NISSAN 350Z 2007 Z33 Automatic Air Conditioner Owner's Manual

LUBRICANT
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LUBRICANTPFP:KLG00
Maintenance of Lubricant Quantity in CompressorNJS0000I
The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
sor when replacing any component or after a large refrigerant leakage occurred. It is important to maintain the
specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:

Lack of lubricant: May lead to a seized compressor.

Excessive lubricant: Inadequate cooling (thermal exchange interference)
LUBRICANT
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
1. CHECK LUBRICANT RETURN OPERATION
Can lubricant return operation be performed?

A/C system works properly.

There is no evidence of a large amount of lubricant leakage.
CAUTION:
If excessive lubricant leakage is noted, never perform the lubricant return operation.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS
1. Start the engine, and set to the following conditions:
–Engine speed: Idling to 1,200 rpm
–A/C switch: ON
–Blower speed: Max. position
–Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).]
–Intake position: Recirculation (REC)
2. Perform lubricant return operation for about 10 minutes.
3. Stop the engine.
>> GO TO 3.
3. CHECK REPLACEMENT PART
Should the compressor be replaced?
YES >> GO TO AT C - 2 3 , "LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACE-
MENT" .
NO >> GO TO AT C - 2 2 , "
LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACE-
MENT EXCEPT COMPRESSOR" . Name : Nissan A/C System Oil Type S

ATC-22
LUBRICANT
Revision: 2006 November2007 350Z
LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT EXCEPT COM-
PRESSOR
After replacing any of the following major components, add the correct amount of lubricant to the system.
Amount of lubricant to be added:
*1: If the refrigerant leak is small, no addition of lubricant is needed.Part replacedLubricant to be added to system
Remarks
Amount of lubricant
m (US fl oz, Imp fl oz)
Evaporator 75 (2.5, 2.6) —
Condenser 35 (1.2, 1.2) —
Liquid tank 10 (0.3, 0.4) —
In case of refrigerant leak30 (1.0, 1.1) Large leak
—
Small leak
*1

LUBRICANT
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LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT
1. Before connecting recovery/recycling recharging equipment to vehicle, check recovery/recycling recharg-
ing equipment gauges. No refrigerant pressure should be displayed. If NG, recover refrigerant from equip-
ment lines.
2. Connect recovery/recycling recharging equipment to vehicle. Confirm refrigerant purity in supply tank
using recovery/recycling recharging equipment and refrigerant identifier. If NG, refer to AT C - 5 , "
CONTAM-
INATED REFRIGERANT" .
3. Confirm refrigerant purity in vehicle A/C system using recovery/recycling recharging equipment and refrig-
erant identifier. If NG, refer to AT C - 5 , "
CONTAMINATED REFRIGERANT" .
4. Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure lubricant discharged into
the recovery/recycling equipment.
5. Drain the lubricant from the old (removed) compressor into a graduated container and recover the amount
of lubricant drained.
6. Drain the lubricant from the new compressor into a separate, clean container.
7. Measure an amount of new lubricant installed equal to amount drained from old compressor. Add this
lubricant to new compressor through the suction port opening.
8. Measure an amount of new lubricant equal to the amount recovered during discharging. Add this lubricant
to new compressor through the suction port opening.
9. If the liquid tank also needs to be replaced, add another 5 m (0.2 US fl oz, 0.2 Imp fl oz) of lubricant at
this time.
Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of lubricant when replaces the compressor only.
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AIR CONDITIONER CONTROL
Revision: 2006 November2007 350Z
AIR CONDITIONER CONTROLPFP:27500
Description of Air Conditioner LAN Control SystemNJS0000J
The LAN (Local Area Network) system consists of unified meter and A/C amp., mode door motor, air mix door
motor and intake door motor.
A configuration of these components is shown in the figure below.
System ConstructionNJS0000K
A small network is constructed between unified meter and A/C amp., air mix door motor, mode door motor and
intake door motor. The unified meter and A/C amp. and motors are connected by data transmission lines and
motor power supply lines. The LAN network is built through the ground circuits of each door motor.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the unified meter and A/C amp. and each door motor.
The following functions are contained in LCUs built into the air mix door motor, the mode door motor and the
intake door motor.

Address

Motor opening angle signal

Data transmission

Motor stop and drive decision

Opening angle sensor (PBR function)

Comparison

Decision (Unified meter and A/C amp. indicated value and motor opening angle comparison)
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AIR CONDITIONER CONTROL
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OPERATION
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door
motor LCU and intake door motor LCU.
The mode door motor, air mix door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors is compared by the LCUs in each motor with the existing decision and opening
angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data
are returned to the unified meter and A/C amp.
TRANSMISSION DATA AND TRANSMISSION ORDER
Unified meter and A/C amp. data is transmitted consecutively to each of the door motors following the form
shown in figure below.
Start:
Initial compulsory signal sent to each of the door motors.
Address:
Data sent from the unified meter and A/C amp. are selected according to data-based decisions made by the
air mix door motor, mode door motor and intake door motor.
If the addresses are identical, the opening angle data and error check signals are received by the door motor
LCUs. The LCUs then make the appropriate error decision. If the opening angle data have no error, door con-
trol begins.
If an error exists, the received data are rejected and corrected data received. Finally, door control is based
upon the corrected opening angle data.
Opening Angle:
Data that shows the indicated door opening angle of each door motor.
Error Check:
In this procedure, transmitted and received data are checked for errors. Error data are then compiled. The
error check prevents corrupted data from being used by the air mix door motor, the mode door motor and the
intake door motor. Error data can be related to the following symptoms.

Malfunction of electrical frequency

Poor electrical connections

Signal leakage from transmission lines

Signal level fluctuation
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ATC-26
AIR CONDITIONER CONTROL
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Stop Signal:
At the end of each transmission, a stop operation, in-operation, or internal malfunction message is delivered to
the unified meter and A/C amp. This completes one data transmission and control cycle.
AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)
The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
FAN SPEED CONTROL
Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
With FAN control dial set to AUTO, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOOR CONTROL
The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON/OFF operation of the compressor.
MODE DOOR CONTROL
The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
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AIR CONDITIONER CONTROL
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MAGNET CLUTCH CONTROL
When A/C switch is pressed, turn fan control dial to ON or set mode control dial to D/F, D/F2 or DEF position,
unified meter and A/C amp. transmits compressor ON signal to BCM.
BCM sends compressor ON signal to ECM, via CAN communication.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-
sor signal, throttle angle, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to
IPDM E/R, via CAN communication.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
When sending compressor ON signal to IPDM E/R via CAN communication line, ECM simultaneously sends
compressor feedback signal to unified meter and A/C amp. via CAN communication line.
Unified meter and A/C amp., then, uses input compressor feedback signal to control air inlet.
SELF-DIAGNOSIS SYSTEM
The self-diagnosis system is built into the unified meter and A/C amp. to quickly locate the cause of malfunc-
tions.
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AIR CONDITIONER CONTROL
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Description of Control SystemNJS0000L
The control system consists of input sensors, switches, unified meter and A/C amp. (microcomputer) and out-
puts. The relationship of these components is shown in the figure below:
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AIR CONDITIONER CONTROL
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Control OperationNJS0000M
MODE CONTROL DIAL
The air discharge outlets are controlled with this dial.
Mode doors are set to the defrost position with this dial. Also, intake doors are set to the outside air position.
When shifting mode control dial to D/F, D/F2 or DEF position under the following conditions, compressor is
turned ON. (A/C LED ON)

FAN: O N

A/C: OFF
TEMPERATURE CONTROL DIAL (POTENTIO TEMPERATURE CONTROL)
The set temperature is increased or decreased with this dial.
FAN CONTROL DIAL
The blower speed is automatically or manually controlled with this dial. Twenty-five speeds are available for
manual control.
Shifting fan control dial to AUTO, compressor is turned ON automatically.
REAR WINDOW DEFOGGER SWITCH
When illumination is ON, rear window is defogged.
INTAKE SWITCH

When intake switch is ON, REC LED turns ON, and air inlet is fixed to REC.

When press intake switch again, FRE LED turns ON, and air inlet is fixed to FRE.

When intake switch is pressed for approximately 1.5 seconds or longer, REC and FRE LEDs blink twice.
Then, automatic control mode is entered. Inlet status is displayed even during automatic control.

When FRE LED is turned ON, shifting mode control dial to D/F, D/F2 or DEF, or when compressor is
turned from ON to OFF, intake switch is automatically turned OFF (fixed to FRE mode). REC mode can be
re-entered by pressing intake switch again, and then compressor is turned ON. (Except D/F, D/F2 or DEF
position)
A/C SWITCH
Compressor is ON or OFF with this switch.
(Pressing the A/C switch when the fan control dial is ON, will turn OFF the A/C switch and compressor.)
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ATC-30
AIR CONDITIONER CONTROL
Revision: 2006 November2007 350Z
Discharge Air FlowNJS0000N
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