Mitsubishi Lancer (4A9 engine). Manual - part 83

HYDRAULIC UNIT

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-185

INSPECTION

M1355020200258

ASC OFF SWITCH CONTINUITY CHECK

ACA01062AB

1. As shown in the figure, connect the circuit tester 

to the ASC OFF switch as a single unit.

2. Check the continuity status when the ASC OFF 

switch is pressed and when the switch is 
released.

Item

When the ASC 
OFF switch is 
released (Not 
being operated)

When the ASC 
OFF switch is 
pressed

Continuity 
between 
terminal No. 1 
and No. 2

No continuity

Continuity exists 
(2 

Ω or less)

Continuity 
between 
terminal No. 3 
and No. 4

Continuity exists Continuity exists

HYDRAULIC UNIT

REMOVAL AND INSTALLATION

M1355005600884

<LHD>

NOTE: ASC-ECU is located in the hydraulic unit.

HYDRAULIC UNIT

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-186

CAUTION

When the hydraulic unit (integrated with ASC-ECU) is replaced, after turning the ignition switch ON or 
OFF (vehicle information from ETACS-ECU is registered), always carry out the calibration of all sen-
sors (steering wheel sensor, G and yaw rate sensor, and brake fluid pressure sensor) at one time.( 
Refer to 

P.35C-182

.)

Pre-removal operation
• Brake fluid draining.

Post-installation operation
• Brake fluid refilling and air bleeding (Refer to GROUP 35A 

− On-vehicle Service, Brake Fluid Level Inspection and 

Bleeding ).

• Hydraulic unit check (Refer to ).

AC611928AB

4

1

9

4

10 ± 2 N·m

24 ± 4 N·m

4

7

11

16 ± 3 N·m

4

8

13 ± 2 N·m

2

6

3

10

5

Removal steps 

<<

A

>>

1.

ASC-ECU harness connector

2.

Wheel speed sensor harness 
connector connection

3.

Wheel speed sensor harness clip 
connection

>>

A

<< 4.

Brake tube connection

5.

Brake tube clip and body 
connection

6.

Hydraulic unit (ASC-ECU) and 
hydraulic unit bracket

<<

B

>>

7.

Hydraulic unit (ASC-ECU)

8.

Hydraulic unit bracket insulator

9.

Hydraulic unit bracket B

10. Suction pipe, liquid pipe and clip 

connection

11. Hydraulic unit bracket A

<RHD>

NOTE: ASC-ECU is located in the hydraulic unit.

Removal steps (Continued)

HYDRAULIC UNIT

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-187

CAUTION

When the hydraulic unit (integrated with ASC-ECU) is replaced, after turning the ignition switch ON or 
OFF (vehicle information from ETACS-ECU is registered), always carry out the calibration of all sen-
sors (steering wheel sensor, G and yaw rate sensor, and brake fluid pressure sensor) at one time.( 
Refer to 

P.35C-182

.)

Pre-removal operation
• Brake fluid draining

• Air cleaner body assembly removal (Refer to GROUP 15 

− Air Cleaner  <4A9>,  <4J1>,  <4N1>).

Post-installation operation
• Air cleaner body assembly installation (Refer to GROUP 

15 

− Air Cleaner  <4A9>,  <4J1>,  <4N1>).

• Brake fluid refilling and air bleeding (Refer to GROUP 35A 

− On-vehicle Service, Basic Brake System Bleeding ).

• Hydraulic unit check (Refer to ).

AC707277

16 ± 3 N·m

4

AB

4

1

9

4

8

10 ± 2 N·m

5.0 ± 1.0 N·m

24 ± 4 N·m

4

7

8

13 ± 2 N·m

5

6

2

3

Removal steps 

<<

A

>>

1.

ASC-ECU harness connector

2.

Front wheel speed sensor harness 
(LH) connector

3.

Front wheel speed sensor harness 
(LH) clip

>>

A

<<

4.

Brake tube connection

5.

Protector

6.

Hydraulic unit (ASC-ECU) and 
hydraulic unit bracket

<<

B

>>

7.

Hydraulic unit (ASC-ECU)

4.

Hydraulic unit bracket insulator

6.

Hydraulic unit bracket

Removal steps (Continued)

WHEEL SPEED SENSOR

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-188

REMOVAL SERVICE POINTS

<<A>> ASC-ECU HARNESS CONNECTOR DIS-
CONNECTION

ACB01448

AB

Lock lever

Lock lever

<LHD>

<RHD>

Operate the lock lever to disconnect the ASC-ECU 
harness connector as shown in the figure.

<<B>> HYDRAULIC UNIT (ASC-ECU) REMOVAL

CAUTION

• Be careful when removing the hydraulic unit 

because it is heavy.

• Never loosen the nuts and the bolts because 

the hydraulic unit cannot be disassembled.

• Do not drop or shock the hydraulic unit.
• Do not turn the hydraulic unit upside down or 

lay down the unit because the inner air 
becomes difficult to be bled.

INSTALLATION SERVICE POINT

>>A<< BRAKE TUBE CONNECTION

AC607914AB

6

5

1

3

2

4

<LHD>

<RHD>

6

5

1

3

2

4

Install the brake pipe to the hydraulic unit as shown 
in the figure.

1. From master cylinder (primary) <Marking colour: 

Blue>

2. To front brake (RH) <Marking colour: Orange>
3. To front brake (LH) <Marking colour: Red>
4. From master cylinder (secondary) <Marking col-

our: Yellow>

5. To rear brake (LH) <Marking colour: Pink>
6. To rear brake (RH) <Marking colour: White>

W H E E L   S P E E D   S E N S O R

REMOVAL AND INSTALLATION

M1355005300151

Refer to GROUP 35B, Wheel speed sensor removal 
and installation .

INSPECTION

M1352008400761

Refer to GROUP 35B, Wheel speed sensor inspec-
tion .