Subaru Legacy IV (2008 year). Manual - part 926

 

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Subaru Legacy IV (2008 year). Manual - part 926

 

 

VDC(diag)-19

Subaru Select Monitor

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK IGNITION SWITCH.

Is the ignition switch ON?

Go to step 2.

Turn the ignition 
switch to ON, and 
select VDC mode 
using Subaru 
Select Monitor.

2

CHECK BATTERY.
1) Turn the ignition switch to OFF.
2) Measure the battery voltage.

Is the voltage 11 V or more?

Go to step 3.

Charge or replace 
the battery.

3

CHECK BATTERY TERMINAL.

Is there poor contact at the bat-
tery terminal?

Repair or tighten 
the battery termi-
nal.

Go to step 4.

4

CHECK SUBARU SELECT MONITOR COM-
MUNICATION.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, check 
whether communication to other systems can 
be executed normally.

Is the system name displayed 
on Subaru Select Monitor?

Go to step 8.

Go to step 5.

5

CHECK SUBARU SELECT MONITOR COM-
MUNICATION.
1) Turn the ignition switch to OFF.
2) Disconnect the VDCCM&H/U connector.
3) Turn the ignition switch to ON.
4) Check whether communication to other sys-
tems can be executed normally.

Is the system name displayed 
on Subaru Select Monitor?

Replace the 
VDCCM only. 
<Ref. to VDC-10, 
REPLACEMENT, 
VDC Control Mod-
ule and Hydraulic 
Control Unit 
(VDCCM&H/U).>

Go to step 6.

6

CHECK HARNESS CONNECTOR BETWEEN 
EACH CONTROL MODULE AND DATA LINK 
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the VDCCM&H/U, ECM and 
TCM.
3) Measure the resistance between data link 
connector and chassis ground.

Connector & terminal

(B40) No. 7 — Chassis ground:

Is the resistance 1 M

: or 

more?

Go to step 7.

Repair the harness 
and connector 
between each con-
trol module and 
data link connec-
tor.

7

CHECK OUTPUT SIGNAL FOR VDCCM&H/U.
1) Turn the ignition switch to ON.
2) Measure the voltage between data link con-
nector and chassis ground.

Connector & terminal

(B40) No. 7 (+) — Chassis ground (–):

Is the voltage less than 1 V?

Go to step 8.

Repair the harness 
and connector 
between each con-
trol module and 
data link connec-
tor.

8

CHECK HARNESS CONNECTOR BETWEEN 
VDCCM&H/U AND DATA LINK CONNEC-
TOR.
Measure the resistance between VDCCM&H/U 
connector and data link connector.

Connector & terminal

(B310) No. 7 — (B40) No. 7:

Is the resistance less than 0.5 

:? Go to step 9.

Repair harness 
and connector 
between 
VDCCM&H/U and 
data link connec-
tor.

9

CHECK INSTALLATION OF VDCCM&H/U 
CONNECTOR.
Turn the ignition switch to OFF.

Is the VDCCM&H/U connector 
inserted into VDCCM&H/U until 
the clamp locks onto it?

Go to step 10.

Insert VDCCM&H/
U connector into 
VDCCM&H/U.

10

CHECK POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to ON. (engine OFF)
2) Measure the ignition power supply voltage 
between VDCCM&H/U connector and chassis 
ground.

Connector & terminal

(B310) No. 28 (+) — Chassis ground (–):

Is the voltage 10 — 15 V?

Go to step 11.

Repair open circuit 
in harness 
between 
VDCCM&H/U and 
battery.

VDC(diag)-20

Subaru Select Monitor

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

11

CHECK HARNESS CONNECTOR BETWEEN 
VDCCM&H/U AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the 
VDCCM&H/U.
3) Measure the resistance of harness between 
VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 25 — Chassis ground:

Is the resistance less than 0.5 

:? Go to step 12.

Repair the open 
circuit of 
VDCCM&H/U 
ground harness 
and poor contact of 
connector.

12

CHECK POOR CONTACT IN CONNECTOR.

Is there poor contact in control 
module power supply, ground 
circuit and data link connector?

Repair the connec-
tor.

Replace the 
VDCCM only. 
<Ref. to VDC-10, 
REPLACEMENT, 
VDC Control Mod-
ule and Hydraulic 
Control Unit 
(VDCCM&H/U).>

Step

Check

Yes

No

VDC(diag)-21

Read Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

7. Read Diagnostic Trouble 

Code (DTC)

A: OPERATION

1) On the «Main Menu» display, select the {Each
System Check}.
2) On the «System Selection Menu» display, select
the {Brake Control System}.
3) Click the [OK] button after the {VDC} is dis-
played.
4) On the «Brake Control Diagnosis» display, se-
lect the {Diagnostic Code(s) Display}.
5) Record the DTC and data.

NOTE:
• For detailed operation procedure, refer to the
“PC application help for Subaru Select Monitor”.
• For details concerning DTCs, refer to “List of Di-
agnostic Trouble Code (DTC)”. <Ref. to VDC(di-
ag)-34, List of Diagnostic Trouble Code (DTC).>
• Up to 3 DTCs are displayed in the order of detec-
tion.
• If a particular DTC is not stored in memory prop-
erly at the occurrence of problem (due to a drop in
VDCCM&H/U power supply etc.), the DTC suffixed
with a question mark “?” is displayed on Subaru Se-
lect Monitor display screen. This shows it may be
an unreliable reading.

Display

Contents to be displayed

(Current)

The current DTC is displayed on Subaru 
Select Monitor display screen.

(Old)

The latest DTC in previous troubles is 
displayed on Subaru Select Monitor dis-
play screen.

(Older)

The second latest DTC in previous trou-
bles is displayed on Subaru Select Moni-
tor display screen.

(Before 3)

The third latest DTC in previous troubles 
is displayed on Subaru Select Monitor 
display screen.

VDC(diag)-22

Inspection Mode

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

8. Inspection Mode

A: PROCEDURE

Reproduce the malfunction occurrence condition
as much as possible.
Drive the vehicle at least ten minutes.

NOTE:
Make sure the vehicle is not dragged to one side
under usual driving condition.

 

 

 

 

 

 

 

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