Mitsubishi Montero (2004+). Manual — part 1004
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-15
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "HBB" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Select "Diagnostic Trouble Code."
8. If a DTC is set, it is shown.
9. Choose "Erase DTCs" to erase the DTC.
HOW TO READ DATA LIST
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
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "HBB" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Select "Data List."
8. Choose an appropriate item and select the "OK" button.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-16
HOW TO PERFORM ACTUATOR TEST
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
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "HBB" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Select "Actuator Test."
8. Choose an appropriate item and select the "OK" button.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-17
DIAGNOSTIC TROUBLE CODE CHART
M1351013700066
Follow the inspection chart that is appropriate for the
diagnostic trouble code.
NOTE: If the trouble marked by * has occurred, the M-ASTC-ECU sounds the buzzer continuously to inform
the trouble of the driver and protects the pump motor by activating the pump motor intermittently.
DTC
INSPECTION ITEM
DIAGNOSTIC CONTENT
REFERENCE PAGE
16
Battery positive voltage
M-ASTC-ECU power supply voltage is
extremely low or high
31
Ignition switch circuit
Open circuit at the HBB power supply
sub circuit
53
Pump motor
• Seizure of the pump motor*
• Abnormality at the current detection
circuit of the M-ASTC-ECU
54
Motor relay
Open circuit, short circuit or failure of the
motor relay coil
55
Pump motor circuit
Pump motor energized abnormally for
long period*
56
Pressure switch
• Open circuit at the pressure switch (for
pump motor control)
• Open circuit or short circuit at the
pressure switch (for low-pressure
warning)
57
Accumulator
Accumulator low-pressure abnormality*
58
M-ASTC-ECU (Power
supply drive circuit)
Pump motor drive circuit in the
M-ASTC-ECU abnormality
Replace the
M-ASTC-ECU (Refer to
GROUP 35C,
M-ASTC-ECU
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
TSB Revision
BASIC BRAKE SYSTEM
35A-18
HBB DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC 16: Battery Positive Voltage (M-ASTC-ECU Power Supply Voltage is Extremely Low or High)
CAUTION
If the battery voltage drops or rises while making this check, DTC 16 is set as an existing problem,
making it impossible to perform correct trouble diagnosis. Before carrying out the following diagno-
sis, test the battery and charge it if necessary.
AC204492AC
ASC-ECU Power Supply Circuit
AC204688 AB
CONNECTOR: D-116
D-116
AC204547AB
CONNECTORS: D-208, D-212
D-208
D-212
JUNCTION BLOCK
(FRONT VIEW)
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