Mitsubishi Montero (2002-2004). Manual — part 1018
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-97
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
STEP 1. Check the following connectors.
• Buzzer connector E-107
• M-ASTC-ECU connector 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 2.
NO : Repair the faulty connector or terminal and then go to
Step 7.
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-98
STEP 2. Check the buzzer circuit at M-ASTC-ECU harness
connector E-120.
(1) Disconnect M-ASTC-ECU connector E-120 and check at
the harness connector (component side).
(2) Turn the ignition switch to the "ON" position.
(3) Connect terminal 54 to body ground.
Q: Does the buzzer sound?
YES : Replace the M-ASTC-ECU (Refer to GROUP 35C, M-
ASTC-ECU
NO : Go to Step 3.
STEP 3. Check the buzzer.
(1) Remove the buzzer (Refer to
(2) Connect the battery to the buzzer as shown on the
illustration.
Q: Does the buzzer sound?
YES : Go to Step 4.
NO : Replace the buzzer (Refer to
). Then go to
Step 7.
AC203901
AC204627AE
CONNECTOR: E-120
M-ASTC-ECU CONNECTOR
E-120
E-120
AC204726 AB
E-120
HARNESS CONNECTOR:
COMPONENT SIDE
ACX00680AB
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-99
STEP 4. Check the buzzer power supply circuit at buzzer
harness connector E-107.
(1) Disconnect buzzer connector E-107, and measure at the
harness connector (component side).
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground. The
voltage should measure approximately 12 volts (battery
positive voltage).
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 6.
AC204692 AB
CONNECTOR: E-107
E-107
BUZZER
CONNECTOR
E-107
ACX01879
2
1
AC
HARNESS CONNECTOR:
COMPONENT SIDE
E-107
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-100
STEP 5. Check the following harness wire.
• The wire between buzzer connector E-107 (terminal 2) and
M-ASTC-ECU connector E-120 (terminal 54)
Q: Is the harness wire damaged?
YES : Repair or replace it and then go to Step 7.
NO : Go to Step 7.
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
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