Subaru 2009 IMPREZA Service Manual page 2482

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 systems 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 sys-
tems 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. 7 — Chassis ground:
7 CHECK HARNESS CONNECTOR BETWEEN
VDCCM&H/U AND DATA LINK CONNEC-
TOR.
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 (–):
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:
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 11 V or more?
Is there poor contact at the bat-
tery terminal?
Is the system name displayed
on Subaru Select Monitor?
Is the system name displayed
on Subaru Select Monitor?
Is the resistance 1 M or
more?
Is the voltage less than 1 V?
Is the resistance less than 0.5 ? Go to step 9.
Is the VDCCM&H/U connector
inserted into VDCCM&H/U until
the clamp locks onto it?
VDC(diag)-20
Yes No
Go to step 2. Turn the ignition
switch to ON, and
select VDC mode
using Subaru
Select Monitor.
Go to step 3. 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 only.
<Ref. to VDC-9,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Go to step 7. Repair the harness
and connector
between each con-
trol module and
data link connec-
tor.
Go to step 8. Repair the harness
and connector
between each con-
trol module and
data link connec-
tor.
Repair harness
and connector
between
VDCCM&H/U and
data link connec-
tor.
Go to step 10. Insert VDCCM&H/
U connector into
VDCCM&H/U.