Subaru 2002 IMPREZA Service Manual page 335

Step
25 CHECK SUB FAN RELAY.
1)Turn the ignition switch to OFF.
2)Remove the sub fan relay2.
3)Measure the resistance of main fan relay2.
Terminal
No. 18 — No. 17:
26 CHECK MAIN FAN RELAY.
1)Connect the battery to terminals No. 19 and
No. 20 of sub fan relay2.
2)Measure the resistance of main fan relay2.
Terminal
No. 18 — No. 17:
27 CHECK HARNESS BETWEEN SUB FAN RE-
LAY TERMINAL AND SUB FAN MOTOR
CONNECTOR.
Measure the resistance of harness between
sub fan motor connector and sub fan relay2
terminal.
Connector & terminal
(F16) No. 2 — (F29) No. 17:
28 CHECK HARNESS BETWEEN SUB FAN RE-
LAY AND ECM.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
sub fan relay connector and ECM connector.
Connector & terminal
(F29) No. 19 — (B137) No. 28:
29 CHECK POOR CONTACT.
Check poor contact in connector between sub
fan and ECM.
NOTE:
Inspection by your Subaru distributor is required,
because probable cause is deterioration of multiple
parts.
RADIATOR SUB FAN SYSTEM
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
Is the resistance less than 1
Ω?
Is the resistance less than 1
Ω?
Is there poor contact in con-
nector between sub fan motor
and ECM?
CO-25
Check
Go to step 26.
Go to step 27.
Go to step 28.
Go to step 29.
Repair the poor
contact connector.
COOLING
Yes No
Replace the sub
fan relay.
Replace the sub
fan relay.
Repair the open
circuit in harness
between sub fan
motor connector
and sub fan relay
terminal.
Repair the open
circuit in harness
between sub fan
relay and ECM.
Contact with your
Subaru distributor
service.