Subaru Legacy 2002 Service Manual page 1123

Cooling
No.
25 CHECK FUSE.
1) Turn ignition switch to OFF.
2) Remove fuse No. 18 from joint box.
3) Check condition of fuse.
26 CHECK MAIN FAN RELAY 1.
1) Turn ignition switch to OFF.
2) Remove main fan relay 1.
3) Measure resistance of main fan relay 1.
Terminal
No. 7 — No. 8:
27 CHECK MAIN FAN RELAY.
1) Connect battery to terminals No. 5 and No.
6 of main fan relay 1.
2) Measure resistance of main fan relay 1.
Terminal
No. 7 — No. 8:
28 CHECK HARNESS BETWEEN MAIN FAN
RELAY TERMINAL AND MAIN FAN MOTOR
CONNECTOR.
Measure resistance of harness between main
fan motor connector and main fan relay 1 ter-
minal.
Connector & terminal
(F17) No. 1 — (F66) No. 8:
29 CHECK HARNESS BETWEEN MAIN FAN
RELAY 1 AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
main fan relay 1 connector and ECM connec-
tor.
Connector & terminal
(F66) No. 6 — (B137) No. 28:
30 CHECK POOR CONTACT.
Check poor contact in connector between
main fan and ECM.
31 CHECK HARNESS BETWEEN MAIN FAN
MOTOR CONNECTOR AND CHASSIS
GROUND.
1) Turn ignition switch to OFF.
2) Disconnect main fan motor connector.
3) Measure resistance of harness between
main fan motor connector and chassis
ground.
Connector & terminal
(F17) No. 3 — Chassis ground:
32 CHECK POOR CONTACT.
Check poor contact in main fan motor con-
nector.
33 CHECK HARNESS BETWEEN MAIN FAN
AND FAN RELAY.
1) Disconnect fan relay connector.
2) Measure resistance of between main fan
motor connector and fan relay connector.
Connector & terminal
(F17) No. 3 — (B253) No. 5:
RADIATOR MAIN FAN SYSTEM
Step
Is the fuse blown-out?
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
connector between main
fan motor and ECM?
Is the resistance less than
5 Ω?
Is there poor contact in
main fan motor connector?
Is the resistance less than
1 Ω?
CO(H6)-10
Check Yes
Replace fuse.
Go to step 27.
Go to step 28.
Go to step 29.
Go to step 30.
Repair poor con-
tact connector.
Go to step 32.
Repair poor con-
tact in main fan
motor connector.
Go to step 34.
No
Repair open cir-
cuit in harness
between main fan
relay 1 and igni-
tion switch.
Replace main fan
relay 1.
Replace main fan
relay 1.
Replace open cir-
cuit in harness
between main fan
motor connector
and main fan
relay 1 terminal.
Repair open cir-
cuit in harness
between main fan
relay 1 and ECM.
Contact your
Subaru distributor.
Go to step 33.
Replace main fan
motor with a new
one.
Repair open cir-
cuit between main
fan motor connec-
tor and fan relay
connector.