Subaru LEGACY 2003 Service Manual page 89

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK GROUND SHORT OF SENSOR AND
HARNESS.
1) Turn ignition switch OFF.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCCM con-
nector and chassis ground.
Connector & terminal
(F87) No. 63 — Chassis ground (Lateral
G sensor):
(F87) No. 78 — Chassis ground (Pres-
sure sensor):
Does the measured value exceed the spec-
ified value?
2 CHECK GROUND SHORT OF HARNESS.
1) Disconnect connector from faulty sensors.
2) Measure resistance between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 63 — Chassis ground (Lateral
G sensor):
(F87) No. 78 — Chassis ground (Pres-
sure sensor):
Does the measured value exceed the spec-
ified value?
3 CHECK BATTERY SHORT OF SENSOR AND
HARNESS.
Measure voltage between VDCCM and chas-
sis ground.
Connector & terminal
(F87) No. 63 (+) — Chassis ground ( − − − − )
(Lateral G sensor):
(F87) No. 78 (+) — Chassis ground ( − − − − )
(Pressure sensor):
Is the measured value less than the specified
value?
4 CHECK BATTERY SHORT OF SENSOR AND
HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 63 (+) — Chassis ground ( − − − − )
(Lateral G sensor):
(F87) No. 78 (+) — Chassis ground ( − − − − )
(Pressure sensor):
Is the measured value less than the speci-
fied value?
5 CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from faulty sensors.
3) Measure voltage between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 63 (+) — Chassis ground ( − − − − )
(Lateral G sensor):
(F87) No. 78 (+) — Chassis ground ( − − − − )
(Pressure sensor):
Is the measured value less than the speci-
fied value?
Value
1 MΩ
1 MΩ
0.5 V
0.5 V
0.5 V
VDC-87
VDC (DIAGNOSTICS)
Yes
Go to step 3. Go to step 2.
Replace faulty Repair or replace
sensors. harness connec-
tor between
VDCCM and faulty
sensor.
Go to step 4. Go to step 5.
Replace VDCCM. Go to step 5.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
Go to step 6. Repair or replace
harness connec-
tor between
VDCCM and faulty
sensor.
No