Subaru Legacy 2002 Service Manual page 2574

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
No.
9 CHECK OPEN CIRCUIT IN CONTROL CIR-
CUIT OF RELAY BOX.
Measure resistance between motor relay
installing point and relay box connector.
Connector & terminal
(VDC4) No. 4 — (VDC7) No. 85:
10 CHECK OPEN CIRCUIT IN CONTROL CIR-
CUIT OF RELAY BOX.
1) Remove valve relay from relay box.
2) Measure resistance between motor relay
installing point and valve relay installing point.
Connector & terminal
(VDC7) No. 85 — (VDC6) No. 30:
11 CHECK GROUND SHORT IN CIRCUIT OF
RELAY BOX.
Measure resistance between relay box con-
nector unit and chassis ground.
Connector & terminal
(VDC4) No. 4 — Chassis ground:
(VDC4) No. 6 — Chassis ground:
12 CHECK BATTERY SHORT IN CIRCUIT OF
RELAY BOX.
Measure voltage between relay box connector
and chassis ground.
Connector & terminal
(VDC4) No. 4 (+) — Chassis ground
(−):
(VDC4) No. 6 (+) — Chassis ground
(−):
13 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. 4 (+) — Chassis ground
(−):
(VDC4) No. 6 (+) — Chassis ground
(−):
14 CHECK OPEN CIRCUIT IN RELAY CON-
TROL SYSTEM HARNESS.
1) Turn ignition switch to OFF.
2) Measure resistance between VDCCM con-
nector and relay box connector.
Connector & terminal
(F87) No. 22 — (F90) No. 4:
(F87) No. 10 — (F90) No. 6:
15 CHECK GROUND SHORT IN HARNESS
BETWEEN RELAY BOX AND VDCCM.
Measure resistance between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 22 — Chassis ground:
(F87) No. 10 — Chassis ground:
Step
Is the resistance less than
0.5 Ω?
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?
VDC-115
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.
Replace relay
box.
Replace relay
box.
Replace relay
box.
Repair harness
connector
between VDCCM
and relay box.
Repair harness
between VDCCM
and relay box.
Check fuse SBF
holder.