Subaru IMPREZA 2002 Service Manual page 217

RADIATOR MAIN FAN SYSTEM
COOLING
Vehicle speed is below 19 km/h (12 MPH).
TROUBLE SYMPTOM:
B: INSPECTION
1. NON-TURBO MODEL
Radiator main fan does not rotate under the
DETECTING CONDITION: above conditions.
Condition:
Engine coolant temperature is above 95°C
(203°F).
Step
1
CHECK POWER SUPPLY TO MAIN FAN MO-
TOR.
CAUTION:
Be careful not to overheat engine during re-
pair.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from the 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 the ignition switch
to ON.
5)Measure the 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 the ignition switch to OFF.
2)Measure the 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 connec-
tor.
Connect the battery positive (+) terminal toter,
minal No. 2, and the negative (-) terminal to
terminal No. 1 of main fan motor connector.
CHECK POWER SUPPLY TO MAIN FAN RE.
LAY.
1)Turn the ignition switch to
OFF.
2)Remove the main fan relay from A/C relay
holder.
3)Measure the voltage between main fan relay
terminal and chassis ground.
4 CHECK MAIN FAN MOTOR.
5
Connector & terminal
(F66) No. 26
( i )
-
Chassis ground ( - ) :
6
CHECK POWER SUPPLY TO MAIN FAN RE,
LAY.
. 1)Turn the ignition switch
to ON.
2)Measure the voltage between main fan relay
terminal and chassis ground.
Connector & terminal
(F66) No. 28 (+)
-
Chassis ground (-):
7 CHECK 20 A FUSE.
1)Remove 20 A fuse from A/C relay holder.
2)Check condition of fuse.
Check
s the voltage more than 10 V?
s the resistance less than 5
2?
s there poor contact in main
'an motor connector?
3oes the main fan rotate?
s the voltage more than 10 V?
Is the voltage more than 10 V?
Is the fuse blown-out?
Yes
30 to step 2.
30 to step 3.
Repair the poor
:ontact in main fan
motor connector.
Repair the poor
contact in main fan
motor connector.
Go to step 6.
Go to step 10.
Replace the fuse.
No
i o to step 5.
3epair the open
:ircuit in harness
)etween main fan
notor connector
md chassis
jround.
20 to step 4.
3eplace the main
an motor with a
iew one.
30 to step 7.
30 to step 9.
30 to step 8.
co-11