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  • ATC-1

    AUTOMATIC AIR CONDITIONER

    J AIR CONDITIONER

    CONTENTS

    C

    D

    E

    F

    G

    H

    I

    K

    L

    M

    SECTION ATCA

    B

    ATC

    Revision: 2005 August 2005 Murano

    AUTOMATIC AIR CONDITIONER

    PRECAUTIONS .......................................................... 5Precautions for Supplemental Restraint System (SRS) AIR BAG and SEAT BELT PRE-TEN-SIONER .................................................................. 5Precautions Necessary for Steering Wheel Rotation After Battery Disconnect .......................................... 5

    OPERATION PROCEDURE ................................. 5Precautions for Procedures without Cowl Top Cover ..... 6Precautions for Working with HFC-134a (R-134a) ..... 6

    CONTAMINATED REFRIGERANT ....................... 6General Refrigerant Precautions .............................. 7Precautions for Refrigerant Connection ................... 8

    ABOUT ONE-TOUCH JOINT ................................ 8FEATURES OF NEW TYPE REFRIGERANT CONNECTION .................................................... 10O-RING AND REFRIGERANT CONNECTION ....11

    Precautions for Servicing Compressor ................... 13Precautions for Service Equipment ........................ 13

    RECOVERY / RECYCLING EQUIPMENT .......... 13ELECTRONIC LEAK DETECTOR ...................... 13VACUUM PUMP ................................................. 13MANIFOLD GAUGE SET .................................... 13SERVICE HOSES ............................................... 14SERVICE COUPLERS ........................................ 14REFRIGERANT WEIGHT SCALE ...................... 14CHARGING CYLINDER ...................................... 14

    Precautions for Leak Detection Dye ....................... 15IDENTIFICATION ................................................ 15IDENTIFICATION LABEL FOR VEHICLE ........... 15

    PREPARATION ......................................................... 16Special Service Tools ............................................. 16HFC-134a (R-134a) Service Tools and Equipment ... 17Commercial Service Tools ...................................... 19

    REFRIGERATION SYSTEM ..................................... 20Refrigerant Cycle ................................................... 20

    REFRIGERANT FLOW ....................................... 20FREEZE PROTECTION ..................................... 20

    Refrigerant System Protection ............................... 20REFRIGERANT PRESSURE SENSOR ............. 20

    PRESSURE RELIEF VALVE ............................... 20Component Layout ................................................. 21

    LUBRICANT .............................................................. 22Maintenance of Lubricant Quantity in Compressor ... 22

    LUBRICANT ........................................................ 22LUBRICANT RETURN OPERATION .................. 22LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT EXCEPT COMPRESSOR .................................................. 23LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT ....................... 23

    AIR CONDITIONER CONTROL ............................... 25Description of Air Conditioner LAN Control System ... 25System Construction .............................................. 25

    OPERATION ........................................................ 25TRANSMISSION DATA AND TRANSMISSION ORDER ............................................................... 26AIR MIX DOOR CONTROL (AUTOMATIC TEM-PERATURE CONTROL) ..................................... 27FAN SPEED CONTROL ...................................... 27INTAKE DOOR CONTROL ................................. 27MODE DOOR CONTROL ................................... 27MAGNET CLUTCH CONTROL ........................... 28SELF-DIAGNOSIS SYSTEM .............................. 28

    Description of Control System ................................ 29Control Operation ................................................... 29

    DISPLAY SCREEN .............................................. 29AUTO SWITCH ................................................... 30TEMPERATURE CONTROL DIAL (POTENTIO TEMPERATURE CONTROL) (DRIVER SIDE) ... 30TEMPERATURE CONTROL DIAL (POTENTIO TEMPERATURE CONTROL) (PASSENGER SIDE) ................................................................... 30RECIRCULATION (REC) SWITCH ..................... 30FRESH (FRE) SWITCH ...................................... 30DEFROSTER (DEF) SWITCH ............................. 30REAR WINDOW DEFOGGER SWITCH ............. 30OFF SWITCH ...................................................... 30A/C SWITCH ....................................................... 30MODE SWITCH .................................................. 30

  • ATC-2Revision: 2005 August 2005 Murano

    FAN CONTROL DIAL .......................................... 30DUAL SWITCH (WITH LEFT AND RIGHT VEN-TILATION TEMPERATURE SEPARATELY CONTROL SYSTEM) .......................................... 30

    Fail-safe Function ................................................... 31Discharge Air Flow ................................................. 32System Description ................................................. 33

    SWITCHES AND THEIR CONTROL FUNCTION ... 33CAN Communication System Description .............. 34

    TROUBLE DIAGNOSIS ............................................ 35CONSULT-II Function (BCM) .................................. 35

    CONSULT-II BASIC OPERATION ....................... 35DATA MONITOR .................................................. 36

    How to Perform Trouble Diagnosis for Quick and Accurate Repair ...................................................... 37

    WORK FLOW ...................................................... 37SYMPTOM TABLE .............................................. 37

    Component Parts and Harness Connector Location ... 38ENGINE COMPARTMENT .................................. 38PASSENGER COMPARTMENT .......................... 39

    Schematic ............................................................... 40Wiring Diagram A/C ......................................... 41Auto Amp. Terminals and Reference Value ............ 46

    PIN CONNECTOR TERMINAL LAYOUT ............ 46TERMINALS AND REFERENCE VALUE FOR UNIFIED METER AND A/C AMP. ........................ 46

    Self-diagnosis Function .......................................... 48DESCRIPTION .................................................... 48FUNCTION CONFIRMATION PROCEDURE ...... 49AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER ........................................... 54AUXILIARY MECHANISM: FOOT POSITION SETTING TRIMMER ........................................... 55AUXILIARY MECHANISM: INLET PORT MEM-ORY FUNCTION ................................................. 55

    Operational Check .................................................. 56CHECKING MEMORY FUNCTION ..................... 56CHECKING BLOWER ......................................... 56CHECKING DISCHARGE AIR ............................ 56CHECKING INTAKE AIR ..................................... 57CHECKING TEMPERATURE DECREASE ......... 57CHECKING TEMPERATURE INCREASE .......... 57CHECK A/C SWITCH .......................................... 57CHECKING AUTO MODE ................................... 58

    Power Supply and Ground Circuit for Auto Amp. ... 58INSPECTION FLOW ........................................... 58COMPONENT DESCRIPTION ............................ 59DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 59

    LAN System Circuit ................................................ 61DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 61

    Mode Door Motor Circuit ........................................ 65INSPECTION FLOW ........................................... 65SYSTEM DESCRIPTION .................................... 66COMPONENT DESCRIPTION ............................ 67DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR ............................................................... 67

    Air Mix Door Motor Circuit ...................................... 68INSPECTION FLOW ........................................... 68SYSTEM DESCRIPTION .................................... 69

    COMPONENT DESCRIPTION ............................70DIAGNOSIS PROCEDURE FOR AIR MIX DOOR ...70

    Air Mix Door Motor PBR Circuit ..............................70DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR .......................................................70

    Intake Door Motor Circuit ........................................71INSPECTION FLOW ............................................71SYSTEM DESCRIPTION .....................................72COMPONENT DESCRIPTION ............................73DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR ................................................................73

    Blower Motor Circuit ................................................74INSPECTION FLOW ............................................74SYSTEM DESCRIPTION .....................................75COMPONENT DESCRIPTION ............................76DIAGNOSIS PROCEDURE FOR BLOWER MOTOR ................................................................76COMPONENT INSPECTION ...............................78

    Magnet Clutch Circuit ..............................................79INSPECTION FLOW ............................................79SYSTEM DESCRIPTION .....................................80DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH ..............................................................80COMPONENT INSPECTION ...............................84

    Insufficient Cooling ..................................................85INSPECTION FLOW ............................................85PERFORMANCE TEST DIAGNOSIS ..................87PERFORMANCE CHART ....................................89TROUBLE DIAGNOSIS FOR UNUSUAL PR

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