Mitsubishi Montero Sport (2004+). Manual - part 795

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <RWD>

35B-61

ON-VEHICLE SERVICE

BLEEDING

M1352001500273

CAUTION

Use the specified brake fluid. Don't use a mixture of the 
specified brake fluid and another non-specified fluid.

Specified brake fluid: Conforming to DOT 3 or DOT 4

BLEEDING THE MASTER CYLINDER

Refer to GROUP 35A, On-vehicle Service 

P.35A-19

.

BLEEDING THE BRAKE LINE

CAUTION

Be sure to filter/strain the brake fluid being added to the 
master cylinder reservoir tank. Debris may damage the 
hydraulic unit.
Refer to GROUP 35A, On-vehicle Service 

P.35A-19

.

MB991223
Harness set
A: MB991219
Inspection harness

MB991223
MB991709-01

Wheel speed sensor 
output voltage 
measurement

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991223

A

AB

B

C

D

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <RWD>

35B-62

WHEEL SPEED SENSOR OUTPUT VOLTAGE 
MEASUREMENT

M1352001600548

Required Special Tool:

• MB991219: Inspection Harness

1. Lift up the vehicle and release the parking brake.
2. Disconnect the ABS-ECU connector, and then use special 

tool MB991219 to measure the output voltage at the 
harness side connector.

3. Manually turning the wheel to be measured by 1/2 to 1 

turn/second, measure the output voltage with a voltmeter or 
oscilloscope.

Output voltage:

• When measured with voltmeter: 70 mV or more

• When measured with oscilloscope (maximum voltage): 200 

mV or more

Probable causes of low output voltage

• Wheel speed sensor pole piece-to-ABS rotor clearance too 

large

• Faulty wheel speed sensor

4. To observe the waveform with an oscilloscope: 

• Front Wheels:

RWD: Turn the wheels manually at a constant speed.
4WD: Shift into D-range and drive the wheels.

• Rear Wheels:

Shift into D-range and drive the wheels.

NOTE: Waveform may also be observed by driving the vehi-
cles.
NOTE: The output waveform is low when the wheel speed is 
low. Similarly, it will be higher as the wheel speed increases. 
Waveform may also be observed by driving the vehicle.

TERMINAL NO.

Front left

Front right

Rear left

Rear right

20

18

3

1

21

19

4

2

AC004884

AC000949 AC

WHEN TURNED MANUALLY

IN "D" RANGE, IDLING
[5 

− 6 km/h (3 − 4 mph)]

[10.0 ms/DIV 1 V/DIV]

[10.0 ms/DIV 1 V/DIV]

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <RWD>

35B-63

POINTS IN WAVEFORM MEASUREMENT

NOTE: The wheel speed sensor cable moves in relation to 
motion of the front or rear suspension. Therefore, it is likely that 
it has an open circuit only when driving on rough roads but it 
functions normally when driving on smooth roads. It is recom-
mended to observe sensor output voltage waveform also under 
special conditions, such as driving on a rough road.

HYDRAULIC UNIT CHECK

M1352001700608

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

• The roller of the braking force tester and the tire should 

be dry during testing.

• When testing the front brakes, apply the parking brake. 

When testing the rear brakes, stop the front wheels 
with chocks.

1. Jack up the vehicle. Then support the vehicle with rigid 

racks at the specified jack-up points or place the front or rear 
wheels on the rollers of the braking force tester.

2. Release the parking brake, and feel the drag force (drag 

torque) on each road wheel. When using the braking force 
tester, take a reading of the brake drag force.

SYMPTOM

PROBABLE CAUSES

REMEDY

Too small or zero waveform 
amplitude

Faulty wheel speed sensor

Replace sensor

Incorrect pole piece-to-ABS rotor clearance

Adjust clearance

Waveform amplitude fluctuates 
excessively (This is no problem if the 
minimum amplitude is 100 mV or 
more).

Axle hub eccentric or with large runout

Replace hub

Noisy or disturbed waveform

Open circuit in wheel speed sensor

Replace sensor

Open circuit in harness

Repair harness

Incorrectly mounted wheel speed sensor

Mount correctly

ABS rotor with missing or damaged teeth

Replace ABS rotor

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <RWD>

35B-64

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.
3. Connect scan tool MB991958 to the data link connector.
4. After checking that the selector lever is in "P" range, start the 

engine.

5. Select "Interactive Diagnosis" from the start-up screen.
6. Select "System Select."
7. Choose "ABS" from the "CHASSIS" tab.
8. Select "Actuator Test" from "ABS" screen
9. Choose an appropriate item for hydraulic unit check.

NOTE: The ABS system will switch to the scan tool mode 
and the ABS warning light will illuminate.
NOTE: When the ABS has been interrupted by the fail-safe 
function, scan tool MB991958 actuator testing cannot be 
used.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC000954 AI

SCAN TOOL ACTUATOR TEST
(ITEM NO.01, 02, 03) START

1 s

3 s

4 s

DEPRESSED

RELEASED

PRESSURE INCREASE

PRESSURE DECREASE

PRESSURE HOLD

LOCK

DRAG FORCE
WHEN THE
PEDAL IS FREE

PEDAL
OPERATION

SOLENOID
VALVE
POSITION

CHECKING
THE BRAKE
FORCE