Mitsubishi Montero (2004+). Manual — part 1009
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-35
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code.
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) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the DTC is set.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 55 set?
YES : Carry out the troubleshooting for DTC 55 (Refer to
NO : Go to Step 2.
STEP 2. Check the pump motor operation.
(1) Depress the pedal repeatedly more than 40 times until the
pedal depressing force feels heavy with the ignition switch
at the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
Q: Does the pump motor operate?
YES : Go to Step 22.
NO : Go to Step 3.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-36
STEP 3. Check the motor relay A.
CAUTION
Apply battery voltage according to the table below. Never
confuse the positive and negative battery terminals, or the
diode inside the relay will be damaged.
Q: Is the relay damaged?
YES : Replace the relay. Then go to Step 25.
NO : Go to Step 4.
STEP 4. Check the motor relay B.
CAUTION
Apply battery voltage according to the table below. Never
confuse the positive and negative battery terminals, or the
diode inside the relay will be damaged.
Q: Is the relay damaged?
YES : Replace the relay. Then go to Step 25.
NO : Go to Step 5.
BATTERY
CONNECTION
TESTER
CONNECTION
SPECIFIED
CONDITION
−
4
− 5
Open circuit
• Connect battery
terminal (+) to
terminal 3
• Connect battery
terminal (
−) to
terminal 1
4
− 5
Less than 2 ohms
AC204381
4
1
3
5
AC204329
ACX01808
AC
BRAKE FLUID
RESERVOIR
MOTOR
RELAY A
BATTERY
CONNECTION
TESTER
CONNECTION
SPECIFIED
CONDITION
−
4
− 5
Open circuit
• Connect battery
terminal (+) to
terminal 3
• Connect battery
terminal (
−) to
terminal 1
4
− 5
Less than 2 ohms
AC204381
4
1
3
5
AC204329
ACX01808
AD
MOTOR
RELAY B
BRAKE FLUID
RESERVOIR
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-37
STEP 5. Check the following connectors.
• Motor relay A connector B-53X
• Motor relay B connector B-54X
• HBB connectors B-17 and B-18
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 6.
NO : Repair the faulty connector or terminal. Then go to
Step 25.
AC204551
3 2 1
5 4
1 2 3
4 5
RELAY BOX CONNECTOR
AB
CONNECTORS: B-53X, B-54X
B-53X
B-54X
AC204629 AB
CONNECTORS: B-17, B-18
B-17 (GR)
B-18 (B)
B-17
B-18
HBB CONNECTORS
HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-38
STEP 6. Check the power supply circuit at motor relay A
harness connector B-53X.
(1) Remove the motor relay A.
(2) Measure the voltage between terminal 5 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 7.
NO : Go to Step 10.
AC204329 AD
MOTOR
RELAY A
AC204552
3 2 1
5 4
1 2 3
4 5
RELAY BOX CONNECTOR
AB
CONNECTOR: B-53X
B-53X
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