Subaru Legacy 2004 Service Manual page 346

COOLING
Step
14 CHECK HARNESS BETWEEN MAIN FAN
RELAY 2 TERMINAL AND MAIN FAN MO-
TOR CONNECTOR.
1) Disconnect the connector from main fan
motor.
2) Measure the resistance of harness
between main fan relay 2 terminal and main
fan motor connector.
Connector & terminal
(F17) No. 2 — (F27) No. 2:
15 CHECK MAIN FAN MOTOR AND GROUND
CIRCUIT.
Measure the resistance between main fan
motor connector and chassis ground.
Connector & terminal
(F17) No. 1 — Chassis ground:
16 CHECK POOR CONTACT.
Check poor contact in main fan motor connec-
tor.
17 CHECK MAIN FAN MOTOR.
Connect the battery positive (+) terminal to ter-
minal No. 2 of main fan motor, and the ground
($) terminal to terminal No. 1.
18 CHECK HARNESS BETWEEN SUB FAN RE-
LAY AND ECM.
1) Disconnect the connector from ECM.
2) Measure the resistance between sub fan
relay terminal and ECM connector.
Connector & terminal
2.5 L EC, EK, K4 model
(B134) No. 31 — (F27) No. 22:
Except for 2.5 L EC, EK, K4 model
(B134) No. 10 — (F27) No. 22:
19 CHECK POOR CONTACT.
Check poor contact in ECM connector.
20 CHECK MAIN FAN RELAY 1.
1) Turn the ignition switch to OFF.
2) Remove the main fan relay 1 from A/C relay
holder.
3) Measure the resistance of terminal in main
fan relay 1 switch.
21 CHECK MAIN FAN RELAY 1.
1) Connect the battery to terminal of main fan
relay 1 coil.
2) Measure the resistance between terminals
of main fan relay 1 switch.
Radiator Fan System
Check
Is the resistance less than 1
(?
Is the resistance less than 5
(?
Is there poor contact in main
fan motor connector?
Does the main fan rotate?
Is the resistance less than 1
(?
Is there poor contact in ECM
connector?
Is the resistance more than 1
M(?
Is the resistance less than 1
(?
CO(H4SO 2.0)-10
Yes
Go to step 15. Repair the open
circuit of harness
between main fan
relay 2 terminal
and main fan
motor connector.
Go to step 16. Repair the open
circuit in harness
between main fan
motor connector
and chassis
ground.
Repair the poor Go to step 17.
contact in main fan
motor connector.
Go to step 18. Replace the main
fan motor.
Go to step 19. Repair the open
circuit in harness
between sub fan
relay terminal and
ECM.
Repair the poor Check the DTC.
contact in ECM Repair the trouble
connector. cause. <Ref. to
EN(H4SO
2.0)(diag)-31,
Read Diagnostic
Trouble Code
(DTC).> <Ref. to
EN(H4SO
2.5)(diag)-33,
Read Diagnostic
Trouble Code
(DTC).>
Go to step 21. Replace the main
fan relay 1.
Go to step 22. Replace the main
fan relay 1.
No