Nissan Altima 2007-2012 Service Manual: Refrigeration system
Refrigerant Cycle
Refrigerant flow
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank, through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is controlled by an externally equalized expansion valve, located inside the evaporator case.
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 condenser. 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.
Function information
Component Part Location ENGINE COMPARTMENT 1. A/C compressor F3 2. Ambient sensor E211 3. Refrigerant pressure sensor E219 4. A/C relay (internal to IPDM E/R) 1. A/C compressor F3 2. Ambie ...Automatic air conditioner system
System Diagram CONTROL SYSTEM The control system consists of input sensors, switches, front air control and outputs. The relationship of these components is shown in the figure below: System ...Other materials:
Headlamp (xenon)
Description
The IPDM E/R (intelligent power distribution module engine room) controls the
headlamp low relay based on
inputs from the BCM over the CAN communication lines. When the headlamp low
relay is energized, power
flows through fuses 51 and 52, located in the IPDM E/R. Power then ...
Daytime running light system
System Diagram
System Description
The headlamp system for Canada vehicles is equipped with a daytime light
control unit that activates the high
beam headlamps at approximately half illumination whenever the engine is
running. If the parking brake is
applied before the engine is started the ...
Basic inspection
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
OVERALL SEQUENCE
DETAILED FLOW
1. GET INFORMATION FOR SYMPTOM
Get the detailed information from the customer about the symptom (the
condition and the environment when
the incident/malfunction occurred).
>> GO TO 2
2. CHECK DTC
1. Check DTC ...