Nissan X-Trail 32. Manual - part 1339

COMPONENT PARTS

HA-15

< SYSTEM DESCRIPTION >

[R9M (EXCEPT FOR RUSSIA)]

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SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

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JMIIA3677ZZ

In the heater & cooling unit assembly

No.

Location

Function

Compressor

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

Refrigerant pressure sensor

• AUTOMATIC AIR CONDITIONING: Refer to 

HAC-19, "Refrigerant Pressure Sensor"

.

• MANUAL AIR CONDITIONING: Refer to 

HAC-148, "Refrigerant Pressure Sensor"

.

Condenser (condenser & Liq-
uid tank)

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

Liquid tank (condenser & Liq-
uid tank)

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

Expansion valve

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

Evaporator

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

HA-16

< SYSTEM DESCRIPTION >

[R9M (EXCEPT FOR RUSSIA)]

SYSTEM

SYSTEM

System Diagram

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System Description

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REFRIGERANT CYCLE

Refrigerant Flow

The refrigerant from the compressor, flows the condenser with liquid tank, the evaporator, and returns to the
compressor. The refrigerant evaporation in the evaporator is controlled by an expansion valve.

Freeze Protection

When intake sensor detects that evaporator surface temperature is 2

°

C (36

°

F) or less, A/C auto amp. (Auto-

matic air conditioning) or A/C amp. (Manual air conditioning) requests ECM to turn the compressor OFF, and
ECM makes A/C relay to 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

sensor, installed at the high-pressure pipe 1. 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 to OFF and stops the compressor when the high-pressure side detected by refriger-

ant pressure sensor is following conditions;

- Approximately 3,120 kPa (31.2 bar, 31.8 kg/cm

2

, 452 psi) or more (Engine speed is less than 1,500 rpm.)

- Approximately 2,740 kPa (27.4 bar, 27.9 kg/cm

2

, 397 psi) or more (Engine speed is 1,500 rpm or more.)

- Approximately 140 kPa (1.4 bar, 1.4 kg/cm

2

, 20 psi) or less

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 refrigerant in the system increases to an unusual level [more than 3,800 kPa (38 bar,
38.8 kg/cm

2

, 551 psi)].

JMIIA3115GB

DIAGNOSIS AND REPAIR WORKFLOW

HA-17

< BASIC INSPECTION >

[R9M (EXCEPT FOR RUSSIA)]

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

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OVERALL SEQUENCE

DETAILED FLOW

1.

INTERVIEW FOR MALFUNCTION

Interview the symptom to the customer.

NNIIA0143GB

HA-18

< BASIC INSPECTION >

[R9M (EXCEPT FOR RUSSIA)]

DIAGNOSIS AND REPAIR WORKFLOW

>> GO TO 2.

2.

SYMPTOM CHECK

Check the symptom from the customer's information. Check that any symptom occurs other than the inter-
viewed symptom.

Insufficient cooling/heating>>GO TO 3.
Refrigerant leakage>>GO TO 6.
Noise >> GO TO 7.

3.

CONTROL SYSTEM DIAGNOSIS

Perform the system diagnosis for the A/C control system. Refer to 

HAC-69, "Work Flow"

 (AUTOMATIC AIR

CONDITIONING SYSTEM) or 

HAC-183, "Work Flow"

 (MANUAL AIR CONDITIONING SYSTEM).

Is A/C control system normal?

YES

>> GO TO 4.

NO

>> GO TO 8.

4.

PERFORMANCE TEST

Perform the performance test. Check the operation of each part. Refer to 

HA-25, "Inspection"

.

>> GO TO 5.

5.

TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE

Diagnose using a manifold gauge whenever system's high and/or low side pressure(s) is/are unusual. Specify
the malfunctioning part. Refer to 

HA-27, "Symptom Table"

.

Low refrigerant charge>>GO TO 6.
Except above>>GO TO 8.

6.

CHECK REFRIGERANT FOR LEAKAGES

Check refrigerant for leakages. Specify the malfunctioning part. Refer to 

HA-19, "Leak Test"

.

>> GO TO 8.

7.

TROUBLE DIAGNOSIS FOR NOISE

Perform trouble diagnosis for noise. Specify the malfunctioning part. Refer to 

HA-29, "Symptom Table"

.

>> GO TO 8.

8.

MALFUNCTION PART REPAIR

Repair or replace the malfunctioning part.

>> GO TO 9.

9.

REPAIR CHECK (OPERATION CHECK)

Check the operation of each part.

Does it operate normally?

YES

>> INSPECTION END

NO

>> GO TO 2.