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AUTOMATIC AIR CONDITIONER


J AIR CONDITIONER

                                                                                                                                                            A




                                                                                  SECTION
                                                            AUTOMATIC AIR CONDITIONER
                                                                                                            ATC                                             B



                                                                                                                                                            C


                                                                                                                                                            D


                                                                                                                                                            E
                                                               CONTENTS
PRECAUTIONS ......................................................... 5
                                                                     .            DESCRIPTION ................................................... 23
                                                                                                                                                   .        F
 Precautions for Supplemental Restraint System                                  Component Layout ................................................ 26
                                                                                                                                                   .
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                       LUBRICANT ............................................................. 27
                                                                                                                                                   .
 SIONER" ................................................................. 5
                                                                     .          Maintenance of Lubricant Quantity in Compressor 27                 ...      G
 Precautions for Working with HFC-134a (R-134a) 5                    .....        LUBRICANT ....................................................... 27
                                                                                                                                                   .
   CONTAMINATED REFRIGERANT ...................... 5                 .            LUBRICANT RETURN OPERATION ................. 27                  .
 General Refrigerant Precautions ............................. 7     .            LUBRICANT ADJUSTING PROCEDURE FOR
                                                                                                                                                            H
 Lubricant Precautions ............................................. 7
                                                                     .            COMPONENTS REPLACEMENT EXCEPT
 Precautions for Refrigerant Connection .................. 8         .            COMPRESSOR ................................................. 28  .
   ABOUT ONE-TOUCH JOINT ............................... 8           .            LUBRICANT ADJUSTING PROCEDURE FOR
   FEATURES OF NEW TYPE REFRIGERANT                                               COMPRESSOR REPLACEMENT ...................... 29                 .         I
   CONNECTION ................................................... 10 .         AIR CONDITIONER CONTROL .............................. 30           .
   O-RING AND REFRIGERANT CONNECTION....11                                      Description of Air Conditioner LAN Control System 30               ...
 Precautions for Servicing Compressor .................. 13          .          System Construction ............................................. 30
                                                                                                                                                   .        ATC
 Precautions for Service Equipment ....................... 13        .            OPERATION ....................................................... 30
                                                                                                                                                   .
   RECOVERY/RECYCLING EQUIPMENT ........... 13                       .            TRANSMISSION DATA AND TRANSMISSION
   ELECTRONIC LEAK DETECTOR ..................... 13                 .            ORDER .............................................................. 31
                                                                                                                                                   .
                                                                                                                                                            K
   VACUUM PUMP ................................................ 14   .            AIR MIX DOOR CONTROL (AUTOMATIC TEM-
   MANIFOLD GAUGE SET ................................... 14         .            PERATURE CONTROL) .................................... 32        .
   SERVICE HOSES .............................................. 14   .            FAN SPEED CONTROL ..................................... 32       .
   SERVICE COUPLERS ....................................... 15       .            INTAKE DOOR CONTROL ................................ 32          .         L
   REFRIGERANT WEIGHT SCALE ..................... 15                 .            OUTLET DOOR CONTROL ............................... 32           .
   CHARGING CYLINDER ..................................... 15        .            MAGNET CLUTCH CONTROL .......................... 33              .
 Precautions for Leak Detection Dye ...................... 16        .            SELF-DIAGNOSTIC SYSTEM ........................... 33            .        M
   IDENTIFICATION ............................................... 16 .          Description of Control System ............................... 34   .
   IDENTIFICATION LABEL FOR VEHICLE .......... 16                    .          Control Operation .................................................. 34
                                                                                                                                                   .
 Wiring Diagrams and Trouble Diagnosis ............... 16            .            DISPLAY SCREEN ............................................. 35  .
PREPARATION ........................................................ 17
                                                                     .            AUTO SWITCH .................................................. 35.
 Special Service Tools ............................................ 17
                                                                     .            TEMPERATURE SWITCH (POTENTIO TEM-
 HFC-134a (R-134a) Service Tools and Equipment 18                    ...          PERATURE CONTROL) (DRIVER SIDE) .......... 35                    .
 Commercial Service Tools ..................................... 20   .            TEMPERATURE SWITCH (POTENTIO TEM-
REFRIGERATION SYSTEM .................................... 21         .            PERATURE CONTROL) (PASSENGER SIDE)... 35
 Refrigerant Cycle .................................................. 21
                                                                     .            RECIRCULATION (REC) SWITCH .................... 35               .
   REFRIGERANT FLOW ...................................... 21        .            FRESH (FRE) SWITCH ..................................... 35      .
   FREEZE PROTECTION .................................... 21         .            DEFROSTER (DEF) SWITCH ............................ 35           .
 Refrigerant System Protection .............................. 21     .            REAR WINDOW DEFOGGER SWITCH ............ 35                      .
   REFRIGERANT PRESSURE SENSOR ............ 21                       .            OFF SWITCH ..................................................... 35
                                                                                                                                                   .
   PRESSURE RELIEF VALVE .............................. 21           .            A/C SWITCH ...................................................... 35
                                                                                                                                                   .
 V-6 Variable Displacement Compressor ................ 22            .            MODE SWITCH ................................................. 35 .
   GENERAL INFORMATION ................................ 22           .            FAN SWITCH ..................................................... 35
                                                                                                                                                   .


Revision: 2004 November                                                 ATC-1                                                   2004.5 FX35/FX45
   DUAL SWITCH (WITH LEFT AND RIGHT VEN-                                           SYSTEM DESCRIPTION ....................................74              .
   TILATION TEMPERATURE SEPARATELY                                                 COMPONENT DESCRIPTION ...........................75                    .
   CONTROL SYSTEM) ......................................... 35         .          DIAGNOSTIC PROCEDURE FOR AIR MIX
 Fail-safe Function .................................................. 36
                                                                        .          DOOR .................................................................75
                                                                                                                                                          .
 Discharge Air Flow ................................................ 37 .        Air Mix Door Motor PBR Circuit .............................75           .
 System Description ................................................ 38 .          DIAGNOSTIC PROCEDURE FOR AIR MIX
   SWITCHES AND THEIR CONTROL FUNCTION 38                               ...        DOOR PBR .........................................................75   .
 CAN Communication System Description ............. 39                  .        Intake Door Motor Circuit .......................................76      .
TROUBLE DIAGNOSIS ........................................... 40        .          INSPECTION FLOW ...........................................76          .
 CONSULT-II ........................................................... 40
                                                                        .          SYSTEM DESCRIPTION ....................................77              .
   CONSULT-II BASIC OPERATION ...................... 40                 .          COMPONENT DESCRIPTION ...........................78                    .
   DATA MONITOR ................................................. 40    .          DIAGNOSTIC PROCEDURE FOR INTAKE
 How to Perform Trouble Diagnosis for Quick and                                    DOOR MOTOR ...................................................78       .
 Accurate Repair ..................................................... 41
                                                                        .        Blower Motor Circuit ...............................................79   .
   WORK FLOW ..................................................... 41   .          INSPECTION FLOW ...........................................79          .
   SYMPTOM TABLE ............................................. 42       .          SYSTEM DESCRIPTION ....................................80              .
 Component Parts and Harness Connector Location 43                      ...        COMPONENT DESCRIPTION ...........................81                    .
   ENGINE COMPARTMENT ................................. 43              .          DIAGNOSTIC PROCEDURE FOR BLOWER
   PASSENGER COMPARTMENT ......................... 44                   .          MOTOR ...............................................................81.
 Schematic .............................................................. 45
                                                                        .          COMPONENT INSPECTION ..............................83                  .
 Wiring Diagram --A/C-- ........................................ 46     .        Magnet Clutch Circuit .............................................84    .
 Auto Amp. Terminals and Reference Value ........... 51                 .          INSPECTION FLOW ...........................................84          .
   PIN CONNECTOR TERMINAL LAYOUT ........... 51                         .          SYSTEM DESCRIPTION ....................................85              .
   TERMINALS AND REFERENCE VALUE FOR                                               DIAGNOSTIC PROCEDURE FOR MAGNET
   UNIFIED METER AND A/C AMP. ....................... 51                .          CLUTCH .............................................................85 .
 Self-diagnosis Function ......................................... 53   .          COMPONENT INSPECTION ..............................90                  .
   DESCRIPTION ................................................... 53   .        Insufficient Cooling .................................................91 .
   FUNCTION CONFIRMATION PROCEDURE ..... 54                             .          INSPECTION FLOW ...........................................91          .
   AUXILIARY MECHANISM: TEMPERATURE                                                PERFORMANCE TEST DIAGNOSES ...............93                           .
   SETTING TRIMMER .......................................... 59        .          PERFORMANCE CHART ...................................95                .
   AUXILIARY MECHANISM: FOOT POSITION                                              TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
   SETTING TRIMMER .......................................... 60        .          SURE ..................................................................96
                                                                                                                                                          .
   AUXILIARY MECHANISM: INLET PORT MEM-                                            DIAGNOSTIC PROCEDURE FOR INSUFFI-
   ORY FUNCTION ................................................ 60     .          CIENT COOLING ................................................98       .
 Operational Check ................................................. 61 .        Insufficient Heating .............................................. 100  .
   CHECKING MEMORY FUNCTION .................... 61                     .          INSPECTION FLOW ......................................... 100          .
   CHECKING BLOWER ........................................ 61          .        Noise .................................................................... 101
                                                                                                                                                          .
   CHECKING DISCHARGE AIR ........................... 61                .          INSPECTION FLOW ......................................... 101          .
   CHECKING RECIRCULATION ........................... 62                .        Self-diagnosis ...................................................... 102.
   CHECKING TEMPERATURE DECREASE ........ 62                            .          INSPECTION FLOW ......................................... 102          .
   CHECKING TEMPERATURE INCREASE ......... 62                           .        Memory Function ................................................. 103    .
   CHECK A/C SWITCH ......................................... 62        .          INSPECTION FLOW ......................................... 103          .
   CHECKING AUTO MODE .................................. 63             .        Ambient Sensor Circuit ........................................ 104      .
 Power Supply and Ground Circuit for Auto Amp. ... 63                              COMPONENT DESCRIPTION ......................... 104                    .
   INSPECTION FLOW .......................................... 63        .          AMBIENT TEMPERATURE INPUT PROCESS .104
   COMPONENT DESCRIPTION ........................... 64                 .          DIAGNOSTIC PROCEDURE FOR AMBIENT
   DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 64                               ...        SENSOR ........................................................... 104 .
 LAN System Circuit ............................................... 66  .          COMPONENT INSPECTION ............................ 106                  .
   DIAGNOSTIC PROCEDURE FOR LAN CIR-                                             In-vehicle Sensor Circuit ...................................... 107     .
   CUIT ................................................................... 66
                                                                        .          COMPONENT DESCRIPTION ......................... 107                    .
 Mode Door Motor Circuit ....................................... 70     .          DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
   INSPECTION FLOW .......................................... 70        .          SENSOR ........................................................... 108 .
   SYSTEM DESCRIPTION ................................... 71            .          COMPONENT INSPECTION ............................ 109                  .
   COMPONENT DESCRIPTION ........................... 72                 .        Sunload Sensor Circuit ........................................ 110      .
   DIAGNOSTIC PROCEDURE FOR MODE                                                   COMPONENT DESCRIPTION ......................... 110                    .
   DOOR MOTOR .................................................. 72     .          SUNLOAD INPUT PROCESS .......................... 110                   .
 Air Mix Door Motor Circuit ..................................... 73    .          DIAGNOSTIC PROCEDURE FOR SUNLOAD
   INSPECTION FLOW .......................................... 73        .          SENSOR ........................................................... 110 .


Revision: 2004 November                                                   ATC-2                                                     2004.5 FX35/FX45
    COMPONENT INSPECTION ............................112                  .       AIR MIX DOOR MOTOR ........................................ 132          .
  Intake Sensor Circuit ............................................113   .        Removal and Installation ..................................... 132      .       A
    COMPONENT DESCRIPTION .........................113                    .          REMOVAL ........................................................ 132  .
    DIAGNOSTIC PROCEDURE FOR INTAKE SEN-                                             INSTALLATION ................................................ 132     .
    SOR ..................................................................113
                                                                          .       HEATER CORE ...................................................... 133   .       B
    COMPONENT INSPECTION ............................114                  .        Removal and Installation ..................................... 133      .
CONTROLLER .......................................................115     .          REMOVAL ........................................................ 133  .
  Removal and Installation of A/C and AV Switch ...115                    .          INSTALLATION ................................................ 133     .
    REMOVAL .........................................................115  .       DUCTS AND GRILLES .......................................... 134         .       C
    INSTALLATION .................................................115     .        Removal and Installation ..................................... 134      .
AUTO AMP .............................................................116 .          REMOVAL ........................................................ 134  .
  Removal and Installation of Unified Meter and A/C                                  INSTALLATION ................................................ 137     .       D
  Amp. .....................................................................116
                                                                          .       REFRIGERANT LINES .......................................... 138         .
    REMOVAL .........................................................116  .        HFC-134a (R-134a) Service Procedure .............. 138                  .
    INSTALLATION .................................................116     .          SETTING OF SERVICE TOOLS AND EQUIP-                                           E
AMBIENT SENSOR ................................................117        .          MENT ............................................................... 138
                                                                                                                                                           .
  Removal and Installation ......................................117      .        Components ........................................................ 140 .
    REMOVAL .........................................................117  .          VK45DE ............................................................ 140
                                                                                                                                                           .
    INSTALLATION .................................................117     .          VQ35DE ........................................................... 141.       F
IN-VEHICLE SENSOR ............................................118         .        Removal and Installation of Compressor ............. 141                .
  Removal and Installation ......................................118      .          REMOVAL ........................................................ 141  .
    REMOVAL .........................................................118  .          INSTALLATION ................................................ 143     .       G
    INSTALLATION .................................................118     .        Removal and Installation of Compressor Clutch . 144
SUNLOAD SENSOR ..............................................119          .          REMOVAL ........................................................ 144  .
  Removal and Installation ......................................119      .          INSTALLATION ................................................ 146     .       H
    REMOVAL .........................................................119  .        Removal and Installation of Low-pressure Flexible
    INSTALLATION .................................................119     .        Hose .................................................................... 148
                                                                                                                                                           .
INTAKE SENSOR .................................................. 120      .          REMOVAL ........................................................ 148  .
                                                                                                                                                                    I
  Removal and Installation ..................................... 120      .          INSTALLATION ................................................ 149     .
    REMOVAL ........................................................ 120  .        Removal and Installation of High-pressure Flexible
    INSTALLATION ................................................ 120     .        Hose .................................................................... 149
                                                                                                                                                           .
BLOWER UNIT ...................................................... 121    .          REMOVAL ........................................................ 149  .       ATC
  Removal and Installation ..................................... 121      .          INSTALLATION ................................................ 150     .
    REMOVAL ........................................................ 121  .        Removal and Installation of Low-pressure Pipe 1
    INSTALLATION ................................................ 121     .        (Engine Compartment) ........................................ 150       .       K
  Disassembly and Assembly ................................ 122           .          REMOVAL ........................................................ 150  .
BLOWER MOTOR ................................................. 123        .          INSTALLATION ................................................ 151     .
  Removal and Installation ..................................... 123      .        Removal and Installation of High-pressure Pipe 1                                 L
    REMOVAL ........................................................ 123  .        and 2 (Engine Compartment) .............................. 151           .
    INSTALLATION ................................................ 123     .          REMOVAL ........................................................ 151  .
INTAKE DOOR MOTOR ........................................ 124            .          INSTALLATION ................................................ 152     .
  Removal and Installation ..................................... 124      .        Removal and Installation of Low-pressure Pipe 2                                 M
    REMOVAL ........................................................ 124  .        and High-pressure Pipe 3 .................................... 152       .
    INSTALLATION ................................................ 124     .          REMOVAL ........................................................ 152  .
IN-CABIN MICROFILTER ...................................... 125           .          INSTALLATION ................................................ 153     .
  Removal and Installation ..................................... 125      .        Removal and Installation of Liquid Tank .............. 154              .
    FUNCTION ....................................................... 125  .          REMOVAL ........................................................ 154  .
    REPLACEMENT TIMING ................................. 125              .          INSTALLATION ................................................ 155     .
    REPLACEMENT PROCEDURES .................... 125                       .        Removal and Installation of Condenser ............... 155               .
HEATER & COOLING UNIT ASSEMBLY ............. 126                          .          REMOVAL ........................................................ 155  .
  Removal and Installation ..................................... 126      .          INSTALLATION ................................................ 156     .
    REMOVAL ........................................................ 126  .        Removal and Installation of Refrigerant Pressure
    INSTALLATION ................................................ 127     .        Sensor ................................................................. 156
                                                                                                                                                           .
  Disassembly and Assembly ................................ 129           .          REMOVAL ........................................................ 156  .
MODE DOOR MOTOR .......................................... 131            .          INSTALLATION ................................................ 156     .
  Removal and Installation ..................................... 131      .        Removal and Installation of Evaporator ............... 156              .
    REMOVAL ........................................................ 131  .          REMOVAL ........................................................ 156  .
    INSTALLATION ................................................ 131     .          INSTALLATION ................................................ 157     .
                                                                                   Removal and Installation of Expansion Valve ...... 157                  .

Revision: 2004 November                                                    ATC-3                                                     2004.5 FX35/FX45
   REMOVAL ........................................................ 157
                                                                      .          DETECTOR ...................................................... 159  .
   INSTALLATION ................................................. 157 .          CHECKING PROCEDURE ............................... 160               .
 Checking for Refrigerant Leaks ........................... 158       .       SERVICE DATA AND SPECIFICATIONS (SDS) ... 162                           .
 Checking System for Leaks Using the Fluorescent                               Compressor ......................................................... 162
                                                                                                                                                      .
 Leak Detector ...................................................... 158
                                                                      .        Lubricant .............................................................. 162
                                                                                                                                                      .
 Dye Injection ........................................................ 158
                                                                      .        Refrigerant ........................................................... 162
                                                                                                                                                      .
 Electronic Refrigerant Leak Detector ................... 159         .        Engine Idling Speed ............................................. 162  .
   PRECAUTIONS FOR HANDLING LEAK                                               Belt Tension ......................................................... 162
                                                                                                                                                      .




Revision: 2004 November                                                ATC-4                                                     2004.5 FX35/FX45
                                              PRECAUTIONS

PRECAUTIONS                                                         PFP:00001
                                                                                                                         A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                           AJS001BM


The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along                            B
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front              C
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:                                                                                                                 D
q    To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
     in the event of a collision which would result in air bag inflation, all maintenance must be per-
     formed by an authorized NISSAN/INFINITI dealer.                                                                     E
q    Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
     sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
     Bag Module, see the SRS section.                                                                                    F
q    Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
     Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
     harness connectors.
                                                                                                                         G
Precautions for Working with HFC-134a (R-134a)                                                                AJS0013V


WARNING:
q CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants H
  are mixed and compressor malfunction is likely to occur, refer to "CONTAMINATED REFRIGER-
  ANT" below. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use
  Refrigerant Recovery/Recycling Recharging equipment and Refrigerant Identifier.                     I
q Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-
  nents. If lubricant other than that specified is used, compressor malfunction is likely to occur.
q The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol- ATC
  lowing handling precautions must be observed:



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