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
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
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
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