Mitsubishi Pajero Pinin. Manual - part 251

ABS <4WD> – 

Hydraulic Unit and ABS-ECU

35B-27

<R.H. drive vehicles>

 15 Nm

2

3

1

4

3

5

Removal steps

1. ABS warning lamp relay

A

A

"

2. Harness connector

"

A

A

3. Brake pipe connection

A

B

"

4. Hydraulic unit and ABS-ECU
5. Hydraulic unit bracket assembly

REMOVAL SERVICE POINTS

A

A

"

HARNESS CONNECTOR DISCONNECTION

Move the lock lever of the ABS-ECU connector as shown
in the illustration, and then disconnect the harness connector.

Hydraulic unit
and ABS-ECU

Lock lever

ABS <4WD> – 

Hydraulic Unit and ABS-ECU

35B-28

A

B

"

HYDRAULIC UNIT AND ABS-ECU REMOVAL

Caution
1.

The hydraulic unit assembly is heavy, and so care
should be taken when removing it.

2.

The hydraulic unit assembly is not to be disassembled;
its nuts and bolts should absolutely not be loosened.

3.

The hydraulic unit assembly must not be dropped
or otherwise subjected to impact shocks.

4.

The hydraulic unit assembly must not be turned upside
down or laid on its side.

INSTALLATION SERVICE POINT

"

A

A

BRAKE PIPE CONNECTION

Connect the pipes to the hydraulic unit assembly as shown
in the illustration.
1.

To the proportioning valve (Rear brake, LH)

2.

To the proportioning valve (Rear brake, RH)

3.

From the master cylinder (Primary)

4.

From the master cylinder (Secondary)

5.

To the front brake (RH)

6.

To the front brake (LH)

3

4

6

1

5

2

ABS <4WD> – 

Wheel Speed Sensor

35B-29

WHEEL SPEED SENSOR

REMOVAL AND INSTALLATION

Post-installation Operation
Wheel Speed Sensor Output Voltage Check 
(Refer to P.35B-22.)

1

2

4

3

<FRONT>

<REAR>

A

A

"

1. Front wheel speed sensor
2. Front ABS rotor (Refer to GROUP

26 – Drive Shaft.)

A

A

"

3. Rear wheel speed sensor
4. Rear ABS rotor (Refer to GROUP

27 – Axle Shaft.)

NOTE
The front ABS rotor is integrated with the drive shaft. Do
not disassemble it.

REMOVAL SERVICE POINT

A

A

"

FRONT WHEEL SPEED SENSOR/REAR WHEEL
SPEED SENSOR REMOVAL

Caution
Do not strike the pole piece at the tip of the wheel speed
sensor against the ABS rotor tooth surface or other parts
when removing the wheel speed sensor.

Pole piece

ABS <4WD> – 

Wheel Speed Sensor

35B-30

INSPECTION

CHECK OF RESISTANCE BETWEEN WHEEL SPEED
SENSOR TERMINALS

Caution
The pole piece can become magnetized because of the
magnet built into the wheel speed sensor, with the result
that metallic foreign material easily adheres to it. Moreover,
the pole piece may not be able to function to correctly
sense the wheel rotation speed if it is damaged.

1.

Measure the resistance between the wheel speed sensor
terminals.

Standard value: 1.30 – 1.58 k

Ω

If the internal resistance of the wheel speed sensor is
not within the standard value, replace with a new wheel
speed sensor.

2.

Check the wheel speed sensor cable for breakage, damage
or disconnection; replace with a new one if a problem
is found.

NOTE
When checking for cable damage, remove the cable clamp
part from the body and then bend and pull the cable near
the clamp to check whether or not temporary disconnection
occurs.

WHEEL SPEED SENSOR INSULATION INSPECTION
1.

Remove all connections from the wheel speed sensor,
and then measure the resistance between terminals 1
and 2 and the body of the wheel speed sensor.
Standard value: 100 k

Ω

 or more

2.

If the speed sensor insulation resistance is outside the
standard value range, replace with a new speed sensor.

ABS ROTOR CHECK
Check whether ABS rotor teeth are broken or deformed, and,
if so, replace the B.J. assembly or the ABS rotor.