Subaru Impreza 2003 Service Manual page 2764

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
Step
1 START INSPECTIONS.
1)Perform the pre-inspection. <Ref. to AC-3,
INSPECTION, General Description.>
2)Perform the self-diagnosis. <Ref. to AC-9,
OPERATION, Diagnostics Chart for Self-diag-
nosis.>
2 CONFIRM MALFUNCTION PART.
Confirm the malfunction part with self-diagno-
sis.
3 CHECK COMPARTMENT TEMPERATURE.
1)Turn the A/C switch ON.
2)Set the temperature at maximum cold posi-
tion.
3)Check the compartment temperature
changes.
4 CHECK A/C SYSTEM RESPONSE.
Change the temperature setting, and check the
response of A/C system.
BASIC DIAGNOSTIC PROCEDURE
Does the self-diagnosis oper-
ate?
Can the malfunction part be
confirmed?
Is the compartment tempera-
ture changed?
Does the A/C system respond
quickly?
AC-2
Check
Go to step 2.
Repair the mal-
function part
according to each
diagnostics chart.
Go to step 4.
A/C system is OK. <Ref. to AC-16,
Yes No
<Ref. to AC-12, A/
C AND/OR SELF-
DIAGNOSIS SYS-
TEMS DO NOT
OPERATE, Diag-
nostics for A/C
System Malfunc-
tion.>
Go to step 3.
<Ref. to AC-16,
COMPARTMENT
TEMPERATURE
IS NOT
CHANGED OR A/
C SYSTEM DOES
NOT RESPOND
QUICKLY, Diag-
nostics for A/C
System Malfunc-
tion.>
COMPARTMENT
TEMPERATURE
IS NOT
CHANGED OR A/
C SYSTEM DOES
NOT RESPOND
QUICKLY, Diag-
nostics for A/C
System Malfunc-
tion.>