Mitsubishi Lancer Evolution IX. Manual — part 517

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-99

INSPECTION PROCEDURE 5: In the Inspection with the M.U.T.-II/III Data List, the Parking Brake
Switch is not Turned ON or Turned OFF.

OPERATION

The ABS-ECU monitors the parking brake switch to
optimise the ABS control.

COMMENT ON TROUBLE SYMPTOM

The cause may be an open or a short circuit between
the parking brake switch and the ABS-ECU.

PROBABLE CAUSES

The most likely causes for this case are:

• Damaged wiring harness or connector

• Malfunction of the parking brake switch

• Malfunction of the brake modulator hydraulic unit

(integrated with ABS-ECU)

Parking Brake Switch Circuit

ABS-ECU

PARKING
BRAKE
SWITCH

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

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-100

DIAGNOSIS

STEP 1. M.U.T.-II/III data list.

CAUTION

To prevent damage to M.U.T.-II/III, always turn the
ignition switch to the "LOOK" (OFF) position
before connecting or disconnecting M.U.T.-II/III.

(1) Connect M.U.T.-II/III as shown in the illustration.
(2) Start the engine.

(3) Set M.U.T.-II/III to data reading mode for following

item.

• Item No.29: Parking brake switch

OK:

Q: Is the parking brake switch input normal?

YES :

This malfunction is intermittent. Refer to

GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to Cope With Intermittent Malfunction

P.00-5

.

NO :

Go to Step 2.

STEP 2. Check the parking brake switch circuit at
ABS-ECU connector B-118.

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

measure at the harness side.

AC207179AB

M.U.T.-II

16-PIN

<Using the M.U.T.-II>

AC210056

AC

MB991911

16-PIN

MB991827

MB991824

<Using the M.U.T.-III>

Checking requirement

Display

Pull the parking brake lever

ON

Release the parking brake lever

OFF

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)

AG

B-118 (B)

Connector: B-118

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-101

(2) Check for continuity between terminal 1 and

earth with pulling or releasing the parking brake
lever.

OK: If the parking brake lever is pulled,
there should be no continuity, and if the
parking brake lever is released, there
should be continuity (less than 2 ohms).

Q: Does continuity exist when the parking brake lever

is released, and dose continuity not exist when the
parking brake lever is pulled?
YES :

Go to Step 3.

NO :

Go to Step 4.

STEP 3. 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 6.

NO :

Go to Step 6.

STEP 4. Check the following connectors.

•

ABS-ECU connector B-118

•

Intermediate connector C-124

• Joint connector C-23

•

Parking brake switch connector D-28
Check the connectors for loose, corroded or dam-
aged terminals, or terminals pushed back in the con-
nector.

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

AC212218

Connectors: C-23, C-124

C-23 (B)

C-124

AG

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-23

Connector C-124

AC211902

AH

Connector: D-28

D-28 (B)

1

Harness side

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-102

Q: Are the connectors and terminals in good

condition?
YES :

Go to Step 5.

NO :

Repair it and then go to Step 6.

STEP 5. Check the following harness wire.

The wire between parking brake switch connector
D-28 (terminal 1) and ABS-ECU connector B-118
(terminal 1)

Q: Is the harness wire damaged?

YES :

Repair or replace it and then go to Step 6.

NO :

Replace the parking brake switch (Refer to
GROUP 36, Parking Brake Lever

P.36-4

).

Then go to Step 6.

STEP 6. Check whether the diagnosis code is
reset.

Q: Does the parking brake switch turn ON/OFF

normally in the inspection by M.U.T.-II/III data list?
YES :

The procedure is complete.

NO :

Return to Step 1.

AC211902

AH

Connector: D-28

D-28 (B)

1

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