Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 519

VDC-5

General Description

VEHICLE DYNAMICS CONTROL (VDC)

4. VDC CONTROL MODULE & HYDRAULIC CONTROL UNIT (VDCCM&H/U)

(1)

VDC control module and hydraulic
control unit (VDCCM&H/U)

(6)

Primary inlet

(11) Bracket

(2)

Front RH outlet

(7)

Secondary inlet

(3)

Rear LH outlet

(8)

Damper

Tightening torque: N·m (kgf-m, ft-lb)

(4)

Rear RH outlet

(9)

Spacer

T1: 7.5 (0.76, 5.5)

(5)

Front LH outlet

(10) Damper

T2: 33 (3.36, 24.3)

VDC00480

(1)

(8)

(7)

(6)

(5)

(4)

(3)

(10)

(2)

T1

T2

(11)

(9)

T2

T2

VDC-6

General Description

VEHICLE DYNAMICS CONTROL (VDC)

C: CAUTION

• Wear appropriate work clothing, including a helmet, protective goggles and protective shoes when per-

forming any work.

• Remove contamination including dirt and corrosion before removal, installation or disassembly.

• Keep the disassembled parts in order and protect them from dust and dirt.

• Before disconnecting connectors of sensors or units, be sure to disconnect the ground cable from battery.

• Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, in-

stallation, disassembly and replacement.

• Vehicle components are extremely hot after driving. Be wary of receiving burns from heated parts.

• Be sure to tighten fasteners including bolts and nuts to the specified torque.

• Place shop jacks or rigid racks at the specified points.

D: PREPARATION TOOL

1. SPECIAL TOOL

2. GENERAL TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

1B022XU0

SUBARU SELECT
MONITOR III KIT

Used for troubleshooting the electrical system.

TOOL NAME

REMARKS

Circuit tester

Used for measuring resistance and voltage.

Pressure gauge

Used for measuring oil pressure.

Oscilloscope

Used for measuring the sensor.

TORX

®

bit E5

Used for replacing VDC control module.

ST1B022XU0

VDC-7

Vehicle Dynamics Control System

VEHICLE DYNAMICS CONTROL (VDC)

2. Vehicle Dynamics Control System

A: WIRING DIAGRAM

Refer to “Vehicle Dynamics Control System” in the wiring diagram. <Ref. to WI-67, WIRING DIAGRAM, Ve-

hicle Dynamics Control System.>

B: ELECTRICAL SPECIFICATION

Refer to the Control Module I/O Signal of the “Vehicle Dynamics Control System (VDC) (DIAGNOSTICS)”.

<Ref. to VDC(diag)-14, ELECTRICAL SPECIFICATION, Control Module I/O Signal.>

C: INSPECTION

Refer to the “Vehicle Dynamics Control System (VDC) (DIAGNOSTICS)”. <Ref. to VDC(diag)-110, INSPEC-

TION, General Diagnostic Table.>

D: NOTE

For operation procedures of each component of the vehicle dynamics control system, refer to the respective

section.

• VDC control module & hydraulic control unit (VDCCM&H/U): <Ref. to VDC-8, VDC Control Module and Hy-

draulic Control Unit (VDCCM&H/U).>

• Yaw rate & G sensor: <Ref. to VDC-20, Yaw Rate and G Sensor.>

• Steering angle sensor: <Ref. to VDC-22, Steering Angle Sensor.>

• Front ABS wheel speed sensor: <Ref. to VDC-24, Front ABS Wheel Speed Sensor.>

• Rear ABS wheel speed sensor: <Ref. to VDC-26, Rear ABS Wheel Speed Sensor.>

• Front magnetic encoder: <Ref. to VDC-27, Front Magnetic Encoder.>

• Rear magnetic encoder: <Ref. to VDC-28, Rear Magnetic Encoder.>

• VDC OFF switch: <Ref. to VDC-29, VDC OFF Switch.>

VDC-8

VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

VEHICLE DYNAMICS CONTROL (VDC)

3. VDC Control Module and Hy-

draulic Control Unit (VDC-

CM&H/U)

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Use compressed air to remove moisture and

dust around the VDCCM&H/U.
NOTE:

If the terminals become dirty, it may cause improp-

er contact.

3) Lift the lock lever and Disconnect the VDC-

CM&H/U connector.
CAUTION:

Do not pull on the harness when disconnecting

the connector.

4) Disconnect the brake pipes from the VDC-

CM&H/U.

5) Wrap the brake pipe with a vinyl bag so as not to

spill the brake fluid on the vehicle body.
CAUTION:

If brake fluid is spilled on the painted surface of

the vehicle body, wash it off immediately with

water and wipe clean.

6) Remove the nuts and remove the VDCCM&H/U.
CAUTION:

• Do not drop or bump the VDCCM&H/U.

• Do not turn the VDCCM&H/U upside down or

place it sideways for storage.

• Be careful not to let foreign matter enter the

VDCCM&H/U.

• Be careful that no water enters the connec-

tors.

7) Remove the VDCCM&H/U bracket.

B: INSTALLATION

1) Install the VDCCM&H/U bracket.
Tightening torque:

33 N·m (3.36 kgf-m, 24.3 ft-lb)

2) Install the VDCCM&H/U with a new nut by align-

ing the damper groove of the VDCCM&H/U to the

bracket side claw.
Tightening torque:

7.5 N·m (0.76 kgf-m, 5.5 ft-lb)

VDC00449

VDC00450

VDC00450