Mitsubishi Montero (2004+). Manual - part 1027

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-107

STEP 2. Check the buzzer circuit at transfer-ECU 
connector E-104.

Disconnect transfer-ECU connector E-104.
Q: Does the buzzer still keep on sounding?

YES : Go to Step 3.
NO :  Replace the transfer-ECU (Refer to GROUP 23A, 

Transfer-ECU 

P.23A-571

). Then go to Step 5.

AC204728 AB

CONNECTOR: E-104

E-104

HARNESS CONNECTOR: 
COMPONENT SIDE

E-104

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-108

STEP 3. Check the following connectors.

• Buzzer connector E-107

• M-ASTC-ECU connector E-120

AC204692 AB

CONNECTOR: E-107

E-107

BUZZER 
CONNECTOR

E-107

AC203901

AC204627AE

CONNECTOR: E-120

M-ASTC-ECU CONNECTOR

E-120

E-120

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-109

• Transfer-ECU connector E-104

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 4.
NO :  Repair the faulty connector or terminal and then go to 

Step 5.

AC204728 AC

CONNECTOR: E-104

E-104

TRANSFER-ECU CONNECTOR

E-104

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-110

STEP 4. Check the following harness wires.

• The wire between buzzer connector E-107 (terminal 2) and 

M-ASTC-ECU connector E-120 (terminal 54)

AC204727AB

CONNECTOR: E-107

E-107

HARNESS 
CONNECTOR: 
COMPONENT 
SIDE

E-107

AC203901

AC204627AG

CONNECTOR: E-120

E-120

HARNESS CONNECTOR: 
COMPONENT SIDE

E-120