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Subaru Legacy (2005 year). Manual - part 798

VDC(diag)-57

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

• RHD model

VDC00326

B97

R72

R73

B15

R73

R72

B310

B97

VDCCM & H/U

TWISTED WIRE

FRONT ABS

WHEEL SPEED

SENSOR LH

1 2 3 4

11 12 13 14
27 28 29 30

15 16 17 18
31 32 33 34

19 20 21 22
35 36 37 38

23 24 25 26
39 40 41 42

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

TWISTED WIRE

FRONT ABS

WHEEL SPEED

SENSOR RH

REAR ABS

WHEEL SPEED

SENSOR LH

REAR ABS

WHEEL SPEED

SENSOR RH

1 2

VDC(diag)-58

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

WHETHER A WHEEL TURNED FREELY OR
NOT.
Check if the wheels have been turned freely for
more than one minute, such as when the vehi-
cle 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.
Perform the clear
memory mode.

NOTE:
When the wheels
turn freely for a
long time, such as
when the vehicle is
towed or jacked-
up, or when steer-
ing wheel is contin-
uously turned all
the way, this diag-
nostic trouble code
may sometimes
occur.

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
to 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-13, 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 more one rotation?

Go to step 8.

Go to step 7.

CHECK ABS WHEEL SPEED SENSOR OR
MAGNETIC ENCODER.

Are there foreign materials,
breakage or damage in the
protrusion of ABS wheel speed
sensor or magnetic encoder?

Remove dirt
throughly. 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 the connectors.
2) Perform the clear memory mode.
3) Perform the inspection mode. <Ref. to
VDC(diag)-24, PROCEDURE, Inspection
Mode.>
4) Read the DTC.

Is the same DTC displayed?

Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>

Go to step 9.

VDC(diag)-59

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

N: DTC C0031 FRONT INLET SOLENOID VALVE RH MALFUNCTION IN VDC-

CM&H/U

NOTE:
For the diagnostic procedure, refer to DTC C0064 “PRIMARY SUCTION VALVE MALFUNCTION IN VDC-
CM&H/U”. <Ref. to VDC(diag)-60, DTC C0064 PRIMARY SUCTION VALVE MALFUNCTION IN VDC-
CM&H/U, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

O: DTC C0032 FRONT OUTLET SOLENOID VALVE RH MALFUNCTION IN VDC-

CM&H/U

P: DTC C0033 FRONT INLET SOLENOID VALVE LH MALFUNCTION IN VDC-

CM&H/U

Q: DTC C0034 FRONT OUTLET SOLENOID VALVE LH MALFUNCTION IN VDC-

CM&H/U

R: DTC C0035 REAR INLET SOLENOID VALVE RH MALFUNCTION IN VDC-

CM&H/U

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to
DTC.

It results from a
temporary noise
interference.

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

Step

Check

Yes

VDC(diag)-60

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

S: DTC C0036 REAR OUTLET SOLENOID VALVE RH MALFUNCTION IN VDC-

CM&H/U

T: DTC C0037 REAR INLET SOLENOID VALVE LH MALFUNCTION IN VDC-

CM&H/U

U: DTC C0038 REAR OUTLET SOLENOID VALVE LH MALFUNCTION IN VDC-

CM&H/U

V: DTC C0061 SECONDARY CUT VALVE MALFUNCTION IN VDCCM&H/U

W: DTC C0062 PRIMARY CUT VALVE MALFUNCTION IN VDCCM&H/U

X: DTC C0063 SECONDARY SUCTION VALVE MALFUNCTION IN VDCCM&H/U

Y: DTC C0064 PRIMARY SUCTION VALVE MALFUNCTION IN VDCCM&H/U

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.

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