Mitsubishi Montero (2004+). Manual - part 1016

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-63

STEP 5. Check the power supply circuit at HBB harness 
connector B-17.

(1) Disconnect HBB connector B-17.

(2) Measure the voltage between terminal 2 and ground. The 

voltage should measure 0 volt.

Q: Is the measured voltage 0 volt?

YES : Go to Step 7.
NO :  Go to Step 6.

AC204629 AC

CONNECTOR: B-17

B-17 (GR)

HBB CONNECTOR

B-17

AC204633

1

2

3

4

5

6

7

8

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

B-17 
(GR)

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-64

STEP 6. Check the following harness wire.

• The wire between motor relay B connector B-54X (terminal 

5) and HBB connector B-17 (terminal 2)

Q: Is the harness wire damaged?

YES : Repair or replace it and then go to Step 15.
NO :  Go to Step 15.

AC204551

3  2  1

5     4

1  2  3

4     5

RELAY BOX CONNECTOR

AD

CONNECTOR: B-54X

B-54X

AC204629 AE

CONNECTOR: B-17

B-17 (GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

1

2

3

4

5

6

7

8

B-17

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-65

STEP 7. Check the following harness wires.

• The wire between motor relay A connector B-53X (terminal 

1) and M-ASTC-ECU connector E-120 (terminal 48)

AC204551

3  2  1

5     4

1  2  3

4     5

RELAY BOX CONNECTOR

AC

CONNECTOR: B-53X

B-53X

AC203901

AC204627AG

CONNECTOR: E-120

E-120

HARNESS CONNECTOR: 
COMPONENT SIDE

E-120

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-66

• The wire between motor relay B connector B-54X (terminal 

1) and M-ASTC-ECU connector E-119 (terminal 24)

Q: Is any harness wire damaged?

YES : Repair or replace it and then go to Step 15.
NO :  Go to Step 8.

AC204551

3  2  1

5     4

1  2  3

4     5

RELAY BOX CONNECTOR

AD

CONNECTOR: B-54X

B-54X

AC203901

AC204627AC

CONNECTOR: E-119

E-119

HARNESS CONNECTOR: 
COMPONENT SIDE

E-119