Mitsubishi Montero (2004+). Manual - part 1071

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-127

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.

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.  Turn the ignition switch to the "LOCK" (OFF) position and 

set scan tool MB991958 as shown in the illustration.

4. After checking that the selector lever is in neutral, start the 

engine.

5. Use scan tool MB991958 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 MB991958 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.

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

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

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-128

Diagnosis Table

8. After inspection, disconnect the scan tool immediately after 

turning the ignition switch to the "LOCK" (OFF) position. 

SOLENOID VALVE CHECK

M1352010700123

Measure the resistance between the following solenoid valve 
terminals.

• Control solenoid valve IN (FR): Between terminals (19) − 

(34) 

• Control solenoid valve OUT (FR): Between terminals (20) − 

(34) 

• Control solenoid valve IN (FL): Between terminals (21) − 

(34)

• Control solenoid valve OUT (FL): Between terminals (22) − 

(34)

• Control solenoid valve IN (RR): Between terminals (15) − 

(34) 

• Control solenoid valve OUT (RR): Between terminals (16) − 

(34) 

• Control solenoid valve IN (RL): Between terminals (13) − 

(34) 

• Control solenoid valve OUT (RL): Between terminals (14) − 

(34)

• Select solenoid valve (FR): Between terminals (18) − (34)

• Select solenoid valve (FL): Between terminals (17) − (34)

Standard value:
 Control solenoid valve IN: 4.75 

− 5.25 Ω

 Control solenoid valve OUT: 2.0 

− 2.4 Ω

 Select solenoid valve: 3.5 

− 3.9 Ω

IN THE EVENT OF A DISCHARGED BATTERY

M1352003500365

Refer to GROUP 35C 

− On-vehicle Service 

P.35C-212

.

NO. OPERATION

NORMAL 
CONDITION

ABNORMAL 
CONDITION

PROBABLE CAUSE REMEDY

01

1. Depress brake pedal to lock 

wheel.

2. Using scan tool MB991958, 

select the wheel to be 
checked and force the 
actuator to operate.

3. Turn the selected wheel 

manually to check the 
change of brake force.

Brake force 
releases for 3 
seconds after 
locking.

Wheel does 
not lock when 
brake pedal is 
depressed.

Clogged brake line 
other than hydraulic 
brake booster (HBB)

Check and 
clean brake 
line

02

Clogged HBB

Replace HBB

03

Brake force is 
not released

Incorrect HBB brake 
tube connection

Connect 
correctly

04

HBB solenoid valve 
not functioning 
correctly

Replace HBB

ACX01116 AB

ABS CONTROL UNIT

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-129

ABS CONTROL UNIT

REMOVAL AND INSTALLATION

M1352009800074

Refer to GROUP 35C, M-ASTC-ECU 

P.35C-213

.

WHEEL SPEED SENSOR

REMOVAL AND INSTALLATION

M1352008300407

NOTE: The front and rear ABS rotors are integrated 
with the drive shaft and cannot be disassembled.

Post-installation Operation
• ABS Sensor Output Voltage Measurement (Refer to 

P.35B-124

).

AC204256AB

4

5

6

3

1

2

<FRONT>

<REAR>

7

FRONT WHEEL SENSOR 
REMOVAL STEPS

<<A>>

1. FRONT ABS SENSOR
2. FRONT ABS ROTOR PROTECTOR
3. HEAT PROTECTOR
4. FRONT ABS ROTOR WITH 

DRIVESHAFT (REFER TO GROUP 
26, DRIVESHAFT 

P.26-24

.)

REAR WHEEL SENSOR 
REMOVAL STEPS

<<B>>

5.

REAR ABS SENSOR

6.

REAR ABS ROTOR PROTECTOR

7.

REAR ABS ROTOR WITH 
DRIVESHAFT (REFER TO 
GROUP 27, DRIVESHAFT 

P.27-18

.)

WHEEL SPEED SENSOR

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-130

REMOVAL SERVICE POINTS

.

<<A>> FRONT ABS SENSOR REMOVAL
1. Remove the three splash shield clips and the two bolts 

shown in the illustration, and then disconnect the front ABS 
sensor connector.

CAUTION

Be careful when handling the projection at the tip of the 
ABS sensor and the toothed edge of the ABS rotor so as 
not to damage them by contacting other parts.
2. Remove the front ABS sensor.

.

<<B>> REAR ABS SENSOR REMOVAL

CAUTION

Be careful when handling the projection at the tip of the 
ABS sensor and the toothed edge of the ABS rotor so as 
not to damage them by contacting other parts.

INSPECTION

M1352008400318

.

ABS SENSOR CHECK
1. Check whether any metallic foreign material has adhered to 

the projection at the ABS sensor tip. Remove any foreign 
material. Also check whether the pole piece is damaged. 
Replace it with a new one if it is damaged.
NOTE: The projection can become magnetized due to the 
magnet inside the ABS sensor, causing foreign material to 
easily adhere to it. The projection may not be able to cor-
rectly sense the wheel rotation speed if foreign matter is on 
it or if it is damaged.

2. Measure the resistance between the ABS sensor terminals.

Standard value: 1.0 

− 1.5 kΩ

3. If the internal resistance of the ABS sensor is not within the 

standard value, replace it with a new ABS sensor.

ACX01118 AB

SPLASH SHIELD

FRONT

ACX01119 AB

REAR SIDE

FRONT SIDE