Subaru Legacy 2004 Service Manual page 345

Step
4 CHECK POWER SUPPLY TO SUB FAN RE-
LAY.
1) Turn the ignition switch to ON.
2) Measure the voltage between sub fan relay
terminal and chassis ground.
Connector & terminal
(F27) No. 23 (+) — Chassis ground (
5 CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse No. 3.
3) Check the condition of fuse.
6 CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse No. 22.
3) Check the condition of fuse.
7 CHECK SUB FAN RELAY.
1) Turn the ignition switch to OFF.
2) Measure the resistance between sub fan
relay terminals.
Terminals
No. 20 — No. 21:
8 CHECK SUB FAN RELAY.
1) Connect the battery to terminals No. 22 and
No. 23 of sub fan relay.
2) Measure the resistance between sub fan
relay terminals.
Terminals
No. 20 — No. 21:
9 CHECK HARNESS BETWEEN SUB FAN RE-
LAY TERMINAL AND SUB FAN MOTOR
CONNECTOR.
1) Disconnect the connector from sub fan
motor.
2) Measure the resistance of harness
between sub fan relay terminal and sub fan
motor connector.
Connector & terminal
(F16) No. 2 — (F27) No. 21:
10 CHECK HARNESS BETWEEN SUB FAN MO-
TOR CONNECTOR AND MAIN FAN RELAY 2
CONNECTOR.
1) Remove the main fan relay 2 from A/C relay
holder.
2) Measure the resistance of harness
between sub fan motor connector and main fan
relay 2 connector.
Connector & terminal
(F16) No. 1 — (F27) No. 5:
11 CHECK POOR CONTACT.
Check the poor contact in sub fan motor con-
nector.
12 CHECK SUB FAN MOTOR.
Connect the battery positive (+) terminal to ter-
minal No. 2 of sub fan motor, and the ground ($
) terminal to terminal No. 1.
13 CHECK MAIN FAN RELAY 2.
Measure the resistance of main fan relay 2.
Terminals
No. 2 — No. 5:
Radiator Fan System
Check
Is the voltage more than 10 V? Go to step 7.
$
):
Is the fuse blown out?
Is the fuse blown out?
Is the resistance more than 1
M(?
Is the resistance less than 1
(?
Is the resistance less than 1
(?
Is the resistance less than 1
(?
Is there poor contact in sub fan
motor connector?
Does the sub fan rotate?
Is the resistance less than 1
(?
CO(H4SO 2.0)-9
Yes
Go to step 6.
Replace the fuse. Repair the power
supply line.
Replace the fuse. Repair the power
supply line.
Go to step 8. Replace the sub
fan relay.
Go to step 9. Replace the sub
fan relay.
Go to step 10. Measure the open
circuit of harness
between sub fan
relay terminal and
sub fan motor con-
nector.
Go to step 11. Repair the open
harness between
sub fan motor con-
nector and main
fan relay 2 connec-
tor.
Repair the poor Go to step 12.
contact in sub fan
motor connector.
Go to step 13. Replace the sub
fan motor.
Go to step 14. Replace the main
fan relay 2.
COOLING
No