Subaru Legacy 2002 Service Manual page 3176

DIAGNOSTICS CHART FOR DIAGNOSIS SYSTEM (RHD MODEL)
No.
1 SELECT CONTROL PANEL TO SELF-DIAG-
NOSIS MODE.
1) Turn ignition switch to OFF.
2) While pushing "AUTO" and "REC"
switches, turn ignition switch to ON.
3) Make sure that all characters on the dis-
play blinks four times.
2 CHECK EACH SENSOR AND EACH
POTENTIOMETER.
1) Pushing self-diagnosis mode automatically
connects to sensor and potentiometer check
mode.
2) If system has the trouble for each sensor
and/or each potentiometer, DTC is indicated
on indicator.
3) If system has no trouble, DTC "20" is indi-
cated on indicator.
NOTE:
When the sunload sensor is checked inside
the passenger compartment or in the shade,
DTC "25" may appear on the indicator. Always
check the sunload sensor in a place where it
senses direct sunlight.
NOTE:
Diagnosis code appears in order each time
the "A/C" switch is pushed.
3 CHECK OPERATION OF EACH ACTUATOR,
BLOWER FAN AND COMPRESSOR
CLUTCH.
1) After finishing sensor and potentiometer
check modes, display goes to actuator check
mode when "DEF" switch is pushed.
2) Operate the actuator displaying the DTCs
two times within two seconds of each mode in
order.
3) Select operating mode by pushing every
"DEF" switch.
4) Check the operation for each mode.
¼ Air inlet:
¼ Air outlet:
¼ Air mix door:
¼ Blower fan:
¼ A/C compressor:
4 CHECK POOR CONTACT.
Check poor contact in A/C control module.
1. OPERATING MODE TABLE
Mode display 31
Air inlet FRS
Air outlet VENT
Air mix door MAX COOL MAX COOL MAX COOL
Blower fan Manual LO
A/C compressor OFF
Step
Can it be moved to the
self-diagnosis mode?
Is the DTC "20" indicated
on indicator?
Does each mode displayed
match the operating mode
table? <Ref. to AC-33,
OPERATING MODE
TABLE, SELF-DIAGNOSIS
MODE, Diagnostics Chart
for Diagnosis System (RHD
Model).>
Is there poor contact in A/C
control module?
S001648F3601
32 33
REC REC
VENT VENT
Manual
Manual LO
Me1
ON ON
AC-33
HVAC System (Auto A/C) (Diagnostics)
Check
Go to step 2.
Go to step 3.
End
Repair poor con-
tact in A/C control
module.
34 35
FRS FRS
B/L HEAT
50% 50% MAX HOT
Manual Manual Manual
Me1 Me1
ON ON
Yes No
<Ref. to AC-46,
A/C AND/OR
SELF-DIAGNO-
SIS SYSTEMS
DO NOT
OPERATE, Diag-
nostics for A/C
System Failure
(RHD Model).>
Repair each DTC.
Go to step 4.
Contact with your
Subaru distributor
service.
36 37
FRS FRS FRS
HEAT D/H DEF
MAX HOT MAX HOT
Manual
Manual HI
Me2 Me2
ON ON
38
ON