Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti FX45 FX35 2003-2005 Approved FX45_35-S50-2005 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 ................ 22 . F
Precautions for Supplemental Restraint System GENERAL INFORMATION ................................ 22 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- DESCRIPTION ................................................... 23
.
SIONER" ................................................................. 5
. Component Layout ................................................ 26
. G
Precautions Necessary for Steering Wheel Rotation LUBRICANT ............................................................. 27
.
After Battery Disconnect ......................................... 5. Maintenance of Lubricant Quantity in Compressor 27 ...
OPERATION PROCEDURE ................................ 5 . LUBRICANT ....................................................... 27
.
H
Precautions for Procedures without Cowl Top Cover 6 ..... LUBRICANT RETURN OPERATION ................. 27 .
Precautions for Working with HFC-134a (R-134a) 6 ..... LUBRICANT ADJUSTING PROCEDURE FOR
CONTAMINATED REFRIGERANT ...................... 7 . COMPONENTS REPLACEMENT EXCEPT
General Refrigerant Precautions ............................. 7 . COMPRESSOR ................................................. 28 . I
Precautions for Refrigerant Connection .................. 8 . LUBRICANT ADJUSTING PROCEDURE FOR
ABOUT ONE-TOUCH JOINT ............................... 8 . COMPRESSOR REPLACEMENT ...................... 29 .
FEATURES OF NEW TYPE REFRIGERANT AIR CONDITIONER CONTROL .............................. 30 . ATC
CONNECTION ................................................... 10 . Description of Air Conditioner LAN Control System 30 ...
O-RING AND REFRIGERANT CONNECTION....11 System Construction ............................................. 30
.
Precautions for Servicing Compressor .................. 13 . OPERATION ....................................................... 30
.
K
Precautions for Service Equipment ....................... 13 . TRANSMISSION DATA AND TRANSMISSION
RECOVERY/RECYCLING EQUIPMENT ........... 13 . ORDER .............................................................. 31
.
ELECTRONIC LEAK DETECTOR ..................... 13 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
VACUUM PUMP ................................................ 14 . PERATURE CONTROL) .................................... 32 . L
MANIFOLD GAUGE SET ................................... 14 . FAN SPEED CONTROL ..................................... 32 .
SERVICE HOSES .............................................. 14 . INTAKE DOOR CONTROL ................................ 32 .
SERVICE COUPLERS ....................................... 15 . OUTLET DOOR CONTROL ............................... 32 . M
REFRIGERANT WEIGHT SCALE ..................... 15 . MAGNET CLUTCH CONTROL .......................... 33 .
CHARGING CYLINDER ..................................... 15 . SELF-DIAGNOSIS SYSTEM ............................. 33 .
Precautions for Leak Detection Dye ...................... 16 . Description of Control System ............................... 34 .
IDENTIFICATION ............................................... 16 . Control Operation .................................................. 34
.
IDENTIFICATION LABEL FOR VEHICLE .......... 16 . DISPLAY SCREEN ............................................. 34 .
PREPARATION ........................................................ 17
. AUTO SWITCH .................................................. 35.
Special Service Tools ............................................ 17
. TEMPERATURE SWITCH (POTENTIO TEM-
HFC-134a (R-134a) Service Tools and Equipment 18 ... PERATURE CONTROL) (DRIVER SIDE) .......... 35 .
Commercial Service Tools ..................................... 20 . TEMPERATURE SWITCH (POTENTIO TEM-
REFRIGERATION SYSTEM .................................... 21 . PERATURE CONTROL) (PASSENGER SIDE)... 35
Refrigerant Cycle .................................................. 21
. RECIRCULATION (REC) SWITCH .................... 35 .
REFRIGERANT FLOW ...................................... 21 . FRESH (FRE) SWITCH ..................................... 35 .
FREEZE PROTECTION .................................... 21 . DEFROSTER (DEF) SWITCH ............................ 35 .
Refrigerant System Protection .............................. 21 . REAR WINDOW DEFOGGER SWITCH ............ 35 .
REFRIGERANT PRESSURE SENSOR ............ 21 . OFF SWITCH ..................................................... 35
.
PRESSURE RELIEF VALVE .............................. 21 . A/C SWITCH ...................................................... 35
.
Revision: 2005 July ATC-1 2005 FX
MODE SWITCH .................................................. 35 . SYSTEM DESCRIPTION ....................................74 .
FAN SWITCH ..................................................... 35. COMPONENT DESCRIPTION ...........................75 .
DUAL SWITCH (WITH LEFT AND RIGHT VEN- DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
TILATION TEMPERATURE SEPARATELY MOTOR ...............................................................75.
CONTROL SYSTEM) ......................................... 35 . Air Mix Door Motor PBR Circuit .............................75 .
Fail-safe Function .................................................. 36
. DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
Discharge Air Flow ................................................ 37
. MOTOR PBR ......................................................75 .
System Description ................................................ 38
. Intake Door Motor Circuit .......................................76 .
SWITCHES AND THEIR CONTROL FUNCTION 38 ... INSPECTION FLOW ...........................................76 .
CAN Communication System Description ............. 39 . SYSTEM DESCRIPTION ....................................77 .
TROUBLE DIAGNOSIS ........................................... 40 . COMPONENT DESCRIPTION ...........................78 .
CONSULT-II Function (BCM) ................................. 40 . DIAGNOSIS PROCEDURE FOR INTAKE DOOR
CONSULT-II BASIC OPERATION ...................... 40 . MOTOR ...............................................................78.
DATA MONITOR ................................................. 41 . Blower Motor Circuit ...............................................79 .
How to Perform Trouble Diagnosis for Quick and INSPECTION FLOW ...........................................79 .
Accurate Repair ..................................................... 42
. SYSTEM DESCRIPTION ....................................80 .
WORK FLOW ..................................................... 42 . COMPONENT DESCRIPTION ...........................81 .
SYMPTOM TABLE ............................................. 42 . DIAGNOSIS PROCEDURE FOR BLOWER
Component Parts and Harness Connector Location 43 ... MOTOR ...............................................................81.
ENGINE COMPARTMENT ................................. 43 . COMPONENT INSPECTION ..............................83 .
PASSENGER COMPARTMENT ......................... 44 . Magnet Clutch Circuit .............................................84 .
Schematic .............................................................. 45
. INSPECTION FLOW ...........................................84 .
Wiring Diagram --A/C-- ........................................ 46 . SYSTEM DESCRIPTION ....................................85 .
Auto Amp. Terminals and Reference Value ........... 51 . DIAGNOSIS PROCEDURE FOR MAGNET
PIN CONNECTOR TERMINAL LAYOUT ........... 51 . CLUTCH .............................................................85 .
TERMINALS AND REFERENCE VALUE FOR COMPONENT INSPECTION ..............................90 .
UNIFIED METER AND A/C AMP. ....................... 51 . Insufficient Cooling .................................................91 .
Self-diagnosis Function ......................................... 53 . INSPECTION FLOW ...........................................91 .
DESCRIPTION ................................................... 53 . PERFORMANCE TEST DIAGNOSIS .................93 .
FUNCTION CONFIRMATION PROCEDURE ..... 54 . PERFORMANCE CHART ...................................95 .
AUXILIARY MECHANISM: TEMPERATURE TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SETTING TRIMMER .......................................... 59 . SURE ..................................................................96
.
AUXILIARY MECHANISM: FOOT POSITION DIAGNOSIS PROCEDURE FOR INSUFFI-
SETTING TRIMMER .......................................... 60 . CIENT COOLING ................................................98 .
AUXILIARY MECHANISM: INLET PORT MEM- Insufficient Heating .............................................. 100 .
ORY FUNCTION ................................................ 60 . INSPECTION FLOW ......................................... 100 .
Operational Check ................................................. 61
. Noise .................................................................... 101
.
CHECKING MEMORY FUNCTION .................... 61 . INSPECTION FLOW ......................................... 101 .
CHECKING BLOWER ........................................ 61 . Self-diagnosis ...................................................... 102.
CHECKING DISCHARGE AIR ........................... 61 . INSPECTION FLOW ......................................... 102 .
CHECKING INTAKE AIR .................................... 62 . Memory Function ................................................. 103 .
CHECKING TEMPERATURE DECREASE ........ 62 . INSPECTION FLOW ......................................... 103 .
CHECKING TEMPERATURE INCREASE ......... 62 . Ambient Sensor Circuit ........................................ 104 .
CHECK A/C SWITCH ......................................... 62 . COMPONENT DESCRIPTION ......................... 104 .
CHECKING AUTO MODE .................................. 63 . AMBIENT TEMPERATURE INPUT PROCESS .104
Power Supply and Ground Circuit for Auto Amp. ... 63 DIAGNOSIS PROCEDURE FOR AMBIENT
INSPECTION FLOW .......................................... 63 . SENSOR ........................................................... 104 .
COMPONENT DESCRIPTION ........................... 64 . COMPONENT INSPECTION ............................ 106 .
DIAGNOSIS PROCEDURE FOR A/C SYSTEM... 64 In-vehicle Sensor Circuit ...................................... 107 .
LAN System Circuit ............................................... 66. COMPONENT DESCRIPTION ......................... 107 .
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT 66 ... DIAGNOSIS PROCEDURE FOR IN-VEHICLE
Mode Door Motor Circuit ....................................... 70 . SENSOR ........................................................... 108 .
INSPECTION FLOW .......................................... 70 . COMPONENT INSPECTION ............................ 109 .
SYSTEM DESCRIPTION ................................... 71 . Sunload Sensor Circuit ........................................ 110 .
COMPONENT DESCRIPTION ........................... 72 . COMPONENT DESCRIPTION ......................... 110 .
DIAGNOSIS PROCEDURE FOR MODE DOOR SUNLOAD INPUT PROCESS .......................... 110 .
MOTOR .............................................................. 72
. DIAGNOSIS PROCEDURE FOR SUNLOAD
Air Mix Door Motor Circuit ..................................... 73 . SENSOR ........................................................... 110 .
INSPECTION FLOW .......................................... 73 .
Revision: 2005 July ATC-2 2005 FX
COMPONENT INSPECTION ............................112 . AIR MIX DOOR MOTOR ........................................ 132 .
Intake Sensor Circuit ............................................113 . Removal and Installation ..................................... 132 . A
COMPONENT DESCRIPTION .........................113 . REMOVAL ........................................................ 132 .
DIAGNOSIS PROCEDURE FOR INTAKE SEN- INSTALLATION ................................................ 132 .
SOR ..................................................................113
. HEATER CORE ...................................................... 133 . B
COMPONENT INSPECTION ............................114 . Removal and Installation ..................................... 133 .
CONTROLLER .......................................................115 . REMOVAL ........................................................ 133 .
Removal and Installation of A/C and AV Switch ...115 . INSTALLATION ................................................ 133 .
REMOVAL .........................................................115 . DUCTS AND GRILLES .......................................... 134 . C
INSTALLATION .................................................115 . Removal and Installation ..................................... 134 .
AUTO AMP .............................................................116 . REMOVAL ........................................................ 134 .
Removal and Installation of Unified Meter and A/C INSTALLATION ................................................ 137 . D
Amp. .....................................................................116
. REFRIGERANT LINES .......................................... 138 .
REMOVAL .........................................................116 . HFC-134a (R-134a) Service Procedure .............. 138 .
INSTALLATION .................................................116 . SETTING OF SERVICE TOOLS AND EQUIP- E
AMBIENT SENSOR ................................................117 . MENT ............................................................... 138
.
Removal and Installation ......................................117 . Components ........................................................ 140 .
REMOVAL .........................................................117 . VQ35DE ........................................................... 140.
INSTALLATION .................................................117 . VK45DE ............................................................ 141
. F
IN-VEHICLE SENSOR ............................................118 . Removal and Installation of Compressor ............. 141 .
Removal and Installation ......................................118 . REMOVAL ........................................................ 141 .
REMOVAL .........................................................118 . INSTALLATION ................................................ 143 . G
INSTALLATION .................................................118 . Removal and Installation of Compressor Clutch . 144
SUNLOAD SENSOR ..............................................119 . REMOVAL ........................................................ 144 .
Removal and Installation ......................................119 . INSTALLATION ................................................ 146 . H
REMOVAL .........................................................119 . Removal and Installation of Low-Pressure Flexible
INSTALLATION .................................................119 . Hose .................................................................... 148
.
INTAKE SENSOR .................................................. 120 . REMOVAL ........................................................ 148 .
I
Removal and Installation ..................................... 120 . INSTALLATION ................................................ 149 .
REMOVAL ........................................................ 120 . Removal and Installation of High-Pressure Flexible
INSTALLATION ................................................ 120 . Hose .................................................................... 149
.
BLOWER UNIT ...................................................... 121 . REMOVAL ........................................................ 149 . ATC
Removal and Installation ..................................... 121 . INSTALLATION ................................................ 150 .
REMOVAL ........................................................ 121 . Removal and Installation of Low-Pressure Pipe 1
INSTALLATION ................................................ 121 . (Engine Compartment) ........................................ 150 . K
Disassembly and Assembly ................................ 122 . REMOVAL ........................................................ 150 .
BLOWER MOTOR ................................................. 123 . INSTALLATION ................................................ 151 .
Removal and Installation ..................................... 123 . Removal and Installation of High-Pressure Pipe 1 L
REMOVAL ........................................................ 123 . and 2 (Engine Compartment) .............................. 151 .
INSTALLATION ................................................ 123 . REMOVAL ........................................................ 151 .
INTAKE DOOR MOTOR ........................................ 124 . INSTALLATION ................................................ 152 .
Removal and Installation ..................................... 124 . Removal and Installation of Low-Pressure Pipe 2 M
REMOVAL ........................................................ 124 . and High-Pressure Pipe 3 ................................... 152 .
INSTALLATION ................................................ 124 . REMOVAL ........................................................ 152 .
IN-CABIN MICROFILTER ...................................... 125 . INSTALLATION ................................................ 153 .
Removal and Installation ..................................... 125 . Removal and Installation of Liquid Tank .............. 154 .
FUNCTION ....................................................... 125 . REMOVAL ........................................................ 154 .
REPLACEMENT TIMING ................................. 125 . INSTALLATION ................................................ 154 .
REPLACEMENT PROCEDURES .................... 125 . Removal and Installation of Condenser ............... 155 .
HEATER & COOLING UNIT ASSEMBLY ............. 126 . REMOVAL ........................................................ 155 .
Removal and Installation ..................................... 126 . INSTALLATION ................................................ 155 .
REMOVAL ........................................................ 126 . Removal and Installation of Refrigerant Pressure
INSTALLATION ................................................ 127 . Sensor ................................................................. 156
.
Disassembly and Assembly ................................ 129 . REMOVAL ........................................................ 156 .
MODE DOOR MOTOR .......................................... 131 . INSTALLATION ................................................ 156 .
Removal and Installation ..................................... 131 . Removal and Installation of Evaporator ............... 156 .
REMOVAL ........................................................ 131 . REMOVAL ........................................................ 156 .
INSTALLATION ................................................ 131 . INSTALLATION ................................................ 156 .
Removal and Installation of Expansion Valve ...... 157 .
Revision: 2005 July ATC-3 2005 FX
REMOVAL ........................................................ 157
. DETECTOR ...................................................... 159 .
INSTALLATION ................................................. 157 . CHECKING PROCEDURE ............................... 160 .
Checking for Refrigerant Leaks ........................... 158 . 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: 2005 July ATC-4 2005 FX
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" AJS001XF
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 Necessary for Steering Wheel Rotation After Battery Disconnect
AJS001XG
NOTE: H
q This Procedure is applied only to models with Intelligent Key system and NVIS/IVIS (NISSAN/INFINITI
VEHICLE IMMOBILIZER SYSTEM - NATS).
q Remove and install all control units after disconnecting both battery cables with the ignition knob in the I
LOCK position.
q Always use CONSULT-II to perform self-diagnosis as a part of each function inspection after finishing
work. If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
ATC
For models equipped with the Intelligent Key system and NVIS/IVIS, an electrically controlled steering lock
mechanism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible. K
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE L
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged. M
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ACC position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
5. When the repair work is completed, return the ignition switch to the LOCK position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of all control units using CONSULT-II.
Revision: 2005 July ATC-5 2005 FX
PRECAUTIONS
Precautions for Procedures without Cowl Top Cover AJS001XH
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
PIIB3706J
Precautions for Working with HFC-134a (R-134a) AJS001XI
CAUTION:
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 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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