Subaru LEGACY 2003 Service Manual page 105

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
12 CHECK BATTERY SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
1) Turn ignition switch to ON.
2) Measure voltage between relay box con-
nector and chassis ground.
Connector & terminal
(VDC4) No. 5 (+) — Chassis ground ( − − − − ):
(VDC4) No. 1 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
13 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?
14 CHECK GROUND SHORT IN CONTROL
SYSTEM HARNESS OF VALVE RELAY.
Measure resistance between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 47 (+) — Chassis ground ( − − − − ):
(F87) No. 27 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the specified
value?
15 CHECK BATTERY SHORT IN CONTROL
SYSTEM HARNESS OF VALVE RELAY.
Measure voltage between VDCCM connector
and chassis ground.
Connector & terminal
(F87) No. 27 (+) — Chassis ground ( − − − − ):
(F87) No. 47 (+) — Chassis ground ( − − − − ):
Is the measured value less than the specified
value?
16 CHECK BATTERY SHORT IN CONTROL
SYSTEM HARNESS OF VALVE RELAY.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 27 (+) — Chassis ground ( − − − − ):
(F87) No. 47 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
17 CHECK OPEN CIRCUIT IN CONTACT POINT
CIRCUIT OF RELAY BOX.
Measure resistance between VDCH/U connec-
tor and valve relay installing point.
Connector & terminal
(VDC1) No. 2 — (VDC6) No. 30:
Is the measured value less than the specified
value?
Value
1 V
0.5 Ω
1 MΩ
1 V
1 V
0.5 Ω
VDC-103
VDC (DIAGNOSTICS)
Yes
Go to step 13. Replace relay box.
Check fuse No. 8.
Go to step 14. Repair harness
between VDCCM
and relay box.
Go to step 15. Repair harness
between VDCCM
and relay box and
check all fuses.
Go to step 16. Repair harness
between VDCCM
and relay box.
Go to step 17. Repair harness
between VDCCM
and relay box.
Go to step 18. Replace relay box.
No