Mitsubishi Montero (2002-2004). Manual - part 1048

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-63

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check the valve relay.

Q: Is the relay damaged?

YES : Replace it and go to Step 10.
NO :  Go to Step 2.

STEP 2. Check the valve relay circuit at M-ASTC-ECU 
connector E-119 by backprobing.
(1) Do not disconnect connector E-119.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 18 and ground by 

backprobing. It should be less than 2V.

Q: Is the voltage less than 2V?

YES : Go to Step 3.
NO :  Go to Step 5. 

BATTERY VOLTAGE

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Not applied

2 

− 4

Less than 2 
ohms

2 

− 5

Open circuit

• Connect terminal 1 to the 

positive battery terminal

• Connect terminal 3 to the 

negative battery terminal

2 

− 4

Open circuit

2 

− 5

Less than 2 
ohms

AC204274

AB

VALVE RELAY

2

1

3

5

4

1

3

2

4
5

AC203901AE

CONNECTOR: E-119

E-119

AC204705

HARNESS CONNECTOR:
COMPONENT SIDE

AB

E-119

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-64

STEP 3. Check the valve relay monitor circuit at M-ASTC-
ECU connector E-120 by backprobing.
(1) Do not disconnect connector E-120.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 55 and ground by 

backprobing. It should be approximately 12 volts (battery 
positive voltage).

Q: Is the voltage approximately 12 volts (battery positive 

voltage)?
YES : Go to Step 4.
NO :  Go to Step 6. 

STEP 4. Check the M-ASTC-ECU connector E-120.
Q: Is the connector damaged?

YES : Repair it. Refer to GROUP 00E, Harness Connector 

Inspection 

P.00E-2

. Then go to Step 10.

NO :  Replace the M-ASTC-ECU and go to Step 10. 

AC203901AF

CONNECTOR: E-120

E-120

AC205737

CONNECTOR: E-120

E-120

AB

HARNESS CONNECTOR: 
HARNESS SIDE

AC203901AF

CONNECTOR: E-120

E-120

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-65

STEP 5. Check the harness wire between ignition switch 
(IG2) connector D-208 terminal 4 and M-ASTC-ECU 
connector E-119 terminal 18.

AC204624 AH

CONNECTORS: D-208, D-212

D-212

JUNCTION BLOCK
(FRONT VIEW)

HARNESS CONNECTOR: 
COMPONENT SIDE

3

4

10

11

8

9

1

2

5

6

7

D-212

D-208

JUNCTION BLOCK
CONNECTOR

D-208

AC203901

AC204627AC

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-66

NOTE:  After inspecting ignition switch (IG2) connector D-208 
and M-ASTC-ECU connector E-119, valve relay connector B-
21X, joint connector D-116, junction block connectors D-208, 
D-212 and intermediate connector E-111, inspect the wire. If 
ignition switch (IG2) connector D-208 and M-ASTC-ECU con-
nector E-106, valve relay connector B-21X, joint connector D-
116, junction block connectors D-208, D-212 and intermediate 
connector E-111 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 10.
Q: Is the harness wire between ignition switch (IG2) 

connector D-208 terminal 5 and M-ASTC-ECU connector 
E-119 terminal 18 damaged?
YES : Repair it and then go to Step 10.
NO :  Replace the M-ASTC-ECU and go to Step 10.

AC204706

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

5

B-21X

CONNECTOR: B-21X

AB

RELAY BOX CONNECTOR

AC204384

D-116

AE

CONNECTOR: D-116

AC204385

AC204673

CONNECTOR: E-111

AB

E-111

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

E-111