Nissan X-Trail 32. Manual — part 1373
COMPONENT PARTS
HA-151
< SYSTEM DESCRIPTION >
[R9M (FOR RUSSIA)]
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000011006153
JMIIA3357ZZ
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-152
< SYSTEM DESCRIPTION >
[R9M (FOR RUSSIA)]
SYSTEM
SYSTEM
System Diagram
INFOID:0000000011006154
System Description
INFOID:0000000011006155
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
To prevent evaporator from freezing up, the evaporator air temperature is monitored, and the voltage signal to
the A/C auto amp. makes the A/C relay go OFF and stop the compressor.
REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor
• The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure
sensor, located on the condenser. 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 specifica-
tions.
• 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 1,500 rpm or more.)
- Approximately 2,740 kPa (27.4 bar, 27.9 kg/cm
2
, 397 psi) or more (Engine speed is less than 1,500 rpm.)
- Approximately 140 kPa (1.4 bar, 1.2 kg/cm
2
, 17 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 (38.0 bar,
38.8 kg/cm
2
, 551 psi)].
JPIIA1671GB
DIAGNOSIS AND REPAIR WORKFLOW
HA-153
< BASIC INSPECTION >
[R9M (FOR RUSSIA)]
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
INFOID:0000000011006156
OVERALL SEQUENCE
DETAILED FLOW
1.
INTERVIEW FOR MALFUNCTION
Interview the symptom to the customer.
NNIIA0143GB
HA-154
< BASIC INSPECTION >
[R9M (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
(AUTOMATOC AIR
CONDITIONING),
(MANUAL AIR CONDITIONING).
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
.
>> 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
.
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
.
>> GO TO 8.
7.
TROUBLE DIAGNOSIS FOR NOISE
Perform trouble diagnosis for noise. Specify the malfunctioning part. Refer to
.
>> 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.
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