Subaru LEGACY 2003 Service Manual page 106

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
VDC (DIAGNOSTICS)
18 CHECK GROUND SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure resistance between VDCH/U connec-
tor and chassis ground.
Connector & terminal
(VDC1) No. 2 — Chassis ground:
Does the measured value exceed the specified
value?
19 CHECK BATTERY SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure voltage between VDCH/U connector
and chassis ground.
Connector & terminal
(VDC1) No. 2 (+) — Chassis ground ( − − − − ):
Is the measured value less than the specified
value?
20 CHECK BATTERY SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
1) Turn ignition switch to ON.
2) Measure voltage between VDCH/U con-
nector and chassis ground.
Connector & terminal
(VDC1) No. 2 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
21 CHECK RESISTANCE OF INLET AND CUT
SOLENOID VALVES.
1) Disconnect connector from VDCH/U.
2) Measure resistance between VDCH/U con-
nector terminals.
Connector & terminal
(VDC5) No. 8 — (VDC2) No. 2:
(VDC5) No. 5 — (VDC2) No. 2:
(VDC5) No. 6 — (VDC2) No. 2:
(VDC5) No. 7 — (VDC2) No. 2:
(VDC5) No. 9 — (VDC2) No. 2:
(VDC5) No. 12 — (VDC2) No. 2:
Is the measured value within the specified
range?
22 CHECK RESISTANCE OF OUTLET SOLE-
NOID VALVE.
Measure resistance between VDCH/U connec-
tor terminals.
Connector & terminal
(VDC5) No. 4 — (VDC2) No. 2:
(VDC5) No. 1 — (VDC2) No. 2:
(VDC5) No. 2 — (VDC2) No. 2:
(VDC5) No. 3 — (VDC2) No. 2:
(VDC5) No. 10 — (VDC2) No. 2:
(VDC5) No. 11 — (VDC2) No. 2:
Is the measured value within the specified
range?
Step Value
1 MΩ
1 V
1 V
8.04 — 9.04 Ω
4.04 — 4.54 Ω
VDC-104
Yes
Go to step 19. Replace relay box
and check fuse
No. 8.
Go to step 20. Replace relay box.
Check fuse No. 8.
Go to step 21. Replace relay box.
Check fuse No. 8.
Go to step 22. Replace VDCH/U.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
Go to step 23. Replace VDCH/U.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
No