Radiator Main Fan System; Inspection - Subaru Legacy 2002 Service Manual

Cooling
B: INSPECTION
DETECTING CONDITION:
Condition:
¼ Engine coolant temperature is above 95°C
(203°F).
No.
1 CHECK POWER SUPPLY TO MAIN FAN
MOTOR.
CAUTION:
Be careful not to overheat engine during
repair.
1) Turn ignition switch to OFF.
2) Disconnect connector from main fan motor.
3) Start the engine, and warm it up until
engine coolant temperature increases over
95°C (203°F).
4) Stop the engine and turn ignition switch to
ON.
5) Measure voltage between main fan motor
connector and chassis ground.
Connector & terminal
(F17) No. 2 (+) — Chassis ground (−):
2 CHECK GROUND CIRCUIT OF MAIN FAN
MOTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between main fan
motor connector and chassis ground.
Connector & terminal
(F17) No. 1 — Chassis ground:
3 CHECK POOR CONTACT.
Check poor contact in main fan motor con-
nector.
4 CHECK MAIN FAN MOTOR.
Connect battery positive (+) terminal to termi-
nal No. 2, and negative (−) terminal to termi-
nal No. 1 of main fan motor connector.
5 CHECK POWER SUPPLY TO MAIN FAN
RELAY.
1) Turn ignition switch to OFF.
2) Remove main fan relay from A/C relay
holder.
3) Measure voltage between main fan relay
terminal and chassis ground.
Connector & terminal
(F66) No. 7 (+) — Chassis ground (−):
6 CHECK POWER SUPPLY TO MAIN FAN
RELAY.
1) Turn ignition switch to ON.
2) Measure voltage between main fan relay
terminal and chassis ground.
Connector & terminal
(F66) No. 5 (+) — Chassis ground (−):
7 CHECK 20 A FUSE.
1) Remove 20 A fuse from A/C relay holder.
2) Check condition of fuse.

RADIATOR MAIN FAN SYSTEM

S176732A10
Step
¼ Vehicle speed is below 19 km/h (12 MPH).
TROUBLE SYMPTOM:
¼ Radiator main fan does not rotate under the
above conditions.
Check
Is the voltage more than 10
V?
Is the resistance less than
5 Ω?
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?
CO-8
Yes
Go to step 2. Go to step 5.
Go to step 3. Repair open cir-
cuit in harness
between main fan
motor connector
and chassis
ground.
Repair poor con- Go to step 4.
tact in main fan
motor connector.
Repair poor con- Replace main fan
tact in main fan motor with a new
motor connector. one.
Go to step 6. Go to step 7.
Go to step 10. Go to step 9.
Replace fuse. Go to step 8.
No