Subaru LEGACY 2003 Service Manual page 223

DIAGNOSTICS CHART WITH SELECT MONITOR
Step
12 CHECK BATTERY SHORT IN 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. 6 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
13 CHECK OPEN CIRCUIT IN RELAY CON-
TROL SYSTEM HARNESS.
Measure resistance between VDCCM connec-
tor and relay box connector.
Connector & terminal
(F87) No. 22 — (F90) No. 4:
(F87) No. 10 — (F90) No. 6:
Is the measured value less than the specified
value?
14 CHECK GROUND SHORT IN HARNESS BE-
TWEEN RELAY BOX AND VDCCM.
Measure resistance between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 22 — Chassis ground:
(F87) No. 10 — Chassis ground:
Does the measured value exceed the specified
value?
15 CHECK BATTERY SHORT IN HARNESS BE-
TWEEN RELAY BOX AND VDCCM.
Measure voltage between VDCCM connector
and chassis ground.
Connector & terminal
(F87) No. 10 (+) — Chassis ground ( − − − − ):
Is the measured value less than the specified
value?
16 CHECK BATTERY SHORT IN HARNESS BE-
TWEEN RELAY BOX AND VDCCM.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 10 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
17 CHECK POOR CONTACT IN CONNECTORS.
Turn ignition switch to OFF.
Is there poor contact in connector between
VDCH/U, relay box and VDCCM?
18 CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the diagnostic trouble code.
Is the same diagnostic trouble code as in
the current diagnosis still being output?
Value
1 V
0.5 Ω
1 MΩ
1 V
1 V
There is poor contact.
Same DTC indicated.
VDC-221
VDC (DIAGNOSTICS)
Yes
Go to step 13. Replace relay box.
Go to step 14. Repair harness
connector
between VDCCM
and relay box.
Go to step 15. Repair harness
between VDCCM
and relay box.
Check fuse SBF
holder.
Go to step 16. Repair harness
between VDCCM
and relay box.
Check fuse SBF
holder.
Go to step 17. Repair harness
between VDCCM
and relay box.
Check fuse SBF
holder.
Repair connector. Go to step 18.
Replace VDCCM. Go to step 19.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
No