Mitsubishi Montero (2002-2004). Manual — part 1062
ON-VEHICLE SERVICE
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-119
ON-VEHICLE SERVICE
ABS SENSOR OUTPUT VOLTAGE CHECK
M1352001600333
Required Special Tool:
• MB991219: Inspection Harness
NOTE: Two ECUs of the same type are situated up and down
in a row at the inner part of the floor console. The upper side
ECU is the M-ASTC-ECU. The lower side ECU is the transfer
ECU.
1. Lift up the vehicle and release the parking brake.
2. Disconnect the M-ASTC-ECU connector, and then use
special tool MB991219 to measure the output voltage at the
harness side connector.
3. Manually turn the wheel to be measured 1/2 to 1 turn/
second. Measure the output voltage with a voltmeter or
oscilloscope.
Output voltage:
• Minimal voltmeter reading: 42 mV
• Maximum voltmeter reading: 300 mV
• Minimal oscilloscope reading: 120 mV
• Maximum oscilloscope reading: 600 mV
Probable causes of low output voltage
• ABS sensor pole piece-to-ABS rotor clearance too large
• Faulty ABS sensor
NOTE: Check the connection of the sensor harness and con-
nector before using the oscilloscope.
TERMINAL NO.
Front left
Front right
Rear left
Rear right
30
27
46
60
31
28
47
61
AC204258AB
M-ASTC-ECU
TRANSFER
-ECU
AC204264 AB
E-119
E-120
E-119 HARNESS CONNECTOR:
COMPNENT SIDE
E-120 HARNESS CONNECTOR:
COMPNENT SIDE
ON-VEHICLE SERVICE
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-120
4. To observe the waveform with an oscilloscope: Start the
engine, move the transfer selector lever to the "4H" position
and the transmission selector lever to "D" range, and then
spin the wheel.
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.
.
POINTS IN WAVEFORM MEASUREMENT
NOTE: The ABS 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 recommended to observe sensor output voltage waveform also under special conditions,
such as driving on a rough road.
ACX01114AB
WHEN TURNING BY HAND
WHEN IDLING [5 - 6 km/h (3 - 4 mph) ]
D RARGE (AUTOMATIC TRANSAXLE)
10.0 ms/DIV
1V/DIV
SYMPTOM
PROBABLE CAUSES
REMEDY
Too small or zero waveform
amplitude
Faulty ABS sensor
Replace sensor
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 ABS sensor
Replace sensor
Open circuit in harness
Repair harness
Incorrectly mounted ABS sensor
Mount correctly
ABS rotor with missing or
damaged teeth
Replace ABS rotor
ON-VEHICLE SERVICE
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-121
ABS VALVE RELAY CHECK
M1352010900127
HYDRAULIC BRAKE BOOSTER (HBB)
HYDRAULIC UNIT CHECK
M1352001700341
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
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.
BATTERY VOLTAGE
TESTER
CONNECTION
SPECIFIED
CONDITION
Not applied
2
− 4
Less than 2
ohms
2
− 5
Open circuit
• Connect terminal 1 to the
positive battery terminal
• Connect terminal 3 to the
negative battery terminal
2
− 4
Open circuit
2
− 5
Less than 2
ohms
AC204274
AB
VALVE RELAY
2
1
3
5
4
1
3
2
4
5
ON-VEHICLE SERVICE
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-122
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
3. Turn the ignition switch to the "LOCK" (OFF) position and
set scan tool MB991502 as shown in the illustration.
4. After checking that the selector lever is in neutral, start the
engine.
5. Use scan tool MB991502 to force-drive the actuator.
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 MB991502 actuator testing cannot be
used.
6. Turn the wheel by hand and check the change in braking
force when the brake pedal is depressed. When using the
braking force tester, depress the brake pedal until the
braking force is at the following values, and check that the
braking force changes to the brake drag force instep 2 when
the actuator is force-driven.The result should be as shown in
the diagram above.
Front wheel: 785
− 981 N (176 − 220 lb)
Rear wheel: 785
− 981 N (176 − 220 lb)
7. If the result of inspection is abnormal, repair according to the
Diagnosis Table below.
ACX01539AE
MB991502
16-PIN
ACX01115 AB
INCREASE IN PRESSURE
STEADY PRESSURE
SCAN TOOL ACTUATOR TEST (ITEM No. 01, 02, 03, 04) START
REDUCTION IN PRESSURE
(WHEN NOT WORKING)
PEDAL
OPERATION
SOLENOID VALVE
POSITION
CHECKING THE
BRAKE FORCE
DEPRESSED
RELEASED
1 s
2 s
LOCK
DRAG FORCE WHEN
PEDAL IS RELEASED
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