Subaru Legacy IV (2008 year). Manual - part 918

VDC-10

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

VEHICLE DYNAMICS CONTROL (VDC)

D: REPLACEMENT

CAUTION:
• Because the pressure sensor built into the H/
U is easily damaged by static electricity, start
the operation after performing static electricity
measures.
• Be careful not to touch the sensors in the H/U
to prevent damage.
• Because the seal of the VDCCM cannot be re-
placed, do not pull or peel it by lifting it up.
• Because the screw of the H/U will become
slightly worn in every replacement procedure, 5
times is the maximum number of times for re-
placement. If a problem is found such as not
being able to torque the screw to specifications
even before 5 replacement operations are per-
formed, replace the H/U body.
• When installing the VDCCM, always use new
screws.
• When the sealing surface of the VDCCM or H/
U is dirty or damaged and it cannot be cleaned
or repaired, replace with a new part.
1) Remove the VDCCM&H/U. <Ref. to VDC-7, RE-
MOVAL, VDC Control Module and Hydraulic Con-
trol Unit (VDCCM&H/U).>
2) To prevent entry of foreign objects and brake flu-
id leakage, plug the oil pressure port of the VDC-
CM&H/U using a screw plug, etc.
3) Set the pump motor section of the removed VD-
CCM&H/U face down on a vise.

NOTE:
Before securing a part in a vise, place cushioning
material such as wood blocks, aluminum plate or
cloth between the part and the vise.

4) Using TORX

®

 bit E5, remove the four screws of

VDCCM.

NOTE:
These screws cannot be reused.

5) Slowly pull out the VDCCM upward from the H/U.

NOTE:
To prevent damaging of coil section, remove the
VDCCM straight up from H/U without twisting.
6) Make sure there is no dirt or damage on the seal-
ing surface of the H/U.

CAUTION:
• Do not clean the VDCCM&H/U by applying
compressed air.
• Even if damage is found on the H/U seal, do
not attempt repair by filing or with a metal
scraper. To remove the seal residue, always
use a plastic scraper. Do not use chemical such
as paint thinner, etc., to clean.
7) Position the coil of the new VDCCM to align with
the H/U valve.
8) To prevent deformation of the VDCCM housing
cover, hold the corner of VDCCM and install it to
the H/U without tilting.
9) Using a TORX

®

 bit E5, attach/tighten new

screws in the order of (1) through (4).

CAUTION:
Always use new screws.

Tightening torque:

1.5 N·m (0.15 kgf-m, 1.1 ft-lb)

10) Check that there is no foreign matter in mating
surface between the VDCCM&H/U.

(1) Aluminum plate, etc.

(2) Vise

ABS00430

(1)

(2)

ABS00431

ABS00432

(4)

(2)

(1)

(3)

VDC-11

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

VEHICLE DYNAMICS CONTROL (VDC)

11) Using a TORX

®

 bit E5, tighten the screws in the

order of (1) through (4) again.

Tightening torque:

3 N·m (0.3 kgf-m, 2.2 ft-lb)

12) Check that there is no gap in the mating sur-
face between VDCCM&H/U.
13) Install the VDCCM&H/U to the vehicle.
14) Bleed air from the brake system.
15) Perform the selection and registration opera-
tion of parameter. <Ref. to VDC(diag)-16, PARAM-
ETER SELECTION, OPERATION, Subaru Select
Monitor.>

NOTE:
• After replacing the VDCCM, be sure to perform
the selection and registration operation of parame-
ter.
• For the selection and registration of parameter,
the Subaru Select Monitor is required.
• When no data is registered, ABS/EBD/VDC
warning light illuminates and the DTC “Parameter
selection error” is detected.
16) Check the parameter to confirm that the ap-
plied models and grades of the relevant vehicle are
included. <Ref. to VDC(diag)-17, PARAMETER
CHECK, OPERATION, Subaru Select Monitor.>
17) If the applied models and grades of the relevant
vehicle are not included, perform the selection and
registration operation of parameter with the {Con-
firm Parameter} screen again. <Ref. to VDC(diag)-
16, PARAMETER SELECTION, OPERATION,
Subaru Select Monitor.>
18) Execute Clear Memory after parameter selec-
tion and registration operations because the DTC
for “Parameter selection error” is memorized.

E: ADJUSTMENT

When the following replacement, removal and in-
stallation are performed, be sure to perform the
centering of the steering angle sensor and zero
point setting of yaw rate & lateral G sensor.
• VDCCM&H/U
• Steering angle sensor
• Yaw rate & lateral G sensor
• Steering wheel parts (Including airbag)
• Suspension parts
• Wheel alignment adjustment
1) Park the vehicle straight on a level surface. (En-
gine operation in the “P” or “N” range)
2) Check that steering wheel is positioned at the
center. (When the center position is not correct, ad-
just the wheel alignment.)
3) Set the Subaru Select Monitor to the vehicle,
and select the {Set up mode for Neutral of Steering
Angle Sensor & Lateral G Sensor 0 point} in the
«Function Check Sequence» screen. (Follow the
steps on the display.)
4) On the «Brake Control System» display, select
the {Current Data Display & Save}, and check that
the steering angle sensor shows “0 deg”.
5) When the “0 deg” is not displayed, repeat the
above steps and check that the “0 deg” is dis-
played.
6) Drive the vehicle for 10 minutes, and check that
the ABS and VDC warning light is not illuminated.
7) Check that there is no unnecessary VDC opera-
tion or steering control loss. If there is a malfunc-
tion, repeat the steps above.

VDC-12

ABS Sequence Control

VEHICLE DYNAMICS CONTROL (VDC)

3. ABS Sequence Control

A: OPERATION

<Ref. to ABS-10, OPERATION, ABS Sequence
Control.>

1. ABS SEQUENCE CONTROL WITH 
SUBARU SELECT MONITOR

<Ref. to ABS-10, ABS SEQUENCE CONTROL
WITH SUBARU SELECT MONITOR, OPERA-
TION, ABS Sequence Control.>

2. CONDITIONS FOR ABS SEQUENCE 
CONTROL

<Ref. to ABS-11, CONDITIONS FOR ABS SE-
QUENCE CONTROL, OPERATION, ABS Se-
quence Control.>

B: SPECIFICATION

1. CONDITIONS FOR COMPLETION OF 
ABS SEQUENCE CONTROL

<Ref. to ABS-12, CONDITIONS FOR COMPLE-
TION OF ABS SEQUENCE CONTROL, SPECIFI-
CATION, ABS Sequence Control.>

VDC-13

VDC Sequence Control

VEHICLE DYNAMICS CONTROL (VDC)

4. VDC Sequence Control

A: OPERATION

1) While the VDC sequence control is performed,
the operation of the hydraulic unit can be checked
using the brake tester or pressure gauge after the
hydraulic unit solenoid valve is operated.
2) VDC sequence control can be started by Subaru
Select Monitor.

1. VDC SEQUENCE CONTROL WITH 
SUBARU SELECT MONITOR

NOTE:
In the event of any trouble, sequence control will
not operate.
1) Connect the Subaru Select Monitor to data link
connector under the driver’s side instrument panel
lower cover.
2) Turn the ignition switch to ON.
3) Run the “PC application for Subaru Select Mon-
itor”.
4) Set the Subaru Select Monitor to “Brake Control”
mode.
5) When the “VDC Inspection Mode” is selected
from the “Function Check Sequence” menu, the
“VDC sequence control” will start.
6) Press “OK” will be displayed. Press the “OK”
key.
7) Operation points will be displayed on Subaru Se-
lect Monitor.