Subaru Legacy 2002 Service Manual page 2567

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
VDC (Diagnostics)
No.
16 CHECK BATTERY SHORT IN CONTROL
SYSTEM HARNESS OF VALVE RELAY.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 27 (+) — Chassis ground (−):
(F87) No. 47 (+) — Chassis ground (−):
17 CHECK OPEN CIRCUIT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure resistance between VDCH/U con-
nector and valve relay installing point.
Connector & terminal
(VDC1) No. 2 — (VDC6) No. 30:
18 CHECK GROUND SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure resistance between VDCH/U con-
nector and chassis ground.
Connector & terminal
(VDC1) No. 2 — Chassis ground:
19 CHECK BATTERY SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure voltage between VDCH/U connector
and chassis ground.
Connector & terminal
(VDC1) No. 2 (+) — Chassis ground
(−):
20 CHECK BATTERY SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
1) Turn ignition switch to ON.
2) Measure voltage between VDCH/U con-
nector and chassis ground.
Connector & terminal
(VDC1) No. 2 (+) — Chassis ground
(−):
21 CHECK RESISTANCE OF INLET AND CUT
SOLENOID VALVES.
1) Disconnect connector from VDCH/U.
2) Measure resistance between VDCH/U con-
nector terminals.
Connector & terminal
(VDC5) No. 8 — (VDC2) No. 2:
(VDC5) No. 5 — (VDC2) No. 2:
(VDC5) No. 6 — (VDC2) No. 2:
(VDC5) No. 7 — (VDC2) No. 2:
(VDC5) No. 9 — (VDC2) No. 2:
(VDC5) No. 12 — (VDC2) No. 2:
22 CHECK RESISTANCE OF OUTLET SOLE-
NOID VALVE.
Measure resistance between VDCH/U con-
nector terminals.
Connector & terminal
(VDC5) No. 4 — (VDC2) No. 2:
(VDC5) No. 1 — (VDC2) No. 2:
(VDC5) No. 2 — (VDC2) No. 2:
(VDC5) No. 3 — (VDC2) No. 2:
(VDC5) No. 10 — (VDC2) No. 2:
(VDC5) No. 11 — (VDC2) No. 2:
Step
Is the voltage less than 1
V?
Is the resistance less than
0.5 Ω?
Is the resistance more than
1 MΩ?
Is the voltage less than 1
V?
Is the voltage less than 1
V?
Is the resistance between
8.04 and 9.04 Ω?
Is the resistance between
3.8 and 4.8 Ω?
VDC-108
Check Yes
Go to step 17.
Go to step 18.
Go to step 19.
Go to step 20.
Go to step 21.
Go to step 22.
Go to step 23.
No
Repair harness
between VDCCM
and relay box.
Replace relay
box.
Replace relay box
and check fuse
No. 8.
Replace relay
box. Check fuse
No. 8.
Replace relay
box. Check fuse
No. 8.
Replace VDCH/U.
<Ref. to VDC-11,
Hydraulic Control
Unit (H/U).>
Replace VDCH/U.
<Ref. to VDC-11,
Hydraulic Control
Unit (H/U).>