Subaru Legacy 2002 Service Manual page 2722

DIAGNOSTICS CHART WITH SELECT MONITOR
No.
1 CHECK GROUND CIRCUIT OF PRESSURE
SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector (F91) from VDCH/U.
3) Measure resistance between VDCH/U con-
nector and chassis ground.
Connector & terminal
(F91) No. 15 — Chassis ground:
2 CHECK GROUND CIRCUIT OF VDCCM.
1) Disconnect connector from VDCCM.
2) Remove cover from VDCCM. <Ref. to
VDC-17, REMOVE, VDCCM Connector
Cover.>
3) Connect connector to VDCCM.
4) Measure resistance between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 76 — Chassis ground:
3 CHECK POOR CONTACT IN CONNEC-
TORS.
4 CHECK POWER SUPPLY OF PRESSURE
SENSOR.
NOTE:
When this inspection is carried out, DTC 51
ABNORMAL VALVE RELAY is memorized,
but this does not indicate valve relay malfunc-
tion.
1) Turn ignition switch to ON.
2) Measure voltage between VDCH/U con-
nector terminals.
Connector & terminal
(F91) No. 16 (+) — No. 15 (−):
5 CHECK POWER SUPPLY OF VDCCM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Remove cover from VDCCM. <Ref. to
VDC-17, VDCCM Connector Cover.>
4) Connect connector to VDCCM.
5) Turn ignition switch to ON.
6) Measure voltage between VDCCM connec-
tor terminals.
Connector & terminal
(F87) No. 78 (+) — No. 76 (−):
6 CHECK POOR CONTACT IN CONNEC-
TORS.
7 CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCH/U con-
nector and chassis ground.
Connector & terminal
(F91) No. 14 — Chassis ground:
Step
Is the resistance less than
0.5 Ω?
Is the resistance less than
0.5 Ω?
Is there poor contact in
VDCCM connector?
Is the voltage between 4.75
and 5.25 V?
Is the voltage between 4.75
and 5.25 V?
Is there poor contact in
VDCCM connector?
Is the resistance more than
1 MΩ?
VDC-263
Check Yes
Go to step 4.
Replace harness
between VDCH/U
and VDCCM.
Repair or replace
VDCCM connec-
tor.
Go to step 7.
Repair harness
between VDCH/U
and VDCCM.
Repair or replace
VDCCM connec-
tor.
Go to step 8.
VDC (Diagnostics)
No
Go to step 2.
Go to step 3.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
Go to step 5.
Go to step 6.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
Repair harness
between VDCH/U
and VDCCM.