Subaru Legacy 2002 Service Manual page 2565

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
VDC (Diagnostics)
No.
1 CHECK RESISTANCE OF VALVE RELAY.
1) Turn ignition switch to OFF.
2) Remove valve relay from relay box.
3) Measure resistance between valve relay
terminals.
Terminals
No. 85 — No. 86:
2 CHECK CONTACT POINT OF VALVE
RELAY.
1) Connect battery to valve relay terminals
No. 85 and No. 86.
2) Measure resistance between valve relay
terminals.
Terminals
No. 30 — No. 87:
3 CHECK CONTACT POINT OF VALVE
RELAY.
Measure resistance between valve relay ter-
minals.
Terminals
No. 30 — No. 87a:
4 CHECK CONTACT POINT OF VALVE
RELAY.
1) Disconnect battery from valve relay termi-
nals.
2) Measure resistance between valve relay
terminals.
Terminals
No. 30 — No. 87:
5 CHECK CONTACT POINT OF VALVE
RELAY.
Measure resistance between valve relay ter-
minals.
Terminals
No. 30 — No. 87a:
6 CHECK SHORT OF VALVE RELAY.
Measure resistance between valve relay ter-
minals.
Terminals
No. 86 — No. 87:
No. 86 — No. 87a:
7 CHECK POWER SUPPLY FOR VALVE
RELAY.
1) Disconnect connector (F89) from relay box.
2) Measure voltage between relay box con-
nector and chassis ground.
Connector & terminal
(F89) No. 1 (+) — Chassis ground (−):
8 CHECK OPEN CIRCUIT AND GROUND
SHORT IN POWER SUPPLY CIRCUIT OF
RELAY BOX.
1) Disconnect connector (VDC1) from
VDCH/U.
2) Connect connector (F89) to relay box.
3) Measure voltage of relay box.
Connector & terminal
(VDC6) No. 87 (+) — Chassis ground
(−):
Step
Is the resistance between
93 and 113 Ω?
Is the resistance less than
0.5 Ω?
Is the resistance more than
1 MΩ?
Is the resistance more than
1 MΩ?
Is the resistance less than
0.5 Ω?
Is the resistance more than
1 MΩ?
Is the voltage between 10
and 15 V?
Is the voltage between 10
and 15 V?
VDC-106
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 valve
relay.
Replace valve
relay.
Replace valve
relay.
Replace valve
relay.
Replace valve
relay.
Replace valve
relay.
Repair harness
between battery
and relay box
connector. Check
fuse No. 8.
Replace relay box
and check fuse
No. 8.