Subaru LEGACY 2003 Service Manual page 82

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
VDC (DIAGNOSTICS)
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 ( − − − − ):
(F87) No. 43 (+) — Chassis ground ( − − − − ):
(F87) No. 8 (+) — 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?
7 CHECK VDCCM.
1) Turn ignition switch to OFF.
2) Connect all connectors.
3) Erase the memory.
4) Perform inspection mode.
5) Read out the diagnostic trouble code.
Is the same diagnostic trouble code as in
the current diagnosis still being output?
8 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Are other diagnostic trouble codes being out-
put?
9 CHECK ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM connector
terminal and chassis ground.
Connector & terminal
H4 engine RHD without OBD model
(B136) No. 7 (+) — Chassis ground ( − − − − ):
(B136) No. 8 (+) — Chassis ground ( − − − − ):
(B136) No. 2 (+) — Chassis ground ( − − − − ):
H4 engine RHD with OBD model
(B135) No. 6 (+) — Chassis ground ( − − − − ):
(B135) No. 5 (+) — Chassis ground ( − − − − ):
(B135) No. 18 (+) — Chassis ground ( − − − −
):
H4 engine LHD model
(B136) No. 7 (+) — Chassis ground ( − − − − ):
(B136) No. 8 (+) — Chassis ground ( − − − − ):
(B136) No. 2 (+) — Chassis ground ( − − − − ):
H6 engine model
(B134) No. 12 (+) — Chassis ground ( − − − −
):
(B134) No. 4 (+) — Chassis ground ( − − − − ):
(B134) No. 11 (+) — Chassis ground ( − − − −
):
Is the measured value within the specified
range?
10 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connector ECM?
Step Value
10 — 15 V
There is poor contact.
Same DTC indicated.
Other DTC indicated.
10 — 15 V
There is poor contact.
VDC-80
Yes
Go to step 6. Go to step 9.
Repair connector. Go to step 7.
Replace VDCCM. Go to step 8.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
Proceed with the A temporary poor
diagnosis corre- contact.
sponding to the
diagnostic trouble
code.
Repair harness/ Go to step 10.
connector
between ECM and
VDCCM.
Repair connector. Go to step 11.
No