Subaru Legacy 2002 Service Manual page 1128

No.
16 CHECK HARNESS BETWEEN SUB FAN
RELAY 2 AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
sub fan relay 2 connector and ECM connec-
tor.
Connector & terminal
(F29) No. 27 — (B137) No. 17:
17 CHECK POOR CONTACT.
Check poor contact in connector between sub
fan and ECM.
18 CHECK POWER SUPPLY TO SUB FAN
MOTOR.
CAUTION:
Be careful not to overheat engine during
repair.
1) Turn ignition switch to OFF.
2) Disconnect sub 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 sub fan motor
connector and chassis ground.
Connector & terminal
(F16) No. 1 (+) — Chassis ground (−):
19 CHECK POOR CONTACT.
Check poor contact in sub fan motor connec-
tor.
20 CHECK SUB FAN MOTOR.
Connect battery positive (+) terminal to termi-
nal No. 1, and negative (−) terminal to termi-
nal No. 4 of sub fan motor connector.
21 CHECK POWER SUPPLY TO SUB FAN
RELAY 1.
1) Turn ignition switch to OFF.
2) Remove sub fan relay 1 from A/C relay
holder.
3) Measure voltage between sub fan relay 1
terminal and chassis ground.
Connector & terminal
(F28) No. 23 (+) — Chassis ground (−):
22 CHECK POWER SUPPLY TO SUB FAN
RELAY 1.
1) Turn ignition switch to ON.
2) Measure voltage between sub fan relay 1
terminal and chassis ground.
Connector & terminal
(F28) No. 21 (+) — 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. 3(+) — Chassis ground (−):
RADIATOR SUB FAN SYSTEM
Step
Is the resistance less than
1 Ω?
Is there poor contact in
connector between sub fan
motor and ECM.
Is the voltage more than 10
V?
Is there poor contact in sub
fan motor connector?
Does the sub 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)-15
Check Yes
Go to step 17.
Repair poor con-
tact connector.
Go to step 19.
Repair poor con-
tact in sub fan
motor connector.
Repair poor con-
tact in sub fan
motor connector.
Go to step 22.
Go to step 26.
Replace fuse.
Repair open cir-
cuit in harness
between 30 A
fuse and sub fan
relay 1 terminal.
Cooling
No
Repair open cir-
cuit in harness
between sub fan
relay 2 and ECM.
Contact your
Subaru distributor.
Go to step 21.
Go to step 20.
Replace sub 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.