Subaru LEGACY 2006 Manual page 4193

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
5 CHECK THE VDCCM&H/U POWER SUPPLY
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the VDCCM&H/U connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between VDCCM&H/
U connector terminals.
Connector & terminal
(B310) No. 14 (+) — (B310) No. 6 (–):
6 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-15, ABS WHEEL SPEED SENSOR,
INSPECTION, Rear ABS Wheel Speed Sen-
sor.>
7 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.
8 CHECK OTHER DTC DETECTION.
I: DTC C0022 FRONT ABS WHEEL SPEED SENSOR RH SIGNAL MALFUNC-
TION
NOTE:
For the diagnostic procedure, refer to DTC C0028 "REAR ABS WHEEL SPEED SENSOR LH SIGNAL MAL-
FUNCTION". <Ref. to VDC(diag)-48, DTC C0028 REAR ABS WHEEL SPEED SENSOR LH SIGNAL MAL-
FUNCTION, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
J: DTC C0024 FRONT ABS WHEEL SPEED SENSOR LH SIGNAL MALFUNC-
TION
NOTE:
For the diagnostic procedure, refer to DTC C0028 "REAR ABS WHEEL SPEED SENSOR LH SIGNAL MAL-
FUNCTION". <Ref. to VDC(diag)-48, DTC C0028 REAR ABS WHEEL SPEED SENSOR LH SIGNAL MAL-
FUNCTION, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
K: DTC C0026 REAR ABS WHEEL SPEED SENSOR RH SIGNAL MALFUNC-
TION
NOTE:
For the diagnostic procedure, refer to DTC C0028 "REAR ABS WHEEL SPEED SENSOR LH SIGNAL MAL-
FUNCTION". <Ref. to VDC(diag)-48, DTC C0028 REAR ABS WHEEL SPEED SENSOR LH SIGNAL MAL-
FUNCTION, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is the voltage 10 — 15 V?
Is the pattern the same wave-
form as shown in the figure?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-47
Yes No
Go to step 7. Check the genera-
tor, battery and
VDCCM&H/U
power supply cir-
cuit.
Go to step 7. Replace the ABS
wheel speed sen-
sor.
Go to step 8.
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.