Subaru LEGACY 2003 Service Manual page 167

DIAGNOSTICS CHART WITH SELECT MONITOR
Step
1 CHECK HARNESS/CONNECTOR BETWEEN
VDCCM AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Disconnect connector from ECM.
4) Measure resistance between VDCCM con-
nector and ECM.
Connector & terminal
H4 engine RHD without OBD model
(F87) No. 21 — (B136) No. 7:
H4 engine RHD with OBD model
(F87) No. 21 — (B135) No. 6:
H4 engine LHD model
(F87) No. 21 — (B136) No. 7:
H6 engine model
(F87) No. 21 — (B134) No. 12:
Is the measured value less than the speci-
fied value?
2 CHECK GROUND SHORT OF HARNESS.
Measure resistance between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 21 — Chassis ground:
Does the measured value exceed the specified
value?
3 CHECK BATTERY SHORT OF HARNESS.
Measure voltage between VDCCM connector
and chassis ground.
Terminal
(F87) No. 21 (+) — Chassis ground ( − − − − ):
Is the measured value less than the specified
value?
4 CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-
tor and chassis ground.
Terminal
(F87) No. 21 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
5 CHECK HARNESS/CONNECTOR BETWEEN
VDCCM AND ECM.
1) Turn ignition switch to OFF.
2) Connect connector to ECM.
3) Turn ignition switch to ON.
4) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 21 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
6 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
ECM and VDCCM?
Value
0.5 Ω
1 MΩ
0.5 V
1 V
10 — 15 V
Tightened securely.
VDC-165
VDC (DIAGNOSTICS)
Yes
Go to step 2. Repair harness/
connector
between VDCCM
and ECM.
Go to step 3. Repair harness/
connector
between VDCCM
and ECM.
Go to step 4. Repair harness/
connector
between VDCCM
and ECM.
Go to step 5. Repair harness/
connector
between VDCCM
and ECM.
Go to step 6. Go to step 9.
Repair connector. Go to step 7.
No