Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2003_Q45 atc
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AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
A
B
SECTION
AUTOMATIC AIR CONDITIONER C
D
E
CONTENTS
PRECAUTIONS ......................................................... 4
. DESCRIPTION ................................................... 19
. F
Precautions for Supplemental Restraint System Component Layout ................................................ 22
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- LUBRICANT ............................................................. 23
.
SIONER" ................................................................. 4
. Maintenance of Lubricant Quantity in Compressor 23 ... G
Precautions for Working with HFC-134a (R-134a) 4 ..... LUBRICANT ....................................................... 23
.
CONTAMINATED REFRIGERANT ...................... 5 . LUBRICANT RETURN OPERATION ................. 23 .
General Refrigerant Precautions ............................. 5 . LUBRICANT ADJUSTING PROCEDURE FOR
H
Lubricant Precautions ............................................. 5
. COMPONENTS REPLACEMENT EXCEPT
Precautions for Refrigerant Connection .................. 6 . COMPRESSOR ................................................. 24 .
FEATURES OF NEW TYPE REFRIGERANT LUBRICANT ADJUSTING PROCEDURE FOR
CONNECTION ..................................................... 6. COMPRESSOR REPLACEMENT ...................... 24 . I
O-RING AND REFRIGERANT CONNECTION..... 7 AIR CONDITIONER CONTROL .............................. 26 .
Precautions for Servicing Compressor .................... 9 . Description of Air Conditioner LAN Control System 26 ...
Precautions for Service Equipment ......................... 9 . System Construction ............................................. 26
. ATC
RECOVERY/RECYCLING EQUIPMENT ............. 9 . OPERATION ....................................................... 27
.
ELECTRONIC LEAK DETECTOR ....................... 9 . TRANSMISSION DATA AND TRANSMISSION
VACUUM PUMP ................................................ 10 . ORDER .............................................................. 27
.
K
MANIFOLD GAUGE SET ................................... 10 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
SERVICE HOSES .............................................. 10 . PERATURE CONTROL) .................................... 28 .
SERVICE COUPLERS ........................................11 . FAN SPEED CONTROL ..................................... 28 .
REFRIGERANT WEIGHT SCALE ......................11 . INTAKE DOOR CONTROL ................................ 28 . L
CALIBRATING ACR4 WEIGHT SCALE ..............11 . OUTLET DOOR CONTROL ............................... 28 .
CHARGING CYLINDER ......................................11 . MAGNET CLUTCH CONTROL .......................... 29 .
Precautions for Leak Detection Dye ...................... 12 . SELF-DIAGNOSTIC SYSTEM ........................... 29 . M
IDENTIFICATION ............................................... 12 . Description of Control System ............................... 30 .
IDENTIFICATION LABEL FOR VEHICLE .......... 12 . Control Operation .................................................. 31
.
Wiring Diagrams and Trouble Diagnosis ............... 12 . DISPLAY SCREEN ............................................. 31 .
PREPARATION ........................................................ 13
. AUTO SWITCH (DRIVER SIDE) ........................ 31 .
Special Service Tools ............................................ 13
. AUTO SWITCH (PASSENGER SIDE) ............... 31 .
HFC-134a (R-134a) Service Tools and Equipment 13 ... TEMPERATURE DIAL (POTENTIO TEMPERA-
Commercial Service Tools ..................................... 16 . TURE CONTROL) (DRIVER SIDE) .................... 31 .
REFRIGERATION SYSTEM .................................... 17 . TEMPERATURE DIAL (POTENTIO TEMPERA-
Refrigerant Cycle .................................................. 17
. TURE CONTROL) (PASSENGER SIDE) ........... 31 .
REFRIGERANT FLOW ...................................... 17 . INTAKE SWITCH ................................................ 32.
FREEZE PROTECTION .................................... 17 . DEFROSTER (DEF) SWITCH ............................ 32 .
Refrigerant System Protection .............................. 17 . OFF SWITCH ..................................................... 32
.
REFRIGERANT PRESSURE SENSOR ............ 17 . MODE SWITCH (DRIVER SIDE) ....................... 32 .
PRESSURE RELIEF VALVE .............................. 17 . MODE SWITCH (PASSENGER SIDE) ............... 32 .
V-6 Variable Displacement Compressor ................ 18 . ECON (ECONOMY) SWITCH ............................ 32 .
GENERAL INFORMATION ................................ 18 . FAN SWITCH ..................................................... 32
.
Revision; 2004 April ATC-1 2003 Q45
DUAL SWITCH ................................................... 32 . DIAGNOSTIC PROCEDURE FOR INTAKE
FAIL-SAFE FUNCTION ......................................... 32 . DOOR MOTOR ...................................................79 .
Discharge Air Flow ................................................ 33 . Rear Ventilator Door Motor ....................................79 .
System Description ................................................ 34 . COMPONENT DESCRIPTION ...........................79 .
SWITCHES AND THEIR CONTROL FUNCTION 34 ... DIAGNOSTIC PROCEDURE FOR REAR VEN-
TROUBLE DIAGNOSIS ........................................... 35 . TILATOR DOOR MOTOR ...................................79 .
How to Perform Trouble Diagnoses for Quick and Rear control switch ................................................80 .
Accurate Repair ..................................................... 35
. DIAGNOSTIC PROCEDURE FOR REAR CON-
WORK FLOW ..................................................... 35 . TROL SWITCH ...................................................80 .
SYMPTOM TABLE ............................................. 35 . Blower Motor Circuit ...............................................81 .
Component Parts and Harness Connector Location 36 ... INSPECTION FLOW ...........................................81 .
ENGINE COMPARTMENT ................................. 36 . SYSTEM DESCRIPTION ....................................82 .
PASSENGER COMPARTMENT ......................... 37 . COMPONENT DESCRIPTION ...........................83 .
Schematic .............................................................. 38
. DIAGNOSTIC PROCEDURE FOR BLOWER
Wiring Diagram --A/C-- ........................................ 39 . 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 ..............................91 .
AUXILIARY MECHANISM: TEMPERATURE Insufficient Cooling .................................................92 .
SETTING TRIMMER .......................................... 61 . INSPECTION FLOW ...........................................92 .
Operational Check ................................................. 62 . PERFORMANCE TEST DIAGNOSES ...............93 .
CHECKING MEMORY FUNCTION .................... 62 . PERFORMANCE CHART ...................................95 .
CHECKING BLOWER ........................................ 62 . TROUBLE DIAGNOSES FOR UNUSUAL PRES-
CHECKING DISCHARGE AIR ........................... 62 . SURE ..................................................................96
.
CHECKING RECIRCULATION ........................... 63 . DIAGNOSTIC PROCEDURE FOR INSUFFI-
CHECKING TEMPERATURE DECREASE ........ 63 . CIENT COOLING ................................................98 .
CHECKING TEMPERATURE INCREASE ......... 64 . Insufficient Heating .............................................. 100 .
CHECK ECON (ECONOMY) MODE .................. 64 . INSPECTION FLOW ......................................... 100 .
CHECKING AUTO MODE .................................. 64 . Noise .................................................................... 101
.
Power Supply and Ground Circuit for Auto Amp. ... 65 INSPECTION FLOW ......................................... 101 .
INSPECTION FLOW .......................................... 65 . Self-diagnosis ...................................................... 102.
COMPONENT DESCRIPTION ........................... 65 . INSPECTION FLOW ......................................... 102 .
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 66 ... Memory Function ................................................. 103 .
LAN System Circuit ............................................... 67 . INSPECTION FLOW ......................................... 103 .
DIAGNOSTIC PROCEDURE FOR LAN CIR- ECON (ECONOMY) Mode ................................... 104 .
CUIT ................................................................... 67
. INSPECTION FLOW ......................................... 104 .
Mode Door Motor Circuit ....................................... 71 . No A/C Display is Shown ..................................... 105 .
INSPECTION FLOW .......................................... 71 . A/C Operation is not Possible. ............................. 106 .
SYSTEM DESCRIPTION ................................... 72 . Ambient Sensor Circuit ........................................ 108 .
COMPONENT DESCRIPTION ........................... 73 . COMPONENT DESCRIPTION ......................... 108 .
DIAGNOSTIC PROCEDURE FOR MODE AMBIENT TEMPERATURE INPUT PROCESS .108
DOOR MOTOR .................................................. 73 . DIAGNOSTIC PROCEDURE FOR AMBIENT
Air Mix Door Motor Circuit ..................................... 74 . SENSOR ........................................................... 108 .
INSPECTION FLOW .......................................... 74 . COMPONENT INSPECTION ............................ 110 .
SYSTEM DESCRIPTION ................................... 75 . In-Vehicle Sensor Circuit ...................................... 110 .
COMPONENT DESCRIPTION ........................... 76 . COMPONENT DESCRIPTION ......................... 110 .
DIAGNOSTIC PROCEDURE FOR AIR MIX DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
DOOR MOTOR .................................................. 76 . SENSOR ........................................................... 111 .
Air Mix Door Motor PBR Circuit ............................. 76 . COMPONENT INSPECTION ............................ 112 .
DIAGNOSTIC PROCEDURE FOR AIR MIX Sunload Sensor Circuit ........................................ 113 .
DOOR MOTOR PBR .......................................... 76 . COMPONENT DESCRIPTION ......................... 113 .
Intake Door Motor Circuit ....................................... 77 . SUNLOAD INPUT PROCESS .......................... 113 .
INSPECTION FLOW .......................................... 77 . DIAGNOSTIC PROCEDURE FOR SUNLOAD
SYSTEM DESCRIPTION ................................... 78 . SENSOR ........................................................... 113 .
COMPONENT DESCRIPTION ........................... 79 . COMPONENT INSPECTION ............................ 115 .
Revision; 2004 April ATC-2 2003 Q45
Intake Sensor Circuit ............................................116 . AIR MIX DOOR MOTOR ........................................ 137 .
COMPONENT DESCRIPTION .........................116 . Removal and Installation ..................................... 137 . A
DIAGNOSTIC PROCEDURE FOR INTAKE SEN- REMOVAL ........................................................ 137 .
SOR ..................................................................116
. INSTALLATION ................................................ 137 .
COMPONENT INSPECTION ............................117 . DUCTS AND GRILLES .......................................... 138 . B
Multiplex Communication Circuit ..........................118 . Removal and Installation ..................................... 138 .
DIAGNOSTIC PROCEDURE FOR MULTIPLEX REMOVAL ........................................................ 138 .
COMMUNICATION CIRCUIT (FRONT CON- INSTALLATION ................................................ 140 .
TROLLER) ........................................................118. REFRIGERANT LINES .......................................... 141 . C
DIAGNOSTIC PROCEDURE FOR MULTIPLEX HFC-134a (R-134a) Service Procedure .............. 141 .
COMMUNICATION CIRCUIT (REAR CONTROL SETTING OF SERVICE TOOLS AND EQUIP-
SWITCH) .......................................................... 121
. MENT ............................................................... 141
. D
CONTROL UNIT .................................................... 123 . Components ........................................................ 143.
Removal and Installation ..................................... 123 . Compressor ......................................................... 144
.
REMOVAL ........................................................ 123. REMOVAL ........................................................ 144 . E
INSTALLATION ................................................ 123 . INSTALLATION ................................................ 144 .
AMBIENT SENSOR ............................................... 124 . Compressor Clutch .............................................. 145 .
Removal and Installation ..................................... 124 . REMOVAL ........................................................ 145 .
REMOVAL ........................................................ 124. INSTALLATION ................................................ 147 . F
INSTALLATION ................................................ 124 . Low-Pressure Flexible Hose ................................ 148 .
IN-VEHICLE SENSOR ........................................... 125 . REMOVAL ........................................................ 148 .
Removal and Installation ..................................... 125 . INSTALLATION ................................................ 148 . G
REMOVAL ........................................................ 125. High-Pressure Flexible Hose ............................... 149 .
INSTALLATION ................................................ 125 . REMOVAL ........................................................ 149 .
SUNLOAD SENSOR ............................................. 126 . INSTALLATION ................................................ 149 . H
Removal and Installation ..................................... 126 . High-Pressure Pipe ............................................. 149 .
REMOVAL ........................................................ 126. REMOVAL ........................................................ 149 .
INSTALLATION ................................................ 126 . INSTALLATION ................................................ 150 .
I
INTAKE SENSOR .................................................. 127 . Refrigerant Pressure Sensor ............................... 150 .
Removal and Installation ..................................... 127 . REMOVAL ........................................................ 150 .
REMOVAL ........................................................ 127. INSTALLATION ................................................ 150 .
INSTALLATION ................................................ 127 . Condenser ........................................................... 151
. ATC
BLOWER UNIT ...................................................... 128 . REMOVAL ........................................................ 151 .
Removal and Installation ..................................... 128 . INSTALLATION ................................................ 152 .
REMOVAL ........................................................ 128. Liquid Tank .......................................................... 152
. K
INSTALLATION ................................................ 128 . REMOVAL ........................................................ 153 .
Disassembly and Assembly ................................ 129 . INSTALLATION ................................................ 153 .
BLOWER MOTOR ................................................. 130 . Evaporator ........................................................... 153
. L
Removal and Installation ..................................... 130 . REMOVAL ........................................................ 153 .
REMOVAL ........................................................ 130. INSTALLATION ................................................ 154 .
INSTALLATION ................................................ 130 . Expansion Valve .................................................. 154 .
INTAKE DOOR MOTOR ........................................ 131 . REMOVAL ........................................................ 154 . M
Removal and Installation ..................................... 131 . INSTALLATION ................................................ 154 .
REMOVAL ........................................................ 131. Checking for Refrigerant Leaks ........................... 155 .
INSTALLATION ................................................ 131 . Checking System for Leaks Using the Fluorescent
IN-CABIN MICROFILTER ...................................... 132 . Leak Detector ...................................................... 155
.
Removal and Installation ..................................... 132 . Dye Injection ........................................................ 155
.
FUNCTION ....................................................... 132. Electronic Refrigerant Leak Detector ................... 156 .
REPLACEMENT TIMING ................................. 132 . PRECAUTIONS FOR HANDLING LEAK
REPLACEMENT PROCEDURES .................... 132 . DETECTOR ...................................................... 156 .
HEATER & COOLING UNIT ASSEMBLY ............. 133 . CHECKING PROCEDURE .............................. 157 .
Removal and Installation ..................................... 133 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 159 .
REMOVAL ........................................................ 133. Compressor ......................................................... 159
.
INSTALLATION ................................................ 134 . Lubricant .............................................................. 159
.
Disassembly and Assembly ................................ 135 . Refrigerant ........................................................... 159
.
MODE DOOR MOTOR .......................................... 136 . Engine Idling Speed ............................................ 159 .
Removal and Installation ..................................... 136 . Belt Tension ......................................................... 159
.
REMOVAL ........................................................ 136.
INSTALLATION ................................................ 136 .
Revision; 2004 April ATC-3 2003 Q45
PRECAUTIONS
PRECAUTIONS PFP:00001
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
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
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:
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 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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