Infiniti EX35. Manual — part 886
DIAGNOSIS AND REPAIR WORKFLOW
HA-3
< BASIC INSPECTION >
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
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DETAILED FLOW
1.
LISTEN TO CUSTOMER COMPLAINT
Listen to customer complaint. (Get detailed information about the conditions and environment when the symp-
tom occurs.)
>> GO TO 2.
2.
VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to
HAC-6, "WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL SYSTEM : Description & Inspection"
(Without left and right venti-
lation temperature separately control system) or
HAC-11, "WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM : Description & Inspection"
(With left and right ventilation
temperature separately control system).
>> GO TO 3.
3.
GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis (Refer to
HAC-132, "Diagnosis Chart By Symptom"
>> GO TO 4.
4.
REPAIR OR REPLACE
Repair or replace the specific parts.
>> GO TO 5.
5.
FINAL CHECK
Final check.
Is the inspection result normal?
YES
>> CHECK OUT
NO
>> GO TO 3.
HA-4
< FUNCTION DIAGNOSIS >
REFRIGERATION SYSTEM
FUNCTION DIAGNOSIS
REFRIGERATION SYSTEM
System Diagram
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System Description
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REFRIGERANT CYCLE
Refrigerant Flow
The refrigerant flows from the compressor, through the condenser with liquid tank, through the evaporator, and
back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally equalized
expansion valve, located inside the evaporator case.
Freeze Protection
To prevent evaporator from freezing up, the evaporator air temperature is monitored, and the voltage signal to
the unified meter and A/C 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 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 makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by 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 refrigerant in the system increases to an unusual level [more than 3,628 kPa (37 kg/cm
2
,
526 psi)].
RJIA1552E
REFRIGERATION SYSTEM
HA-5
< FUNCTION DIAGNOSIS >
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Component Parts Location
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1.
Refrigerant pressure sensor
2.
Liquid tank
3.
Condenser
4.
Compressor
JPIIA0713ZZ
HA-6
< FUNCTION DIAGNOSIS >
REFRIGERATION SYSTEM
Component Description
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1.
Expansion valve
2.
Evaporator
3.
Blower motor
JPIIA0714ZZ
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 matter in refrigerant, and stores temporarily liquid refrigerant.
Refrigerant pressure sensor
Refer to
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.
Blower motor
Takes in air in the vehicle or fresh outside air, provides it forcedly to the air conditioner, and conveys
it inside the vehicle.
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