Nissan Murano. Manual - part 792

HA-4

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORK FLOW

>> GO TO 3.

3.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III

Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC. Refer to 

HAC-106, "DTC Index"

 (WITH-

OUT 7 INCH DISPLAY) or 

HAC-230, "DTC Index"

 (WITH 7 INCH DISPLAY).

Are self-diagnosis results normal?

YES

>> GO TO 4.

NO

>> GO TO 5.

4.

NARROW DOWN THE MALFUNCTIONING PARTS BY SYMPTOM DIAGNOSIS

Perform symptom diagnosis and narrow down the malfunctioning parts. Refer to 

HAC-108, "Diagnosis Chart

By Symptom"

 (WITHOUT 7 INCH DISPLAY) or 

HAC-232, "Diagnosis Chart By Symptom"

 (WITH 7 INCH DIS-

PLAY).

>> GO TO 5.

5.

REPAIR OR REPLACE

Repair or replace malfunctioning parts.
NOTE:
If DTC is displayed, erase DTC after repairing or replacing malfunctioning parts.

>> GO TO 6.

6.

FINAL CHECK

Check that the A/C system operates normally.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 3.

REFRIGERATION SYSTEM

HA-5

< SYSTEM DESCRIPTION >

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SYSTEM DESCRIPTION

REFRIGERATION SYSTEM

System Diagram

INFOID:0000000009718609

System Description

INFOID:0000000009718610

REFRIGERANT CYCLE

Refrigerant Flow

The refrigerant flows from the compressor, through the condenser with a liquid tank, through the evaporator,
and then back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally
equalized expansion valve, located at dash panels.

Freeze Protection

To prevent the evaporator from freezing up, the evaporator air temperature is monitored, and the voltage sig-
nal to the A/C auto amp. turns the A/C relay OFF and stops the compressor.

REFRIGERANT SYSTEM PROTECTION

Refrigerant Pressure Sensor

The refrigerant system is protected against excessively high or low-pressures by the refrigerant pressure sen-
sor, located on the liquid tank. The refrigerant pressure sensor detects the pressure inside the refrigerant line
and sends the voltage signal to the ECM if the system pressure rises above, or falls below the specifications.
ECM turns the A/C relay OFF and stops the compressor when pressure on the high-pressure side detected by
the refrigerant pressure sensor is over approximately 3,119 kPa (31.8 kg/cm

2

, 452 psi) or below approximately

118 kPa (1.2 kg/cm

2

, 17 psi).

Pressure Relief Valve

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
The release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere
when the pressure of the refrigerant in the system increases to an unusual level [more than 3,600 kPa (36.7
kg/cm

2

, 522 psi)].

RJIA1552E

HA-6

< SYSTEM DESCRIPTION >

REFRIGERATION SYSTEM

Component Parts Location

INFOID:0000000009718611

1.

Compressor

2.

Condenser

3.

Liquid tank

4.

Refrigerant pressure sensor

JPIIA0550ZZ

REFRIGERATION SYSTEM

HA-7

< SYSTEM DESCRIPTION >

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Component Description

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1.

Evaporator

2.

Expansion valve

3.

Blower motor

JPIIA0551ZZ

Component

Description

Compressor

Intakes, compresses, and discharges refrigerant, to circulate refrigerant inside the refrigerant cycle.

Condenser

Cools refrigerant discharged from compressor, and transforms it to liquid refrigerant.

Liquid tank

Eliminates foreign material in refrigerant, and temporarily stores liquid refrigerant.

Refrigerant pressure sensor

Refer to 

HAC-74, "Description"

 (WITHOUT 7 INCH DISPLAY) or 

HAC-200, "Description"

 (WITH 7 

INCH DISPLAY).

Evaporator

The mist form liquid refrigerant transforms to gas through evaporation by the air conveyed from the 
blower motor. The air is cooled by the heat from evaporation.

Expansion valve

Transforms high-pressure liquid refrigerant to mist form from low-pressure liquid refrigerant by the 
drawing function.

Blower motor

Takes in air from the vehicle or fresh outside air, provides it forcedly pushes it into to the air condi-
tioner, and circulates it inside the vehicle.