Nissan Maxima. Manual - part 697

HA-14

< SYSTEM DESCRIPTION >

REFRIGERATION SYSTEM

SYSTEM DESCRIPTION

REFRIGERATION SYSTEM

Refrigerant Cycle

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Refrigerant flow

The refrigerant from the compressor flows through the condenser with liquid tank, the evaporator and returns

to the compressor. The refrigerant evaporation in the evaporator is controlled by an expansion valve.

1.

Compressor

2.

Pressure relief valve

3.

Liquid tank

4.

Refrigerant pressure sensor

5.

Condenser

6.

Expansion valve

7.

Evaporator

8.

Blower motor

A.

High-pressure gas

B.

High-pressure liquid

C.

Low-pressure liquid

D.

Low-pressure gas

E.

Suction port

F.

Discharge port

G

Outside air

AWIIA0054ZZ

REFRIGERATION SYSTEM

HA-15

< SYSTEM DESCRIPTION >

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Component Part Location

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Refrigerant System Protection

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Refrigerant pressure sensor

The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen-

sor, located on the condenser. If the system pressure rises above or falls below the specifications, the refriger-

ant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.

The ECM then ceases to supply power to the A/C relay which disengages and stops the compressor when

pressure on the high pressure side (as detected by refrigerant pressure sensor) is over approximately 2,746
kPa (28 kg/cm

2

, 398 psi), or below approximately 120 kPa (1.22 kg/cm

2

, 17.4 psi).

Pressure Relief Valve

1.

Heater and cooling unit assembly

2.

High-pressure pipe

3.

High-pressure A/C service valve

4.

High-pressure flexible hose

5.

Air deflector (RH)

6.

Junction pipe

7.

Condenser

8.

Liquid tank

9.

Refrigerant pressure sensor

10. Condenser, liquid tank and refrig-

erant pressure sensor

11. Air deflector (LH) 

12. Compressor

13. Low-pressure flexible hose

14. Low-pressure A/C service valve

15. Low-pressure pipe

A.

High-pressure pipe to heater and 
cooling unit assembly

B.

High-pressure flexible hose to com-
pressor

C.

Low-pressure flexible hose to com-
pressor

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HA-16

< SYSTEM DESCRIPTION >

REFRIGERATION SYSTEM

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.

When the pressure of refrigerant in the system increases to an abnormal level [more than 3,727 kPa (38 kg/
cm

2

, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into

the atmosphere.

DIAGNOSIS AND REPAIR WORK FLOW

HA-17

< BASIC INSPECTION >

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

WITH COLOR DISPLAY
WITH COLOR DISPLAY : How to Perform Trouble Diagnosis For Quick And Accurate 
Repair

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WORK FLOW

1.

LISTEN TO CUSTOMER COMPLAINT

Interview the customer to obtain as much information as possible about the conditions and environment under

which the symptom occurs.

>> GO TO 2.

2.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 3.

3.

CHECK FOR HVAC DTCS WITH CONSULT

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

HAC-65, "DTC Index"

.

Are there any HVAC DTCs present?

YES

>> Go to HVAC DTC index. Refer to 

HAC-65, "DTC Index"

.

NO

>> GO TO 4.

4.

CHECK FOR AUDIO DTCS WITH CONSULT

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

AV-437, "DTC Index"

 (with-

out navigation) or 

AV-607, "DTC Index"

 (with navigation).

Are there any audio DTCs present?

YES

>> Go to audio DTC index. Refer to 

HAC-65, "DTC Index"

.

NO

>> GO TO 5.

5.

PERFORM OPERATIONAL CHECK

Verify the symptom with operational check based on the information obtained from the customer. Refer to

HAC-5, "Operational Check"

.

>> GO TO 6.

6.

GO TO APPROPRIATE TROUBLE DIAGNOSIS

Go to appropriate trouble diagnosis. Refer to 

HA-21, "WITH COLOR DISPLAY : Symptom Matrix Chart"

.

NOTE:

If DTC is displayed, erase DTC after repairing or replacing malfunctioning parts.
Is the inspection result normal?

YES

>> Repair or replace malfunctioning parts.

NO

>> GO TO 7.

7.

FINAL CHECK

Check that the A/C system operates normally.
Is the inspection result normal?

YES

>> Inspection End

NO

>> GO TO 3.

WITH MONOCHROME DISPLAY
WITH MONOCHROME DISPLAY : How to Perform Trouble Diagnosis For Quick And