Subaru LEGACY 2003 Service Manual page 134

DIAGNOSTICS CHART WITH SELECT MONITOR
VDC (DIAGNOSTICS)
8 CHECK OUTPUT SIGNAL FOR VDCCM.
1) Turn ignition switch to ON.
2) Measure voltage between data link connec-
tor and chassis ground.
Connector & terminal
(B40) No. 5 ( + + + + ) — Chassis ground ( − − − − ):
(B40) No. 4 ( + + + + ) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
9 CHECK HARNESS/CONNECTOR BETWEEN
VDCCM AND DATA LINK CONNECTOR.
Measure resistance between VDCCM connec-
tor and data link connector.
Connector & terminal
(F87) No. 11 — (B40) No. 5:
(F87) No. 38 — (B40) No. 4:
Does the measured value exceed the specified
value?
10 CHECK INSTALLATION OF VDCCM CON-
NECTOR.
Turn ignition switch to OFF.
Is VDCCM connector inserted into VDCCM
until the clamp locks onto it?
11 CHECK POWER SUPPLY CIRCUIT.
1) Turn ignition switch to ON (engine OFF).
2) Measure ignition power supply voltage
between VDCCM connector and chassis
ground.
Connector & terminal
(F87) No. 28 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
12 CHECK HARNESS CONNECTOR BETWEEN
VDCCM AND CHASSIS GROUND.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM and
transmission.
3) Measure resistance of harness between
VDCCM and chassis ground.
Connector & terminal
(F87) No. 1 — Chassis ground:
(F87) No. 55 — Chassis ground:
Is the measured value less than the speci-
fied value?
Does the measured value exceed the spec-
ified value?
13 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in control module power
supply, ground line and data link connector?
Step Value
1 V
0.5 Ω
VDCCM connector is con-
nected and the clamp is
locked.
10 V
1 Ω
There is poor contact.
VDC-132
Yes
Repair harness Go to step 9.
and connector
between each
control module
and data link con-
nector.
Repair harness Go to step 10.
and connector
between VDCCM
and data link con-
nector.
Go to step 11. Insert VDCCM
connector into
VDCCM until the
clamp locks onto
it.
Go to step 12. Repair open circuit
in harness
between VDCCM
and battery.
Go to step 13. Repair open circuit
in harness
between VDCCM
and inhibitor side
connector, and
poor contact in
coupling connec-
tor.
Repair connector. Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
No