Subaru LEGACY 2004 Service Manual page 66

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
4. SENSOR CHECK TABLE
NOTE:
When the sunload sensor check is conducted indoors or in the shade, open circuit might be indicated. Always
check the sunload sensor at the place where the sun shines directly on it.
Display screen (Malfunction at
present) *1
21/AUTO Blink
$21/AUTO Blink
22/AUTO Blink
23/AUTO Blink
$23/AUTO Blink
24/AUTO Blink
25 Blink
$25/AUTO Blink
26/AUTO Blink
27/AUTO Blink
28/AUTO Blink
29/AUTO Blink
20 Blink
*1: "AUTO" display does not blink when past malfunction occurred. Past malfunction means that abnormal signal had input for a
certain time continuously in the past.
*2: Present malfunction only is displayed for sunload sensor open circuit.
5. OPERATING MODE TABLE
FRESH/RECIRC
Display screen
31
32
33
34
35
36
37
38
Diagnostic Chart for Self-Diagnosis
SENSOR
In-vehicle sensor
Ambient sensor
Evaporator sensor
Engine coolant temperature sensor
Sunload sensor
Air mix door actuator potentiometer
Mode door actuator potentiometer
Mode door
door
FRESH FACE
RECIRC FACE
RECIRC FACE
FRESH B/L
FRESH FOOT
FRESH FOOT
FRESH F/D
FRESH DEF
AC(diag)-14
Sensor trouble or communication malfunction
Sensor trouble or communication malfunction
When all conditions are normal
Air mix door Blower fan
Maximum cool LO
Maximum cool LO
Maximum cool M1
50% M1
50% M1
Maximum hot M3
Maximum hot M3
Maximum hot
Trouble contents
Broken
Short
Broken
Short
Open *2
Short
COOL
HOT
FACE
DEF
A/C compressor (Mag-
net clutch)
OFF
ON
ON
ON
ON
ON
ON
HI ON