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Nissan Quest E52. Manual - part 721

HAC-14

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

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

Exhaust Gas/Outside Odor Detecting Sensor

INFOID:0000000009652507

DESCRIPTION

Exhaust gas/outside odor detecting sensor detects ambient atmo-
spheric CO, NO

and unpleasant odor, and converts them to values

of resistance. The values are converted to signals with the exhaust
gas/outside odor detecting sensor internal circuit, then the A/C auto
amp. inputs the signals.

STRUCTURE AND OPERATION

Exhaust gas/outside odor detecting sensor has a construction that
detects CO, NO

and unpleasant odor by exhaust gas/outside odor

detecting sensor element from the air intake of the case through a fil-
ter (waterproof sheet). It sends output signals to the A/C auto amp.
in response to a resistance value conversion by exhaust gas/outside
odor detecting sensor elements. A/C auto amp. controls intake door
motor to prevent a smell of exhaust gas and unpleasant ambient
odor from getting into the vehicle by performing corrections accord-
ing to various driving conditions.

Magnet Clutch

INFOID:0000000009652508

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 pressed it to pulley.

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

supplied to field coil, clutch disc is pressed 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.

JMIIA1768ZZ

JMIIA1769GB

JMIIA1767GB

COMPONENT PARTS

HAC-15

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

Ionizer

INFOID:0000000009652509

High density plasmacluster

™

ion generator is adopted to increase

the effect in maintaining skin moisture as well as the effect against
mold, viruses, allergens, and odors.
NOTE:
• Plasmacluster

™

ion technology developed by Sharp Corporation is

installed in this item.

• Plasmacluster

™

is a trademark of Sharp Corporation.

JMIIA1770ZZ

HAC-16

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

SYSTEM

FRONT AUTOMATIC AIR CONDITIONING SYSTEM

FRONT AUTOMATIC AIR CONDITIONING SYSTEM : System Description

INFOID:0000000009652510

SYSTEM DIAGRAM

DESCRIPTION

• Front automatic air conditioning system is controlled by each function of A/C auto amp., BCM, ECM and

IPDM E/R.

• Each operation of front air conditioning system can be controlled by front A/C control (built-in A/C auto

amp.).

CONTROL BY A/C AUTO AMP.

•

HAC-17, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Temperature Control"

•

HAC-18, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Air Outlet Control"

•

HAC-18, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Air Flow Control"

•

HAC-19, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Air Inlet Control"

•

HAC-19, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control"

•

HAC-20, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Door Control"

• Correction for input value

Ambient temperature correction

- A/C auto amp. inputs the temperature detected by ambient sensor as the ambient temperature.
- A/C auto amp. performs the correction of the temperature detected by ambient sensor for front air condition-

ing control.

- A/C auto amp. selects and uses the initial value of ambient temperature data depending on the engine cool-

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

JMIIA1771GB

SYSTEM

HAC-17

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

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

temperature is less than approximately

−

C (–4

F).

Front in-vehicle temperature correction

- A/C auto amp. inputs the temperature detected by front in-vehicle sensor as the front in-vehicle temperature.
- A/C auto amp. performs the correction of the temperature detected by front in-vehicle sensor for front air

conditioning control.

- A/C auto amp. performs the correction so that the recognition passenger room temperature (front side)

changes depending on the difference between the detected passenger room temperature (front side) and
the recognition passenger room temperature (front side). If the difference is large, the changing is early. The
changing becomes slow as the difference becomes small.

Intake temperature correction

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

temperature).

- A/C auto amp. performs the correction of the temperature detected by intake sensor for front air conditioning

control.

- A/C auto amp. performs the correction so that the recognition intake temperature changes depending on the

difference 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.

Sunload amount correction

- A/C auto amp. inputs the sunload amount detected by sunload sensor.
- A/C auto amp. performs the correction of the sunload amount detected by sunload sensor for front air condi-

tioning control.

- When the sunload amount suddenly changes, for example when entering a tunnel, perform the correction so

that the recognition sunload amount of the A/C auto amp. changes slowly.

Set temperature correction

- A/C auto amp. performs the correction to the target temperature set by the temperature control switch so as

to match the temperature felt by the passengers depending on the ambient temperature detected by ambi-
ent sensor and controls it so that the in-vehicle temperature is always the most suitable.

CONTROL BY BCM

•

HAC-19, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control"

CONTROL BY ECM

•

HAC-19, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control"

• Cooling fan control. Refer to

EC-45, "COOLING FAN CONTROL : System Description"

CONTROL BY IPDM E/R

•

HAC-19, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control"

• Cooling fan control. Refer to