Subaru IMPREZA 2002 Service Manual page 229

RADIATOR SUB FAN SYSTEM
COOLING
s the voltage more than 10 V?
Step
7
CHECK POWER SUPPLY TO SUB 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 sub fan
motor.
3)Start the engine, and warm it up until engine
coolant temperature increases over 96°C
(205°F).
4)Turn the A/C switch ON.
5)Measure the voltage while A/C compressor
is rotating.
6)Measure the voltage between sub fan motor
connector and chassis ground.
Connector & terminal
(F16) No. 2 (+)
-
Chassis ground (-):
Check the poor contact in sub fan motor con-
nector.
Connect the battery positive (+) terminal toter
minal No. 2, and negative (-)terminal to termi
nal No. 1 of sub fan motor connector.
CHECK POWER SUPPLY TO SUB FAN
RELAY2.
1)Turn the ignition switch to OFF.
2)Remove the sub fan relay2 from N C relay
holder.
3)Measure the voltage between sub fan relay2
terminal and chassis ground.
8 CHECK POOR CONTACT.
9 CHECK SUB FAN MOTOR.
!O
Connector & terminal
(F29) No. 18 (+)
-
Chassis ground ( - ) :
!l
CHECK POWER SUPPLY TO SUB FAN
RELAYS.
1)Turn the ignition switch to ON.
2)Measure the voltage between sub fan relay2
terminal and chassis ground.
Connector & terminal
(F29) No. 20 (+)
-
Chassis ground ( - ) :
1)Remove the 20 A fuse from A/C relay holdet
2)Check the condition of fuse.
CHECK POWER SUPPLY TO A/C RELAY
HOLDER 30 A FUSE TERMINAL.
Measure the voltage of harness between A/C
relay holder 20 A fuse terminal and chassis
ground.
!2 CHECK 20 A FUSE.
!3
Connector & terminal
(F27) No. 3 (+)
-
Chassis ground (-):
!4 . CHECKFUSE.
1)Turn the ignition switch to OFF.
2)Remove the fuse No. 17 from joint box.
3)Check the condition of fuse.
Go to step 23.
Check
s the voltage
more
than 10 V?
s
the fuse blown-out?
Yes
30 to step 18.
Replace fuse.
s
there poor contact in sub fan Repair the poor
notor connector?
contact in sub fan
motor connector.
loes the main fan rotate? Repair the poor
contact in sub fan
----I
motor connector.
s the fuse blown-out?
s the voltage more than 10 V? Go to step 21.
P
Replace the fuse.
s the voltage more than 10 V? Repair the open
circuit in harness
between 20 A fuse
and sub fan relay
i
terminal.
No
30 to step 20.
30 to step 19.
Replace the sub
Ian motor with a
new one.
Go to step 22.
Go to step 24.
Go to step 23.
Repair the open
circuit in harness
between sub fuse
box connector ana
20 A fuse terminal
Repair the open
circuit in harness
between sub fan
relay and ignition
switch.
CO-23