Mitsubishi Montero (2004+). Manual — part 1026
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-103
STEP 6. Check the following harness wire.
• The wire between buzzer connector E-107 (terminal 1) and
junction block connector D-208 (terminal 4)
NOTE: Also check joint connector D-116, intermediate connec-
tor E-111 and junction block connector D-212 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If joint connector D-116, intermediate connector
E-111 or junction block connector D-212 is damaged, repair or
replace the damaged component(s) as described in GROUP
00E, Harness Connector Inspection
. If the connector
has been repaired or replaced, go to Step 7.
AC204727AB
CONNECTOR: E-107
E-107
HARNESS
CONNECTOR:
COMPONENT
SIDE
E-107
AC204624 AC
CONNECTOR: D-208
D-208
JUNCTION BLOCK
(FRONT VIEW)
D-208 JUNCTION BLOCK
CONNECTOR
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-104
Q: Is the harness wire damaged?
YES : Repair it and then go to Step 7.
NO : Go to Step 7.
AC204689 AB
CONNECTOR: D-116
D-116
D-116
JOINT CONNECTOR (4):
JOINT PIN SIDE
AC204548AK
CONNECTOR: E-111
E-111
AC204624 AD
CONNECTOR: 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
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-105
STEP 7. Retest the system.
(1) Apply a chock to the wheel.
(2) Start the engine.
(3) When 120 seconds or more have been elapsed since the
engine was started, release the parking brake lever and
fully depress the brake pedal repeatedly 15 to 20 times
within 10 seconds.
Q: Does the buzzer sound?
YES : The procedure is complete.
NO : Start over at Step 1.
INSPECTION PROCEDURE 4: The Buzzer does not Stop Sounding.
NOTE: This diagnosis procedure is limited to cases where communication with the scan tool is possible
(M-ASTC-ECU power supply is normal) and no DTC sets.
.
CIRCUIT OPERATION
• The M-ASTC-ECU and the transfer-ECU controls
the buzzer by turning the power transistor in the
ECU ON and OFF.
• The M-ASTC-ECU outputs the buzzer-sounding
signal when an abnormality occurs on the
hydraulic brake booster (At the same time, the
M-ASTC-ECU turns on the brake warning light).
AC204503AB
Brake Warning Light Circuit
AC204548AI
CONNECTORS: E-104, E-107, E-114
E-104
E-107
E-114
AC203901AF
CONNECTOR: E-120
E-120
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-106
• The transfer-ECU outputs the buzzer-sounding
signal when an abnormality occurs on the active
trac 4WD II system.
.
TECHNICAL DESCRIPTION (COMMENT)
The cause is probably an M-ASTC-ECU or trans-
fer-ECU malfunction.
.
TROUBLESHOOTING HINTS
• Damaged wiring harness or connector
• Malfunction of the M-ASTC-ECU
• Malfunction of the transfer-ECU
• Malfunction of the buzzer
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
STEP 1. Check the buzzer circuit at M-ASTC-ECU
connector E-120.
Disconnect M-ASTC-ECU connector E-120.
Q: Does the buzzer still keep on sounding?
YES : Go to Step 2.
NO : Replace the M-ASTC-ECU (Refer to GROUP 35C,
M-ASTC-ECU
AC203901
AC204627AE
CONNECTOR: E-120
M-ASTC-ECU CONNECTOR
E-120
E-120
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