Subaru Legacy 2002 Service Manual page 2673

DIAGNOSTICS CHART WITH SELECT MONITOR
VDC (Diagnostics)
No.
1 CHECK CONTACT POINT OF MOTOR
RELAY.
1) Turn ignition switch to OFF.
2) Remove motor relay from relay box.
3) Measure resistance between motor relay
terminals.
Terminals
No. 30 — No. 87:
2 CHECK SHORT OF MOTOR RELAY.
Measure resistance between motor relay ter-
minals.
Terminals
No. 85 — No. 30:
No. 85 — No. 87:
3 CHECK GROUND SHORT IN CIRCUIT OF
RELAY BOX.
1) Disconnect connector (F90) from relay box.
2) Measure resistance between relay box
connector unit and chassis ground.
Connector & terminal
(VDC4) No. 4 — Chassis ground:
4 CHECK BATTERY SHORT IN CIRCUIT OF
RELAY BOX.
Measure voltage between relay box connector
and chassis ground.
Connector & terminal
(VDC4) No. 6 (+) — Chassis ground
(−):
5 CHECK BATTERY SHORT IN CIRCUIT OF
RELAY BOX.
1) Turn ignition switch to ON.
2) Measure voltage between relay box con-
nector and chassis ground.
Connector & terminal
(VDC4) No. 6 (+) — Chassis ground
(−):
6 CHECK GROUND SHORT IN HARNESS
BETWEEN RELAY BOX AND VDCCM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCCM con-
nector and chassis ground.
Connector & terminal
(F87) No. 22 — Chassis ground:
7 CHECK BATTERY SHORT IN HARNESS
BETWEEN RELAY BOX AND VDCCM.
Measure voltage between VDCCM connector
and chassis ground.
Connector & terminal
(F87) No. 10 (+) — Chassis ground (−):
8 CHECK BATTERY SHORT IN HARNESS
BETWEEN RELAY BOX AND VDCCM.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 10 (+) — Chassis ground (−):
Step
Is the resistance more than
1 MΩ?
Is the resistance more than
1 MΩ?
Is the resistance more than
1 MΩ?
Is the voltage less than 1
V?
Is the voltage less than 1
V?
Is the resistance more than
1 MΩ?
Is the voltage less than 1
V?
Is the voltage less than 1
V?
VDC-214
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
Go to step 9.
No
Replace motor
relay.
Replace motor
relay.
Replace relay
box.
Replace relay
box.
Replace relay
box.
Repair harness
between VDCCM
and relay box.
Check fuse SBF
holder.
Repair harness
between VDCCM
and relay box.
Repair harness
between VDCCM
and relay box.