Subaru Legacy III (2000-2003 year). Instruction - page 866
AC-52
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
GENERAL DIAGNOSTICS
25.General Diagnostics
A: INSPECTION
Symptom
Repair order
Blower motor
Doesn't move.
Fuse
Blower motor relay
Blower motor
Blower motor resistor
Blower switch
Wire harness
Strange noise.
Blower motor
Compressor
Doesn't move.
Refrigerant
Fuse
Air conditioning relay
Magnet clutch
Compressor
Pressure switch
A/C switch
Blower switch
Wire harness
Strange noise
V-Belt
Magnet clutch
Compressor
Cold air not emitted.
Refrigerant
V-Belt
Magnet clutch
Compressor
Pressure switch
A/C switch
Blower switch
Wire harness
Heater duct
Heater vent duct
Warm air not emitted.
Engine coolant
Blower switch
Heater core
Temperature of air from vents does not change.
Engine coolant
Mode actuator
Wire harness
Unable to switch blow vents.
Mode actuator
Air flow switch
Wire harness
Unable to switch suction vents.
Air inlet select switch
FRESH/RECIRC actuator
Wire harness
HVAC SYSTEM (AUTO A/C)
(DIAGNOSTICS)
AC
Page
1.
Basic Diagnostic Procedure ..............................................................................2
2.
General Description ..........................................................................................5
3.
Electrical Components Location........................................................................8
4.
A/C Control Module I/O Signal ........................................................................10
5.
Self-Diagnosis Procedure (LHD Model) ..........................................................14
6.
Self-Diagnosis Procedure (RHD Model) .........................................................18
7.
Diagnostics for A/C System Failure (LHD Model) ...........................................20
8.
Diagnostics for A/C System Failure (RHD Model) ..........................................32
9.
List of Diagnostic Trouble Code (DTC) ...........................................................49
10.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) (LHD Model)......50
11.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) (RHD Model) .....65
12.
Symptom Related Diagnostic..........................................................................79
AC-2
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
BASIC DIAGNOSTIC PROCEDURE
1. Basic Diagnostic Procedure
A: PROCEDURE
Step
Value
Yes
No
1
START INSPECTIONS.
1) Perform pre-inspection.
2) Perform self-diagnosis.
LHD: <Ref. to AC-14, OPERATION, Self-
Diagnosis Procedure (LHD Model).>
RHD: <Ref. to AC-18, OPERATION, Self-
Diagnosis Procedure (RHD Model).>
Dose self-diagnosis operate?
Self-diagnosis operates.
LHD: <Ref. to AC-
20, A/C AND/OR
SELF-DIAGNO-
SIS SYSTEMS
DO NOT OPER-
ATE, Diagnostics
for A/C System
Failure (LHD
Model).> RHD:
<Ref. to AC-32, A/
C AND/OR SELF-
DIAGNOSIS SYS-
TEMS DO NOT
OPERATE, Diag-
nostics for A/C
System Failure
(RHD Model).>
2
CHECK DTC.
Check DTC.
Is DTC indicated?
DTC indicated.
LHD: <Ref. to AC-
50, Diagnostic
Procedure with
Diagnostic Trou-
ble Code (DTC)
(LHD Model).>
RHD:<Ref. to AC-
65, Diagnostic
Procedure with
Diagnostic Trou-
ble Code (DTC)
(RHD Model).>
3
CHECK BLOWER MOTOR OPERATION.
1) Turn blower switch ON.
2) Check blower motor operation.
Is blower motor rotated?
Blower motor rotates.
LHD: <Ref. to AC-
22, BLOWER
MOTOR DOES
NOT ROTATE,
Diagnostics for A/
C System Failure
(LHD Model).>
RHD: <Ref. to AC-
34, BLOWER
MOTOR DOES
NOT ROTATE,
Diagnostics for A/
C System Failure
(RHD Model).>
and <Ref. to AC-
38, BLOWER
MOTOR
ROTATES
ABNORMALLY,
Diagnostics for A/
C System Failure
(RHD Model).>
AC-3
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
BASIC DIAGNOSTIC PROCEDURE
4
CHECK FRESH/RECIRC MODE.
Change FRESH/RECIRC mode by pushing
mode switch.
Is FRESH/RECIRC mode changed?
FRESH/RECIRC mode
changes.
LHD: <Ref. to AC-
30, FRESH/
RECIRC DOES
NOT CHANGE,
Diagnostics for A/
C System Failure
(LHD Model).>
RHD: <Ref. to AC-
41, FRESH/
RECIRC DOES
NOT CHANGE,
Diagnostics for A/
C System Failure
(RHD Model).>
5
CHECK COMPARTMENT TEMPERATURE.
1) Turn A/C switch ON.
2) Set temperature at 18
°
C (65
°
F) (FULL
COOL).
3) Check compartment temperature changes.
Is the compartment temperature changed?
Compartment temperature
changes.
LHD: <Ref. to AC-
24, COMPART-
MENT TEMPERA-
TURE DOES NOT
CHANGE FROM
“SET” TEMPERA-
TURE OR AIR
CONDITIONING
SYSTEM DOES
NOT RESPOND
QUICKLY, Diag-
nostics for A/C
System Failure
(LHD Model).>
RHD: <Ref. to AC-
44, COMPART-
MENT TEMPERA-
TURE DOES NOT
CHANGE FROM
“SET” TEMPERA-
TURE OR AIR
CONDITIONING
SYSTEM DOES
NOT RESPOND
QUICKLY, Diag-
nostics for A/C
System Failure
(RHD Model).>
Step
Value
Yes
No
