Nissan Sentra Service Manual: System description
Refrigeration system
Component part location
- High-pressure service port
- High-pressure pipe
- Expansion valve
- Low-pressure service port
- Low-pressure flexible hose
- Compressor
- Refrigerant pressure sensor
- Condenser and liquid tank assembly
- High-pressure flexible hose
Refrigerant cycle
Refrigerant flow
- Electric compressor
- Pressure relief valve
- Liquid tank
- Refrigerant pressure sensor
- Condenser
- Expansion valve
- Evaporator
- Blower motor
- High-pressure gas
- High-pressure liquid
- Low-pressure liquid
- Low-pressure gas
- Suction port
- Discharge port
- Outside air
Refrigerant Flow
The refrigerant from the compressor flows through the condenser and 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 the evaporator from freezing up, the evaporator air temperature is monitored by the intake sensor 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 liquid tank. If the system pressure rises above or falls below the specifications, the refrigerant 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/cm2, 398 psi), or below approximately 120 kPa (1.22 kg/cm2, 17.4 psi).
Pressure Relief Valve
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/ cm2, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere.
Preparation
Special service tool
The actual shape of the tools may differ from those illustrated here.
HFC-134a (r-134a) service tool and equipmen.T.
Do not mix HFC-134a (R-134a) refrigerant and/or its s ...
Basic inspection
Diagnosis and repair workflow
Workflow
OVERALL SEQUENCE
DETAILED FLOW
1.INTERVIEW CUSTOMER
Interview the customer to obtain as much information as possible about the
conditions and environm ...
Other materials:
P2122, P2123 APP Sensor
DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC P2122 or P2123 is displayed with DTC P0643, first perform the
trouble diagnosis for DTC P0643.
Refer to EC-353, "DTC Logic".
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible caus ...
Unbalance steering wheel turning force and return between right
and left
Description
Unbalance steering wheel turning force and return between right
and left.
Diagnosis Procedure
1.CHECK THE ILLUMINATION OF THE EPS WARNING LAMP
Check the EPS warning lamp while engine is running.
Does the EPS warning lamp turn OFF?
YES >> GO TO 2.
NO >> Refer to S ...
Moonroof motor assembly
Exploded view
Headlining
Sun visor
Moonroof motor assembly
Front
Removal and installation
REMOVAL
Close the glass lid.
Remove the map lamp. Refer to INL-52, "Removal and Installation".
Remove the moonroof motor bolts (A).
Front
Disconnect the harness connec ...
