Nissan Leaf. Instruction — 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
.
>> GO TO 7.
5.
OPERATION CHECK
Perform the operation check. Refer to
.
>> GO TO 6.
6.
SYMPTOM DIAGNOSIS
Check the symptom diagnosis table. Refer to
.
>> 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
.
Does it operate normally?
YES
>> Inspection End.
NO
>> GO TO 2.
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