Subaru Impreza 2002 Service Manual page 3234

Step
9 CHECK MAIN FAN MOTOR.
Connect the battery positive (+) terminal to ter-
minal No. 2 and 3 (turbo engine model) or 2
(non-turbo engine model), and ground (−) ter-
minal to terminal No. 1 of main fan motor con-
nector.
10 CHECK OPERATION OF SUB FAN MOTOR.
Check the operation of sub fan motor.
11 CHECK POWER SUPPLY TO SUB FAN MO-
TOR.
CAUTION:
Be careful not to overheat the engine during
repair.
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 100°C
(212°F).
4)Stop the engine and turn ignition switch to
ON.
5)Measure the voltage between sub fan motor
connector and chassis ground.
Connector & terminal
Turbo engine model:
(F16) No. 2, 3 (+) — Chassis ground ( − − − − ):
Non-turbo engine model:
(F16) No. 2 (+) — Chassis ground ( − − − − ):
12 CHECK GROUND CIRCUIT OF SUB FAN
MOTOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance between sub fan
motor connector and chassis ground.
Connector & terminal
(F16) No. 1 — Chassis ground:
13 CHECK POOR CONTACT.
Check poor contact in sub fan motor connec-
tor.
14 CHECK SUB FAN MOTOR.
Connect the battery positive (+) terminal to ter-
minal No. 2 and 3 (turbo engine model) or 2
(non-turbo engine model), and ground (−) ter-
minal to terminal No. 1 of sub fan motor con-
nector.
15 CHECK EACH SENSOR AND POTENTIOME-
TER.
Check the sensors and potentiometer for
proper operation using the self-diagnostic
function. <Ref. to AC-18, Diagnostics Chart for
Diagnosis System.>
16 CHECK CONNECTION OF ASPIRATOR
DUCT.
Make sure that the connection of aspirator duct
is correct.
17 CHECK EACH ACTUATOR.
Check the actuators for proper operation using
the self-diagnostic function.<Ref. to AC-18,
Diagnostics Chart for Diagnosis System.>
DIAGNOSTICS FOR A/C SYSTEM FAILURE
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Check
Does the main fan rotate?
Does the radiator sub fan oper-
ate?
Is the voltage more than 10 V? Go to step 12.
Is the resistance less than 1
Ω?
Is there poor contact in sub fan
motor connector?
Does the sub fan rotate?
Is the operation of each sensor
and potentiometer normal?
Is the connection of aspirator
duct correct?
Is the operation of each actua-
tor normal?
AC-29
Yes
Repair the poor Replace the main
contact in main fan fan motor with a
motor connector. new one.
Go to step 15. Go to step 11.
Repair the open
circuit in harness
for power supply
circuit.
Go to step 13. Repair the open
circuit in harness
between sub fan
motor connector
and chassis
ground.
Repair the poor Go to step 14.
contact in sub fan
motor connector.
Repair the poor Replace the sub
contact in sub fan fan motor with a
motor connector. new one.
Go to step 16. Check the sensor
and circuit. <Ref.
to AC-38, Diag-
nostic Procedure
for Sensors.>
Repair the aspira- Go to step 17.
tor duct connec-
tion.
Go to step 18. Check the actuator
and circuit. <Ref.
to AC-32, Diag-
nostic Procedure
for Actuators.>
No