sensor NISSAN 350Z 2007 Z33 Automatic Air Conditioner Workshop Manual

ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
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AUTOMATIC AIR CONDITIONER
PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 4
Precautions for Battery Service ................................ 4
Precautions for Procedures without Cowl Top Cover ..... 4
Precautions for Working with HFC-134a (R-134a) ..... 5
CONTAMINATED REFRIGERANT ....................... 5
General Refrigerant Precautions .............................. 6
Precautions for Refrigerant Connection ................... 7
ABOUT ONE-TOUCH JOINT ................................ 7
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ...................................................... 9
O-RING AND REFRIGERANT CONNECTION ... 10
Precautions for Servicing Compressor ................... 12
Precautions for Service Equipment ........................ 12
RECOVERY/RECYCLING EQUIPMENT ............ 12
ELECTRICAL LEAK DETECTOR ....................... 12
VACUUM PUMP ................................................. 12
MANIFOLD GAUGE SET .................................... 12
SERVICE HOSES ............................................... 13
SERVICE COUPLERS ........................................ 13
REFRIGERANT WEIGHT SCALE ...................... 13
CHARGING CYLINDER ...................................... 13
Precautions for Leak Detection Dye ....................... 14
IDENTIFICATION ................................................ 14
IDENTIFICATION LABEL FOR VEHICLE ........... 14
PREPARATION ......................................................... 15
Special Service Tools ............................................. 15
HFC-134a (R-134a) Service Tools and Equipment ... 16
Commercial Service Tools ...................................... 18
REFRIGERATION SYSTEM ..................................... 19
Refrigerant Cycle ................................................... 19
REFRIGERANT FLOW ....................................... 19
FREEZE PROTECTION ..................................... 19
Refrigerant System Protection ............................... 19
REFRIGERANT PRESSURE SENSOR ............. 19
PRESSURE RELIEF VALVE ............................... 19
Component Layout ................................................. 20LUBRICANT .............................................................. 21
Maintenance of Lubricant Quantity in Compressor ... 21
LUBRICANT ........................................................ 21
LUBRICANT RETURN OPERATION .................. 21
LUBRICANT ADJUSTING PROCEDURE FOR
COMPONENTS REPLACEMENT EXCEPT
COMPRESSOR .................................................. 22
LUBRICANT ADJUSTING PROCEDURE FOR
COMPRESSOR REPLACEMENT ....................... 23
AIR CONDITIONER CONTROL ............................... 24
Description of Air Conditioner LAN Control System ... 24
System Construction .............................................. 24
OPERATION ........................................................ 25
TRANSMISSION DATA AND TRANSMISSION
ORDER ............................................................... 25
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL) ..................................... 26
FAN SPEED CONTROL ...................................... 26
INTAKE DOOR CONTROL ................................. 26
MODE DOOR CONTROL ................................... 26
MAGNET CLUTCH CONTROL ........................... 27
SELF-DIAGNOSIS SYSTEM .............................. 27
Description of Control System ................................ 28
Control Operation ................................................... 29
MODE CONTROL DIAL ...................................... 29
TEMPERATURE CONTROL DIAL (POTENTIO
TEMPERATURE CONTROL) .............................. 29
FAN CONTROL DIAL .......................................... 29
REAR WINDOW DEFOGGER SWITCH ............. 29
INTAKE SWITCH ................................................. 29
A/C SWITCH ....................................................... 29
Discharge Air Flow ................................................. 30
System Description ................................................. 31
SWITCHES AND THEIR CONTROL FUNCTION ... 31
CAN Communication System Description .............. 32
TROUBLE DIAGNOSIS ............................................ 33
CONSULT-III Function (BCM) ................................ 33
DATA MONITOR ................................................. 33
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 34

ATC-2Revision: 2006 November2007 350Z WORK FLOW ...................................................... 34
SYMPTOM TABLE .............................................. 34
Component Parts and Harness Connector Location ... 35
ENGINE COMPARTMENT .................................. 35
PASSENGER COMPARTMENT .......................... 36
Schematic ............................................................... 37
Wiring Diagram — A/C — ....................................... 38
Auto Amp. Terminals and Reference Value ............ 43
PIN CONNECTOR TERMINAL LAYOUT ............ 43
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ........................ 43
Self-diagnosis Function .......................................... 45
DESCRIPTION .................................................... 45
FUNCTION CONFIRMATION PROCEDURE ...... 46
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................... 50
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................... 51
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION ................................................. 51
Operational Check .................................................. 53
CHECKING BLOWER ......................................... 53
CHECKING DISCHARGE AIR ............................ 53
CHECKING INTAKE DOOR ................................ 53
CHECKING TEMPERATURE DECREASE ......... 53
CHECKING TEMPERATURE INCREASE .......... 53
CHECKING A/C SWITCH ................................... 53
Power Supply and Ground Circuit for Auto Amp. ... 54
INSPECTION FLOW ........................................... 54
COMPONENT DESCRIPTION ............................ 54
DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 55
LAN System Circuit ................................................ 56
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 56
Mode Door Motor Circuit ........................................ 60
INSPECTION FLOW ........................................... 60
SYSTEM DESCRIPTION .................................... 61
COMPONENT DESCRIPTION ............................ 62
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR ............................................................... 62
Air Mix Door Motor Circuit ...................................... 63
INSPECTION FLOW ........................................... 63
SYSTEM DESCRIPTION .................................... 64
COMPONENT DESCRIPTION ............................ 65
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR ... 65
Air Mix Door Motor PBR Circuit .............................. 65
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR PBR ....................................................... 65
Intake Door Motor Circuit ........................................ 66
INSPECTION FLOW ........................................... 66
SYSTEM DESCRIPTION .................................... 67
COMPONENT DESCRIPTION ............................ 68
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR ............................................................... 68
Blower Motor Circuit ............................................... 69
INSPECTION FLOW ........................................... 69
SYSTEM DESCRIPTION .................................... 70
COMPONENT DESCRIPTION ............................ 71
DIAGNOSIS PROCEDURE FOR BLOWER
MOTOR ............................................................... 71COMPONENT INSPECTION ............................... 73
Magnet Clutch Circuit .............................................. 74
INSPECTION FLOW ............................................ 74
SYSTEM DESCRIPTION ..................................... 75
DIAGNOSIS PROCEDURE FOR MAGNET
CLUTCH .............................................................. 75
COMPONENT INSPECTION ............................... 80
Insufficient Cooling .................................................. 81
INSPECTION FLOW ............................................ 81
PERFORMANCE TEST DIAGNOSIS .................. 83
PERFORMANCE CHART .................................... 85
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE ................................................................... 86
Insufficient Heating ................................................. 89
INSPECTION FLOW ............................................ 89
Noise ....................................................................... 90
INSPECTION FLOW ............................................ 90
Self-diagnosis ......................................................... 91
INSPECTION FLOW ............................................ 91
Ambient Sensor Circuit ........................................... 92
COMPONENT DESCRIPTION ............................ 92
AMBIENT TEMPERATURE INPUT PROCESS ... 92
DIAGNOSIS PROCEDURE FOR AMBIENT
SENSOR .............................................................. 92
COMPONENT INSPECTION ............................... 94
In-vehicle Sensor Circuit ......................................... 94
COMPONENT DESCRIPTION ............................ 94
DIAGNOSIS PROCEDURE FOR IN-VEHICLE
SENSOR .............................................................. 95
COMPONENT INSPECTION ............................... 96
Sunload Sensor Circuit ........................................... 97
COMPONENT DESCRIPTION ............................ 97
SUNLOAD INPUT PROCESS ............................. 97
DIAGNOSIS PROCEDURE FOR SUNLOAD
SENSOR .............................................................. 97
COMPONENT INSPECTION ............................... 99
Intake Sensor Circuit .............................................100
COMPONENT DESCRIPTION ..........................100
DIAGNOSIS PROCEDURE FOR INTAKE SEN-
SOR ...................................................................100
COMPONENT INSPECTION .............................101
A/C CONTROLLER .................................................102
Removal and Installation .......................................102
REMOVAL ..........................................................102
INSTALLATION ..................................................102
Disassembly and Assembly ..................................102
AUTO AMP ..............................................................103
Removal and Installation of Unified Meter and A/C
Amp. ......................................................................103
REMOVAL ..........................................................103
INSTALLATION ..................................................103
AMBIENT SENSOR ................................................104
Removal and Installation .......................................104
REMOVAL ..........................................................104
INSTALLATION ..................................................104
IN-VEHICLE SENSOR ............................................105
Removal and Installation .......................................105
REMOVAL ..........................................................105
INSTALLATION ..................................................105

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Removal and Installation ...................................... 106
REMOVAL ......................................................... 106
INSTALLATION ................................................. 106
INTAKE SENSOR ................................................... 107
Removal and Installation ...................................... 107
REMOVAL ......................................................... 107
INSTALLATION ................................................. 107
BLOWER UNIT ....................................................... 108
Removal and Installation ...................................... 108
REMOVAL ......................................................... 108
INSTALLATION ................................................. 108
Disassembly and Assembly ................................. 109
BLOWER MOTOR ...................................................110
Removal and Installation ....................................... 110
REMOVAL .......................................................... 110
INSTALLATION .................................................. 110
INTAKE DOOR MOTOR .......................................... 111
Removal and Installation ...................................... . 111
REMOVAL ......................................................... . 111
INSTALLATION ................................................. . 111
HEATER & COOLING UNIT ASSEMBLY ...............112
Removal and Installation ....................................... 112
REMOVAL .......................................................... 112
INSTALLATION .................................................. 113
Disassembly and Assembly .................................. 114
MODE DOOR MOTOR ............................................116
Removal and Installation ....................................... 116
REMOVAL .......................................................... 116
INSTALLATION .................................................. 116
AIR MIX DOOR MOTOR ..........................................117
Removal and Installation ....................................... 117
REMOVAL .......................................................... 117
INSTALLATION .................................................. 117
HEATER CORE .......................................................118
Removal and Installation ....................................... 118
REMOVAL .......................................................... 118
INSTALLATION .................................................. 118
DUCTS AND GRILLES ...........................................119
Removal and Installation ....................................... 119
COMPONENT LAYOUT ..................................... 119
REMOVAL .......................................................... 119
INSTALLATION ................................................. 122
REFRIGERANT LINES ........................................... 123
HFC-134a (R-134a) Service Procedure ............... 123
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................ 123
Components ......................................................... 125
Removal and Installation of Compressor ............. 125REMOVAL .........................................................125
INSTALLATION .................................................126
Check Disc to Pulley Clearance ...........................126
Removal and Installation of Low-pressure Flexible
Hose and Pipe 2 ...................................................127
REMOVAL .........................................................127
INSTALLATION .................................................128
Removal and Installation of High-pressure Flexible
Hose .....................................................................128
REMOVAL .........................................................128
INSTALLATION .................................................129
Removal and Installation of High-pressure Pipe 1
(Engine Compartment) .........................................130
REMOVAL .........................................................130
INSTALLATION .................................................130
Removal and Installation of Low-pressure Pipe 1
and High-pressure Pipe 2 .....................................131
REMOVAL .........................................................131
INSTALLATION .................................................132
Removal and Installation of Liquid Tank ...............132
REMOVAL .........................................................132
INSTALLATION .................................................133
Removal and Installation of Condenser ................133
REMOVAL .........................................................133
INSTALLATION .................................................134
Removal and Installation of Refrigerant Pressure
Sensor ..................................................................135
REMOVAL .........................................................135
INSTALLATION .................................................135
Removal and Installation of Evaporator ................135
REMOVAL .........................................................135
INSTALLATION .................................................135
Removal and Installation of Expansion Valve .......137
REMOVAL .........................................................137
INSTALLATION .................................................137
Checking for Refrigerant Leaks ............................138
Checking System for Leaks Using the Fluorescent
Leak Detector .......................................................138
Dye Injection .........................................................138
Electrical Leak Detector ........................................139
PRECAUTIONS FOR HANDLING LEAK
DETECTOR .......................................................139
CHECKING PROCEDURE ...............................140
SERVICE DATA AND SPECIFICATIONS (SDS) ....142
Compressor ..........................................................142
Lubricant ...............................................................142
Refrigerant ............................................................142
Engine Idling Speed .............................................142
Belt Tension ..........................................................142

PRECAUTIONS
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Precautions for Refrigerant ConnectionNJS00006
A new type refrigerant connection has been introduced to all refrigerant lines except the following location.

Expansion valve to evaporator

Refrigerant pressure sensor to liquid tank
ABOUT ONE-TOUCH JOINT
Description

One-touch joints are pipe joints which do not require tools during piping connection.

Unlike conventional connection methods using union nuts and flanges, controlling tightening torque at
connection point is not necessary.

When removing a pipe joint, use a disconnector.
COMPONENT PARTS
FUNCTIONS OF COMPONENT PARTS
NOTE:

Garter spring (2) cannot be removed from cage (A) of male-side piping.

Indicator ring (3) remains near piping connection point, however, this is not a malfunction. (This is to
check piping connection during factory assembly.)
1 Pipe (Male-side)
Retains O-rings (4).

Retains garter spring (2) in cage (A).
2 Garter spring Anchors female-side piping (5).
3 Indicator ringWhen connection is made properly, this is ejected from male-side piping (1). (This part is no longer
necessary after connection.)
4 O-ring Seals connection point. (Not reusable)
5 Pipe (Female-side)

Seals connection by compressing O-rings (4).

Anchors piping connection using flare (B) and garter spring (2).
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PRECAUTIONS
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WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.

When the compressor is removed, store it in the same way at it is when mounted on the car. Fail-
ure to do so will cause lubricant to enter the low-pressure chamber.

When connecting tubes, always use a torque wrench and a back-up wrench.

After disconnecting tubes, immediately plug all openings to prevent entry of dust and moisture.

When installing an air conditioner in the vehicle, connect the pipes at the final stage of the opera-
tion. Never remove the seal caps of pipes and other components until just before required for con-
nection.

Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.

Thoroughly remove moisture from the refrigeration system before charging the refrigerant.

Always replace used O-rings.

When connecting tubes, apply lubricant to circle of the O-rings shown in illustration. Be careful
not to apply lubricant to threaded portion.

O-ring must be closely attached to the groove of tube.

When replacing the O-ring, be careful not to damage O-ring and tube.

Connect tube until a click can be heard, then tighten the nut or bolt by hand. Make sure that the O-
ring is installed to tube correctly.

After connecting line, perform leak test and make sure that there is no leakage from connections.
When the refrigerant leaking point is found, disconnect that line and replace the O-ring. Then
tighten connections of seal seat to the specified torque.
FormerRefrigerant pressure sensor to liquid tank J2476 89956 1 10
Expansion valve to evaporatorInlet 92475 71L00 1 12
Outlet 92475 72L00 1 16
Name : Nissan A/C system Oil Type S
Connection type Piping connection point Part number QTY O-ring size
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REFRIGERATION SYSTEM
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REFRIGERATION SYSTEMPFP:KA990
Refrigerant CycleNJS0000E
REFRIGERANT FLOW
The refrigerant flows from the compressor, through the condenser with liquid tank, through the evaporator, and
back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally equalized
expansion valve, located inside the evaporator case.
FREEZE PROTECTION
To prevent evaporator frozen up, the evaporator air temperature is monitored, and the voltage signal to the
unified meter and A/C amp. will make the A/C relay go OFF and stop the compressor.
Refrigerant System ProtectionNJS0000F
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-
sor, located on the liquid tank. If the system pressure rises above, or falls below the specifications, the refriger-
ant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm
2 , 398 psi), or below about 134 kPa
(1.4 kg/cm
2 , 19 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 unusual level [more than 3,600 kPa (36.7 kg/
cm
2 , 522 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
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ATC-24
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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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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