Mitsubishi Montero (2004+). Manual — part 1010

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-39

STEP 7. Check the ignition switch (IG2) circuit at motor
relay A harness connector B-53X.

(1) Remove the motor relay A.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 3 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 8.
NO : Go to Step 11.

AC204329 AD

MOTOR
RELAY A

AC204552

3 2 1

5 4

1 2 3

4 5

RELAY BOX CONNECTOR

AC

CONNECTOR: B-53X

B-53X

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-40

STEP 8. Check the power supply circuit at motor relay B
harness connector B-54X.

(1) Remove the motor relay B.

(2) Measure the voltage between terminal 4 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 9.
NO : Go to Step 12.

AC204329 AE

MOTOR
RELAY B

AC204553

3 2 1

5 4

1 2 3

4 5

RELAY BOX CONNECTOR

AB

CONNECTOR: B-54X

B-54X

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-41

STEP 9. Check the ignition switch (IG2) circuit at motor
relay B harness connector B-54X.

(1) Remove the motor relay B.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 3 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 14.
NO : Go to Step 13.

AC204329 AE

MOTOR
RELAY B

AC204553

3 2 1

5 4

1 2 3

4 5

RELAY BOX CONNECTOR

AC

CONNECTOR: B-54X

B-54X

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-42

STEP 10. Check the following harness wire.

• The wire between fusible link number 32 and motor relay A

connector B-53X (terminal 5)

Q: Is the harness wire damaged?

YES : Repair or replace it and then go to Step 25.
NO : Go to Step 25.

ACX01501AE

FUSIBLE LINK
No.32

BATTERY

FUSIBLE LINK No.32

AC204551

3 2 1

5 4

1 2 3

4 5

RELAY BOX CONNECTOR

AC

CONNECTOR: B-53X

B-53X