Subaru LEGACY 2006 Manual page 4254

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
1 CHECK PRESSURE SENSOR POWER SUP-
PLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the pres-
sure sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between pressure
sensor connector and chassis ground.
Connector & terminal
(B348) No. 1 (+) — Chassis ground (–):
2 CHECK OUTPUT VOLTAGE OF VDCCM&H/
U.
Measure the voltage between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 27 (+) — Chassis ground (–):
3 CHECK POOR CONTACT OF CONNECTOR. Is there poor contact in con-
4 CHECK GROUND CIRCUIT OF PRESSURE
SENSOR.
Measure the resistance between pressure
sensor and chassis ground.
Connector & terminal
(B348) No. 3 — Chassis ground:
5 CHECK THE VDCCM&H/U GROUND CIR-
CUIT.
Measure the resistance between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 12 — Chassis ground:
6 CHECK POOR CONTACT OF CONNECTOR. Is there poor contact in con-
7 CHECK PRESSURE SENSOR HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Measure the resistance between
VDCCM&H/U and pressure sensor.
Connector & terminal
(B310) No. 11 — (B348) No. 2:
8 CHECK GROUND SHORT OF HARNESS.
Measure the resistance between VDCCM&H/U
connector and chassis ground.
Connector & terminal
(B310) No. 11 — Chassis ground:
9 CHECK THE VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
10 CHECK OTHER DTC DETECTION.
Check
Is the voltage 4.75 — 5.25 V? Go to step 4.
Is the voltage 4.75 — 5.25 V? Repair the har-
nector?
Is the resistance less than 0.5
Ω?
Is the resistance less than 0.5
Ω?
nector?
Is the resistance less than 0.5
Ω?
Is the resistance more than 1
MΩ?
Is DTC displayed?
Is any other DTC displayed?
VDC(diag)-108
Yes No
Go to step 2.
Go to step 3.
ness between the
pressure sensor
and VDCCM&H/U.
Correct or replace Go to step 9.
the connector.
Go to step 7. Go to step 5.
Go to step 6.
Repair the har-
ness between the
pressure sensor
and VDCCM&H/U.
Go to step 9.
Correct or replace
the connector.
Go to step 8. Repair the har-
ness between the
pressure sensor
and VDCCM&H/U.
Go to step 9.
Repair the har-
ness between the
pressure sensor
and VDCCM&H/U.
Replace the Go to step 10.
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.