Mazda CX-5 Service & Repair Manual: A/C Compressor Control [Full Auto Air Conditioner]
Purpose
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The A/C compressor control switches the A/C compressor on/off according to the vehicle environment.
Function
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The A/C compressor control turns the A/C compressor on/off based on the climate control unit operation and signals from each sensor.
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The A/C compressor control has automatic and manual controls.
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The A/C compressor automatic control performs the following correction:
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Defroster correction
A/C compressor automatic control
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The climate control unit determines the A/C ON/OFF mode based on the ambient temperature.
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The climate control unit determines the A/C signal on/off according to the air conditioner operation such as A/C ON mode (A/C switch ON) or AUTO mode (AUTO switch ON).
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In A/C ON mode, the A/C signal (magnetic clutch) on/off is determined based on the ambient temperature and the temperature of the air passing through the evaporator.
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In AUTO mode, the A/C signal (magnetic clutch) on/off is determined based on the ambient temperature calculation value and the temperature of the air passing through the evaporator.
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The ambient temperature calculation value is calculated based on the ambient temperature, set temperature, cabin temperature, and sunlight intensity.
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When the ambient temperature is low, the A/C signal (magnetic clutch) OFF temperature is set lower to prevent window fogging.
A/C compressor manual control
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The climate control unit switches the A/C ON/OFF mode according to the A/C switch operation.
|
A/C mode |
Operation condition |
|
|
A/C ON mode (A/C display) |
Fixed in A/C mode. |
|
|
A/C OFF mode (No display) |
Fixed in A/C OFF mode. |
|
Correction
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Defroster correction
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When the defroster switch is turned on, the system is switched to A/C ON mode to improve defogging.
Construction
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The A/C compressor control consists of the parts indicated in the following table:
|
Input device |
Control part |
Output device |
|
|
|
Operation
1. The climate control determines the A/C ON/OFF based on the operations of each switch/dial and signals from each sensor which changes according to the vehicle environment.
2. The climate control unit sends the A/C signal to the PCM according to the result of the A/C ON/OFF determination and corrections.
3. When the PCM turns the A/C relay on based on the A/C signal, the magnetic clutch of the A/C compressor turns on.
A/C Compressor
Purpose
The A/C compressor circulates the refrigerant in the refrigerant cycle.
The A/C compressor compresses the gaseous refrigerant atomized by the evaporator,
and by pressurizing ...
A/C Compressor Removal/Installation
1. Disconnect the negative battery cable..
2. Discharge the refrigerant..
3. Remove the front under cover No.2..
4. Remove the drive belt..
5. Disconnect the connector.
6. Remove bolts A ...
Other materials:
Identification Numbers
Vehicle Information Labels
Vehicle Identification Number
The vehicle identification number legally identifies your vehicle. The number
is on a plate attached to the left top side of the dashboard. This plate can easily
be seen through the windshield.
Motor Vehicle Safety Standard Label
...
A/C Unit Disassembly/Assembly
1. Disassemble in the order indicated in the table.
CAUTION:
If a non-specified grease is used, it may result in abnormal noise or improper
operation of the links. Apply only the specified grease to each link.
2. Assemble in the reverse order of disassembly.
...
Solar Radiation Sensor [Full Auto Air Conditioner]
Purpose
The solar radiation sensor detects the sunlight intensity emitted to the
cabin.
Function
The solar radiation sensor converts the detected solar radiation amount to
an electric signal.
Construction
A photodiode (light receiving diode) has been adopted fo ...
