Subaru LEGACY 2006 Manual page 94

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Step
24 CHECK HARNESS BETWEEN MAIN FAN
RELAY 2 AND ECM.
Measure the resistance between main fan
relay 2 terminal and ECM connector.
Connector & terminal
(B135) No. 34 — (F27) No. 3:
25 CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse No. 4 and 26.
3) Check the condition of fuse.
26 CHECK POOR CONTACT.
Check for poor contact of the ECM connector.
27 CHECK OPERATION OF RADIATOR FAN.
If the both fans do not rotate at high speed in
the condition of step 2, check whether the sub
fan is rotating.
28 CHECK GROUND CIRCUIT OF MAIN FAN
RELAY 2.
1) Remove the main fan relay 2 from A/C relay
holder.
2) Measure the resistance between main fan
relay 2 terminal and chassis ground.
Connector & terminal
(F27) No. 4 — Chassis ground:
29 CHECK POWER SUPPLY TO MAIN FAN RE-
LAY 2.
1) Turn the ignition switch to ON.
2) Measure the voltage between main fan
relay 2 terminal and chassis ground.
Connector & terminal
(F27) No. 1 (+) — Chassis ground (–):
30 CHECK MAIN FAN RELAY 2.
1) Turn the ignition switch to OFF.
2) Remove the main fan relay 2.
3) Measure the resistance of main fan relay 2.
Terminal
(F27) No. 2 — (F27) No. 4:
31 CHECK MAIN FAN RELAY 2.
1) Connect the battery to main fan relay 2 ter-
minals No. 1 and No. 3.
2) Measure the resistance of main fan relay 2.
Terminal
(F27) No. 4 — (F27) No. 5:
Radiator Fan System
Check
Is the resistance less than 1
Ω?
Is the fuse blown out?
Is there poor contact in ECM
connector?
Does the sub fan rotate?
Is the resistance less than 1
Ω?
Is the voltage more than 10 V? Go to step 30.
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
CO(H4SO)-11
COOLING
Yes No
Go to step 25. Repair the open
circuit of the har-
ness between
main fan relay 2
terminal and ECM.
Replace the fuse. Go to step 26.
Repair poor con- Repair the power
tact of the ECM supply circuit to
connector. the main fuse box.
Go to step 20. Go to step 28.
Go to step 29. Repair the open
circuit of harness
between main fan
relay 2 and chas-
sis ground.
Repair the power
supply line.
Go to step 31. Replace the main
fan relay 2.
Go to step 23.
Replace the main
fan relay 2.