Subaru LEGACY 2006 Manual page 4217

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK THE VDCCM&H/U INPUT VOLTAGE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Run the engine at idle.
4) Measure the voltage between VDCCM&H/
U connector and chassis ground.
Connector & terminal
(B310) No. 5 (+) — Chassis ground (–):
2 CHECK THE VDCCM&H/U GROUND CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between
VDCCM&H/U connector and chassis ground.
Connector & terminal
(B310) No. 6 — Chassis ground:
3 CHECK THE VDCCM&H/U VALVE RELAY.
Measure the resistance between VDCCM&H/U
connector terminals.
Connector & terminal
(B310) No. 5 — (B310) No. 6:
4 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
5 CHECK THE VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
6 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is the voltage 10 — 15 V?
Is the resistance less than 0.5
Ω?
Is the resistance more than 1
MΩ?
nector between generator, bat-
tery and VDCCM&H/U?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-71
Yes No
Go to step 2. Repair the
VDCCM&H/U
power circuit.
Go to step 3. Repair the
VDCCM&H/U
ground circuit.
Go to step 4. Replace the
VDCCM&H/U.
Go to step 5.
Repair the con-
nector.
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- Temporary poor
nosis according to contact occurs.
DTC.