Subaru Legacy IV (2008 year). Manual — part 933

VDC(diag)-47

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

WHETHER A WHEEL TURNED FREELY OR
NOT.
Check if the wheels have been turned freely for
one minute or more, such as when the vehicle is
jacked-up, under full-lock cornering or when the
wheels are not in contact with road surface.

Did the wheels turn freely?

VDC is normal.
Clear the memory.

NOTE:
This diagnostic
trouble code may
sometimes occur if
the wheels turn
freely for a long
time, for example
when the vehicle is
towed or jacked-
up, or when steer-
ing wheel is contin-
uously turned all
the way.

Go to step 2.

CHECK TIRE SPECIFICATIONS.
Turn the ignition switch to OFF.

Are the tire specifications cor-
rect?

Go to step 3.

Replace the tire.

CHECK WEAR OF TIRE.

Is the tire worn excessively?

Replace the tire.

Go to step 4.

CHECK TIRE INFLATION PRESSURE.

Is the tire pressure correct?

Go to step 5.

Adjust the tire
pressure.

CHECK INSTALLATION OF ABS WHEEL
SPEED SENSOR.

Are the ABS wheel speed sen-
sor installation bolts tightened
7.5 N·m (0.76 kgf-m, 5.5 ft-lb)?
(For four wheels)

Go to step 6.

Tighten the ABS
wheel speed sen-
sor installation
bolts.

CHECK ABS WHEEL SPEED SENSOR SIG-
NAL.
1) Install the ABS wheel speed sensor.
2) Prepare an oscilloscope.
3) Check the ABS wheel speed sensor. <Ref.
to ABS-14, ABS WHEEL SPEED SENSOR,
INSPECTION, Front ABS Wheel Speed Sen-
sor.>

Does the oscilloscope indicate
the waveform pattern like
shown in the figure when the
tire is slowly turned? Does the
oscilloscope indication repeat
the waveform pattern like
shown in the figure when the
tire is slowly turned in equal
speed for one rotation or more?

Go to step 8.

Go to step 7.

CHECK ABS WHEEL SPEED SENSOR OR
MAGNETIC ENCODER.

Are there foreign matter, break-
age or damage at the tip of ABS
wheel speed sensor or mag-
netic encoder?

Remove dirt thor-
oughly. Also
replace the ABS
wheel speed sen-
sor or magnetic
encoder as a unit
with hub unit bear-
ing if it is broken or
damaged.

Go to step 8.

CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-23,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-22, PROCEDURE, Inspection
Mode.>
4) Read the DTC.

Is the same DTC displayed?

Replace the
VDCCM only.
<Ref. to VDC-10,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>

Go to step 9.

VDC(diag)-48

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

J: DTC C0031 FR HOLD VALVE MALFUNCTION

NOTE:
For the diagnostic procedure, refer to DTC C0064 “VDC SWITCHING VALVE 2 (P)”. <Ref. to VDC(diag)-50,
DTC C0064 NORMAL CLOSING VALVE 2 MALFUNCTION, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

K: DTC C0032 FR PRESSURE REDUCING VALVE MALFUNCTION

L: DTC C0033 FL HOLD VALVE MALFUNCTION

NOTE:
For the diagnostic procedure, refer to C0064 “VDC SWITCHING VALVE 2 (P)”. <Ref. to VDC(diag)-50, DTC
C0064 NORMAL CLOSING VALVE 2 MALFUNCTION, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>

M: DTC C0034 FL PRESSURE REDUCING VALVE MALFUNCTION

N: DTC C0035 RR HOLD VALVE MALFUNCTION

O: DTC C0036 RR PRESSURE REDUCING VALVE MALFUNCTION

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-34, List
of Diagnostic Trou-
ble Code (DTC).>

It results from a
temporary noise
interference.

NOTE:
Though the ABS
warning light re-
mains on at this
time, this is normal.
Drive the vehicle at
12 km/h (7 MPH)
or more in order to
turn ABS warning
light off. Be sure to
drive the vehicle
and check that the
warning light goes
off.

Step

Check

Yes

VDC(diag)-49

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

P: DTC C0037 RL HOLD VALVE MALFUNCTION

Q: DTC C0038 RL PRESSURE REDUCING VALVE MALFUNCTION

R: DTC C0039 ANY ONE OF FOUR SOLENOID VALVES

S: DTC C0061 NORMAL OPENING VALVE 1 MALFUNCTION

T: DTC C0062 NORMAL OPENING VALVE 2 MALFUNCTION

U: DTC C0063 NORMAL CLOSING VALVE 1 MALFUNCTION

VDC(diag)-50

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

V: DTC C0064 NORMAL CLOSING VALVE 2 MALFUNCTION

DTC DETECTING CONDITION:
• Defective harness connector
• Defective VDCH/U solenoid valve
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD does not operate.
• VDC does not operate.
WIRING DIAGRAM:

MAIN SBF

SBF-6

No.33

B310

VDCCM & H/U

BATTERY

GENERATOR

IGNITION
SWITCH

B310

4 5 6 7 8 9

26 27 28 29 30

2 3

31 32 33 34 35 36

10 11

14 15 16 17 18 19

37 38 39 40

12 13

41 42 43 44 45 46

20 21

VDC00463

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Subaru Legacy IV (2008 year). Manual — part 933

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