Nissan Qashqai J11. Manual - part 1128

HAC-148

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

COMPONENT PARTS

• Direction of rotation is changeable by recomposing pattern of excitation.

A/C UNIT ASSEMBLY : Blower Motor

INFOID:0000000010432491

• Brush motor, that rotates coil while brush functions as contact

points, is adopted for blower motor.

• Rotation speed changes according to voltage from power transis-

tor.

A/C UNIT ASSEMBLY : Fan Control Amp.

INFOID:0000000010499376

• Fan control amp., that uses MOS field effect transistor, is adopted

for blower motor speed control.
NOTE:
MOS field effect transistor is a transistor for which the gate portion
is composed of a metal electrode on an oxide layer of semiconduc-
tor. Field effect transistor is controlled by voltage, while ordinary
transistor is controlled by current. Electrode of field effect transistor
is called source, drain, or gate, while electrode of ordinary transis-
tor is called emitter, collector, or base.

• Fan control amp. continuously controls voltage to blower motor,

according to gate voltage from A/C amp.

• This power transistor does not require a HI relay even when the

maximum voltage is applied to blower motor at HI status, because voltage drop is nominal.

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COMPONENT PARTS

HAC-149

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

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A/C UNIT ASSEMBLY : PTC Heater

INFOID:0000000010521000

• PTC heater is installed on passenger lower side of A/C unit assembly.
• Heat element is heated and air flow temperature is increased by

power supply from PTC relay.

COMPRESSOR

COMPRESSOR : Magnet Clutch

INFOID:0000000010503101

DESCRIPTION

Compressor is driven by the magnet clutch which is magnetized by electric power supply.

STRUCTURE AND OPERATION

• Magnet clutch consists of pulley, clutch disc, and field coil.
- Pulley is connected with crankshaft pulley of engine via drive belt

and is always rotated while engine is running.

- Clutch disc is connected with drive shaft of compressor.
- Field coil, which becomes a strong electric magnet when electricity

is supplied, strongly pulls clutch disc and presses it to pulley.

• When A/C relay integrated in IPDM E/R turns ON, electricity is

supplied to field coil, clutch disc is presses to pulley, and engine
rotational movement is transmitted from crankshaft pulley 

⇒

 drive

belt 

⇒

 pulley 

⇒

 clutch disc 

⇒

 drive shaft. Compressor is operated.

When A/C relay turns OFF, electricity is not supplied to field coil,
and clutch disc is released from pulley. Compressor is not oper-
ated.

COMPRESSOR : ECV (Electrical Control Valve)

INFOID:0000000010503102

• ECV (Electrical Control Valve) is integrated in the compressor.

IPDM E/R receives the ECV control signal from A/C amp. via CAN
communication, and ECV is controlled according to the control sig-
nal transmitted from IPDM E/R.

• ECV is controlled according to the control signal transmitted from

IPDM E/R.
The control signal transmitted by IPDM E/R is controlled according
to the ECV control signal transmitted from A/C amp. via CAN com-
munication.

• ECV varies the air pressure balance in the left and right air spaces

that are divided by the swash plate in order to change the angle of
the swash plate inside the compressor.
By changing the swash plate angle, it changes the piston stroke and controls the refrigerant discharge
amount.

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HAC-150

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

COMPONENT PARTS

A/C Control (A/C Amp.)

INFOID:0000000010499383

A/C control (A/C amp.) controls A/C by calculations based on signals
transmitted from each sensor and switch.
A/C control (A/C amp.) includes a self-diagnosis function. Diagnosis
of the manual air conditioning system can be performed quickly.

Ambient Sensor

INFOID:0000000010503107

Ambient sensor measures ambient air temperature. The sensor
uses a thermistor which is sensitive to the change in temperature.
The electrical resistance of the thermistor decreases as temperature
increases.

Refrigerant Pressure Sensor

INFOID:0000000010499385

DESCRIPTION

• The refrigerant pressure sensor converts high-pressure side refrigerant pressure into voltage and outputs it

to ECM.

• ECM operates cooler cycle protection and cooling fan speed control according to voltage value that is input.

STRUCTURE AND OPERATION

• The refrigerant pressure sensor is a capacitance type sensor. It consists of a pressure detection area and a

signal processing area.

• The pressure detection area, which is a variable capacity condenser, changes internal static capacitance

according to pressure force.

• The signal processing area detects the static capacitance of the pressure detection area, converts the static

capacitance into a voltage value, and transmits the voltage value to ECM.

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PBIB2657E

SYSTEM

HAC-151

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

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SYSTEM

MANUAL AIR CONDITIONING SYSTEM

MANUAL AIR CONDITIONING SYSTEM : System Description

INFOID:0000000010432501

SYSTEM DIAGRAM

DESCRIPTION

• Automatic air conditioning system is controlled by each function of A/C amp.,ECM and IPDM E/R.
• Each operation of air conditioning system can be controlled by A/C control (built-in A/C amp.).
• A/C control switch indicator is turned ON/OFF by air conditioning system operation condition.

CONTROL BY A/C AMP.

•

HAC-152, "MANUAL AIR CONDITIONING SYSTEM : Air Inlet Control"

•

HAC-152, "MANUAL AIR CONDITIONING SYSTEM : Compressor Control"

•

HAC-245, "MANUAL HEATER SYSTEM : Door Control"

•

HAC-157, "MANUAL AIR CONDITIONING SYSTEM : Cooling Fan Control"

•

HAC-158, "MANUAL AIR CONDITIONING SYSTEM : Door Motor Starting Position Reset Control"

• Correction for input value

Ambient temperature correction

- A/C amp. inputs the temperature detected by ambient sensor as the ambient temperature. 
- A/C amp. performs the correction of the temperature detected by ambient sensor for air conditioning control. 
- A/C amp. selects and uses the initial value of ambient temperature data depending on the engine coolant

temperature when turning the ignition switch from OFF to ON. The detection temperature of the ambient

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