Mazda CX-5 Service & Repair Manual: A/C Compressor Control [Full Auto Air Conditioner]
Purpose
-
The A/C compressor control switches the A/C compressor on/off according to the vehicle environment.
Function
-
The A/C compressor control turns the A/C compressor on/off based on the climate control unit operation and signals from each sensor.
-
The A/C compressor control has automatic and manual controls.
-
The A/C compressor automatic control performs the following correction:
-
Defroster correction
A/C compressor automatic control
-
The climate control unit determines the A/C ON/OFF mode based on the ambient temperature.
-
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).
-
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.
-
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.
-
The ambient temperature calculation value is calculated based on the ambient temperature, set temperature, cabin temperature, and sunlight intensity.
-
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
-
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
-
Defroster correction
-
When the defroster switch is turned on, the system is switched to A/C ON mode to improve defogging.
Construction
-
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:
Main Relay [Skyactiv G 2.0]
Purpose/Function
Supplies power to each part.
Supplies battery voltage to each part based on the signals from the PCM even
though the ignition is switched on or off.
Construction
Installed to the relay and fuse block.
Operation
After the contact poin ...
Condenser Inspection
1. Inspect the condenser for cracks, damage, and oil leakage.
If there is any malfunction, replace the condenser.
2. Visually inspect for bent fins for clogging of foreign material.
If any fins are clogged, remove the foreign material.
3. Visually inspect for bent fins.
...
Magnet Clutch [Manual Air Conditioner]
Purpose
The magnetic clutch transmits the rotation force from the engine to the shaft
in the A/C compressor.
Function
The magnetic clutch engages or disengages the magnetic clutch and the A/C
turns on or off by switching the power transmission from the engine.
Con ...