Subaru LEGACY 2003 Service Manual page 10

COOLING
6 CHECK POWER SUPPLY TO MAIN FAN RE-
LAY.
1) Turn ignition switch to ON.
2) Measure voltage between main fan relay
terminal and chassis ground.
Connector & terminal
(F66) No. 5 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
7 CHECK 20 A FUSE.
1) Remove 20 A fuse from A/C relay holder.
2) Check condition of fuse.
Is the fuse blown-out?
8 CHECK POWER SUPPLY TO A/C RELAY
HOLDER 20 A FUSE TERMINAL.
Measure voltage of harness between A/C relay
holder 20 A fuse terminal and chassis ground.
Connector & terminal
(F27) No. 1 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the specified
value?
9 CHECK FUSE.
1) Turn ignition switch to OFF.
2) Remove fuse No. 18 from joint box.
3) Check fuse.
Is the fuse blown-out?
10 CHECK MAIN FAN RELAY.
1) Turn ignition switch to OFF.
2) Measure resistance of main fan relay.
Terminal
No. 8 — No. 9:
Does the measured value exceed the spec-
ified value?
11 CHECK MAIN FAN RELAY.
1) Connect battery to terminals No. 5 and No.
7 of main fan relay.
2) Measure resistance of main fan relay.
Terminal
No. 8 — No. 9:
Is the measured value less than the speci-
fied valve?
12 CHECK HARNESS BETWEEN MAIN FAN
RELAY TERMINAL AND MAIN FAN MOTOR
CONNECTOR.
Measure resistance of harness between main
fan motor connector and main fan relay termi-
nal.
Connector & terminal
(F17) No. 2 — (F66) No. 9:
Is the measured value less than the specified
valve?
RADIATOR MAIN FAN SYSTEM
Step Value
10 V
Fuse is blown-out.
10 V
Fuse is blown-out.
1 MΩ
1 Ω
1 Ω
CO(H4SO)-8
Yes
Go to step 10. Go to step 9.
Replace fuse. Go to step 8.
Repair open circuit Repair open circuit
in harness in harness
between 20 A fuse between main fuse
and main fan relay box connector and
terminal. 20 A fuse terminal.
Replace fuse. Repair open circuit
in harness
between main fan
relay and ignition
switch.
Go to step 11. Replace main fan
relay.
Go to step 12. Replace main fan
relay.
Go to step 13. Repair open circuit
in harness
between main fan
motor connector
and main fan relay
terminal.
No