Mitsubishi Montero (2002-2004). Manual - part 1042

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-39

STEP 4. Check the harness wire between dedicated fuse 
number 16 and stoplight switch connector D-123 terminal 
2.
NOTE:  After inspecting intermediate connectors D-28,D-125 
and stoplight switch connector D-123, inspect the wire. If inter-
mediate connectors D-28,D-125 and stoplight switch connector 
D-123 are damaged, repair or replace them. Refer to GROUP 
00E, Harness Connector Inspection 

P.00E-2

. If the connector 

has been repaired or replaced, go to Step 8.
Q: Is the harness wire between dedicated fuse number 16 

and stoplight switch connector D-123 terminal 2 
damaged?
YES : Repair it and then go to Step 8.
NO :  Check the harness wire between stoplight connector 

D-123 terminal 1 and stoplight, and repair if 
necessary. Then go to Step 8.

AC204676 AB

DETICATED FUSE No.16

RELAY BOX

AC204677

AC204701AB

CONNECTORS: D-28, D-123, D-125

D-28

D-125

D-123

38

1213

11

26

14

1

20

6

232425

37

31

36

30

10

9

2122

35

8

7

34

17

29

1819

5

4

1516

33

28

32

27

3

2

D-28

9

21

33

35

24

12

3 4

7

8

5 6

39

28

41

30

18

4243

31

1920

32

40

29

1617

38

27

15

37

36

26

14

13

25

2

1

34

23

11

10

22

D-125

4

2

3

1

D-123

HARNESS CONNECTOR:

COMPONENT SIDE

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-40

STEP 5. Using scan tool MB991502, check data list item 33: 
Stoplight switch.

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to data reading mode for item 33, 

Stoplight switch.

• ON with brake pedal stepped down.

• OFF with brake pedal released.

Q: Is the stoplight 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.00-6

.

NO :  Go to Step 6.

STEP 6. Check the stoplight switch circuit at M-ASTC-ECU 
connector E-119.
(1) Disconnect connector E-119 and measure at the harness 

side.

(2) Turn the stoplight switch ON.
(3) Measure the voltage between terminal 19 and ground. It 

should be approximately 12 volts (battery positive voltage).

Q: Is the voltage approximately 12 volts (battery positive 

voltage)?
YES : Replace the M-ASTC-ECU and then go to Step 8.
NO :  Go to Step 7.

AC205731AB

MB991502

16-PIN

AC203901

AC204627AH

CONNECTOR: E-119

E-119

HARNESS CONNECTOR:
COMPONENT SIDE

E-119

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-41

STEP 7. Check the harness wire between M-ASTC-ECU 
connector E-119 terminal 19 and stoplight connector D-123 
terminal 1.

AC203901

AC204627AC

CONNECTOR: E-119

E-119

HARNESS CONNECTOR: 
COMPONENT SIDE

E-119

AC204677

AC204701AC

CONNECTORS: D-29, D-123, D-125

D-29

D-125

D-123

D-29

9

21

33

35

24

12

3 4

7

8

5 6

39

28

41

30

18

4243

31

1920

32

40

29

1617

38

27

15

37

36

26

14

13

25

2

1

34

23

11

10

22

D-125

4

2

3

1

D-123

HARNESS CONNECTOR:

COMPONENT SIDE

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-42

NOTE: After inspecting joint connector D-29, D-116, intermedi-
ate connector E-111and D-125, inspect the wire. If joint connec-
tor D-29, D-116, intermediate connector E-111and D-125 are 
damaged, repair or replace them. Refer to GROUP 00E, Har-
ness Connector Inspection 

P.00E-2

.Then go to Step 8.

Q: Is the harness wire between M-ASTC-ECU connector E-

119 terminal 19 and stoplight switch connector D-123 
terminal 1 damaged?
YES : Repair it and then go to Step 8.
NO :  Go to Step 8.

STEP 8. Recheck for diagnostic trouble code.
Q: Does DTC 33 reset?

YES : Return to Step 1.
NO :  The procedure is complete.

AC204384

D-116

AE

CONNECTOR: D-116