Subaru Legacy 2002 Service Manual page 3172

DIAGNOSTICS CHART FOR DIAGNOSIS SYSTEM (LHD MODEL)
No.
1 SELECT CONTROL PANEL TO SELF-DIAG-
NOSIS MODE.
1) Turn ignition switch to OFF.
2) While pushing "AUTO" and "REC"
switches, start the engine.
2 CHECK INDICATOR.
1) Turn temperature select dial clockwise by
one click.
2) Make sure that all characters illuminate on
the display.
3 CHECK EACH SENSOR AND EACH
POTENTIOMETER.
1) Turn temperature select dial clockwise by
one click.
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.
4 CHECK DOOR MOTOR POSITION SWITCH.
1) Turn temperature select dial clockwise by
one click.
2) If system has the trouble for each door
position switch, DTC is indicated on indicator.
3) If system has no trouble, DTC "30" is indi-
cated on indicator.
5 CHECK OPERATION OF EACH ACTUATOR,
BLOWER FAN AND COMPRESSOR
CLUTCH.
1) Turn temperature select dial clockwise by
one click.
2) Select operating mode by pushing every
"DEF" switch.
3) Check the operation for each mode.
¼ Air inlet:
¼ Air outlet:
¼ Air mix door:
¼ Blower fan:
¼ A/C compressor:
Step
Can it be moved to the
self-diagnosis mode?
Does each character illumi-
nate?
Is the DTC "20" indicated
on indicator?
Is the DTC "30" indicated
on indicator?
Does each mode displayed
match the operating mode
table? <Ref. to AC-30,
OPERATING MODE
TABLE, SELF-DIAGNOSIS
MODE, Diagnostics Chart
for Diagnosis System (LHD
Model).>
AC-29
HVAC System (Auto A/C) (Diagnostics)
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
No
<Ref. to AC-34,
A/C AND/OR
SELF-DIAGNO-
SIS SYSTEM DO
NOT OPERATE,
Diagnostics for
A/C System Fail-
ure (LHD
Model).>
Go to step 7.
Repair each DTC.
Repair each DTC.
Go to step 7.