Subaru Legacy 2002 Service Manual page 2566

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
No.
9 CHECK OPEN CIRCUIT IN CONTROL CIR-
CUIT OF RELAY BOX.
1) Turn ignition switch to OFF.
2) Disconnect connector (F90) from relay box.
3) Measure resistance between relay box
connector and valve relay installing point.
Connector & terminal
(VDC4) No. 5 — (VDC6) No. 85:
(VDC4) No. 1 — (VDC6) No. 86:
10 CHECK GROUND SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure resistance between relay box con-
nector and chassis ground.
Connector & terminal
(VDC4) No. 5 — Chassis ground:
(VDC4) No. 1 — Chassis ground:
11 CHECK BATTERY SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure voltage between relay box connector
and chassis ground.
Connector & terminal
(VDC4) No. 5 (+) — Chassis ground
(−):
(VDC4) No. 1 (+) — Chassis ground
(−):
12 CHECK BATTERY SHORT IN CONTACT
POINT 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. 5 (+) — Chassis ground
(−):
(VDC4) No. 1 (+) — Chassis ground
(−):
13 CHECK OPEN CIRCUIT IN CONTROL SYS-
TEM HARNESS OF VALVE RELAY.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCCM con-
nector and relay box connector.
Connector & terminal
(F87) No. 47 — (F90) No. 5:
(F87) No. 27 — (F90) No. 1:
14 CHECK GROUND SHORT IN CONTROL
SYSTEM HARNESS OF VALVE RELAY.
Measure resistance between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 47 — Chassis ground:
(F87) No. 27 — Chassis ground:
15 CHECK BATTERY SHORT IN CONTROL
SYSTEM HARNESS OF VALVE RELAY.
Measure voltage between VDCCM connector
and chassis ground.
Connector & terminal
(F87) No. 27 (+) — Chassis ground (−):
(F87) No. 47 (+) — Chassis ground (−):
Step
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 less than
0.5 Ω?
Is the resistance more than
1 MΩ?
Is the voltage less than 1
V?
VDC-107
Check Yes
Go to step 10.
Go to step 11.
Go to step 12.
Go to step 13.
Go to step 14.
Go to step 15.
Go to step 16.
VDC (Diagnostics)
No
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.
Repair harness
between VDCCM
and relay box.
Repair harness
between VDCCM
and relay box and
check all fuses.
Repair harness
between VDCCM
and relay box.