Subaru Legacy III (2000-2003 year). Service manual — part 779

VDC-152

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

4

CHECK BATTERY SHORT OF SOLENOID
VALVE.
1) Turn ignition switch to ON.
2) Measure voltage between VDCH/U con-

nector and chassis ground.

Connector & terminal

DTC 31/(VDC5) No. 5 (+) — Chassis
ground (

−−−−

):

DTC 33/(VDC5) No. 8 (+) — Chassis
ground (

−−−−

):

DTC 35/(VDC5) No. 7 (+) — Chassis
ground (

−−−−

):

DTC 37/(VDC5) No. 6 (+) — Chassis
ground (

−−−−

):

DTC 61/(VDC5) No. 9 (+) — Chassis
ground (

−−−−

):

DTC 62/(VDC5) No. 12 (+) — Chassis
ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Go to step 5.

Replace VDCH/U.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>

5

CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Measure voltage between VDCCM connec-

tor and chassis ground.

Connector & terminal

DTC 31/(F87) No. 30 (+) — Chassis
ground (

−−−−

):

DTC 33/(F87) No. 24 (+) — Chassis
ground (

−−−−

):

DTC 35/(F87) No. 23 (+) — Chassis
ground (

−−−−

):

DTC 37/(F87) No. 31 (+) — Chassis
ground (

−−−−

):

DTC 61/(F87) No. 25 (+) — Chassis
ground (

−−−−

):

DTC 62/(F87) No. 26 (+) — Chassis
ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Go to step 6.

Repair harness
between VDCCM
and VDCH/U.

6

CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-

tor and chassis ground.

Connector & terminal

DTC 31/(F87) No. 30 (+) — Chassis
ground (

−−−−

):

DTC 33/(F87) No. 24 (+) — Chassis
ground (

−−−−

):

DTC 35/(F87) No. 23 (+) — Chassis
ground (

−−−−

):

DTC 37/(F87) No. 31 (+) — Chassis
ground (

−−−−

):

DTC 61/(F87) No. 25 (+) — Chassis
ground (

−−−−

):

DTC 62/(F87) No. 26 (+) — Chassis
ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Go to step 7.

Repair harness
between VDCCM
and VDCH/U.

Step

Value

Yes

No

VDC-153

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

7

CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Measure resistance between VDCCM con-

nector and chassis ground.

Connector & terminal

DTC 31/(F87) No. 30 — Chassis ground:
DTC 33/(F87) No. 24 — Chassis ground:
DTC 35/(F87) No. 23 — Chassis ground:
DTC 37/(F87) No. 31 — Chassis ground:
DTC 61/(F87) No. 25 — Chassis ground:
DTC 62/(F87) No. 26 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 8.

Repair harness
between VDCCM
and VDCH/U.

8

CHECK HARNESS/CONNECTOR BETWEEN
VDCCM AND VDCH/U.
1) Connect connector (F91) to VDCH/U.
2) Measure resistance between VDCCM con-

nector and VDCH/U connector.

Connector & terminal

DTC 31/(F87) No. 30 — (VDC2) No. 2:
DTC 33/(F87) No. 24 — (VDC2) No. 2:
DTC 35/(F87) No. 23 — (VDC2) No. 2:
DTC 37/(F87) No. 31 — (VDC2) No. 2:
DTC 61/(F87) No. 25 — (VDC2) No. 2:
DTC 62/(F87) No. 26 — (VDC2) No. 2:

Is the measured value within the specified
range?

7 — 10

Ω

Go to step 9.

Repair harness/
connector
between VDCCM
and VDCH/U.

9

CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
VDCCM and VDCH/U?

There is poor contact.

Repair connector.

Go to step 10.

10

CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the diagnostic trouble code.

Is the same diagnostic trouble code as in
the current diagnosis still being output?

Same DTC indicated.

Repair VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>

Go to step 11.

11

CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Are other diagnostic trouble codes being out-
put?

Other DTC indicated.

Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.

A temporary poor
contact.

Step

Value

Yes

No

VDC-154

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

Q: DTC 32 FR PRESSURE REDUCING VALVE MALFUNCTION (FRONT RIGHT

OUTLET VALVE MALFUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-156, DTC 64 NORMAL CLOSING VALVE 1 MAL-
FUNCTION (SECONDARY SUCTION VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>

R: DTC 34 FL PRESSURE REDUCING VALVE MALFUNCTION (FRONT LEFT

OUTLET VALVE MALFUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-156, DTC 64 NORMAL CLOSING VALVE 1 MAL-
FUNCTION (SECONDARY SUCTION VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>

S: DTC 36 RR PRESSURE REDUCING VALVE MALFUNCTION (REAR RIGHT

OUTLET VALVE MALFUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-156, DTC 64 NORMAL CLOSING VALVE 1 MAL-
FUNCTION (SECONDARY SUCTION VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>

T: DTC 38 RL PRESSURE REDUCING VALVE MALFUNCTION (REAR LEFT

OUTLET VALVE MALFUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-156, DTC 64 NORMAL CLOSING VALVE 1 MAL-
FUNCTION (SECONDARY SUCTION VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>

U: DTC 63 NORMAL CLOSING VALVE 2 MALFUNCTION (PRIMARY SUCTION

VALVE MALFUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-156, DTC 64 NORMAL CLOSING VALVE 1 MAL-
FUNCTION (SECONDARY SUCTION VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>

VDC-155

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

MEMO: