Mitsubishi Montero Sport (2004+). Manual - part 812

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>

35C-55

STEP 3. Check the harness wire between ABS-ECU 
connector A-85 (terminal No.23 and 24) and data link 
connector C-69 (terminal No.1 and 7).

NOTE: After inspecting intermediate connectors C-10 and 
C-17, inspect the wires. If intermediate connector C-10 or C-17 
is damaged, repair or replace it. Refer to GROUP 00E, Har-
ness Connector Inspection 

P.00E-2

. If the connector has been 

repaired or replaced, go to Step 4.
Q: Is any harness wire between ABS-ECU connector A-85 

(terminal No.23 and 24) and data link connector C-69 
(terminal No.1 and 7) damaged?
YES : Repair them and go to Step 5.
NO :  Go to Step 4.

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

AC201948

CONNECTOR : C-69

C-69(B)

AD

8

16

7

15

6

14

5

13

4

12

3

11

2

10

1

9

C-69 HARNESS 
CONNECTOR:
FRONT VIEW

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

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>

35C-56

STEP 4. Check the harness wires between ABS-ECU 
connector A-86 (terminal No.32 and 34) and ground.

Q: Are any harness wires between ABS-ECU connector 

A-86 (terminal No.32 and 34) and ground damaged?
YES : Repair them and then go to Step 5.
NO :  Replace the hydraulic unit (integrated with ABS-ECU) 

and go to Step 5.

STEP 5. Retest the system.

Q: Does the scan tool communicate with the ABS system?

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

AC201944

CONNECTOR : A-86

A-86(GR)

A-86 HARNESS 
CONNECTOR:
COMPONENT SIDE

AE

32
34

31
33

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>

35C-57

INSPECTION PROCEDURE 2: When the Ignition Switch is Turned to the "ON" Position (Engine 
Stopped or After Start-up), the ABS Warning Light does not Illuminate.

JUNCTION 
BLOCK

ABS-ECU

ABS
RELAY

COMBINATION
METER

JOINT 
CONNECTOR (1)

JOINT 
CONNECTOR (5)

IGNITION
SWITCH (IG2)

IGNITION
SWITCH (IG1)

ABS Warning Light Circuit

AC004837 AL

CONNECTORS: A-35, A-85

A-85 (B)

A-35 (B)

AC004711

CONNECTORS: C-04, C-05

AC

C-05

C-04

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>

35C-58

.

CIRCUIT OPERATION

• The ABS warning light power is supplied from the 

ignition switch. The ABS-ECU grounds the circuit 
to illuminate the light by operating the ABS relay. 

• The ABS-ECU controls the continuity to the ABS 

warning light by turning the power transistor in 
the unit "ON" and "OFF" to turn the ABS relay 
"OFF" and "ON".

.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be: an open circuit in the ABS warn-
ing light circuit, a blown light bulb, or a short circuit to 
ground between the ABS relay and the ABS-ECU.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case:)

• Blown fuse

• Damaged wiring harness or connector

• Burnt out ABS warning light bulb

• Malfunction of the ABS relay

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

.

AC004261

CONNECTORS: C-11, C-14, C-17

AR

C-17

C-14

C-11

AC004490

CONNECTOR: D-06

AE

JUNCTION BLOCK
(FRONT)

D-06

AC003457

D-13

D-08

CONNECTORS: D-08, D-13

AC