Nissan Leaf. Manual - part 725

HA-22

< SYSTEM DESCRIPTION >

[WITH HEAT PUMP SYSTEM]

SYSTEM

• The refrigerant pressure sensor outputs a signal to the VCM.

• If the A/C auto amp., judges that there is a malfunction (the conditions shown below) in the cooler cycle

based on the refrigerant pressure sensor detection value sent from VCM via EV CAN communications, it

stops operation of the electric compressor.

- Approximately 2,650 kPa (26.5 bar, 27.0 kg/cm

2

, 384.3 psi) or more

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

2

, 20.3 psi) or less

NOTE:

The values indicate gauge pressure.

Pressure Relief Valve

• The refrigerant system is protected from significant high pressure by the pressure relief valve that is installed

in the electric compressor.

• If the pressure in the cooler cycle is excessively increased [3,500 kPa (35 bar, 35.7 kg/cm

2

, 507.5 psi) -

4,140 kPa (41.4 bar, 42.2 kg/cm

2

, 600.3 psi) or more], the pressure relief valve opens, releasing refrigerant

into the atmosphere.

HEATING SYSTEM
HEATING SYSTEM : System Diagram

INFOID:0000000010122100

HEATING SYSTEM : System Description

INFOID:0000000010122101

HEATING CYCLE

JMIIA2686ZZ

1.

2-way valve

2.

Orifice tube (Inner condenser)

3.

Condenser

4.

3-way valve

5.

Orifice tube (Evaporator)

6.

PTC heater

7.

Evaporator

8.

Accumulator

9.

Pressure relief valve

10. Electric compressor

11. Inner condenser

12. Pressure sensor

13. High-pressure gas

14. High-pressure liquid

15. Low-pressure liquid

16. Low-pressure gas

SYSTEM

HA-23

< SYSTEM DESCRIPTION >

[WITH HEAT PUMP SYSTEM]

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Refrigerant Flow

• The basic path of refrigerant flow is through the electric compressor, inner condenser, condenser then it

returns to the electric compressor.

• The refrigerant is heated as it is compressed by the electric compressor. The condensing of refrigerant

inside the inner condenser provides interior heat.

• The electric PTC heater provides supplemental interior heat.

HA-24

< BASIC INSPECTION >

[WITH HEAT PUMP SYSTEM]

DIAGNOSIS AND REPAIR WORK FLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Workflow

INFOID:0000000010122102

OVERALL SEQUENCE

DETAILED FLOW

1.

INTERVIEW CUSTOMER

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

which the malfunction occurred.

ALIIA0440GB

DIAGNOSIS AND REPAIR WORK FLOW

HA-25

< BASIC INSPECTION >

[WITH HEAT PUMP SYSTEM]

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>> GO TO 2.

2.

SYMPTOM CHECK

Verify symptoms.

>> GO TO 3.

3.

CHECK FOR DTCS

With CONSULT

1. Turn ignition switch ON.

2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.

3. Check DTC.
Is any DTC detected?

YES

>> GO TO 4.

NO

>> GO TO 5.

4.

PERFORM DTC DIAGNOSTIC PROCEDURE

Perform the diagnostic procedure for the detected DTC. Refer to 

HAC-56, "DTC Index"

.

>> GO TO 7.

5.

OPERATION CHECK

Perform the operation check. Refer to 

HAC-78, "Work Procedure"

.

>> GO TO 6.

6.

SYMPTOM DIAGNOSIS

Check the symptom diagnosis table. Refer to 

HAC-183, "Symptom Table"

.

>> GO TO 8.

7.

VERIFY REPAIR.

With CONSULT

1. Turn ignition switch ON.

2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.

3. Check DTC.
Is any DTC detected?

YES

>> GO TO 4.

NO

>> GO TO 8.

8.

PERFORM FINAL OPERATION CHECK

Perform the operation check. Refer to 

HAC-78, "Work Procedure"

.

Does it operate normally?

YES

>> Inspection End.

NO

>> GO TO 2.