Subaru Legacy 2004 Service Manual page 3414

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
Step
1 START INSPECTIONS.
1) Perform the pre-inspection. <Ref. to
AC(diag)-3, INSPECTION, General Descrip-
tion.>
2) Perform the self-diagnosis. <Ref. to
AC(diag)-10, OPERATION, Diagnostic Chart
for Self-Diagnosis.>
2 IDENTIFY MALFUNCTION PART.
Identify the malfunction part with self-diagno-
sis.
3 CHECK COMPARTMENT TEMPERATURE.
1) Turn ON the A/C switch.
2) Turn the temperature control dial at maxi-
mum cool position.
3) Check the compartment temperature
change.
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
identified?
Does the compartment tem-
perature change?
Does the A/C system respond
quickly?
AC(diag)-2
Check Yes
Go to step 2.
Repair the mal-
function part in
accordance with
each diagnostic
chart.
Go to step 4.
A/C system is nor-
mal.
No
<Ref. to AC(diag)-
15, A/C OR SELF-
DIAGNOSIS SYS-
TEMS DO NOT
OPERATE, Diag-
nostics for A/C
System Malfunc-
tion.>
Go to step 3.
<Ref. to AC(diag)-
20, COMPART-
MENT TEMPERA-
TURE DOES NOT
CHANGE, OR A/C
SYSTEM DOES
NOT RESPOND
PROMPTLY.,
Diagnostics for A/
C System Mal-
function.>
<Ref. to AC(diag)-
20, COMPART-
MENT TEMPERA-
TURE DOES NOT
CHANGE, OR A/C
SYSTEM DOES
NOT RESPOND
PROMPTLY.,
Diagnostics for A/
C System Mal-
function.>