Subaru Legacy 2002 Service Manual page 2646

DIAGNOSTICS CHART WITH SELECT MONITOR
No.
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 (Lat-
eral G sensor):
(F87) No. 78 — Chassis ground (Pres-
sure sensor):
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 (Lat-
eral G sensor):
(F87) No. 78 — Chassis ground (Pres-
sure sensor):
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):
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):
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):
6 CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 63 (+) — Chassis ground (−)
(Lateral G sensor):
(F87) No. 78 (+) — Chassis ground (−)
(Pressure sensor):
Step
Is the resistance more than
1 MΩ?
Is the resistance more than
1 MΩ?
Is the voltage less than 0.5
V?
Is the voltage less than 0.5
V?
Is the voltage less than 0.5
V?
Is the voltage less than 0.5
V?
VDC-187
Check Yes
Go to step 3.
Replace faulty
sensors.
Go to step 4.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
Go to step 6.
Replace faulty
sensor.
VDC (Diagnostics)
No
Go to step 2.
Repair or replace
harness connector
between VDCCM
and faulty sensor.
Go to step 5.
Go to step 5.
Repair or replace
harness connector
between VDCCM
and faulty sensor.
Repair or replace
harness connector
between VDCCM
and faulty sensor.