Subaru Legacy 2002 Service Manual page 1122

No.
16 CHECK HARNESS BETWEEN MAIN FAN
RELAY 2 AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
main fan relay 2 connector and ECM connec-
tor.
Connector & terminal
(F30) No. 19 — (B137) No. 17:
17 CHECK POOR CONTACT.
Check poor contact in connector between
main fan and ECM.
18 CHECK POWER SUPPLY TO MAIN FAN
MOTOR.
CAUTION:
Be careful not to overheat engine during
repair.
1) Turn ignition switch to OFF.
2) Disconnect main fan motor connector.
3) Start the engine, and warm it up until
engine coolant temperature increases over
95°C (203°F).
4) Measure voltage between main fan motor
connector and chassis ground.
Connector & terminal
(F17) No. 1 (+) — Chassis ground (−):
19 CHECK POOR CONTACT.
Check poor contact in main fan motor con-
nector.
20 CHECK MAIN FAN MOTOR.
Connect battery positive (+) terminal to termi-
nal No. 1, and negative (−) terminal to termi-
nal No. 4 of main fan motor connector.
21 CHECK POWER SUPPLY TO MAIN FAN
RELAY 1.
1) Turn ignition switch to OFF.
2) Remove main fan relay 1 from A/C relay
holder.
3) Measure voltage between main fan relay 1
terminal and chassis ground.
Connector & terminal
(F66) No. 7 (+) — Chassis ground (−):
22 CHECK POWER SUPPLY TO MAIN FAN
RELAY 1.
1) Turn ignition switch to ON.
2) Measure voltage between main fan relay 1
terminal and chassis ground.
Connector & terminal
(F66) No. 5 (+) — Chassis ground (−):
23 CHECK 30 A FUSE.
1) Remove 30 A fuse from A/C relay holder.
2) Check condition of fuse.
24 CHECK POWER SUPPLY TO A/C RELAY
HOLDER 30 A FUSE TERMINAL.
Measure voltage of harness between A/C
relay holder 30 A fuse terminal and chassis
ground.
Connector & terminal
(F27) No. 1 (+) — Chassis ground (−):
RADIATOR MAIN FAN SYSTEM
Step
Is the resistance less than
1 Ω?
Is there poor contact in
connector between main
fan motor and ECM.
Is the voltage more than 10
V?
Is there poor contact in
main fan motor connector?
Does the main fan rotate?
Is the voltage more than 10
V?
Is the voltage more than 10
V?
Is the fuse blown-out?
Is the voltage more than 10
V?
CO(H6)-9
Check Yes
Go to step 17.
Repair poor con-
tact connector.
Go to step 19.
Repair poor con-
tact in main fan
motor connector.
Repair poor con-
tact in main fan
motor connector.
Go to step 22.
Go to step 26.
Replace fuse.
Repair open cir-
cuit in harness
between 30 A
fuse and main fan
relay terminal.
Cooling
No
Repair open cir-
cuit in harness
between main fan
relay 2 and ECM.
Contact your
Subaru distributor.
Go to step 21.
Go to step 20.
Replace main fan
motor with a new
one.
Go to step 23.
Go to step 25.
Go to step 24.
Repair open cir-
cuit in harness
between main
fuse box connec-
tor and 30 A fuse
terminal.