Subaru Legacy 2004 Service Manual page 3093

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
1 CHECK IGNITION SWITCH.
2 CHECK BATTERY.
1) Turn the ignition switch to OFF.
2) Measure the battery voltage.
3 CHECK BATTERY TERMINAL.
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 system can
be executed normally.
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
systems can be executed normally.
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. 10 — Chassis ground:
7 CHECK OUTPUT SIGNAL FOR VDCCM&H/
U.
1) Turn the ignition switch to ON.
2) Measure the voltage between VDCCM&H/
U and chassis ground.
Connector & terminal
(B40) No. 10 (+) — Chassis ground (
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. 26 — (B40) No. 10:
9 CHECK INSTALLATION OF VDCCM&H/U
CONNECTOR.
Turn the ignition switch to OFF.
Subaru Select Monitor
Check
Is the ignition switch ON?
Is the voltage more than 11 V? Go to step 3.
Is there poor contact at battery
terminal?
Are the system name and
model year displayed on Sub-
aru Select Monitor?
Are the system name and
model year displayed on Sub-
aru Select Monitor?
Is the resistance more than 1
M&?
Is the voltage less than 1 V?
#
):
Is the resistance less than 0.5
&?
Is the VDCCM&H/U connector
inserted into VDCCM&H/U
until the clamp locks onto it?
VDC(diag)-20
Yes
Go to step 2. Turn the ignition
switch to ON, and
select VDC mode
using Subaru
Select Monitor.
Charge or replace
the battery.
Repair or tighten Go to step 4.
the battery termi-
nal.
Go to step 8. Go to step 5.
Replace the Go to step 6.
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
Go to step 7. Repair the har-
ness and connec-
tor between each
control module
and data link con-
nector.
Go to step 8. Repair the har-
ness and connec-
tor between each
control module
and data link con-
nector.
Go to step 9. Repair the har-
ness and connec-
tor between
VDCCM&H/U and
data link connec-
tor.
Go to step 10. Insert the
VDCCM&H/U con-
nector into
VDCCM&H/U.
No