Subaru LEGACY 2006 Manual page 4195

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
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.
2 CHECK POOR CONTACT IN CONNECTOR.
Turn the ignition switch to OFF.
3 CHECK CAUSE OF SIGNAL NOISE.
Make sure the radio wave devices and electric
components are installed correctly.
4 CHECK CAUSE OF SIGNAL NOISE.
Check if the noise sources (such as an
antenna) are installed near the sensor har-
ness.
5 CHECK THE VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-25, PROCEDURE, Inspection
Mode.>
4) Read the DTC.
6 CHECK OTHER DTC DETECTION.
7 CHECK INSTALLATION OF ABS WHEEL
SPEED SENSOR.
8 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.>
9 CHECK ABS WHEEL SPEED SENSOR OR
MAGNETIC ENCODER.
10 CHECK CAUSE OF SIGNAL NOISE.
Make sure the radio wave devices and electric
components are installed correctly.
11 CHECK CAUSE OF SIGNAL NOISE.
Check if the noise sources (such as an
antenna) are installed near the sensor har-
ness.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
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?
Is there poor contact in con-
nectors between VDCCM&H/U
and ABS wheel speed sensor?
Are the radio wave devices and
electric components installed
correctly?
Are noise sources installed?
Is the same DTC displayed?
Is any other DTC displayed?
Is the ABS wheel speed sen-
sor installation bolt tightened
7.5 N·m (0.76 kgf-m, 5.5 ft-lb)?
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?
Are there foreign matter,
breakage or damage at the tip
of ABS wheel speed sensor or
magnetic encoder?
Are the radio wave devices and
electric components installed
correctly?
Is the noise sources installed? Go to step 12.
VDC(diag)-49
Yes No
Go to step 2. Go to step 7.
Go to step 3.
Repair the con-
nector.
Go to step 4. Install the radio
wave devices and
electric compo-
nents properly.
Go to step 5.
Install the noise
sources apart from
sensor harness.
Go to step 6.
Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- It results from a
nosis according to temporary noise
DTC. interference.
Go to step 8.
Tighten the ABS
wheel speed sen-
sor installation
bolts.
Go to step 10. Go to step 9.
Remove dirt thor- Go to step 10.
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 11. Install the radio
wave devices and
electric compo-
nents properly.
Install the noise
sources apart from
sensor harness.