VDC(diag)-55
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK OUTPUT OF ABS WHEEL SPEED
SENSOR USING SUBARU SELECT MONI-
TOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Read the ABS wheel speed sensor output
corresponding to the faulty wheel in Subaru
Select Monitor data display mode.
Does the speed indicated on
the display change in response
to the speedometer reading
during acceleration/decelera-
tion when the steering wheel is
in the straight-ahead position?
Go to step 2.
Go to step 7.
2
CHECK POOR CONTACT IN CONNECTOR.
Turn the ignition switch to OFF.
Is there poor contact in con-
nectors between VDCCM&H/U
and ABS wheel speed sensor?
Repair the con-
nector.
Go to step 3.
3
CHECK SOURCES OF SIGNAL NOISE.
Make sure the car phone, radio wave device
like radio and etc., or electric device are
installed correctly.
Are the car phone, radio wave
device like radio and etc., or
electric device installed cor-
rectly?
Go to step 4.
Install the radio
wave device and
electric device
properly.
4
CHECK SOURCES OF SIGNAL NOISE.
Check if the noise sources (such as an
antenna) are installed near the sensor har-
ness.
Are noise sources installed?
Install the noise
sources apart from
the sensor har-
ness.
Go to step 5.
5
CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode. <Ref. to
VDC(diag)-23, 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 & Hydraulic
Control Unit
(VDCCM&H/U).>
Go to step 6.
6
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
It results from a
temporary noise
interference.
7
CHECK INSTALLATION OF ABS WHEEL
SPEED SENSOR.
Is the ABS wheel speed sen-
sor installation bolt tightened
7.5 N
⋅
m (0.76 kgf-m, 5.5 ft-lb)?
Go to step 8.
Tighten the ABS
wheel speed sen-
sor installation
bolts.
8
CHECK ABS WHEEL SPEED SENSOR SIG-
NAL.
1) Install the ABS wheel speed sensor.
2) Prepare an oscilloscope.
3) Check ABS wheel speed sensor. <Ref. to
ABS-13, ABS WHEEL SPEED SENSOR,
INSPECTION, Front ABS Wheel Speed Sen-
sor.>
Is the oscilloscope pattern the
same waveform as shown in
the figure when the tire is
rotated? Is the pattern as
shown in the figure displayed
regularly in the oscilloscope
when the tire is slowly rotated
more than one revolution with
even speed?
Go to step 9.
Go to step 13.
9
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 thor-
oughly. Replace
the ABS wheel
speed sensor or
magnetic encoder
as a unit with hub
unit bearing when
it is broken or
damaged.
Go to step 10.
10
CHECK SOURCES OF SIGNAL NOISE.
Make sure the car phone, radio wave device
like radio and etc., or electric device are
installed correctly.
Is the car phone, radio wave
device like radio and etc., or
electric device installed cor-
rectly?
Go to step 11.
Install the radio
wave device and
electric device
properly.
11
CHECK SOURCES OF SIGNAL NOISE.
Check if the noise sources are (such as an
antenna) installed near the sensor harness.
Are noise sources installed?
Go to step 12.
Install the noise
sources apart from
the sensor har-
ness.
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