Subaru LEGACY 2006 Manual page 4175

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VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
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 THE VDCCM&H/U OUTPUT SIG-
NALS.
1) Turn the ignition switch to ON.
2) Measure the voltage between data link con-
nector and chassis ground.
Connector & terminal
(B40) No. 10 (+) — Chassis ground (–):
8 CHECK THE HARNESS CONNECTOR BE-
TWEEN VDCCM&H/U AND DATA LINK CON-
NECTOR.
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.
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. 14 (+) — Chassis ground (–):
Subaru Select Monitor
Check
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
MΩ?
Is the voltage less than 1 V?
Is the resistance less than 0.5
Ω?
Is the VDCCM&H/U connector
inserted into VDCCM&H/U
until the clamp locks onto it?
Is the voltage 10 — 15 V?
VDC(diag)-22
Yes No
Repair or tighten Go to step 4.
the battery termi-
nal.
Go to step 8. Go to step 5.
Go to step 6.
Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and 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 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.
Go to step 11.
Repair open circuit
in harness
between
VDCCM&H/U and
battery.