Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti G35 2003-2005 Coupe Sedan Approved Infiniti G35 Coupe 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
. V-6 Variable Displacement Compressor ................ 21 . F
Precautions for Supplemental Restraint System GENERAL INFORMATION ................................ 21 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- DESCRIPTION ................................................... 22
.
SIONER" ................................................................. 5
. Component Layout ................................................ 25
. G
Precautions for Battery Service ............................... 5 . LUBRICANT ............................................................. 26
.
Precautions for Working with HFC-134a (R-134a) 6 ..... Maintenance of Lubricant Quantity in Compressor 26 ...
CONTAMINATED REFRIGERANT ...................... 6 . LUBRICANT ....................................................... 26
.
H
General Refrigerant Precautions ............................. 7 . LUBRICANT RETURN OPERATION ................. 26 .
Lubricant Precautions ............................................. 7
. LUBRICANT ADJUSTING PROCEDURE FOR
Precautions for Refrigerant Connection .................. 7 . COMPONENTS REPLACEMENT EXCEPT
ABOUT ONE-TOUCH JOINT ............................... 7 . COMPRESSOR ................................................. 27 . I
FEATURES OF NEW TYPE REFRIGERANT LUBRICANT ADJUSTING PROCEDURE FOR
CONNECTION ................................................... 10 . COMPRESSOR REPLACEMENT ...................... 27 .
O-RING AND REFRIGERANT CONNECTION... 10 AIR CONDITIONER CONTROL .............................. 29 . ATC
Precautions for Servicing Compressor .................. 12 . Description of Air Conditioner LAN Control System 29 ...
Precautions for Service Equipment ....................... 12 . System Construction ............................................. 29
.
RECOVERY/RECYCLING EQUIPMENT ........... 12 . OPERATION ....................................................... 30
.
K
ELECTRONIC LEAK DETECTOR ..................... 12 . TRANSMISSION DATA AND TRANSMISSION
VACUUM PUMP ................................................ 13 . ORDER .............................................................. 30
.
MANIFOLD GAUGE SET ................................... 13 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
SERVICE HOSES .............................................. 13 . PERATURE CONTROL) .................................... 31 . L
SERVICE COUPLERS ....................................... 14 . FAN SPEED CONTROL ..................................... 31 .
REFRIGERANT WEIGHT SCALE ..................... 14 . INTAKE DOOR CONTROL ................................ 31 .
CALIBRATING ACR4 WEIGHT SCALE ............. 14 . OUTLET DOOR CONTROL ............................... 31 . M
CHARGING CYLINDER ..................................... 14 . MAGNET CLUTCH CONTROL .......................... 32 .
Precautions for Leak Detection Dye ...................... 15 . SELF-DIAGNOSTIC SYSTEM ........................... 32 .
IDENTIFICATION ............................................... 15 . Description of Control System ............................... 33 .
IDENTIFICATION LABEL FOR VEHICLE .......... 15 . Control Operation .................................................. 33
.
Wiring Diagrams and Trouble Diagnosis ............... 15 . DISPLAY SCREEN ............................................. 34 .
PREPARATION ........................................................ 16
. AUTO.ECON SWITCH ....................................... 34 .
Special Service Tools ............................................ 16
. TEMPERATURE SWITCH (POTENTIO TEM-
HFC-134a (R-134a) Service Tools and Equipment 17 ... PERATURE CONTROL) .................................... 34 .
Commercial Service Tools ..................................... 19 . RECIRCULATION (REC) SWITCH .................... 34 .
REFRIGERATION SYSTEM .................................... 20 . FRESH (FRE) SWITCH ..................................... 34 .
Refrigerant Cycle .................................................. 20
. DEFROSTER (DEF) SWITCH ............................ 34 .
REFRIGERANT FLOW ...................................... 20 . REAR WINDOW DEFOGGER SWITCH ............ 34 .
FREEZE PROTECTION .................................... 20 . OFF SWITCH ..................................................... 34
.
Refrigerant System Protection .............................. 20 . A/C SWITCH ...................................................... 34
.
REFRIGERANT PRESSURE SENSOR ............ 20 . MODE SWITCH ................................................. 34 .
PRESSURE RELIEF VALVE .............................. 20 . FAN SWITCHES ................................................ 34 .
Revision; 2004 April ATC-1 2003 G35 Coupe
DUAL SWITCH (WITH LEFT AND RIGHT VEN- Air Mix Door Motor Circuit ......................................77 .
TILATION TEMPERATURE SEPARATELY INSPECTION FLOW ...........................................78 .
CONTROL SYSTEM) ......................................... 34 . SYSTEM DESCRIPTION ....................................78 .
Fail-Safe Function ................................................. 35. COMPONENT DESCRIPTION ...........................79 .
Discharge Air Flow ................................................ 36 . DIAGNOSTIC PROCEDURE FOR AIR MIX
System Description ................................................ 37 . DOOR .................................................................80
.
SWITCHES AND THEIR CONTROL FUNCTION 37 ... Air Mix Door Motor PBR Circuit .............................80 .
CAN Communication System Description ............. 38 . DIAGNOSTIC PROCEDURE FOR AIR MIX
CAN Communication Unit ...................................... 38 . DOOR PBR .........................................................80 .
TYPE 1 ............................................................... 39
. Intake Door Motor Circuit .......................................81 .
TYPE 2 ............................................................... 40
. INSPECTION FLOW ...........................................81 .
TROUBLE DIAGNOSIS ........................................... 42 . SYSTEM DESCRIPTION ....................................82 .
CONSULT-II ........................................................... 42
. COMPONENT DESCRIPTION ...........................83 .
CONSULT-II BASIC OPERATION ...................... 42 . DIAGNOSTIC PROCEDURE FOR INTAKE
DATA MONITOR ................................................. 43 . DOOR MOTOR ...................................................83 .
How to Perform Trouble Diagnosis for Quick and Blower Motor Circuit ...............................................84 .
Accurate Repair ..................................................... 44
. INSPECTION FLOW ...........................................84 .
WORK FLOW ..................................................... 44 . SYSTEM DESCRIPTION ....................................85 .
SYMPTOM TABLE ............................................. 44 . COMPONENT DESCRIPTION ...........................86 .
Component Parts and Harness Connector Location 45 ... DIAGNOSTIC PROCEDURE FOR BLOWER
ENGINE COMPARTMENT ................................. 45 . MOTOR ...............................................................86.
PASSENGER COMPARTMENT ......................... 46 . COMPONENT INSPECTION ..............................88 .
Schematic .............................................................. 47
. Magnet Clutch Circuit .............................................89 .
Wiring Diagram --A/C-- ........................................ 48 . INSPECTION FLOW ...........................................89 .
Auto Amp. Terminals and Reference Value ........... 53 . SYSTEM DESCRIPTION ....................................90 .
PIN CONNECTOR TERMINAL LAYOUT ........... 53 . DIAGNOSTIC PROCEDURE FOR MAGNET
TERMINALS AND REFERENCE VALUE FOR CLUTCH .............................................................90 .
DISPLAY AND A/C AUTO AMP. ......................... 53 . COMPONENT INSPECTION ..............................95 .
Self-Diagnosis Function ......................................... 56 . Insufficient Cooling .................................................96 .
DESCRIPTION ................................................... 56 . INSPECTION FLOW ...........................................96 .
FUNCTION CONFIRMATION PROCEDURE ..... 57 . PERFORMANCE TEST DIAGNOSES ...............97 .
AUXILIARY MECHANISM: TEMPERATURE PERFORMANCE CHART ...................................99 .
SETTING TRIMMER .......................................... 63 . TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
AUXILIARY MECHANISM: FOOT POSITION SURE ................................................................ 100
.
SETTING TRIMMER .......................................... 64 . DIAGNOSTIC PROCEDURE FOR INSUFFI-
AUXILIARY MECHANISM: INLET PORT MEM- CIENT COOLING .............................................. 102 .
ORY FUNCTION ................................................ 64 . Insufficient Heating .............................................. 104 .
Operational Check ................................................. 65 . INSPECTION FLOW ......................................... 104 .
CHECKING MEMORY FUNCTION .................... 65 . Noise .................................................................... 104
.
CHECKING BLOWER ........................................ 65 . INSPECTION FLOW ......................................... 105 .
CHECKING DISCHARGE AIR ........................... 65 . Self-Diagnosis ...................................................... 105.
CHECKING RECIRCULATION ........................... 66 . INSPECTION FLOW ......................................... 106 .
CHECKING TEMPERATURE DECREASE ........ 66 . Memory Function ................................................. 107 .
CHECKING TEMPERATURE INCREASE ......... 66 . INSPECTION FLOW ......................................... 107 .
CHECK A/C SWITCH ......................................... 66 . Ambient Sensor Circuit ........................................ 107 .
CHECKING AUTO.ECON MODE ....................... 67 . COMPONENT DESCRIPTION ......................... 107 .
Power Supply and Ground Circuit for Auto Amp. ... 68 AMBIENT TEMPERATURE INPUT PROCESS .108
INSPECTION FLOW .......................................... 68 . DIAGNOSTIC PROCEDURE FOR AMBIENT
COMPONENT DESCRIPTION ........................... 69 . SENSOR ........................................................... 108 .
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 69 ... COMPONENT INSPECTION ............................ 109 .
LAN System Circuit ............................................... 71 . In-Vehicle Sensor Circuit ...................................... 110 .
DIAGNOSTIC PROCEDURE FOR LAN CIR- COMPONENT DESCRIPTION ......................... 110 .
CUIT ................................................................... 71
. DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
Mode Door Motor Circuit ....................................... 75 . SENSOR ........................................................... 111 .
INSPECTION FLOW .......................................... 75 . COMPONENT INSPECTION ............................ 112 .
SYSTEM DESCRIPTION ................................... 76 . Sunload Sensor Circuit ........................................ 112 .
COMPONENT DESCRIPTION ........................... 77 . COMPONENT DESCRIPTION ......................... 112 .
DIAGNOSTIC PROCEDURE FOR MODE SUNLOAD INPUT PROCESS .......................... 113 .
DOOR MOTOR .................................................. 77 . DIAGNOSTIC PROCEDURE FOR SUNLOAD
Revision; 2004 April ATC-2 2003 G35 Coupe
SENSOR ...........................................................113 . INSTALLATION ................................................ 133 .
COMPONENT INSPECTION ............................115 . Disassembly and Assembly ................................. 134 . A
Intake Sensor Circuit ............................................116 . MODE DOOR MOTOR ........................................... 136 .
COMPONENT DESCRIPTION .........................116 . Removal and Installation ..................................... 136 .
DIAGNOSTIC PROCEDURE FOR INTAKE SEN- REMOVAL ........................................................ 136 . B
SOR ..................................................................116
. INSTALLATION ................................................ 136 .
COMPONENT INSPECTION ............................117 . AIR MIX DOOR MOTOR ........................................ 137 .
Multiplex Communication Circuit ..........................118 . Removal and Installation ..................................... 137 .
DIAGNOSTIC PROCEDURE FOR MULTIPLEX REMOVAL ........................................................ 137 . C
COMMUNICATION ...........................................118 . INSTALLATION ................................................ 137 .
A/C AND AUDIO CONTROLLER .......................... 120 . DUCTS AND GRILLES .......................................... 138 .
Removal and Installation ..................................... 120 . Removal and Installation ..................................... 138 . D
REMOVAL ........................................................ 120 . REMOVAL ........................................................ 138 .
INSTALLATION ................................................ 120 . INSTALLATION ................................................ 140 .
Disassembly and Assembly ................................ 120 . REFRIGERANT LINES .......................................... 141 . E
AUTO AMP ............................................................ 121 . HFC-134a (R-134a) Service Procedure .............. 141 .
Removal and Installation of Display and A/C Auto SETTING OF SERVICE TOOLS AND EQUIP-
Amp. .................................................................... 121
. MENT ............................................................... 141
.
REMOVAL ........................................................ 121 . Components ........................................................ 143 . F
INSTALLATION ................................................ 121 . Removal and Installation of Compressor ............. 143 .
Disassembly and Assembly ................................ 121 . REMOVAL ........................................................ 143 .
AMBIENT SENSOR ............................................... 122 . INSTALLATION ................................................ 144 . G
Removal and Installation ..................................... 122 . Removal and Installation of Compressor Clutch . 145
REMOVAL ........................................................ 122 . REMOVAL ........................................................ 145 .
INSTALLATION ................................................ 122 . INSTALLATION ................................................ 147 . H
IN-VEHICLE SENSOR ........................................... 123 . Removal and Installation of Low-pressure Flexible
Removal and Installation ..................................... 123 . Hose .................................................................... 148
.
REMOVAL ........................................................ 123 . REMOVAL ........................................................ 148 .
I
INSTALLATION ................................................ 123 . INSTALLATION ................................................ 148 .
SUNLOAD SENSOR ............................................. 124 . Removal and Installation of High-pressure Flexible
Removal and Installation ..................................... 124 . Hose .................................................................... 149
.
REMOVAL ........................................................ 124 . REMOVAL ........................................................ 149 . ATC
INSTALLATION ................................................ 124 . INSTALLATION ................................................ 149 .
INTAKE SENSOR .................................................. 125 . Removal and Installation of Low-pressure Pipe 1
Removal and Installation ..................................... 125 . (Engine Compartment) ........................................ 150 . K
REMOVAL ........................................................ 125 . REMOVAL ........................................................ 150 .
INSTALLATION ................................................ 126 . INSTALLATION ................................................ 150 .
BLOWER UNIT ...................................................... 127 . Removal and Installation of High-pressure Pipe 1 L
Removal and Installation ..................................... 127 . (Engine Compartment) ........................................ 151 .
REMOVAL ........................................................ 127 . REMOVAL ........................................................ 151 .
INSTALLATION ................................................ 127 . INSTALLATION ................................................ 151 .
Disassembly and Assembly ................................ 128 . Removal and Installation of Low-pressure Pipe 2 M
BLOWER MOTOR ................................................. 129 . and High-pressure Pipe 2 .................................... 152 .
Removal and Installation ..................................... 129 . REMOVAL ........................................................ 152 .
REMOVAL ........................................................ 129 . INSTALLATION ................................................ 153 .
INSTALLATION ................................................ 129 . Removal and Installation of Liquid Tank .............. 153 .
INTAKE DOOR MOTOR ........................................ 130 . REMOVAL ........................................................ 153 .
Removal and Installation ..................................... 130 . INSTALLATION ................................................ 154 .
REMOVAL ........................................................ 130 . Removal and Installation of Condenser ............... 154 .
INSTALLATION ................................................ 130 . REMOVAL ........................................................ 154 .
IN-CABIN MICROFILTER ...................................... 131 . INSTALLATION ................................................ 155 .
Removal and Installation ..................................... 131 . Removal and Installation of Refrigerant Pressure
FUNCTION ....................................................... 131 . Sensor ................................................................. 156
.
REPLACEMENT TIMING ................................. 131 . REMOVAL ........................................................ 156 .
REPLACEMENT PROCEDURES .................... 131 . INSTALLATION ................................................ 156 .
HEATER & COOLING UNIT ASSEMBLY ............. 132 . Removal and Installation of Evaporator ............... 156 .
Removal and Installation ..................................... 132 . REMOVAL ........................................................ 156 .
REMOVAL ........................................................ 132 . INSTALLATION ................................................ 156 .
Removal and Installation of Expansion Valve ...... 157 .
Revision; 2004 April ATC-3 2003 G35 Coupe
REMOVAL ........................................................ 157
. DETECTOR ...................................................... 159 .
INSTALLATION ................................................. 157 . CHECKING PROCEDURE ............................... 160 .
Checking for Refrigerant Leaks ........................... 157 . 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 April ATC-4 2003 G35 Coupe
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" AJS000N2
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 Battery Service AJS000ST
Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the H
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.
I
ATC
K
L
M
Revision; 2004 April ATC-5 2003 G35 Coupe
PRECAUTIONS
Precautions for Working with HFC-134a (R-134a) AJS000N3
WARNING:
q CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
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
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.
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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