Subaru SVX 1992 Manual page 974

4-7 IM5F6) AUTOMATIC AIR CONDITIONING SYSTEM
(1) When engine water temperature is abnormally
high
If the engine water temperature rises abnormally, the
MPFI unit issues signal A, B, C, D, or E depending on
the engine water temperature .
(2) When compressor is turned OFF
When the compressor is turned OFF by the switch
operation, the MPFI unit issues signal D (solenoid
actuator current 0.6A) for approx . seven seconds
before turning OFF.
These control items (1) and (2) are not performed by
the auto amplifier.
6) Compressor protection in case of air conditioner
trouble
If a trouble occurs in the air conditioner system and if,
for example, no air blow is generated, then, the com-
pressor is turned OFF depending on the temperature
detected by the refrigerant temperature sensor.
Compressor
ON --- ---
Compressor
OFF
-15
0 °C
(5) (32)
(°F)
6. AUTOMATIC CONTROL OF AMBIENT TEM-
PERATURE CORRECTION
The temperature data obtained by the ambient sensor is
sent to the auto amplifier as the ambient temperature .
Even if the ambient sensor measurement is influenced
by the radiator heat and a sudden abnormal rise in
temperature is measured, the auto amplifier will not
directly respond to such a temperature rise ; it only
responds slowly owing to this correction function .
Ambient temperature
correction characteristic
Ambient sensor detection
d
temperature
E
a
Ambient temperature
correction value
Time
C4-449
Fig . 88
Refrigerant temp . sensor
C4-448
Fig . 87
7) Full-throttle control
When the throttle opening is maximum, the engine
control unit (MPFI unit) turns the air conditioner relay
OFF for a period of up to twenty seconds, thereby
turning OFF the compressor.
This control is not performed by the auto amplifier.
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