Subaru 2009 IMPREZA, Service Manual

Page: 2447 / 3619

VDC-8
VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)
VEHICLE DYNAMICS CONTROL (VDC)
6) Check the parameter to confirm that the applied
models and grades of the relevant vehicle are in-
cluded. <Ref. to VDC(diag)-18, PARAMETER
CHECK, OPERATION, Subaru Select Monitor.>
7) If the applied model and grade of the target ve-
hicle are not included on the {Confirm on parame-
ter} display screen, perform parameter selection
and registration. <Ref. to VDC(diag)-18, PARAME-
TER SELECTION, OPERATION, Subaru Select
Monitor.>
NOTE:
• When the VDCCM&H/U is replaced with a new
part, be sure to perform the selection•registration
operation.
• For the selection and registration of parameter,
the Subaru Select Monitor is required.
• When the registration has not been performed,
the DTC code “Parameter selection error” is detect-
ed together with the ABS/EBD/VDC warning light il-
lumination.
C: INSPECTION
1) Check the condition of connection and settle-
ment of connector.
2) Check the mark used for VDCCM&H/U identifi-
cation.
Refer to “SPECIFICATION” for the identification
mark. <Ref. to VDC-2, SPECIFICATION, General
Description.>
1. CHECKING THE HYDRAULIC UNIT ABS
OPERATION BY PRESSURE GAUGE
<Ref. to ABS-7, CHECKING THE HYDRAULIC
UNIT ABS OPERATION BY PRESSURE GAUGE,
INSPECTION, ABS Control Module and Hydraulic
Control Unit (ABSCM&H/U).>
2. CHECKING THE HYDRAULIC UNIT ABS
OPERATION WITH THE BRAKE TESTER
<Ref. to ABS-8, CHECKING THE HYDRAULIC
UNIT ABS OPERATION WITH THE BRAKE
TESTER, INSPECTION, ABS Control Module and
Hydraulic Control Unit (ABSCM&H/U).>
3. CHECKING THE HYDRAULIC UNIT VDC
OPERATION USING A PRESSURE GAUGE
1) Lift up the vehicle, and remove the wheels.
2) Remove the air bleeder screws from FL and FR
caliper bodies.
3) Connect two pressure gauges to FL and FR cal-
iper bodies.
CAUTION:
• Use a pressure gauge used exclusively for
brake fluid measurement.
• Do not use a pressure gauge used for the
measuring transmission oil pressure, as the
piston seal may expand and deform.
NOTE:
Wrap sealing tape around the pressure gauge.
4) Bleed air from the pressure gauge.
5) Perform VDC sequence control.
<Ref. to VDC-13, VDC Sequence Control.>
6) When the hydraulic unit begins to work, first the
FL side performs compression, hold, and decom-
pression, and then the FR side performs compres-
sion, hold, and decompression.
7) Read values indicated on the pressure gauge
and check if the fluctuation of the values between
decompression and compression meets specifica-
tion. Depress the brake pedal and check that it is
not abnormally hard, and tightness is normal.
8) Disconnect the pressure gauges from FL and FR
caliper bodies.
9) Install the air bleeder screws of FL and FR cali-
per bodies.
10) Remove the air bleeder screws from RL and
RR caliper bodies.
11) Connect two pressure gauges to RL and RR
caliper bodies.
(1) Identification mark
VDC00452
(1)
Front wheel Rear wheel
When
pressurized
3,000 kPa
(31 kgf/cm
2
, 441 psi)
or more
3,000 kPa
(31 kgf/cm
2
, 441 psi)
or more
When
depressurized
500 kPa
(5 kgf/cm
2
, 73 psi)
or less
500 kPa
(5 kgf/cm
2
, 73 psi)
or less
ABS00134