Subaru IMPREZA GD 2007 Series Manual page 3883

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HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
9 CHECK MAIN FAN MOTOR.
Connect the battery positive (+) terminal to ter-
minals No. 1 and No. 2, and the ground (–) ter-
minal to terminals No. 3 and No. 4.
10 CHECK SUB FAN MOTOR OPERATION.
Check the operation of the 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 the sub fan
motor.
3) Start the engine, and warm it up until engine
coolant temperature rise to 100°C (212°F)
higher.
4) Stop the engine and turn the ignition switch
to ON.
5) Measure the voltage between sub fan motor
connector and chassis ground.
Connector & terminal
(F16) No. 1 (+) — Chassis ground (–):
(F16) No. 2 (+) — Chassis ground (–):
12 CHECK SUB FAN MOTOR GROUND CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between sub fan
motor connector and chassis ground.
Connector & terminal
(F16) No. 3 — Chassis ground:
(F16) No. 4 — Chassis ground:
13 CHECK POOR CONTACT.
Check for poor contact of sub fan motor connec-
tor.
14 CHECK SUB FAN MOTOR.
Connect the battery positive (+) terminal to ter-
minals No. 1 and No. 2, and the ground (–) ter-
minal to terminals No. 3 and No. 4.
15 CHECK EACH SENSOR AND POTENTIOME-
TER.
Check the sensors and potentiometer for proper
operation using the self-diagnostic function.
<Ref. to AC(diag)-9, Diagnostic Chart for Self-
diagnosis.>
16 CHECK CONNECTION OF ASPIRATOR
HOSE.
Make sure that the aspirator hose is connected
normally.
17 CHECK EACH ACTUATOR.
Check the actuators for proper operation using
the self-diagnostic function. <Ref. to AC(diag)-
9, Diagnostic Chart for Self-diagnosis.>
18 CHECK POOR CONTACT.
Check poor contact of auto A/C control module
connector.
Diagnostics for A/C System Malfunction
Does the main fan rotate?
Does the radiator sub fan oper-
ate?
Is the voltage 10 V or more?
Is the resistance less than 1 Ω? Go to step 13.
Is there poor contact in the sub
fan motor connector?
Does the sub fan rotate?
Do each sensors and potenti-
ometer operate normally?
Is the aspirator hose connected
normally?
Do the actuators operate nor-
mally?
Is there poor contact in connec-
tor?
AC(diag)-18
Check Yes
Repair the poor
contact of main fan
motor connector.
Go to step 15.
Go to step 12.
Repair the poor
contact of sub fan
motor connector.
Repair the poor
contact of sub fan
motor connector.
Go to step 16.
Go to step 17.
Go to step 18.
Repair the connec-
tor.
No
Replace the main
fan motor with a
new part.
Go to step 11.
Repair the open
circuit of sub fan
motor power sup-
ply circuit harness.
Repair the open
circuit of harness
between sub fan
motor connector
and chassis
ground.
Go to step 14.
Replace the sub
fan motor with a
new part.
Check the sensor
and circuit. <Ref.
to AC(diag)-25,
Diagnostic Proce-
dure for Sensors.>
Repair the aspira-
tor hose connec-
tion.
Check the actua-
tor and circuit.
<Ref. to AC(diag)-
19, Diagnostic Pro-
cedure for Actua-
tors.>
Replace the auto
A/C control mod-
ule.