Subaru 2009 IMPREZA Service Manual page 1191

Step
9 CHECK HARNESS BETWEEN SUB FAN RE-
LAY TERMINAL AND SUB FAN MOTOR
CONNECTOR.
1) Disconnect the connector from the sub fan
motor.
2) Measure the resistance of harness between
the sub fan relay terminal and sub fan motor
connector.
Connector & terminal
(F16) No. 1 — (F27) No. 11:
10 CHECK HARNESS BETWEEN SUB FAN MO-
TOR CONNECTOR AND MAIN FAN RELAY 2
CONNECTOR.
1) Remove main fan relay 2 from the relay
holder.
2) Measure the resistance of harness between
sub fan motor connector and main fan relay 2
connector.
Connector & terminal
(F16) No. 2 — (F27) No. 18:
11 CHECK POOR CONTACT.
Check poor contact of sub fan motor connector.
12 CHECK SUB FAN MOTOR.
Connect the battery positive (+) terminal to ter-
minal No. 1 of the sub fan motor, and the ground
(–) terminal to terminal No. 2.
13 CHECK MAIN FAN RELAY 2.
Measure the resistance of main fan relay 2.
Terminals
No. 21 — No. 18:
14 CHECK HARNESS BETWEEN MAIN FAN
RELAY 2 AND MAIN FAN MOTOR CONNEC-
TOR.
1) Disconnect the connector from the main fan
motor.
2) Measure the resistance of the harness
between main fan relay 2 terminal and main fan
motor connector.
Connector & terminal
(F17) No. 1 — (F27) No. 21:
15 CHECK MAIN FAN MOTOR AND GROUND
CIRCUIT.
Measure the resistance between main fan
motor connector and chassis ground.
Connector & terminal
(F17) No. 2 — Chassis ground:
16 CHECK POOR CONTACT.
Check poor contact of main fan motor connec-
tor.
17 CHECK MAIN FAN MOTOR.
Connect the battery positive (+) terminal to ter-
minal No. 1 of the main fan motor, and the
ground (–) terminal to terminal No. 2.
Radiator Fan System
Check
Is the resistance less than 1 ? Go to step 10.
Is the resistance less than 1 ? Go to step 11.
Is there poor contact of the sub
fan motor connector?
Does the radiator sub fan
rotate?
Is the resistance less than 1 ? Go to step 14.
Is the resistance less than 1 ? Go to step 15.
Is the resistance less than 5 ? Go to step 16.
Is there poor contact of the
main fan motor connector?
Does the radiator main fan
rotate?
CO(H4DOTC)-11
COOLING
Yes No
Repair the open
circuit of harness
between sub fan
relay terminal and
sub fan motor con-
nector.
Repair the open
circuit of the har-
ness between sub
fan motor connec-
tor and main fan
relay 2 connector.
Repair the poor Go to step 12.
contact of sub fan
motor connector.
Go to step 13. Replace the sub
fan motor.
Replace the main
fan relay 2.
Repair the open
circuit of the har-
ness between
main fan relay 2
terminal and main
fan motor connec-
tor.
Repair the open
circuit of the har-
ness between
main fan motor
connector and
chassis ground.
Repair the poor Go to step 17.
contact of main fan
motor connector.
Go to step 18. Replace the main
fan motor.