer to

P.35B-143

). Then go to Step 13.

NO :

Repair it and then go to Step 13.

STEP 13. Retest the system.

Q: Is the neutral position learning of the steering

wheel sensor detected by the ABS system?
YES :

The procedure is complete.

NO :

Return to Step 1.

INSPECTION PROCEDURE 7: Faulty ABS Operation

COMMENT ON TROUBLE SYMPTOM
(COMMENT)

The cause depends on driving and road surface con-
ditions, so diagnosis may be difficult. However, if no
diagnosis code is set, carry out the following inspec-
tion.

PROBABLE CAUSES

The most likely cause for this case is:

• Malfunction of the brake modulator hydraulic unit

DIAGNOSIS

Check the brake modulator hydraulic unit (Refer to

P.35B-140

). If the brake modulator hydraulic unit

(integrated with ABS-ECU) is malfunctioning, replace
it. Then check that the malfunction symptom is elimi-
nated.

AC211265DH

Connector: C-102

C-102

4

1

2

3

Harness side

AC211901AD

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

AC211901AD

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-109

INSPECTION PROCEDURE FOR
TROUBLE SYMPTOMS <R.H. drive
vehicle>

INSPECTION PROCEDURE 1: Communication between the M.U.T.-II/III and all the Systems is Not
Possible.

OPERATION

A battery positive voltage is applied on the diagnosis
connector power terminal (terminal 16). The earth
terminals (terminal 4, 5) are earthed to the vehicle
body.

COMMENT ON TROUBLE SYMPTOM

The cause is probably a defect in power supply cir-
cuit or the earth circuit.

PROBABLE CAUSES

The most likely causes for this case are:

• Malfunction of the diagnosis connector

• Damaged wiring harness or connector

FUSIBLE
LINK

1

DIAGNOSIS
CONNECTOR

FRONT SIDE

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

Diagnosis Connector Power Supply and Earth Circuit

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-110

DIAGNOSIS

STEP 1. Check the power supply circuit. Voltage
measurement at diagnosis connector C-14.

Measure the voltage between terminal 16 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 2.

STEP 2. Check the following connectors.

•

Diagnosis connector C-14

•

Junction block connectors C-212, C-214

•

Intermediate connector C-126
Check the connectors for loose, corroded or dam-
aged terminals, or terminals pushed back in the con-
nector.

AC311203AB

C-14(B)

Connector: C-14

Diagnosis connector

AC311202 AB

C-14(B)

Connector: C-14

AC311164

Connectors: C-212, C-214

C-214

C-212 (B)

AD

Junction block
(Front view)

Connector C-212
(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

1

Connector C-214
(harness side)

AC311160AF

Connector: C-126

C-126

1

2

3

Harness side