Mitsubishi Montero (2002-2004). Manual - part 1012

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-73

STEP 4. Check the following harness wires.

• The wire between HBB connector B-17 (terminal 1) and 

ground

• The wire between HBB connector B-18 (terminal 33) and 

ground

Q: Is any harness wire damaged?

YES : Repair or replace it and then go to Step 8.
NO :  Go to Step 5.

AC204629 AE

CONNECTOR: B-17

B-17 (GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

1

2

3

4

5

6

7

8

B-17

AC204626 AB

CONNECTOR: B-18

B-18 (B)

HARNESS CONNECTOR : 
COMPONENT SIDE

34

32

31

33

35

B-18

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-74

STEP 5. Check the following connectors.

• M-ASTC-ECU connector E-119 and E-120

Check connectors, for loose, corroded or damaged terminals, 
or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 6.
NO :  Repair the faulty connector or terminal and then go to 

Step 8.

AC203901

AC204627 AD

CONNECTORS: E-119, E-120

E-119

M-ASTC-ECU CONNECTORS

E-119

E-120

E-120

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-75

STEP 6. Check the following harness wires.

• The wire between HBB connector B-17 (terminal 5) and M-

ASTC-ECU connector E-120 (terminal 57)

AC204629 AE

CONNECTOR: B-17

B-17 (GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

1

2

3

4

5

6

7

8

B-17

AC203901

AC204627AG

CONNECTOR: E-120

E-120

HARNESS CONNECTOR: 
COMPONENT SIDE

E-120

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-76

• The wire between HBB connector B-18 (terminal 35) and M-

ASTC-ECU connector E-119 (terminal 11)

Q: Is any harness wire damaged?

YES : Repair or replace it and then go to Step 8.
NO :  Go to Step 7.

STEP 7. Recheck for diagnostic trouble code.
(1) Erase the DTC memory.
(2) Recheck for diagnostic trouble code.
Q: Is DTC 56 set?

YES : Replace the M-ASTC-ECU (Refer to GROUP 35C, M-

ASTC-ECU 

P.35C-205

). Then go to Step 8.

NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points 

− How to Cope with 

Intermittent Malfunction 

P.00-6

.

AC204626 AB

CONNECTOR: B-18

B-18 (B)

HARNESS CONNECTOR : 
COMPONENT SIDE

34

32

31

33

35

B-18

AC203901

AC204627AC

CONNECTOR: E-119

E-119

HARNESS CONNECTOR: 
COMPONENT SIDE

E-119