Mitsubishi Montero (2004+). Manual — part 1024
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-95
STEP 2. Check the brake warning light drive circuit at
M-ASTC-ECU harness connector E-121.
(1) Disconnect M-ASTC-ECU connector E-121 and check at
the harness connector (component side).
(2) Turn the ignition switch to the "ON" position.
(3) Connect terminal 81 to a body ground.
Q: Does the brake warning light turn off?
YES : Replace the M-ASTC-ECU (Refer to GROUP 35C,
M-ASTC-ECU
NO : Go to Step 3.
AC203901
AC204627AP
CONNECTOR: E-121
M-ASTC-ECU CONNECTOR
E-121
E-121
AC204691AB
E-121
HARNESS CONNECTOR:
COMPONENT SIDE
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-96
STEP 3. Check the following harness wire.
• The wire between combination meter connector D-03 (ter-
minal 55) and M-ASTC-ECU connector E-121 (terminal 81)
NOTE: Also check intermediate connector E-111 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector E-111 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 4.
Q: Is the harness wire damaged?
YES : Repair or replace it and then go to Step 4.
NO : Replace the combination meter (Refer to GROUP
54A, Combination Meter and Vehicle Speed Sensor
) and then go to Step 4.
AC204690 AC
CONNECTOR: D-03
D-03 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
D-03
AC203901
AC204627AR
CONNECTOR: E-121
E-121
E-121
HARNESS CONNECTOR:
COMPONENT SIDE
AC204548AK
CONNECTOR: E-111
E-111
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-97
STEP 4. Retest the system.
Q: Does the brake warning light turn on for three seconds
and then turn off on start-up?
YES : The procedure is complete.
NO : Start over at Step 1.
INSPECTION PROCEDURE 3: DTC 53 <Seizure of the Pump Motor>, DTC55 or DTC57 is set, but the
Buzzer does not Sound.
AC204502AB
Buzzer Circuit
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-98
.
CIRCUIT OPERATION
• The M-ASTC-ECU controls the buzzer by turning
the power transistor in the M-ASTC-ECU ON and
OFF.
• The M-ASTC-ECU outputs the buzzer-sounding
signal at the malfunction of the hydraulic brake
booster (HBB). (Also the M-ASTC-ECU turns on
the brake warning light at the same time.)
• The buzzer will sound under the following cases:
a. When the pump motor is locked (DTC 53 is
set).
b. When the pump motor is energized abnor-
mally for long period (DTC 55 is set).
c. When the accumulator pressure is abnormally
low (DTC 57 is set).
d. When the solenoid valve temperature in the
M-ASTC-ECU is abnormally high (DTC is not
set).
.
TECHNICAL DESCRIPTION (COMMENT)
The cause is probably an open circuit at the buzzer
circuit, a malfunction of the buzzer or a failure of
buzzer drive transistor in the M-ASTC-ECU.
.
TROUBLESHOOTING HINTS
• Damaged wiring harness or connector
• Malfunction of the buzzer
• Malfunction of the M-ASTC-ECU
.
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
AC204688 AB
CONNECTOR: D-116
D-116
AC204547AB
CONNECTORS: D-208, D-212
D-208
D-212
JUNCTION BLOCK
(FRONT VIEW)
AC204548AH
CONNECTORS: E-107, E-111
E-111
E-107
AC203901AF
CONNECTOR: E-120
E-120
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