Subaru LEGACY 2003 Service Manual page 104

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
VDC (DIAGNOSTICS)
7 CHECK POWER SUPPLY FOR VALVE RE-
LAY.
1) Disconnect connector (F89) from relay box.
2) Measure voltage between relay box con-
nector and chassis ground.
Connector & terminal
(F89) No. 1 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
8 CHECK OPEN CIRCUIT AND GROUND
SHORT IN POWER SUPPLY CIRCUIT OF
RELAY BOX.
1) Disconnect connector (VDC1) from VDCH/
U.
2) Connect connector (F89) to relay box.
3) Measure voltage of relay box.
Connector & terminal
(VDC6) No. 87 (+) — Chassis ground ( − − − −
):
Is the measured value within the specified
range?
9 CHECK OPEN CIRCUIT IN CONTROL CIR-
CUIT OF RELAY BOX.
1) Turn ignition switch to OFF.
2) Disconnect connector (F90) from relay box.
3) Measure resistance between relay box
connector and valve relay installing point.
Connector & terminal
(VDC4) No. 5 — (VDC6) No. 85:
(VDC4) No. 1 — (VDC6) No. 86:
Is the measured value less than the speci-
fied value?
10 CHECK GROUND SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure resistance between relay box con-
nector and chassis ground.
Connector & terminal
(VDC4) No. 5 (+) — Chassis ground ( − − − − ):
(VDC4) No. 1 (+)— Chassis ground ( − − − − ):
Does the measured value exceed the specified
value?
11 CHECK BATTERY SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure voltage between relay box connector
and chassis ground.
Connector & terminal
(VDC4) No. 5 (+) — Chassis ground ( − − − − ):
(VDC4) No. 1 (+) — Chassis ground ( − − − − ):
Is the measured value less than the specified
value?
Step Value
10 — 15 V
10 — 15 V
0.5 Ω
1 MΩ
1 V
VDC-102
Yes
Go to step 8. Repair harness
between battery
and relay box con-
nector. Check fuse
No. 8.
Go to step 9. Replace relay box
and check fuse
No. 8.
Go to step 10. Replace relay box.
Go to step 11. Replace relay box
and check fuse
No. 8.
Go to step 12. Replace relay box.
Check fuse No. 8.
No