Mitsubishi Montero (2002-2004). Manual — part 999
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-21
STEP 3. Check the following harness wire.
• The wire between M-ASTC-ECU connector E-119 (terminal
9) and multi-purpose fuse number 17 (junction block)
NOTE: Also check intermediate connector E-111 for loose,
corroded, or damaged terminals, or terminals pushed back
in the connector. If intermediate connector E-111 is dam-
aged, 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 5.
Q: Is the harness wire damaged?
YES : Repair or replace it and then go to Step 5.
NO : Go to Step 5.
AC203901
AC204627AC
CONNECTOR: E-119
E-119
HARNESS CONNECTOR:
COMPONENT SIDE
E-119
AC203896AE
AC203896
MULTIPURPOSE FUSE NO.17
JUNCTION
BLOCK
MULTIPURPOSE
FUSE NO.17
AC204548AK
CONNECTOR: E-111
E-111
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-22
STEP 4. Recheck for diagnostic trouble code.
(1) Erase the DTC memory.
(2) Recheck for diagnostic trouble code.
Q: Is DTC 31 set?
YES : Replace the M-ASTC-ECU (Refer to GROUP 35C, M-
ASTC-ECU
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points
− How to Cope with
Intermittent Malfunction
STEP 5. Recheck for diagnostic trouble code.
(1) Erase the DTC memory.
(2) Recheck for diagnostic trouble code.
Q: Is DTC 31 set?
YES : Start over at Step 1.
NO : The procedure is complete.
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-23
DTC 53: Pump Motor (Seizure of the Pump Motor or Abnormality at the Current Detecting Circuit of
the M-ASTC-ECU)
AC204494 AB
Pump Motor Circuit
AC204545 AC
CONNECTORS: B-17, B-18
B-17 (GR)
B-18 (B)
AC204329 AC
CONNECTORS: B-53X, B-54X
B-53X
B-54X
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-24
.
CIRCUIT OPERATION
• The pump motor operates if the motor relay A or
motor relay B turn to ON.
• The M-ASTC-ECU monitors the pump motor (at
25 terminal).
• The M-ASTC-ECU monitors the power supply
current for the pump motor at 14 terminal, and
ground current at 12 terminal, respectively, to
know whether the pump motor is locked or not.
.
HBB DTC SET CONDITIONS
DTC 53 will be set when the pump motor is locked,
two ground lines are open circuit or poorly grounded,
or the current monitoring circuit is defective. If the
pump motor has been locked, the M-ASTC-ECU
sounds the buzzer continuously to inform the trouble
of the driver and protects the pump motor by activat-
ing it intermittently.
.
TROUBLESHOOTING HINTS
• Malfunction of the pump motor [Integrated with
the hydraulic brake booster (HBB)]
• Damaged wiring harness or connector
• Malfunction of the M-ASTC-ECU
• Malfunction of the master cylinder and hydraulic
unit assembly [Integrated with the hydraulic brake
booster (HBB)]
.
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
STEP 1. Check the sound of the HBB buzzer.
Q: Does the HBB buzzer sound?
YES : Check the pump motor for seizure, and replace the
pump motor if necessary. Then go to Step 10.
NO : Go to Step 2.
AC203901AE
CONNECTOR: E-119
E-119
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