Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti FX45 FX35 2003-2005 Approved FX45_35-S50-2003 atc
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AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
A
SECTION
AUTOMATIC AIR CONDITIONER
ATC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 5
. GENERAL INFORMATION ................................ 22 . F
Precautions for Supplemental Restraint System DESCRIPTION ................................................... 23
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Component Layout ................................................ 26
.
SIONER" ................................................................. 5
. LUBRICANT ............................................................. 27
. G
Precautions for Working with HFC-134a (R-134a) 5 ..... Maintenance of Lubricant Quantity in Compressor 27 ...
CONTAMINATED REFRIGERANT ...................... 5 . LUBRICANT ....................................................... 27
.
General Refrigerant Precautions ............................. 7 . LUBRICANT RETURN OPERATION ................. 27 .
H
Lubricant Precautions ............................................. 7
. LUBRICANT ADJUSTING PROCEDURE FOR
Precautions for Refrigerant Connection .................. 8 . COMPONENTS REPLACEMENT EXCEPT
ABOUT ONE-TOUCH JOINT ............................... 8 . COMPRESSOR ................................................. 28 .
FEATURES OF NEW TYPE REFRIGERANT LUBRICANT ADJUSTING PROCEDURE FOR I
CONNECTION ................................................... 10 . COMPRESSOR REPLACEMENT ...................... 29 .
O-RING AND REFRIGERANT CONNECTION....11 AIR CONDITIONER CONTROL .............................. 30 .
Precautions for Servicing Compressor .................. 13 . Description of Air Conditioner LAN Control System 30 ... ATC
Precautions for Service Equipment ....................... 13 . System Construction ............................................. 30
.
RECOVERY/RECYCLING EQUIPMENT ........... 13 . OPERATION ....................................................... 30
.
ELECTRONIC LEAK DETECTOR ..................... 13 . TRANSMISSION DATA AND TRANSMISSION
K
VACUUM PUMP ................................................ 14 . ORDER .............................................................. 31
.
MANIFOLD GAUGE SET ................................... 14 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
SERVICE HOSES .............................................. 14 . PERATURE CONTROL) .................................... 32 .
SERVICE COUPLERS ....................................... 15 . FAN SPEED CONTROL ..................................... 32 . L
REFRIGERANT WEIGHT SCALE ..................... 15 . INTAKE DOOR CONTROL ................................ 32 .
CALIBRATING ACR4 WEIGHT SCALE ............. 15 . OUTLET DOOR CONTROL ............................... 32 .
CHARGING CYLINDER ..................................... 15 . MAGNET CLUTCH CONTROL .......................... 32 . M
Precautions for Leak Detection Dye ...................... 16 . SELF-DIAGNOSTIC SYSTEM ........................... 32 .
IDENTIFICATION ............................................... 16 . Description of Control System ............................... 33 .
IDENTIFICATION LABEL FOR VEHICLE .......... 16 . Control Operation .................................................. 33
.
Wiring Diagrams and Trouble Diagnosis ............... 16 . DISPLAY SCREEN ............................................. 34 .
PREPARATION ........................................................ 17
. AUTO SWITCH .................................................. 34.
Special Service Tools ............................................ 17
. TEMPERATURE SWITCH (POTENTIO TEM-
HFC-134a (R-134a) Service Tools and Equipment 18 ... PERATURE CONTROL) (DRIVER SIDE) .......... 34 .
Commercial Service Tools ..................................... 20 . TEMPERATURE SWITCH (POTENTIO TEM-
REFRIGERATION SYSTEM .................................... 21 . PERATURE CONTROL) (PASSENGER SIDE)... 34
Refrigerant Cycle .................................................. 21
. RECIRCULATION (REC) SWITCH .................... 34 .
REFRIGERANT FLOW ...................................... 21 . FRESH (FRE) SWITCH ..................................... 34 .
FREEZE PROTECTION .................................... 21 . DEFROSTER (DEF) SWITCH ............................ 34 .
Refrigerant System Protection .............................. 21 . REAR WINDOW DEFOGGER SWITCH ............ 34 .
REFRIGERANT PRESSURE SENSOR ............ 21 . OFF SWITCH ..................................................... 34
.
PRESSURE RELIEF VALVE .............................. 21 . A/C SWITCH ...................................................... 34
.
V-6 Variable Displacement Compressor ................ 22 . MODE SWITCH ................................................. 34 .
Revision; 2004 April ATC-1 2003 FX
FAN SWITCH ..................................................... 34 . COMPONENT DESCRIPTION ...........................85 .
DUAL SWITCH (WITH LEFT AND RIGHT VEN- DIAGNOSTIC PROCEDURE FOR MODE
TILATION TEMPERATURE SEPARATELY DOOR MOTOR ...................................................85 .
CONTROL SYSTEM) ......................................... 34 . Air Mix Door Motor Circuit ......................................86 .
Fail-safe Function .................................................. 35
. INSPECTION FLOW ...........................................86 .
Discharge Air Flow ................................................ 36 . SYSTEM DESCRIPTION ....................................87 .
System Description ................................................ 37 . COMPONENT DESCRIPTION ...........................88 .
SWITCHES AND THEIR CONTROL FUNCTION 37 ... DIAGNOSTIC PROCEDURE FOR AIR MIX
CAN Communication System Description ............. 38 . DOOR .................................................................88
.
CAN Communication Unit ...................................... 38 . Air Mix Door Motor PBR Circuit .............................88 .
TYPE 1/TYPE2 ................................................... 39 . DIAGNOSTIC PROCEDURE FOR AIR MIX
TYPE 3 ............................................................... 42
. DOOR PBR .........................................................88 .
TYPE 4/TYPE5 ................................................... 45 . Intake Door Motor Circuit .......................................89 .
TYPE 6 ............................................................... 48
. INSPECTION FLOW ...........................................89 .
TROUBLE DIAGNOSIS ........................................... 52 . SYSTEM DESCRIPTION ....................................90 .
CONSULT-II ........................................................... 52
. COMPONENT DESCRIPTION ...........................91 .
CONSULT-II BASIC OPERATION ...................... 52 . DIAGNOSTIC PROCEDURE FOR INTAKE
DATA MONITOR ................................................. 53 . DOOR MOTOR ...................................................91 .
How to Perform Trouble Diagnosis for Quick and Blower Motor Circuit ...............................................92 .
Accurate Repair ..................................................... 54
. INSPECTION FLOW ...........................................92 .
WORK FLOW ..................................................... 54 . SYSTEM DESCRIPTION ....................................93 .
SYMPTOM TABLE ............................................. 54 . COMPONENT DESCRIPTION ...........................94 .
Component Parts and Harness Connector Location 56 ... DIAGNOSTIC PROCEDURE FOR BLOWER
ENGINE COMPARTMENT ................................. 56 . MOTOR ...............................................................94.
PASSENGER COMPARTMENT ......................... 57 . COMPONENT INSPECTION ..............................97 .
Schematic .............................................................. 58
. Magnet Clutch Circuit .............................................98 .
Wiring Diagram --A/C-- ........................................ 59 . INSPECTION FLOW ...........................................98 .
Auto Amp. Terminals and Reference Value ........... 64 . SYSTEM DESCRIPTION ....................................99 .
PIN CONNECTOR TERMINAL LAYOUT ........... 64 . DIAGNOSTIC PROCEDURE FOR MAGNET
TERMINALS AND REFERENCE VALUE FOR CLUTCH .............................................................99 .
UNIFIED METER AND A/C AMP. ....................... 64 . COMPONENT INSPECTION ............................ 103 .
Self-diagnosis Function ......................................... 66 . Insufficient Cooling ............................................... 104 .
DESCRIPTION ................................................... 66 . INSPECTION FLOW ......................................... 104 .
FUNCTION CONFIRMATION PROCEDURE ..... 67 . PERFORMANCE TEST DIAGNOSES ............. 105 .
AUXILIARY MECHANISM: TEMPERATURE PERFORMANCE CHART ................................. 107 .
SETTING TRIMMER .......................................... 73 . TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
AUXILIARY MECHANISM: FOOT POSITION SURE ................................................................ 108
.
SETTING TRIMMER .......................................... 74 . DIAGNOSTIC PROCEDURE FOR INSUFFI-
AUXILIARY MECHANISM: INLET PORT MEM- CIENT COOLING .............................................. 110 .
ORY FUNCTION ................................................ 74 . Insufficient Heating .............................................. 112 .
Operational Check ................................................. 75 . INSPECTION FLOW ......................................... 112 .
CHECKING MEMORY FUNCTION .................... 75 . Noise .................................................................... 113
.
CHECKING BLOWER ........................................ 75 . INSPECTION FLOW ......................................... 113 .
CHECKING DISCHARGE AIR ........................... 75 . Self-diagnosis ...................................................... 114.
CHECKING RECIRCULATION ........................... 76 . INSPECTION FLOW ......................................... 114 .
CHECKING TEMPERATURE DECREASE ........ 76 . Memory Function ................................................. 115 .
CHECKING TEMPERATURE INCREASE ......... 76 . INSPECTION FLOW ......................................... 115 .
CHECK A/C SWITCH ......................................... 76 . Ambient Sensor Circuit ........................................ 116 .
CHECKING AUTO MODE .................................. 77 . COMPONENT DESCRIPTION ......................... 116 .
Power Supply and Ground Circuit for Auto Amp. ... 77 AMBIENT TEMPERATURE INPUT PROCESS . 116
INSPECTION FLOW .......................................... 77 . DIAGNOSTIC PROCEDURE FOR AMBIENT
COMPONENT DESCRIPTION ........................... 78 . SENSOR ........................................................... 116 .
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 78 ... COMPONENT INSPECTION ............................ 118 .
LAN System Circuit ............................................... 80 . In-vehicle Sensor Circuit ...................................... 119 .
DIAGNOSTIC PROCEDURE FOR LAN CIR- COMPONENT DESCRIPTION ......................... 119 .
CUIT ................................................................... 80
. DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
Mode Door Motor Circuit ....................................... 83 . SENSOR ........................................................... 120 .
INSPECTION FLOW .......................................... 83 . COMPONENT INSPECTION ............................ 121 .
SYSTEM DESCRIPTION ................................... 84 . Sunload Sensor Circuit ........................................ 122 .
Revision; 2004 April ATC-2 2003 FX
COMPONENT DESCRIPTION ........................ 122 . AIR MIX DOOR MOTOR ........................................ 143 .
SUNLOAD INPUT PROCESS ......................... 122 . Removal and Installation ..................................... 143 . A
DIAGNOSTIC PROCEDURE FOR SUNLOAD REMOVAL ........................................................ 143 .
SENSOR .......................................................... 122 . INSTALLATION ................................................ 143 .
COMPONENT INSPECTION ........................... 124 . HEATER CORE ...................................................... 144 . B
Intake Sensor Circuit ........................................... 125 . Removal and Installation ..................................... 144 .
COMPONENT DESCRIPTION ........................ 125 . REMOVAL ........................................................ 144 .
DIAGNOSTIC PROCEDURE FOR INTAKE SEN- INSTALLATION ................................................ 144 .
SOR ................................................................. 125
. DUCTS AND GRILLES .......................................... 145 . C
COMPONENT INSPECTION ........................... 126 . Removal and Installation ..................................... 145 .
CONTROLLER ...................................................... 127 . REMOVAL ........................................................ 145 .
Removal and Installation of A/C and AV Switch .. 127 . INSTALLATION ................................................ 148 . D
REMOVAL ........................................................ 127 . REFRIGERANT LINES .......................................... 149 .
INSTALLATION ................................................ 127 . HFC-134a (R-134a) Service Procedure .............. 149 .
AUTO AMP ............................................................ 128 . SETTING OF SERVICE TOOLS AND EQUIP- E
Removal and Installation of Unified Meter and A/C MENT ............................................................... 149
.
Amp. .................................................................... 128
. Components ........................................................ 151 .
REMOVAL ........................................................ 128 . VK45DE ............................................................ 151
.
INSTALLATION ................................................ 128 . VQ35DE ........................................................... 152. F
AMBIENT SENSOR ............................................... 129 . Removal and Installation of Compressor ............. 152 .
Removal and Installation ..................................... 129 . REMOVAL ........................................................ 152 .
REMOVAL ........................................................ 129 . INSTALLATION ................................................ 154 . G
INSTALLATION ................................................ 129 . Removal and Installation of Compressor Clutch . 155
IN-VEHICLE SENSOR ........................................... 130 . REMOVAL ........................................................ 155 .
Removal and Installation ..................................... 130 . INSTALLATION ................................................ 157 . H
REMOVAL ........................................................ 130 . Removal and Installation of Low-pressure Flexible
INSTALLATION ................................................ 130 . Hose .................................................................... 159
.
SUNLOAD SENSOR ............................................. 131 . REMOVAL ........................................................ 159 .
I
Removal and Installation ..................................... 131 . INSTALLATION ................................................ 160 .
REMOVAL ........................................................ 131 . Removal and Installation of High-pressure Flexible
INSTALLATION ................................................ 131 . Hose .................................................................... 160
.
INTAKE SENSOR .................................................. 132 . REMOVAL ........................................................ 160 . ATC
Removal and Installation ..................................... 132 . INSTALLATION ................................................ 161 .
REMOVAL ........................................................ 132 . Removal and Installation of Low-pressure Pipe 1
INSTALLATION ................................................ 133 . (Engine Compartment) ........................................ 161 . K
BLOWER UNIT ...................................................... 134 . REMOVAL ........................................................ 161 .
Removal and Installation ..................................... 134 . INSTALLATION ................................................ 162 .
REMOVAL ........................................................ 134 . Removal and Installation of High-pressure Pipe 1 L
INSTALLATION ................................................ 134 . and 2 (Engine Compartment) .............................. 162 .
Disassembly and Assembly ................................ 135 . REMOVAL ........................................................ 162 .
BLOWER MOTOR ................................................. 136 . INSTALLATION ................................................ 163 .
Removal and Installation ..................................... 136 . Removal and Installation of Low-pressure Pipe 2 M
REMOVAL ........................................................ 136 . and High-pressure Pipe 3 .................................... 163 .
INSTALLATION ................................................ 136 . REMOVAL ........................................................ 163 .
INTAKE DOOR MOTOR ........................................ 137 . INSTALLATION ................................................ 164 .
Removal and Installation ..................................... 137 . Removal and Installation of Liquid Tank .............. 165 .
REMOVAL ........................................................ 137 . REMOVAL ........................................................ 165 .
INSTALLATION ................................................ 137 . INSTALLATION ................................................ 165 .
HEATER & COOLING UNIT ASSEMBLY ............. 138 . Removal and Installation of Condenser ............... 166 .
Removal and Installation ..................................... 138 . REMOVAL ........................................................ 166 .
REMOVAL ........................................................ 138 . INSTALLATION ................................................ 166 .
INSTALLATION ................................................ 139 . Removal and Installation of Refrigerant Pressure
Disassembly and Assembly ................................ 140 . Sensor ................................................................. 167
.
MODE DOOR MOTOR .......................................... 142 . REMOVAL ........................................................ 167 .
Removal and Installation ..................................... 142 . INSTALLATION ................................................ 167 .
REMOVAL ........................................................ 142 . Removal and Installation of Evaporator ............... 167 .
INSTALLATION ................................................ 142 . REMOVAL ........................................................ 167 .
INSTALLATION ................................................ 167 .
Removal and Installation of Expansion Valve ...... 169 .
Revision; 2004 April ATC-3 2003 FX
REMOVAL ........................................................ 169
. DETECTOR ...................................................... 171 .
INSTALLATION ................................................. 169 . CHECKING PROCEDURE ............................... 172 .
Checking for Refrigerant Leaks ........................... 170 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 174 .
Checking System for Leaks Using the Fluorescent Compressor ......................................................... 174
.
Leak Detector ...................................................... 170
. Lubricant .............................................................. 174
.
Dye Injection ........................................................ 170
. Refrigerant ........................................................... 174
.
Electronic Refrigerant Leak Detector ................... 171 . Engine Idling Speed ............................................. 174 .
PRECAUTIONS FOR HANDLING LEAK Belt Tension ......................................................... 174
.
Revision; 2004 April ATC-4 2003 FX
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 (ACR4) (J-39500-INF) and Refrigerant I
Identifier.
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. ATC
q 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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