Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2005_Q45 atc
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AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
A
SECTION
AUTOMATIC AIR CONDITIONER
ATC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 5
. DESCRIPTION ................................................... 20
. F
Precautions for Supplemental Restraint System Component Layout ................................................ 23
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- LUBRICANT ............................................................. 24
.
SIONER" ................................................................. 5
. Maintenance of Lubricant Quantity in Compressor 24 ... G
Precautions for Working with HFC-134a (R-134a) 5 ..... LUBRICANT ....................................................... 24
.
CONTAMINATED REFRIGERANT ...................... 6 . LUBRICANT RETURN OPERATION ................. 24 .
General Refrigerant Precautions ............................. 6 . LUBRICANT ADJUSTING PROCEDURE FOR
H
Lubricant Precautions ............................................. 6
. COMPONENTS REPLACEMENT EXCEPT
Precautions for Refrigerant Connection .................. 7 . COMPRESSOR ................................................. 25 .
FEATURES OF NEW TYPE REFRIGERANT LUBRICANT ADJUSTING PROCEDURE FOR
CONNECTION ..................................................... 7. COMPRESSOR REPLACEMENT ...................... 25 . I
O-RING AND REFRIGERANT CONNECTION..... 8 AIR CONDITIONER CONTROL .............................. 27 .
Precautions for Servicing Compressor .................. 10 . Description of Air Conditioner LAN Control System 27 ...
Precautions for Service Equipment ....................... 10 . System Construction ............................................. 27
. ATC
RECOVERY/RECYCLING EQUIPMENT ........... 10 . OPERATION ....................................................... 28
.
ELECTRONIC LEAK DETECTOR ..................... 10 . TRANSMISSION DATA AND TRANSMISSION
VACUUM PUMP .................................................11 . ORDER .............................................................. 28
.
K
MANIFOLD GAUGE SET ....................................11 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
SERVICE HOSES ...............................................11 . PERATURE CONTROL) .................................... 29 .
SERVICE COUPLERS ....................................... 12 . FAN SPEED CONTROL ..................................... 29 .
REFRIGERANT WEIGHT SCALE ..................... 12 . INTAKE DOOR CONTROL ................................ 29 . L
CHARGING CYLINDER ..................................... 12 . OUTLET DOOR CONTROL ............................... 29 .
Precautions for Leak Detection Dye ...................... 13 . MAGNET CLUTCH CONTROL .......................... 30 .
IDENTIFICATION ............................................... 13 . SELF-DIAGNOSTIC SYSTEM ........................... 30 . M
IDENTIFICATION LABEL FOR VEHICLE .......... 13 . Description of Control System ............................... 31 .
Wiring Diagrams and Trouble Diagnosis ............... 13 . Control Operation .................................................. 32
.
PREPARATION ........................................................ 14
. DISPLAY SCREEN ............................................. 32 .
Special Service Tools ............................................ 14
. AUTO SWITCH (DRIVER SIDE) ........................ 32 .
HFC-134a (R-134a) Service Tools and Equipment 14 ... AUTO SWITCH (PASSENGER SIDE) ............... 32 .
Commercial Service Tools ..................................... 17 . TEMPERATURE DIAL (POTENTIO TEMPERA-
REFRIGERATION SYSTEM .................................... 18 . TURE CONTROL) (DRIVER SIDE) .................... 32 .
Refrigerant Cycle .................................................. 18
. TEMPERATURE DIAL (POTENTIO TEMPERA-
REFRIGERANT FLOW ...................................... 18 . TURE CONTROL) (PASSENGER SIDE) ........... 32 .
FREEZE PROTECTION .................................... 18 . INTAKE SWITCH ................................................ 33.
Refrigerant System Protection .............................. 18 . DEFROSTER (DEF) SWITCH ............................ 33 .
REFRIGERANT PRESSURE SENSOR ............ 18 . OFF SWITCH ..................................................... 33
.
PRESSURE RELIEF VALVE .............................. 18 . MODE SWITCH (DRIVER SIDE) ....................... 33 .
V-6 Variable Displacement Compressor ................ 19 . MODE SWITCH (PASSENGER SIDE) ............... 33 .
GENERAL INFORMATION ................................ 19 . ECON (ECONOMY) SWITCH ............................ 33 .
FAN SWITCH ..................................................... 33
.
Edition; 2004 May ATC-1 2005 Q45
DUAL SWITCH ................................................... 33 . DIAGNOSTIC PROCEDURE FOR INTAKE
Fail-safe Function .................................................. 33
. DOOR MOTOR ...................................................79 .
Discharge Air Flow ................................................ 34 . Rear Ventilator Door Motor ....................................79 .
System Description ................................................ 35 . COMPONENT DESCRIPTION ...........................79 .
SWITCHES AND THEIR CONTROL FUNCTION 35 ... DIAGNOSTIC PROCEDURE FOR REAR VEN-
TROUBLE DIAGNOSIS ........................................... 36 . TILATOR DOOR MOTOR ...................................79 .
How to Perform Trouble Diagnoses for Quick and Rear control switch ................................................80 .
Accurate Repair ..................................................... 36
. DIAGNOSTIC PROCEDURE FOR REAR CON-
WORK FLOW ..................................................... 36 . TROL SWITCH ...................................................80 .
SYMPTOM TABLE ............................................. 36 . Blower Motor Circuit ...............................................81 .
Component Parts and Harness Connector Location 38 ... INSPECTION FLOW ...........................................81 .
ENGINE COMPARTMENT ................................. 38 . SYSTEM DESCRIPTION ....................................82 .
PASSENGER COMPARTMENT ......................... 39 . COMPONENT DESCRIPTION ...........................83 .
Schematic .............................................................. 40
. DIAGNOSTIC PROCEDURE FOR BLOWER
Wiring Diagram --A/C-- ........................................ 41 . MOTOR ...............................................................83.
Auto Amp. Terminals and Reference Value ........... 50 . COMPONENT INSPECTION ..............................85 .
PIN CONNECTOR TERMINAL LAYOUT ........... 50 . Magnet Clutch Circuit .............................................86 .
TERMINALS AND REFERENCE VALUE FOR INSPECTION FLOW ...........................................86 .
AUTO AMP. ........................................................ 50. SYSTEM DESCRIPTION ....................................87 .
Self-diagnosis Function ......................................... 53 . DIAGNOSTIC PROCEDURE FOR MAGNET
DESCRIPTION ................................................... 53 . CLUTCH .............................................................87 .
FUNCTION CONFIRMATION PROCEDURE ..... 54 . COMPONENT INSPECTION ..............................92 .
AUXILIARY MECHANISM: TEMPERATURE Insufficient Cooling .................................................93 .
SETTING TRIMMER .......................................... 61 . INSPECTION FLOW ...........................................93 .
Operational Check ................................................. 62 . PERFORMANCE TEST DIAGNOSIS .................95 .
CHECKING MEMORY FUNCTION .................... 62 . PERFORMANCE CHART ...................................97 .
CHECKING BLOWER ........................................ 62 . TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
CHECKING DISCHARGE AIR ........................... 62 . SURE ..................................................................98
.
CHECKING RECIRCULATION ........................... 63 . DIAGNOSTIC PROCEDURE FOR INSUFFI-
CHECKING TEMPERATURE DECREASE ........ 63 . CIENT COOLING .............................................. 100 .
CHECKING TEMPERATURE INCREASE ......... 64 . Insufficient Heating .............................................. 102 .
CHECK ECON (ECONOMY) MODE .................. 64 . INSPECTION FLOW ......................................... 102 .
CHECKING AUTO MODE .................................. 64 . Noise .................................................................... 103
.
Power Supply and Ground Circuit for Auto Amp. ... 65 INSPECTION FLOW ......................................... 103 .
INSPECTION FLOW .......................................... 65 . Self-diagnosis ...................................................... 104.
COMPONENT DESCRIPTION ........................... 65 . INSPECTION FLOW ......................................... 104 .
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 66 ... Memory Function ................................................. 105 .
LAN System Circuit ............................................... 67 . INSPECTION FLOW ......................................... 105 .
DIAGNOSTIC PROCEDURE FOR LAN CIR- ECON (ECONOMY) MODE ................................. 106 .
CUIT ................................................................... 67
. INSPECTION FLOW ......................................... 106 .
Mode Door Motor Circuit ....................................... 71 . A/C Display is Malfunctioning .............................. 107 .
INSPECTION FLOW .......................................... 71 . DIAGNOSTIC PROCEDURE ............................ 107 .
SYSTEM DESCRIPTION ................................... 72 . A/C Operation is Malfunctioning .......................... 108 .
COMPONENT DESCRIPTION ........................... 73 . DIAGNOSTIC PROCEDURE ............................ 108 .
DIAGNOSTIC PROCEDURE FOR MODE Ambient Sensor Circuit ........................................ 110 .
DOOR MOTOR .................................................. 73 . COMPONENT DESCRIPTION ......................... 110 .
Air Mix Door Motor Circuit ..................................... 74 . AMBIENT TEMPERATURE INPUT PROCESS . 110
INSPECTION FLOW .......................................... 74 . DIAGNOSTIC PROCEDURE FOR AMBIENT
SYSTEM DESCRIPTION ................................... 75 . SENSOR ........................................................... 110 .
COMPONENT DESCRIPTION ........................... 76 . COMPONENT INSPECTION ............................ 112 .
DIAGNOSTIC PROCEDURE FOR AIR MIX In-vehicle Sensor Circuit ...................................... 112 .
DOOR MOTOR .................................................. 76 . COMPONENT DESCRIPTION ......................... 112 .
Air Mix Door Motor PBR Circuit ............................. 76 . DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
DIAGNOSTIC PROCEDURE FOR AIR MIX SENSOR ........................................................... 113 .
DOOR MOTOR PBR .......................................... 76 . COMPONENT INSPECTION ............................ 114 .
Intake Door Motor Circuit ....................................... 77 . Sunload Sensor Circuit ........................................ 115 .
INSPECTION FLOW .......................................... 77 . COMPONENT DESCRIPTION ......................... 115 .
SYSTEM DESCRIPTION ................................... 78 . SUNLOAD INPUT PROCESS .......................... 115 .
COMPONENT DESCRIPTION ........................... 79 . DIAGNOSTIC PROCEDURE FOR SUNLOAD
Edition; 2004 May ATC-2 2005 Q45
SENSOR ...........................................................115
. HEATER CORE ...................................................... 139 .
COMPONENT INSPECTION ............................117 . Removal and Installation ..................................... 139 . A
Intake Sensor Circuit ............................................118 . REMOVAL ........................................................ 139 .
COMPONENT DESCRIPTION .........................118 . INSTALLATION ................................................ 139 .
DIAGNOSTIC PROCEDURE FOR INTAKE SEN- MODE DOOR MOTOR ........................................... 140 . B
SOR ..................................................................118
. Removal and Installation ..................................... 140 .
COMPONENT INSPECTION ............................119 . REMOVAL ........................................................ 140 .
Multiplex Communication Circuit ......................... 120 . INSTALLATION ................................................ 140 .
DIAGNOSTIC PROCEDURE FOR MULTIPLEX AIR MIX DOOR MOTOR ........................................ 141 . C
COMMUNICATION CIRCUIT (FRONT CON- Removal and Installation ..................................... 141 .
TROLLER) ....................................................... 120. REMOVAL ........................................................ 141 .
DIAGNOSTIC PROCEDURE FOR MULTIPLEX INSTALLATION ................................................ 141 . D
COMMUNICATION CIRCUIT (REAR CONTROL REAR VENTILATOR DOOR MOTOR .................... 142 .
SWITCH) .......................................................... 123
. Removal and Installation ..................................... 142 .
CONTROL UNIT .................................................... 125 . REMOVAL ........................................................ 142 . E
Removal and Installation of Multifunction Switch . 125 INSTALLATION ................................................ 142 .
REMOVAL ........................................................ 125. DUCTS AND GRILLES .......................................... 143 .
INSTALLATION ................................................ 125 . Removal and Installation ..................................... 143 .
AMBIENT SENSOR ............................................... 126 . REMOVAL ........................................................ 143 . F
Removal and Installation ..................................... 126 . INSTALLATION ................................................ 146 .
REMOVAL ........................................................ 126. REFRIGERANT LINES .......................................... 147 .
INSTALLATION ................................................ 126 . HFC-134a (R-134a) Service Procedure .............. 147 . G
IN-VEHICLE SENSOR ........................................... 127 . SETTING OF SERVICE TOOLS AND EQUIP-
Removal and Installation ..................................... 127 . MENT ............................................................... 147
.
REMOVAL ........................................................ 127. Components ........................................................ 149 . H
INSTALLATION ................................................ 127 . Removal and Installation of Compressor ............. 150 .
SUNLOAD SENSOR ............................................. 128 . REMOVAL ........................................................ 150 .
Removal and Installation ..................................... 128 . INSTALLATION ................................................ 151 .
I
REMOVAL ........................................................ 128. Removal and Installation of Compressor Clutch . 151
INSTALLATION ................................................ 128 . REMOVAL ........................................................ 151 .
INTAKE SENSOR .................................................. 129 . INSTALLATION ................................................ 153 .
Removal and Installation ..................................... 129 . Removal and Installation of Low-Pressure Flexible ATC
REMOVAL ........................................................ 129. Hose and Pipe ..................................................... 154 .
INSTALLATION ................................................ 129 . REMOVAL ........................................................ 154 .
BLOWER UNIT ...................................................... 130 . INSTALLATION ................................................ 155 . K
Removal and Installation ..................................... 130 . Removal and Installation of High-Pressure Flexible
REMOVAL ........................................................ 130. Hose .................................................................... 155
.
INSTALLATION ................................................ 130 . REMOVAL ........................................................ 155 . L
Disassembly and Assembly ................................ 131 . INSTALLATION ................................................ 155 .
BLOWER MOTOR ................................................. 132 . Removal and Installation of High-Pressure Pipe . 156
Removal and Installation ..................................... 132 . REMOVAL ........................................................ 156 .
REMOVAL ........................................................ 132. INSTALLATION ................................................ 156 . M
INSTALLATION ................................................ 132 . Removal and Installation of Refrigerant Pressure
INTAKE DOOR MOTOR ........................................ 133 . Sensor ................................................................. 157
.
Removal and Installation ..................................... 133 . REMOVAL ........................................................ 157 .
REMOVAL ........................................................ 133. INSTALLATION ................................................ 157 .
INSTALLATION ................................................ 133 . Removal and Installation of Condenser ............... 157 .
IN-CABIN MICROFILTER ...................................... 134 . REMOVAL ........................................................ 157 .
Removal and Installation ..................................... 134 . INSTALLATION ................................................ 158 .
FUNCTION ....................................................... 134. Removal and Installation of Liquid Tank .............. 159 .
REPLACEMENT TIMING ................................. 134 . REMOVAL ........................................................ 159 .
REPLACEMENT PROCEDURES .................... 134 . INSTALLATION ................................................ 159 .
HEATER & COOLING UNIT ASSEMBLY ............. 135 . Removal and Installation of Evaporator ............... 159 .
Removal and Installation ..................................... 135 . REMOVAL ........................................................ 159 .
REMOVAL ........................................................ 135. INSTALLATION ................................................ 160 .
INSTALLATION ................................................ 136 . Removal and Installation of Expansion Valve ...... 161 .
Disassembly and Assembly ................................ 137 . REMOVAL ........................................................ 161 .
INSTALLATION ................................................ 161 .
Checking for Refrigerant Leaks ........................... 161 .
Edition; 2004 May ATC-3 2005 Q45
Checking System for Leaks Using the Fluorescent SERVICE DATA AND SPECIFICATIONS (SDS) ... 165 .
Leak Detector ...................................................... 162
. Compressor ......................................................... 165
.
Dye Injection ........................................................ 162
. Lubricant .............................................................. 165
.
Electronic Refrigerant Leak Detector ................... 162 . Refrigerant ........................................................... 165
.
PRECAUTIONS FOR HANDLING LEAK Engine Idling Speed ............................................. 165 .
DETECTOR ...................................................... 162. Belt Tension ......................................................... 165
.
CHECKING PROCEDURE ............................... 163 .
Edition; 2004 May ATC-4 2005 Q45
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS0022V
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) EJS0008R
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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