Nissan X-Trail 32. Manual - part 1418

COMPONENT PARTS

HAC-147

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

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A/C UNIT ASSEMBLY : PTC Heater

INFOID:0000000010939809

• 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:0000000010939810

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:0000000010939811

• 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.

JMIIA2397ZZ

JMIIA1767GB

JMIIA3566GB

HAC-148

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

COMPONENT PARTS

A/C Control (A/C Amp.)

INFOID:0000000010939812

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:0000000010939813

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:0000000010939814

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.

JMIIA3575ZZ

JMIIA1719GB

PBIB2657E

SYSTEM

HAC-149

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

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SYSTEM

MANUAL AIR CONDITIONING SYSTEM

MANUAL AIR CONDITIONING SYSTEM : System Description

INFOID:0000000010939815

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-150, "MANUAL AIR CONDITIONING SYSTEM : Air Inlet Control"

•

HAC-150, "MANUAL AIR CONDITIONING SYSTEM : Compressor Control"

•

HAC-151, "MANUAL AIR CONDITIONING SYSTEM : Door Control"

•

HAC-153, "MANUAL AIR CONDITIONING SYSTEM : Cooling Fan Control"

•

HAC-154, "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

JMIIA3576GB

HAC-150

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

SYSTEM

sensor is used when engine coolant temperature is low [less than approximately 56

°

C (133

°

F)]. The mem-

ory data (before the ignition switch is OFF) when the engine is warmed up [approximately 56

°

C (133

°

F) or

more]. 

- The correction of the ambient temperature is not performed when the detection temperature of the ambient

temperature is less than approximately 

−

20

°

C (–4

°

F). 

Intake temperature correction

- A/C amp. inputs the temperature detected by intake sensor as the intake temperature (evaporator tempera-

ture).

- A/C amp. performs the correction of the temperature detected by intake sensor for air conditioning control. 
- A/C amp. performs the correction so that the recognition intake temperature changes depending on the dif-

ference between the detected intake temperature and the recognition intake temperature. If the difference is
large, the changing is early. The changing becomes slow as the difference becomes small. 

CONTROL BY ECM

HAC-150, "MANUAL AIR CONDITIONING SYSTEM : Compressor Control"

CONTROL BY IPDM E/R

HAC-150, "MANUAL AIR CONDITIONING SYSTEM : Compressor Control"

MANUAL AIR CONDITIONING SYSTEM : Air Inlet Control

INFOID:0000000010939816

DESCRIPTION

• A/C amp. controls the intake door motor and switches the air inlets.
• A/C amp. controls the air inlets so that they are set to fresh air intake, when compressor is stopped by low

temperature protection control.

• When the following conditions are met, A/C amp. controls the air inlets to 20% recirculation. (However, this

does not occur when high water temperature control is in effect.)
At this time, the intake switch indicator lamp turns OFF.

- Fan control dial: 21st - 24th
- Temperature control dial: Full hot
- Air outlet mode: DF ON or DEF ON

HIGH ENGINE COOLANT TEMPERATURE CONTROL

When either of the following conditions is met, A/C amp. changes the air inlets to recirculation.

Condition 1

• Air outlet: Other than D/F or DEF
• A/C switch: ON
• Ambient temperature: More than 25

°

C (77

°

F)

• Vehicle speed: 30 km/h or more
• Engine coolant temperature: 105

°

C (221

°

F) or more

Condition 2

• Air outlet: D/F or DEF
• Air inlet: Fresh air intake
• A/C switch: ON
• Ambient temperature: More than 25

°

C (77

°

F)

• Vehicle speed: 30 km/h or more
• Engine coolant temperature: 105

°

C (221

°

F) or more

MANUAL AIR CONDITIONING SYSTEM : Compressor Control

INFOID:0000000010939817

DESCRIPTION

• When the compressor activation condition is satisfied while blower motor is activated, A/C amp. transmits A/

C ON signal and blower fan ON signal to ECM.

• ECM judges the conditions of each sensor (Refrigerant pressure sensor signal, accelerator position signal,

etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line.

• By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and acti-

vates the compressor. Refer to 

PCS-7, "RELAY CONTROL SYSTEM : System Description"

.

CONTROL BY A/C AMP.

Low Temperature Protection Control