Mitsubishi Montero (2004+). Manual - part 1070

SPECIAL TOOLS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-123

SPECIAL TOOLS

M1352000600727

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991958

A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826

MUT-III sub assembly

A: Vehicle 

communication 
interface (V.C.I.)

B: MUT-III USB cable
C: MUT-III main harness 

A (Vehicles with CAN 
communication 
system)

D: MUT-III main harness 

B (Vehicles without 
CAN communication 
system)

E: MUT-III main harness 

C (for Daimler Chrysler 
models only)

F: MUT-III measurement 

adapter

G: MUT-III trigger 

harness

MB991824-KIT
NOTE: G: MB991826 
MUT-III trigger harness is 
not necessary when 
pushing V.C.I ENTER key

Checking diagnostic 
trouble codes

CAUTION

MUT-III main harness B 
(MB991911) should be 
used. MUT-III main 
harness A and C should 
not be used for this 
vehicle.

MB991348
Test harness set

MB991496-OD

For checking of G and 
yawrate sensor

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

MB991348

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-124

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.

MB991223
Harness set
A:MB991219
Inspection harness

MB991223
MB991709-01

ABS sensor output 
voltage measurement

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991223

A

AB

B

C

D

AC204258AB

M-ASTC-ECU

TRANSFER
-ECU

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-125

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.
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.

.

TERMINAL NO.

Front left

Front right

Rear left

Rear right

30

27

46

60

31

28

47

61

AC204264 AB

E-119

E-120

E-119 HARNESS CONNECTOR:
COMPNENT SIDE

E-120 HARNESS CONNECTOR:
COMPNENT SIDE

ACX01114 AB

WHEN TURNING BY HAND

WHEN IDLING [5 - 6 km/h (3 - 4 mph) ]
D RARGE (AUTOMATIC TRANSAXLE)

10.0 ms/DIV
1V/DIV

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-126

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.

ABS VALVE RELAY CHECK

M1352010900127

HYDRAULIC BRAKE BOOSTER (HBB) 
HYDRAULIC UNIT CHECK

M1352001700589

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

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

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