Mitsubishi Montero (2004+). Manual — part 1003

BASIC BRAKE SYSTEM DIAGNOSIS

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BASIC BRAKE SYSTEM

35A-11

STEP 6. Retest the system.

Q: Is the symptom eliminated?

YES :

The procedure is complete.

NO :

Start over at Step 1. If a new symptom
appears, refer to the appropriate symptom
chart (

P.35A-6

).

INSPECTION PROCEDURE 8: Groaning, Clicking or Rattling Noise when Brakes are not Applied.

DIAGNOSIS

STEP 1. Check for looseness of the wheel nuts.

Q: Are the wheel nuts loose?

YES :

Tighten to 108

± 10 N⋅m (80 ± 7 ft-lb). Then

go to Step 4.

NO :

Go to Step 2.

STEP 2. Check for looseness of the caliper
installation bolt.

Q: Is the caliper installation bolt loose?

YES :

Tighten to 113

± 9 N⋅m (83 ± 7 ft-lb) for the

front caliper, or 100

± 10 N⋅m (74 ± 7 ft-lb)

for the rear caliper. Then go to Step 4.

NO :

Go to Step 3.

STEP 3. Check the wheel bearings for wear,
damage or dryness.

For front wheel, refer to GROUP 26, Hub and
Knuckle Assembly

P.26-18

. For rear wheel, refer to

GROUP 27, Rear Hub Assembly

P.27-13

.

Q: Is there fault?

YES :

Apply grease or replace the wheel bearings.

Then go to Step 4.

NO :

Go to Step 4.

STEP 4. Retest the system.

Q: Is the symptom eliminated?

YES :

The procedure is complete.

NO :

Start over at Step 1. If a new symptom
appears, refer to the appropriate symptom
chart (

P.35A-6

).

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

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BASIC BRAKE SYSTEM

35A-12

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

INTRODUCTION

M1351012800059

The hydraulic brake booster (HBB) accumulates the
high-pressure brake fluid in the accumulator by oper-
ating the pump motor. Even though the working
sound of the pump motor can be heard during opera-
tion, this sound is usually generated at normal opera-
tion of the HBB and is not an indication of a
malfunction.

HBB Diagnostic Trouble Code Detection
Conditions

HBB diagnostic trouble codes (HBB DTCs) are set
under different conditions, depending on the mal-
function detected. Most HBB DTCs will only be set
during vehicle operation. Some HBB DTCs will also
be set during the HBB self-check immediately after
the engine is started.

After erasing an HBB DTC, duplicate the HBB DTC
set conditions to see if it resets. Depending on the
detection timing and set conditions for the specific
HBB DTC, you must either drive the vehicle or turn
the engine off and restart it. To set the proper condi-
tions for that DTC again, refer to "HBB DTC SET
CONDITIONS" for each HBB DTC that you are trying
to reset.

DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1351012900056

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find an
HBB fault.
1. Gather information about the problem from the

customer.

2. Verify that the condition described by the

customer exists.

3. Check the vehicle for any HBB DTC.
4. If you cannot verify the condition and no HBB

DTC sets, it can be assumed that the malfunction
is intermittent. Refer to GROUP 00, How to use
Troubleshooting/Inspection Service Points

− How

to Cope with Intermittent Malfunctions

P.00-6

.

5. If you can verify the condition but no HBB DTC

sets, or the system cannot communicate with the
scan tool, check that the basic brake system is
operating properly.

• If the basic brake system is not operating prop-

erly, refer to "Basic Brake System Diagnosis"
(

P.35A-6

).

• If the basic brake system is operating properly,

refer to "Symptom Chart" (

P.35A-82

).

6. If an HBB DTC sets, record the number of the

DTC, then erase the DTC from the memory using
the scan tool.

7. Duplicate the HBB DTC set conditions to see if

the same HBB DTC will set again.

• If the same HBB DTC sets again, perform the

diagnostic procedures for the DTC. Refer to

P.35A-17

.

• If you cannot make the same HBB DTC set

again, it can be assumed that the malfunction is
intermittent. Refer to GROUP 00, How to use
Troubleshooting/Inspection Service Points

− How

to Cope with Intermittent Malfunctions

P.00-6

.

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

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BASIC BRAKE SYSTEM

35A-13

BRAKE WARNING LIGHT CHECK

M1351013000056

Check that the brake warning light illuminates as follows:
1. Check that the brake fluid level in the reservoir is between

the "MIN" and the "MAX" lines.

2. Choke the wheels and release the parking brake.
3. When the ignition switch is turned to the "ON" position, the

brake warning light illuminates.

4. When the ignition switch is turned from the "START" position

back to the "ON" position, the brake warning light illuminates
for approximately 3 seconds and then switches off.

5. If the illumination is other than the above, check the

diagnostic trouble codes.

TROUBLE CODE DIAGNOSIS

M1351011200098

Retrieving HBB Diagnostic Trouble Codes

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

AC000682 AB

BRAKE
WARNING
LIGHT

IGNITION
SWITCH

ILLUMINATED

NOT
ILLUMINATED

APPROXIMATELY 3S

LOCK, ACC

ON

START

BRAKE WARNING LIGHT

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

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BASIC BRAKE SYSTEM

35A-14

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. Ensure that the ignition switch is at the "LOCK" (OFF)

position.

2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824

and the personal computer.

4. Connect special tool MB991911 to special tool MB991824.
5. Connect special tool MB991911 to the data link connector.
6. Turn the power switch of special tool MB991824 to the "ON"

position.
NOTE: When special tool MB991824 is energized, special
tool MB991824 indicator light will be illuminated in a green
color.

7. Start the MUT-III system on the personal computer.
NOTE: Disconnecting scan tool MB991958 is the reverse of the
connecting sequence, making sure that the ignition switch is at
the "LOCK" (OFF) position.

Erasing HBB Diagnostic Trouble Codes

NOTE: If the M-ASTC-ECU functions have stopped due to the
fail-safe function, the HBB diagnostic trouble code cannot be
erased.

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.

NOTE: If the battery voltage is low, diagnostic trouble codes
will not be set. Check the battery if scan tool MB991958
does not display.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR