Mitsubishi Montero Sport (2004+). Manual — part 809

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>

35C-43

STEP 1. Check the stoplight operation.
Q: Does the stoplight come on and go out correctly?

YES : Go to Step 4.
NO : Go to Step 2.

STEP 2. Check the stoplight switch installation condition.
Q: Is the stoplight switch installed properly?

YES : Go to Step 3.
NO : Repair it and then go to Step 8.

STEP 3. Check the stoplight switch continuity.
(1) Remove the stoplight switch. (Refer to GROUP 35A, Brake

Pedal

P.35A-27

.)

(2) Connect an ohmmeter to stoplight switch, and check

whether there is continuity when the plunger of the stoplight
switch is pushed in and when it is released.
Check for continuity between the terminals "a" and "b" of
the stoplight switch.

(3) The stoplight switch is in good condition if there is no

continuity when the plunger is pushed in to a depth of within
4 mm (0.16 inch) from the outer case edge surface, and if
there is continuity when it is released.

Q: Is the stoplight switch continuity incorrect?

YES : Replace it and then go to Step 8.
NO : Go to Step 4.

STEP 4. Using scan tool MB991958, check data list item 33:
Stoplight switch.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) Set scan tool MB991958 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

00E, How to Use Troubleshooting/Inspection Service
Points

− How to Cope With Intermittent Malfunction

P.00E-2

.

NO : Go to Step 5.

AC004299 AC

NO CONTINUITY

CONTINUITY

PLUNGER

a

b

AK303629AB

MB991911

MB991827

MB991824

16-PIN

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>

35C-44

STEP 5. Measure the stoplight switch circuit at ABS-ECU
connector A-85.

(1) Disconnect connector A-85 and measure at the harness

side.

(2) Turn the stoplight switch ON.

(3) Measure the voltage between terminal 13 and ground. It

should be approximately 12 volts (battery positive voltage).

Q: Is the battery positive voltage (approximately 12 volts)

present?
YES : Replace the hydraulic unit (integrated with ABS-ECU)

and then go to Step 7.

NO : Go to Step 6.

AC201944

CONNECTOR : A-85

A-85(B)

A-85 HARNESS
CONNECTOR:
COMPONENT SIDE

AD

18

12 11

20 19

10

3 2 1

13

14

22

23

17 16

25 24

15

8 7 6 5 4

21

9

26

AC202687

2 1

18

10

3

4

20

21

13 12

19

11

6

7

24 23

14

15

8

9

25

26

17 16

22

5

AB

A-85 HARNESS CONNECTOR:
COMPONENT SIDE

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>

35C-45

STEP 6. Check the harness wire between ABS-ECU
connector A-85 (terminal No.13) and stoplight switch
connector C-66 (terminal No.3).

AC201944

CONNECTOR : A-85

A-85(B)

A-85 HARNESS
CONNECTOR:
COMPONENT SIDE

AD

18

12 11

20 19

10

3 2 1

13

14

22

23

17 16

25 24

15

8 7 6 5 4

21

9

26

AC201959

CONNECTOR : C-66

C-66(B)

AC

1
3

4

2

C-66 HARNESS CONNECTOR:
COMPONENT SIDE

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>

35C-46

NOTE: After inspecting intermediate connectors C-17,C-10
and stoplight switch connector C-66, inspect the wire. If inter-
mediate connector C-17, C-10, or stoplight switch connector
C-66 is damaged, repair or replace it. Refer to GROUP 00E,
Harness Connector Inspection

P.00E-2

. If the connector has

been repaired or replaced, go to Step 7.
Q: Is the harness wire between ABS-ECU connector A-85

(terminal No.13) and stoplight switch connector C-66
(terminal No.3) damaged?
YES : Repair it and then go to Step 7.
NO : Go to Step 7.

STEP 7. Check the harness wire between fusible link No.8
and stoplight switch connector C-66 (terminal No.2).

AC201960

CONNECTORS : C-10, C-17

C-17

C-10

C-17

AB

C-10

17

7

15

5

16

6

12 13

10

3

11

14

4

8

1

9

2

8

19

7

6

5

16

15

17 18

4

3

2

10 11 12 13

1
9

14

AC201959

CONNECTOR : C-66

C-66(B)

AC

1
3

4

2

C-66 HARNESS CONNECTOR:
COMPONENT SIDE