6. SYSTEM DIAGRAM
This figures shows the input and output system between A/C components and A/C controller.
User
Setting
Control
temperature
Ambient
temperature
Water temp.
sensor
Incar
temperature
Environ-
ments
Sun loads
AQS sensor
Intake temp.
sensor
Vehicle
Vehicle
information
speed
Air Conditioner Compressor Control by Engine ECU
In case of current vehicle models, the system turns ON/OFF the compressor switch according to refrigerant pressure,
ambient temperature and condenser temperature to protect air conditioner circuits. However, for the vehicle equipped
with DI engine, the engine ECU turns off air conditioner compressor as below in addition to above conditions.
1. Coolant temperature: below -20°C
2. Coolant temperature: over 115°C
3. For approx. 4 seconds after starting the engine
4. When engine speed is below 650 rpm
5. When engine speed is over 4,500 rpm
6. During abrupt acceleration for the vehicle equipped with manual transmission
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
transistor
Air mix motor
Air
conditioner
controller
Mode motor
Interior
/Ambient motor
Engine ECM
Fan speed control
Power
(Blower motor
control)
Temperature control
Air flow control
Interior/Ambient
control
Compressor
control
AIR CONDITIONING SYSTEM
23
6810
KYRON SM - 2005.09
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