Mazda CX-5 Service & Repair Manual: Air Intake Control [Full Auto Air Conditioner]
Purpose
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The air intake control switches the air intake port (FRESH/REC) according to the vehicle environment.
Function
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The air intake control drives the air intake actuator and switches the air intake door position according to the operations of the REC, FRESH and defroster switches and the vehicle environment.
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The air intake control has automatic and manual controls.
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The air intake automatic control performs the following correction:
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Defroster correction
-
Ambient temperature correction
Air intake automatic control
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The climate control unit performs the control as follows so that the cabin temperature lowers quickly according to the cooling conditions.
1. Calculates the cabin temperature value based on the ambient temperature and sunlight intensity.
2. Compares the calculated cabin temperature value and current cabin temperature.
3. Determines the air intake mode.
Air intake manual control
-
The climate control unit switches the air intake mode based on the REC/FRESH switch operation.
|
Air intake mode |
REC switch operation |
|
FRESH |
Fixed to FRESH when the FRESH switch is turned on during REC mode |
|
REC |
Fixed to REC when the RECIRCULATE switch is turned on during FRESH mode |
REC mode control under severe heat
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When the vehicle is driven at a very low speed with the A/C on under a severe heat condition, the climate control unit may change the air intake mode from FRESH to REC automatically.
-
Due to this, load to the A/C compressor is reduced.
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When the air intake mode is switched to REC, the indicator on the REC switch illuminates.
Correction
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Defroster correction
-
The defroster correction improves the effect of defrosting.
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The air intake is fixed at FRESH when the defroster switch is turned on.
-
The air intake is fixed at FRESH even if it has been set to REC manually.
-
Ambient temperature correction
-
When the ambient temperature is 15 °C {59 °F}
or less, the air intake is fixed at FRESH to prevent window fogging.
Construction
-
The air intake control consists of the parts indicated in the following table:
|
Input device |
Control part |
Output device |
|
|
|
Operation
1. The climate control determines the air intake mode based on the operations of the REC, FRESH, defroster switches and signals from each sensor which changes according to the vehicle environment.
2. The climate control unit drives the air intake actuator according to the result of the air intake mode determination and corrections.
Air Intake Actuator [Manual Air Conditioner]
Purpose
The air intake actuator moves the air intake door in the blower unit to switch
the air intake port.
Function
The air intake actuator drives the motor based on the signal ...
Intake Air System Removal/Installation
WARNING:
A hot engine and intake air system can cause severe burns. Turn off the engine
and wait until they are cool before removing the intake air system.
1. Disconnect the negative ...
Other materials:
Differential Oil Temperature Sensor
Purpose, Function
The differential oil temperature sensor detects the rear differential oil
temperature based on the resistance of the thermistor, and inputs it to the
AWD CM.
Construction
The differential oil temperature sensor is installed in the rear differential
carr ...
Air Intake Actuator Inspection [Manual Air Conditioner]
1. Connect battery positive voltage to air intake actuator terminal B (or C),
connect terminal C (or B) to ground, and then verify that the air intake actuator
operates as shown in the table.
If the operation condition is not normal, replace the air intake actuator.
...
Hazard Warning Switch Inspection
1. Disconnect the negative battery cable..
2. Remove the decoration panel..
3. Verify that the continuity between the hazard warning switch terminals is
as indicated in the table.
If the continuity is as indicated in the table, go to the next step.
If not as indicated i ...
