Subaru IMPREZA 2002 Service Manual page 221

RADIATOR MAIN FAN SYSTEM
COOLING
Step
7 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 main fan
motor.
3)Start the engine, and warm it up until engine
coolant temperature increases over 96°C
(205°F).
4)Turn the AJC switch ON.
5)Measure the voltage while A/C compressor
is rotating.
6)Measure the voltage between main fan
motor connector and chassis ground.
Connector & terminal
(F17) No. 2 (+)
-
Chassis ground ( - ) :
Check poor contact in main fan motor connec-
tor.
Connect the battery positive (+)terminal toter.
minal No. 2, and negative (-) terminal to termi-
nal No. 1 of main fan motor connector.
CHECK POWER SUPPLY TO MAIN FAN
RE LAY 2.
1)Turn the ignition switch to OFF.
2)Remove the main fan relay2 from A/C relay
holder.
3)Measure the voltage between main fan
relay2 terminal and chassis ground.
8 CHECK POOR CONTACT.
9
CHECK MAIN FAN MOTOR.
!O
Connector & terminal
(F30) No. 23 (+)
-
Chassis ground ( - ) :
!1
CHECK POWER SUPPLY TO MAIN FAN
RELAY2.
1)Turn the ignition switch to ON.
2)Measure the voltage between main fan
relay2 terminal and chassis ground.
Connector & terminal
(F30) No. 21 (+)
-
Chassis ground ( - ) :
1)Remove the 20 A fuse from A/C
relay holder
2)Check condition of fuse.
CHECK POWER SUPPLY TO N C RELAY
HOLDER 20 A FUSE TERMINAL.
Measure the voltage of harness between AJC
relay holder 20 A fuse terminal and chassis
ground.
!2 CHECK 20 A FUSE.
!3
Connector & terminal
(F27) No. 1 (+)
-
Chassis ground (-):
2 4
. CHECK FUSE.
1)Turn the ignition switch to OFF.
2)Remove the fuse No. 18 from joint box.
3)Check the condition of fuse.
Check
;
the voltage more than 10 V?
j
there poor contact in main
i n motor connector?
bes
the main fan rotate?
j
the voltage more than 10 V?
the voltage more than 10 V?
s the fuse blown-out?
s
the voltage more than 10 V?
s the fuse blown-out?
Yes
30 to step 18.
3epair the poor
:ontact in main fan
notor connector.
Repair the poor
:ontact in main fan
notor connector.
So to step 21.
Go to step 25.
Replace the fuse.
Repair the open
circuit in harness
between 20 A fuse
and main fan relay
terminal.
Replace the fuse.
No
io
to step 20.
G o to step 19.
3eplace the main
an motor with a
iew one.
; o to step 22.
30 to step 24.
30 to step 23.
3epair the open
:ircuit in harness
letween main fuse
)ox connector and
?O A fuse terminal
3epair the open
:ircuit in harness
3etween main fan
'elay and ignition
Switch.
CO-15