Subaru LEGACY 2003 Service Manual page 206

DIAGNOSTICS CHART WITH SELECT MONITOR
VDC (DIAGNOSTICS)
7 CHECK POWER SUPPLY FOR VALVE RE-
LAY.
1) Disconnect connector (F89) from relay box.
2) Turn ignition switch to ON.
3) 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) Turn ignition switch to ON.
4) 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 con-
nector 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 OPEN CIRCUIT IN CONTROL SYS-
TEM HARNESS OF VALVE RELAY.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCCM con-
nector and relay box connector.
Connector & terminal
(F87) No. 47 — (F90) No. 5:
(F87) No. 27 — (F90) No. 1:
Is the measured value less than the speci-
fied value?
Step Value
10 — 15 V
10 — 15 V
0.5 Ω
1 MΩ
0.5 Ω
VDC-204
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
SBF6.
Go to step 12. Repair harness
between VDCCM
and relay box.
No