Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2002_Q45 atc
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AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
A
SECTION
AUTOMATIC AIR CONDITIONER
ATC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 4
. GENERAL INFORMATION ................................ 18 . F
Precautions for Supplemental Restraint System DESCRIPTION ................................................... 18
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Component Layout ................................................ 21
.
SIONER" ................................................................. 4
. LUBRICANT ............................................................. 22
. G
Precautions for Working with HFC-134a (R-134a) 4 ..... Maintenance of Lubricant Quantity in Compressor 22 ...
CONTAMINATED REFRIGERANT ...................... 4 . LUBRICANT ....................................................... 22
.
General Refrigerant Precautions ............................. 5 . LUBRICANT RETURN OPERATION ................. 22 .
H
Lubricant Precautions ............................................. 5
. LUBRICANT ADJUSTING PROCEDURE FOR
Precautions for Refrigerant Connection .................. 5 . COMPONENTS REPLACEMENT EXCEPT
FEATURES OF NEW TYPE REFRIGERANT COMPRESSOR ................................................. 23 .
CONNECTION ..................................................... 5. LUBRICANT ADJUSTING PROCEDURE FOR I
O-RING AND REFRIGERANT CONNECTION..... 6 COMPRESSOR REPLACEMENT ...................... 23 .
Precautions for Servicing Compressor .................... 8 . AIR CONDITIONER CONTROL .............................. 25 .
Precautions for Service Equipment ......................... 8 . Overview Air Conditioner LAN Control System ..... 25 . ATC
RECOVERY/RECYCLING EQUIPMENT ............. 8 . System Construction ............................................. 25
.
ELECTRONIC LEAK DETECTOR ....................... 8 . OPERATION ....................................................... 25
.
VACUUM PUMP .................................................. 9 . TRANSMISSION DATA AND TRANSMISSION
K
MANIFOLD GAUGE SET ..................................... 9 . ORDER .............................................................. 26
.
SERVICE HOSES ................................................ 9 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
SERVICE COUPLERS ....................................... 10 . PERATURE CONTROL) .................................... 26 .
REFRIGERANT WEIGHT SCALE ..................... 10 . FAN SPEED CONTROL ..................................... 27 . L
CALIBRATING ACR4 WEIGHT SCALE ............. 10 . INTAKE DOOR CONTROL ................................ 27 .
CHARGING CYLINDER ..................................... 10 . OUTLET DOOR CONTROL ............................... 27 .
Precautions for Leak Detection Dye .......................11 . MAGNET CLUTCH CONTROL .......................... 27 . M
IDENTIFICATION ................................................11 . SELF-DIAGNOSTIC SYSTEM ........................... 27 .
IDENTIFICATION LABEL FOR VEHICLE ...........11 . Overview of Control System .................................. 27 .
Precautions for Leak Detection Dye ...................... 12 . Control Operation .................................................. 28
.
Wiring Diagrams and Trouble Diagnosis ............... 12 . DISPLAY SCREEN ............................................. 28 .
PREPARATION ........................................................ 13
. A/C SWITCH (DRIVER SIDE) ............................ 28 .
Special Service Tools ............................................ 13
. A/C SWITCH (PASSENGER SIDE) ................... 28 .
HFC-134a (R-134a) Service Tools and Equipment 13 ... TEMPERATURE DIAL (POTENTIO TEMPERA-
Commercial Service Tools ..................................... 16 . TURE CONTROL) (DRIVER SIDE) .................... 28 .
REFRIGERATION SYSTEM .................................... 17 . TEMPERATURE DIAL (POTENTIO TEMPERA-
Refrigerant Cycle .................................................. 17
. TURE CONTROL) (PASSENGER SIDE) ........... 28 .
REFRIGERANT FLOW ...................................... 17 . INTAKE SWITCH ................................................ 29.
FREEZE PROTECTION .................................... 17 . DEFROSTER (DEF) SWITCH ............................ 29 .
Refrigerant System Protection .............................. 17 . OFF SWITCH ..................................................... 29
.
REFRIGERANT PRESSURE SENSOR ............ 17 . MODE SWITCH (DRIVER SIDE) ....................... 29 .
PRESSURE RELIEF VALVE .............................. 17 . MODE SWITCH (PASSENGER SIDE) ............... 29 .
V-6 Variable Displacement Compressor ................ 18 . ECON (ECONOMY) SWITCH ............................ 29 .
Revision: 2004 April ATC-1 2002 Q45
FAN SWITCH ..................................................... 29
. COMPONENT DESCRIPTION ...........................78 .
DUAL SWITCH ................................................... 29
. DIAGNOSTIC PROCEDURE ..............................78 .
Discharge Air Flow ................................................ 30
. COMPONENT INSPECTION ..............................80 .
System Description ................................................ 31
. Magnet Clutch Circuit .............................................81 .
SWITCHES AND THEIR CONTROL FUNCTION 31 ... INSPECTION FLOW ...........................................81 .
TROUBLE DIAGNOSIS ........................................... 32 . SYSTEM DESCRIPTION ....................................82 .
How to Perform Trouble Diagnoses for Quick and DIAGNOSTIC PROCEDURE ..............................82 .
Accurate Repair ..................................................... 32
. COMPONENT INSPECTION ..............................85 .
WORK FLOW ..................................................... 32
. Insufficient Cooling .................................................86 .
SYMPTOM TABLE ............................................. 32 . INSPECTION FLOW ...........................................87 .
Component Parts and Harness Connector Location 33 ... PERFORMANCE TEST DIAGNOSES ...............88 .
ENGINE COMPARTMENT ................................. 33 . PERFORMANCE CHART ...................................90 .
PASSENGER COMPARTMENT ......................... 34 . TROUBLE DIAGNOSES FOR ABNORMAL
Circuit Diagram ...................................................... 35
. PRESSURE ........................................................90 .
Wiring Diagram --A/C-- ........................................ 36 . Insufficient Heating ................................................93 .
Auto Amp. Terminals and Reference Value ........... 45 . INSPECTION FLOW ...........................................94 .
PIN CONNECTOR TERMINAL LAYOUT ........... 46 . Noise ......................................................................95
.
AUTO AMP. INSPECTION TABLE ..................... 46 . INSPECTION FLOW ...........................................95 .
Self-diagnosis Function ......................................... 48
. Self-diagnosis ........................................................96.
DESCRIPTION ................................................... 48
. INSPECTION FLOW ...........................................96 .
PROCEDURE ..................................................... 49
. Memory Function ...................................................97 .
AUXILIARY MECHANISM: TEMPERATURE INSPECTION FLOW ...........................................97 .
SETTING TRIMMER .......................................... 56 . ECON (ECONOMY) Mode .....................................98 .
Operational Check ................................................. 57
. INSPECTION FLOW ...........................................98 .
CHECKING MEMORY FUNCTION .................... 57 . No A/C display is shown ........................................99 .
CHECKING BLOWER ........................................ 57 . A/C operation is not possible. .............................. 100 .
CHECKING DISCHARGE AIR ........................... 57 . Ambient Sensor Circuit ........................................ 102 .
CHECKING RECIRCULATION ........................... 58 . COMPONENT DESCRIPTION ......................... 102 .
CHECKING TEMPERATURE DECREASE ........ 58 . AMBIENT TEMPERATURE INPUT PROCESS .102
CHECKING TEMPERATURE INCREASE ......... 59 . DIAGNOSTIC PROCEDURE ............................ 102 .
CHECK ECON (ECONOMY) MODE .................. 59 . COMPONENT INSPECTION ............................ 104 .
CHECKING AUTO MODE .................................. 59 . In-Vehicle Sensor Circuit ...................................... 104 .
Power Supply and Ground Circuit for Auto Amp. ... 59 COMPONENT DESCRIPTION ......................... 104 .
INSPECTION FLOW .......................................... 60 . DIAGNOSTIC PROCEDURE ............................ 105 .
COMPONENT DESCRIPTION ........................... 60 . COMPONENT INSPECTION ............................ 106 .
DIAGNOSTIC PROCEDURE ............................. 61 . Sunload Sensor Circuit ........................................ 107 .
LAN System Circuit ............................................... 62
. COMPONENT DESCRIPTION ......................... 107 .
DIAGNOSTIC PROCEDURE ............................. 62 . SUNLOAD INPUT PROCESS .......................... 107 .
Mode Door Motor Circuit ....................................... 66 . DIAGNOSTIC PROCEDURE ............................ 107 .
INSPECTION FLOW .......................................... 66 . COMPONENT INSPECTION ............................ 109 .
SYSTEM DESCRIPTION ................................... 67 . Intake Sensor Circuit ............................................ 110 .
COMPONENT DESCRIPTION ........................... 68 . COMPONENT DESCRIPTION ......................... 110 .
DIAGNOSTIC PROCEDURE ............................. 68 . DIAGNOSTIC PROCEDURE ............................ 110 .
Air Mix Door Motor Circuit ..................................... 69. Multiplex Communication Circuit .......................... 111 .
INSPECTION FLOW .......................................... 69 . DIAGNOSTIC PROCEDURE ............................ 111 .
SYSTEM DESCRIPTION ................................... 70 . CONTROL UNIT ..................................................... 114 .
COMPONENT DESCRIPTION ........................... 71 . Removal and Installation ...................................... 114 .
DIAGNOSTIC PROCEDURE ............................. 71 . AMBIENT SENSOR ............................................... 115 .
Intake Door Motor Circuit ....................................... 72
. Removal and Installation ...................................... 115 .
INSPECTION FLOW .......................................... 72 . IN-VEHICLE SENSOR ........................................... 116 .
SYSTEM DESCRIPTION ................................... 73 . Removal and Installation ...................................... 116 .
COMPONENT DESCRIPTION ........................... 74 . SUNLOAD SENSOR .............................................. 117 .
DIAGNOSTIC PROCEDURE ............................. 74 . Removal and Installation ...................................... 117 .
Rear Ventilator Door Motor .................................... 74 . INTAKE SENSOR CIRCUIT ................................... 118 .
COMPONENT DESCRIPTION ........................... 74 . Removal and Installation ...................................... 118 .
DIAGNOSTIC PROCEDURE ............................. 74 . BLOWER UNIT ....................................................... 119 .
Blower Motor Circuit .............................................. 75
. Removal and Installation ...................................... 119 .
INSPECTION FLOW .......................................... 76 . REMOVAL ......................................................... 119 .
SYSTEM DESCRIPTION ................................... 77 .
Revision: 2004 April ATC-2 2002 Q45
INSTALLATION .................................................119 . INSTALLATION ................................................ 138 .
Disassembly and Assembly ................................ 120 . Removal and Installation for Low-Pressure Flexible A
BLOWER MOTOR ................................................. 121 . Hose .................................................................... 139
.
Removal and Installation ..................................... 121 . REMOVAL ........................................................ 139 .
INTAKE DOOR MOTOR ........................................ 122 . INSTALLATION ................................................ 139 . B
Removal and Installation ..................................... 122 . Removal and Installation of High-Pressure Flexible
VENTILATION AIR FILTER ................................... 123 . Hose .................................................................... 140
.
Removal and Installation ..................................... 123 . REMOVAL ........................................................ 140 .
FUNCTION ....................................................... 123
. INSTALLATION ................................................ 140 . C
REPLACEMENT TIMING ................................. 123 . Removal and Installation for High-Pressure Pipe . 140
REPLACEMENT PROCEDURES .................... 123 . REMOVAL ........................................................ 140 .
HEATER & COOLING UNIT ASSEMBLY ............. 124 . INSTALLATION ................................................ 141 . D
Removal and Installation ..................................... 124 . Removal and Installation for Refrigerant pressure
REMOVAL ........................................................ 124
. sensor .................................................................. 141
.
INSTALLATION ................................................ 125 . Removal and Installation for Refrigerant Pressure E
Disassembly and Assembly ................................ 126 . Sensor (To be applied after the middle of June 2001.)
MODE DOOR MOTOR .......................................... 127 . . 141
Removal and Installation ..................................... 127 . Removal and Installation for Condenser ............. 142 .
DRIVER SIDE MODE DOOR MOTOR ............ 127 . REMOVAL ........................................................ 142 . F
PASSENGER SIDE MODE DOOR MOTOR .... 127 . INSTALLATION ................................................ 143 .
AIR MIX DOOR MOTOR ........................................ 128 . Removing and Installation for Liquid Tank (To be
Removal and Installation ..................................... 128 . applied after the middle of June 2001.) ............... 143 . G
DRIVER SIDE AIR MIX DOOR MOTOR .......... 128 . REMOVAL ........................................................ 143 .
PASSENGER SIDE AIR MIX DOOR MOTOR . 128 INSTALLATION ................................................ 144 .
DUCTS AND GRILLES ......................................... 129 . Removal and Installation for Evaporator ............. 144 . H
Removal and Installation ..................................... 129 . REMOVAL ........................................................ 144 .
VENTILATOR DUCT, DEFROSTER NOZZLE INSTALLATION ................................................ 144 .
AND DEFROSTER DUCTS ............................. 129 . Removal and Installation of Expansion Valve ...... 144 .
I
CENTER VENTILATOR GRILLE ..................... 129 . Removal and Installation for Desiccant Assembly. 145
SIDE VENTILATOR GRILLE ............................ 129 . REMOVAL ........................................................ 145 .
REAR VENTILATOR GRILLE .......................... 130 . INSTALLATION ................................................ 145 .
REAR VENTILATOR SIDE GRILLE ................. 130 . Checking for Refrigerant Leaks ........................... 145 . ATC
REAR VENTILATOR DUCTS ........................... 130 . Checking System for Leaks Using the Fluorescent
REAR VENTILATOR SIDE DUCTS ................. 131 . Leak Detector ...................................................... 146.
FOOT DUCT .................................................... 131 . Dye Injection ........................................................ 146
. K
FLOOR DUCT .................................................. 131 . Electronic Refrigerant Leak Detector ................... 146 .
REFRIGERANT LINES .......................................... 132 . PRECAUTIONS FOR HANDLING LEAK
HFC-134a (R-134a) Service Procedure .............. 132 . DETECTOR ...................................................... 146 . L
SETTING OF SERVICE TOOLS AND EQUIP- CHECKING PROCEDURE .............................. 147 .
MENT ............................................................... 132
. SERVICE DATA AND SPECIFICATIONS (SDS) ... 149 .
Components ........................................................ 134
. COMPRESSOR ................................................... 149 .
Removal and Installation for Compressor ........... 135 . LUBRICANT ........................................................ 149 . M
REMOVAL ........................................................ 135
. REFRIGERANT ................................................... 149 .
INSTALLATION ................................................ 135 . ENGINE IDLING SPEED ..................................... 149 .
Removal and Installation for Compressor Clutch . 136 BELT TENSION ................................................... 149 .
REMOVAL ........................................................ 136
.
Revision: 2004 April ATC-3 2002 Q45
PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS000SU
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. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:
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.
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.
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.
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
are mixed and compressor failure is likely to occur, refer to "CONTAMINATED REFRIGERANT"
below. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refriger-
ant 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 failure 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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