Nissan Rogue Service Manual: System description

COMPONENT PARTS

Component Part Location

1. RH side of engine compartment
2. RH front of vehicle (view with front bumper fascia removed)

1. Left side of A/C unit
2.  Right side of A/C unit

SYSTEM

System Description

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

•  The manual air conditioning system is controlled by a sequence of functions from the front air control, BCM, ECM, and IPDM E/R.

Controlled by front air control:

•  HAC-119, "Air Flow Control"
•  HAC-119, "Air Inlet Control"
•  HAC-119, "Air Outlet Control"
•  HAC-119, "Compressor Control"
•  HAC-120, "Door Control"
•  HAC-123, "Temperature Control"

Controlled by BCM:

•  Air conditioning request signal.

  Refer to BCS-8, "BODY CONTROL SYSTEM : System Description" (with Intelligent Key system) or BCS-80, "BODY CONTROL SYSTEM : System Description" (without Intelligent Key system).

Control by ECM

•  Cooling fan control Refer to EC-46, "COOLING FAN CONTROL : System Description".
•  Air conditioning cut control Refer to EC-45, "AIR CONDITIONING CUT CONTROL : System Description".

Control by IPDM E/R

•  Relay control Refer to PCS-5, "RELAY CONTROL SYSTEM : System Description".
•  Cooling fan control Refer to EC-46, "COOLING FAN CONTROL : System Description".

Air Flow Control

DESCRIPTION

•  Front air control changes duty ratio of front blower motor control signal to control air flow continuously. When air flow is increased, duty ratio of front blower motor control signal gradually increases to prevent a sudden increase in air flow.
•  In addition to manual control, air flow control is composed of fan speed control at door motor operation.

FAN SPEED CONTROL AT DOOR MOTOR OPERATION

When mode door motor is activated while air flow is more than the specified value, front air control temporarily reduces fan speed so that mode door moves smoothly.

Air Inlet Control

The intake door position is automatically controlled in MAX A/C and DEF modes. The intake door is controlled by customer input in the other modes.

Air Outlet Control

Air outlet control is controlled by customer input. When the A/C is turned off by turning the blower control dial fully counterclockwise, the front air control retains the current selections and returns to these selections the next time the blower control dial is turned to any fan position.

NOTE: If ambient temperature is excessively low, D/F is selected to prevent windshield fogging when air outlet is set to FOOT.

Compressor Control

DESCRIPTION

In order for the IPDM E/R to complete a compressor ON request, the following conditions must be met:

1.  The BCM detects a Fan ON signal from the front air control. The front air control grounds the fan ON signal monitored by the BCM when the blower speed dial is in any of the fan speed positions.
2.  The BCM detects an A/C ON signal from the front air control. The front air control grounds the A/C ON signal monitored by the BCM when:

•  The A/C switch is pressed. The A/C switch LED illuminates and the front air control grounds the A/C ON signal monitored by the BCM. Any mode control button except D/F may be selected.
•  The A/C switch is OFF, and the MAX A/C button is pressed. The A/C switch LED will automatically illuminate and the front air control grounds the A/C ON signal monitored by the BCM.
•  The A/C switch is OFF, and the mode button for either D/F or DEF is selected. The front air control grounds the A/C ON signal monitored by the BCM, but it does not illuminate the A/C switch LED

NOTE: If the compressor was engaged by pressing the D/F or DEF mode buttons, and the time spent in either mode exceeds 1 minute, then the compressor stays requested, even when modes other than D/F or DEF are selected, until either:

1.  The ignition switch is turned OFF.
2.  The blower speed dial is turned completely counterclockwise to the OFF position.
3.  The A/C switch is manually turned OFF.

In other words, the compressor ON request cannot be turned off in D/F or DEF modes

REFRIGERANT PRESSURE PROTECTION

The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sensor, located on the liquid tank on the condenser. The refrigerant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM. If the system pressure rises above or falls below the following values, the ECM requests the IPDM E/R to de-energize the A/C relay and disengage the compressor.

•  3.12 MPa (31.82 kg/cm2, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
•  2.74 MPa (27.95 kg/cm2, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
•  0.14 MPa (1.43 kg/cm2, 20.3 psi) or less

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 2,990 kPa (30.5 kg/ cm2, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere.

COMPRESSOR OIL CIRCULATION CONTROL

When the engine starts while the engine coolant temperature is 56°C (133°F) or less, ECM activates the compressor for approximately 6 seconds and circulates the compressor lubricant once.

LOW TEMPERATURE PROTECTION CONTROL

•  When the intake sensor detects that the front evaporator fin temperature is 1.5°C (35°F) or less, the front air control requests the BCM to turn the compressor OFF, and stops the compressor.
•  When the front evaporator fin temperature returns to 5.0°C (41°F) or more, the compressor is activated.

OPERATING RATE CONTROL

When the set temperature is other than fully cold or the air outlet is “VENT”, “B/L” or “FOOT”, the front air control controls the compressor activation depending on ambient temperature.

Door Control

AIR MIX DOOR MOTOR

• DESCRIPTION The step motor system is adopted for air mix door motor.
•  When a drive signal is input from front air control to door motor, a step motor built into the door motor rotates according to the drive signal, and then stops at the target door position.
•  Rotation of motor is transmitted to air mix door (upper air mix door and lower air mix door) by link, rod and lever, then air flow temperature is switched.

DRIVE METHOD

•  The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing pattern of excitation.

MODE DOOR MOTOR

DESCRIPTION

•  The step motor system is adopted for mode door motor.
•  When a drive signal is input from front air control to door motor, a step motor built into the door motor rotates according to the drive signal, and then stops at the target door position.
•  Rotation of motor is transmitted to mode door (center ventilator and defroster door, sub defroster door, side ventilator door, and foot door) by link, rod, and lever, then air outlet is switched.

DRIVE METHOD

•  The 4 drive coils are excited in sequence in order to drive the motor.
•  Direction of rotation is changeable by recomposing pattern of excitation.

INTAKE DOOR MOTOR

•  Motor operates intake door according to control signal from front air control.
•  Rotation of motor is transmitted to intake door by lever, then air inlet is switched.

SWITCHES AND THEIR CONTROL FUNCTION

1. Intake door
2. Blower motor
3. Air conditioner filter
4. Evaporator
5. Upper air mix door (driver side/passenger side)
6. Lower air mix door (driver side/passenger side)
7. Heater core
8. Foot door
9. Side ventilator door
10. Sub defroster door
11. Center ventilator and defroster door

Fresh air intake Recirculation air Discharge air Defroster Center ventilator Side ventilator Rear ventilator Front foot Rear foot

AIR DISTRIBUTION

Temperature Control

• When the ignition switch is in the ON position, the customer uses the front air control temperature control dial to set the desired temperature.
•  The front air control calculates the target front air mix door opening angle depending on the selected temperature, intake temperature sensor, engine coolant temperature and rpm, and ambient temperature.
•  Front air mix door is controlled depending on the comparison of current front air mix door opening angle and target front air mix door opening angle.
•  Regardless of ambient temperature, the front air mix door is fixed at the fully cold position when the temperature control dial is set at the full cold position and fixed at the fully hot position when the temperature control dial is set at the full hot position.

OPERATION

Switch Name and Function

A/C Switch Assembly

1. A/C switch
2.  Blower control dial (with OFF switch)
3.  DEF switch
4.  Rear DEF switch
5.  REC switch
6.  Temperature control dial
7.  MAX A/C switch
8.  D/F switch
9.  FOOT switch
10.  B/L switch
11.  VENT switch

Switch Operation

DIAGNOSIS SYSTEM (HVAC)

Description

Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings using diagnosis function of each control unit.

CONSULT Function (HVAC)

CONSULT can display each diagnosis item using the diagnosis test modes as shown.

CONSULT application items

SELF-DIAGNOSTIC RESULT

Refer to HAC-134, "DTC Index".

Display Item List

DATA MONITOR

Display item list

WORK SUPPORT

NOTE: When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of WORK SUPPORT may be cancelled.

ACTIVE TEST

HVAC TEST

NOTE: Perform the inspection of each output device after starting the engine, because the A/C compressor has been operating.

DIAGNOSIS SYSTEM (IPDM E/R)

CONSULT Function (IPDM E/R)

APPLICATION ITEM

CONSULT performs the following functions via CAN communication with IPDM E/R.

ECU IDENTIFICATION

The IPDM E/R part number is displayed.

SELF DIAGNOSTIC RESULT

Refer to PCS-20, "DTC Index".

DATA MONITOR

ACTIVE TEST

CAN DIAG SUPPORT MNTR

Refer to LAN-14, "CAN Diagnostic Support Monitor".

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