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MTC


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J AIR CONDITIONER

                                                                                                                                                               A




                                                                               SECTION
                                                                      MANUAL AIR CONDITIONER
                                                                                                         MTC                                                   B



                                                                                                                                                               C



                                                                                                                                                               D



                                                                                                                                                               E
                                                               CONTENTS
PRECAUTIONS ......................................................... 4
                                                                     .         LUBRICANT ............................................................. 19
                                                                                                                                                      .        F
 Precautions for Supplemental Restraint System                                  Maintenance of Lubricant Quantity in Compressor 19                    ...
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                          LUBRICANT ....................................................... 19.
 SIONER" ................................................................. 4
                                                                     .            CHECKING AND ADJUSTING ........................... 19               .        G
 Precautions for Working with HFC-134a (R-134a) 4                    .....     AIR CONDITIONER CONTROL .............................. 21              .
 Contaminated Refrigerant ....................................... 4  .          Description ............................................................. 21
                                                                                                                                                      .
 General Refrigerant Precautions ............................. 5     .          Operation ............................................................... 21
                                                                                                                                                      .
                                                                                                                                                               H
 Precautions for Leak Detection Dye ........................ 5       .            AIR MIX DOOR CONTROL ................................ 21            .
 A/C Identification Label ........................................... 6
                                                                     .            BLOWER SPEED CONTROL ............................ 21                .
 Precautions for Refrigerant Connection .................. 6         .            INTAKE DOORS CONTROL .............................. 21              .
   FEATURES OF NEW TYPE REFRIGERANT                                               MODE DOOR CONTROL .................................. 21             .         I
   CONNECTION ..................................................... 6.            DEFROSTER DOOR CONTROL ....................... 21                   .
   O-RING AND REFRIGERANT CONNECTION ..... 7                                      MAGNET CLUTCH CONTROL .......................... 21                 .
 Precautions for Servicing Compressor .................... 9         .          Description of Control System ............................... 23      .        MTC
 Precautions for Service Equipment ......................... 9       .          Control Operation .................................................. 24
                                                                                                                                                      .
   RECOVERY/RECYCLING EQUIPMENT ............. 9                      .            TEMPERATURE CONTROL DIAL (TEMPERA-
   ELECTRONIC LEAK DETECTOR ....................... 9                .            TURE CONTROL) .............................................. 24     .
                                                                                                                                                               K
   VACUUM PUMP ................................................ 10   .            RECIRCULATION () SWITCH ............................ 24             .
   MANIFOLD GAUGE SET ................................... 10         .            DEFROSTER () SWITCH ................................... 24          .
   SERVICE HOSES .............................................. 10   .            REAR WINDOW DEFOGGER SWITCH ............ 24                         .
   SERVICE COUPLERS ........................................11       .            OFF SWITCH (BLOWER SPEED SET TO 0) .... 24                          .        L
   REFRIGERANT WEIGHT SCALE ......................11                 .            A/C SWITCH ...................................................... 24.
   CHARGING CYLINDER ......................................11        .            MODE DIAL ........................................................ 24
                                                                                                                                                      .
 Wiring Diagrams and Trouble Diagnosis ................11            .            FRONT BLOWER CONTROL DIAL ................... 24                    .        M
PREPARATION ........................................................ 12
                                                                     .          Discharge Air Flow ................................................ 25.
 Special Service Tools ............................................ 12
                                                                     .            FRONT ............................................................... 25
                                                                                                                                                      .
 HFC-134a (R-134a) Service Tools and Equipment 12                    ...        System Description ................................................ 26.
 Commercial Service Tools ..................................... 15   .            SWITCHES AND THEIR CONTROL FUNCTION 26                              ...
REFRIGERATION SYSTEM .................................... 16         .          CAN Communication System Description ............. 27                 .
 Components .......................................................... 16
                                                                     .         TROUBLE DIAGNOSIS ........................................... 28       .
   REFRIGERATION SYSTEM .............................. 16            .          CONSULT-II Function (BCM) ................................ 28         .
 Refrigerant Cycle .................................................. 17
                                                                     .            CONSULT-II BASIC OPERATION ...................... 28                .
   REFRIGERANT FLOW ...................................... 17        .            DATA MONITOR ................................................ 29    .
   FREEZE PROTECTION .................................... 17         .          How to Perform Trouble Diagnosis for Quick and
 Refrigerant System Protection .............................. 17     .          Accurate Repair ..................................................... 30
                                                                                                                                                      .
   REFRIGERANT PRESSURE SENSOR ............ 17                       .            WORK FLOW ..................................................... 30  .
   PRESSURE RELIEF VALVE .............................. 18           .            SYMPTOM TABLE ............................................. 30      .
                                                                                Component Parts and Harness Connector Location 31                     ...
                                                                                  ENGINE COMPARTMENT ................................. 31             .
                                                                                  FRONT PASSENGER COMPARTMENT ........... 32                          .


Revision: November 2005                                                 MTC-1                                                         2005 Pathfinder
 Schematic .............................................................. 33 .          Insufficient Heating ................................................77  .
 Wiring Diagram -- A/C,M -- .................................. 34            .            INSPECTION FLOW ...........................................77          .
 Front Air Control Terminals and Reference Value... 38                                  Noise ......................................................................78
                                                                                                                                                                 .
   PIN CONNECTOR TERMINAL LAYOUT ........... 38                              .            INSPECTION FLOW ...........................................78          .
   TERMINALS AND REFERENCE VALUE FOR                                                    Intake Sensor Circuit ..............................................80   .
   FRONT AIR CONTROL ...................................... 38               .            COMPONENT DESCRIPTION ...........................80                    .
 Operational Check ................................................. 40      .            DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
   CHECKING BLOWER ........................................ 40               .            SOR ....................................................................80
                                                                                                                                                                 .
   CHECKING DISCHARGE AIR ........................... 40                     .            COMPONENT INSPECTION ..............................81                  .
   DISCHARGE AIR FLOW .................................... 40                .        CONTROL UNIT .......................................................82     .
   CHECKING RECIRCULATION ........................... 41                     .          Removal and Installation ........................................82      .
   CHECKING TEMPERATURE DECREASE ........ 41                                 .            FRONT AIR CONTROL ......................................82             .
   CHECKING TEMPERATURE INCREASE ......... 41                                .        INTAKE SENSOR .....................................................83      .
   CHECK A/C SWITCH ......................................... 41             .          Removal and Installation ........................................83      .
 Power Supply and Ground Circuit for Front Air Con-                                       REMOVAL ...........................................................83  .
 trol .......................................................................... 42
                                                                             .            INSTALLATION ...................................................83     .
   INSPECTION FLOW .......................................... 42             .        BLOWER MOTOR ....................................................84        .
   COMPONENT DESCRIPTION ........................... 43                      .          Components ...........................................................84 .
   DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 43                                    ...        Removal and Installation ........................................84      .
 Mode Door Motor Circuit ....................................... 45          .            REMOVAL ...........................................................84  .
   INSPECTION FLOW .......................................... 45             .            INSTALLATION ...................................................84     .
   SYSTEM DESCRIPTION ................................... 46                 .        IN-CABIN MICROFILTER .........................................85           .
   COMPONENT DESCRIPTION ........................... 46                      .          Removal and Installation ........................................85      .
   DIAGNOSTIC PROCEDURE FOR MODE                                                          FUNCTION .........................................................85   .
   DOOR MOTOR .................................................. 47          .            REPLACEMENT TIMING ...................................85               .
 Air Mix Door Motor Circuit ..................................... 49         .            REPLACEMENT PROCEDURE .........................85                      .
   INSPECTION FLOW .......................................... 49             .        HEATER & COOLING UNIT ASSEMBLY ................87                          .
   SYSTEM DESCRIPTION ................................... 50                 .          Components ...........................................................87 .
   COMPONENT DESCRIPTION ........................... 50                      .          Removal and Installation ........................................87      .
   DIAGNOSTIC PROCEDURE FOR AIR MIX                                                       REMOVAL ...........................................................87  .
   DOOR MOTOR (FRONT) ................................... 51                 .            INSTALLATION ...................................................88     .
 Intake Door Motor Circuit ....................................... 53        .        HEATER CORE ........................................................89     .
   INSPECTION FLOW .......................................... 53             .          Components ...........................................................89 .
   SYSTEM DESCRIPTION ................................... 54                 .          Removal and Installation ........................................89      .
   COMPONENT DESCRIPTION ........................... 54                      .            REMOVAL ...........................................................89  .
   DIAGNOSTIC PROCEDURE FOR INTAKE                                                        INSTALLATION ...................................................89     .
   DOOR MOTOR .................................................. 55          .        INTAKE DOOR MOTOR ...........................................90            .
 Front Blower Motor Circuit ..................................... 57         .          Removal and Installation ........................................90      .
   INSPECTION FLOW .......................................... 57             .            REMOVAL ...........................................................90  .
   SYSTEM DESCRIPTION ................................... 58                 .            INSTALLATION ...................................................90     .
   COMPONENT DESCRIPTION ........................... 58                      .        MODE DOOR MOTOR .............................................91            .
   DIAGNOSTIC PROCEDURE FOR BLOWER                                                      Removal and Installation ........................................91      .
   MOTOR .............................................................. 59   .            REMOVAL ...........................................................91  .
   COMPONENT INSPECTION ............................. 63                     .            INSTALLATION ...................................................91     .
 Magnet Clutch Circuit ............................................ 65       .        AIR MIX DOOR MOTOR ..........................................92            .
   INSPECTION FLOW .......................................... 65             .          Components ...........................................................92 .
   SYSTEM DESCRIPTION ................................... 66                 .          Removal and Installation ........................................92      .
   DIAGNOSTIC PROCEDURE FOR MAGNET                                                        REMOVAL ...........................................................92  .
   CLUTCH ............................................................. 66   .            INSTALLATION ...................................................92     .
 Insufficient Cooling ................................................ 70    .        FRONT BLOWER MOTOR RESISTOR ...................93                          .
   INSPECTION FLOW .......................................... 70             .          Removal and Installation ........................................93      .
   PERFORMANCE TEST DIAGNOSES ............... 71                             .            REMOVAL ...........................................................93  .
   PERFORMANCE CHART .................................. 73                   .            INSTALLATION ...................................................93     .
   TROUBLE DIAGNOSES FOR UNUSUAL PRES-                                                DUCTS AND GRILLES ............................................94           .
   SURE .................................................................. 74.




Revision: November 2005                                                        MTC-2                                                           2005 Pathfinder
 Components .......................................................... 94 .          REMOVAL ........................................................ 105 .
 Removal and Installation ....................................... 95      .          INSTALLATION ................................................ 105    .       A
   CONSOLE DUCTS AND CONSOLE GRILLE ... 95                                         Removal and Installation for Low-pressure A/C Pipe 106                 .
   DEFROSTER NOZZLE ...................................... 96             .          REMOVAL ........................................................ 106 .
   RH AND LH SIDE DEMISTER DUCTS ............. 96                         .          INSTALLATION ................................................ 106    .       B
   RH AND LH VENTILATOR DUCTS ................... 96                      .        Removal and Installation for Refrigerant Pressure
   CENTER VENTILATOR DUCT .......................... 96                   .        Sensor ................................................................. 106
                                                                                                                                                          .
   FLOOR CONNECTOR DUCT ............................ 96                   .          REMOVAL ........................................................ 106 .
   FRONT AND REAR FLOOR DUCTS ................ 96                         .          INSTALLATION ................................................ 106    .       C
   GRILLES ............................................................ 97.        Removal and Installation for Condenser ............. 106               .
REFRIGERANT LINES ............................................ 98         .          REMOVAL ........................................................ 106 .
 HFC-134a (R-134a) Service Procedure ................ 98                  .          INSTALLATION ................................................ 107    .       D
   SETTING OF SERVICE TOOLS AND EQUIP-                                             Removal and Installation for Evaporator ............. 108              .
   MENT ................................................................. 98
                                                                          .          REMOVAL ........................................................ 109 .
 Components ........................................................ 100  .          INSTALLATION ................................................ 109    .       E
 Removal and Installation for Compressor ........... 101                  .        Removal and Installation for Expansion Valve ..... 109                 .
   COMPONENTS ............................................... 101         .          REMOVAL ........................................................ 109 .
   REMOVAL ........................................................ 101   .          INSTALLATION ................................................ 109    .
   INSTALLATION ................................................ 101      .        Checking for Refrigerant Leaks ........................... 109         .       F
 Removal and Installation for Compressor Clutch . 102                              Checking System for Leaks Using the Fluorescent
   REMOVAL ........................................................ 102   .        Dye Leak Detector ............................................... 109  .
   INSPECTION ................................................... 103     .        Dye Injection ........................................................ 110
                                                                                                                                                          .       G
   INSTALLATION ................................................ 103      .        Electronic Refrigerant Leak Detector ................... 110           .
   BREAK-IN OPERATION .................................. 105              .          PRECAUTIONS FOR HANDLING LEAK
 Removal and Installation for High-pressure Flexible                                 DETECTOR ...................................................... 110  .       H
 A/C Hose ............................................................. 105
                                                                          .          CHECKING PROCEDURE ...............................111                .
   REMOVAL ........................................................ 105   .       SERVICE DATA AND SPECIFICATIONS (SDS) ... 113                           .
   INSTALLATION ................................................ 105      .        Service Data and Specifications (SDS) ............... 113              .
                                                                                                                                                                   I
 Removal and Installation for High-pressure A/C                                      COMPRESSOR ............................................... 113       .
 Pipe ..................................................................... 105
                                                                          .          LUBRICANT ..................................................... 113  .
   REMOVAL ........................................................ 105   .          REFRIGERANT ................................................ 113     .
   INSTALLATION ................................................ 105      .          ENGINE IDLING SPEED ................................. 113            .       MTC
 Removal and Installation for Low-pressure Flexible                                  BELT TENSION ................................................ 113    .
 A/C Hose ............................................................. 105
                                                                          .
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                                                                                                                                                                  M




Revision: November 2005                                                    MTC-3                                                         2005 Pathfinder
                                              PRECAUTIONS

PRECAUTIONS                                                         PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                           EJS003UK


The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
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
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:
G    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.
G    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.
G    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.
Precautions for Working with HFC-134a (R-134a)                                                                EJS003UL


WARNING:
G CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
  are mixed compressor failure is likely to occur. Refer MTC-4, "Contaminated Refrigerant" . To
  determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant
  Recovery/Recycling Recharging equipment and Refrigerant Identifier.
G 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 failure is likely to occur.
G The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
  lowing handling precautions must be observed:



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