Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti QX56 JA60 2004-2005 Approved 2004_QX56 atc
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J AIR CONDITIONER
A
SECTION
AUTOMATIC AIR CONDITIONER
ATC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 5
. LUBRICANT ............................................................. 22
. F
Precautions for Supplemental Restraint System Maintenance of Lubricant Quantity in Compressor 22 ...
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- LUBRICANT ....................................................... 22.
SIONER" ................................................................. 5
. CHECKING AND ADJUSTING ........................... 22 . G
Precautions for Working with HFC-134a (R-134a) 5 ..... AIR CONDITIONER CONTROL .............................. 24 .
Contaminated Refrigerant ....................................... 5 . Description ............................................................. 24
.
General Refrigerant Precautions ............................. 6 . Operation ............................................................... 24
.
H
Precautions for Leak Detection Dye ........................ 6 . AIR MIX DOORS CONTROL ............................. 24 .
A/C Identification Label ........................................... 7
. FAN SPEED CONTROL ..................................... 24 .
Precautions for Refrigerant Connection .................. 7 . INTAKE DOOR CONTROL ................................ 24 .
FEATURES OF NEW TYPE REFRIGERANT MODE DOOR CONTROL .................................. 24 . I
CONNECTION ..................................................... 7. DEFROSTER DOOR CONTROL ....................... 24 .
O-RING AND REFRIGERANT CONNECTION ..... 8 MAGNET CLUTCH CONTROL .......................... 25 .
Precautions for Servicing Compressor ...................11 . SELF-DIAGNOSTIC SYSTEM ........................... 25 . ATC
Precautions for Service Equipment ........................11 . Description of Control System ............................... 26 .
RECOVERY/RECYCLING EQUIPMENT ............11 . Control Operation .................................................. 26
.
ELECTRONIC LEAK DETECTOR ......................11 . DISPLAY SCREEN ............................................. 27 .
K
VACUUM PUMP ................................................ 12 . AUTO SWITCH .................................................. 27 .
MANIFOLD GAUGE SET ................................... 12 . TEMPERATURE DIAL (DRIVER) ....................... 27 .
SERVICE HOSES .............................................. 12 . TEMPERATURE DIAL (PASSENGER) .............. 27 .
SERVICE COUPLERS ....................................... 13 . RECIRCULATION SWITCH () ............................ 27 . L
REFRIGERANT WEIGHT SCALE ..................... 13 . DEFROSTER () SWITCH ................................... 27 .
CHARGING CYLINDER ..................................... 13 . REAR WINDOW DEFOGGER SWITCH ............ 27 .
Wiring Diagrams and Trouble Diagnosis ............... 13 . OFF SWITCH (HOLD FAN DOWN SWITCH M
PREPARATION ........................................................ 14
. UNTIL SYSTEM SHUTS OFF) ........................... 27 .
Special Service Tools ............................................ 14
. A/C SWITCH ...................................................... 27.
HFC-134a (R-134a) Service Tools and Equipment 14 ... MODE SWITCH ................................................. 27 .
Commercial Service Tools ..................................... 17 . FRONT FAN SWITCH ........................................ 27 .
REFRIGERATION SYSTEM .................................... 18 . REAR FAN SWITCH (FRONT) ........................... 27 .
Refrigerant Cycle .................................................. 18
. REAR TEMPERATURE/MODE DIAL (FRONT)... 27
REFRIGERANT FLOW ...................................... 18 . REAR TEMPERATURE/MODE DIAL (REAR) ... 28
Refrigerant System Protection .............................. 18 . REAR FAN CONTROL SWITCH (REAR) .......... 28 .
REFRIGERANT PRESSURE SENSOR ............ 18 . Discharge Air Flow ................................................ 29.
PRESSURE RELIEF VALVE ............................. 19 . FRONT ............................................................... 29
.
Component Layout ................................................ 20. REAR ................................................................. 29
.
FRONT REFRIGERATION SYSTEM ................. 20 . System Description (Front) .................................... 30 .
REAR REFRIGERATION SYSTEM ................... 21 . CONTROLS AND THEIR FUNCTIONS ............. 30 .
System Description (Rear) .................................... 31 .
CONTROLS AND THEIR FUNCTIONS ............. 31 .
CAN Communication System Description ............. 32 .
Revision: August 2007 ATC-1 2004 QX56
TROUBLE DIAGNOSIS ........................................... 33 . DOOR MOTOR ...................................................78 .
CONSULT-II Function (BCM) ................................. 33 . Defroster Door Motor Circuit ..................................79 .
CONSULT-II BASIC OPERATION ...................... 33 . SYMPTOM: .........................................................79 .
DATA MONITOR ................................................. 34 . INSPECTION FLOW ...........................................79 .
How to Perform Trouble Diagnosis for Quick and SYSTEM DESCRIPTION ....................................80 .
Accurate Repair ..................................................... 35 . COMPONENT DESCRIPTION ...........................80 .
WORK FLOW ..................................................... 35 . DIAGNOSTIC PROCEDURE FOR
SYMPTOM TABLE ............................................. 35 . DEFROSTER DOOR MOTOR ............................81 .
Component Parts and Harness Connector Location 37 ... Front Blower Motor Circuit .....................................83 .
ENGINE COMPARTMENT ................................. 37 . INSPECTION FLOW ...........................................83 .
FRONT PASSENGER COMPARTMENT ........... 38 . SYSTEM DESCRIPTION ....................................84 .
REAR PASSENGER COMPARTMENT .............. 39 . COMPONENT DESCRIPTION ...........................85 .
Schematic .............................................................. 40 . DIAGNOSTIC PROCEDURE FOR BLOWER
Wiring Diagram -- A/C,A -- .................................. 41 . MOTOR ...............................................................85.
Front Air Control Terminals and Reference Value... 51 COMPONENT INSPECTION ..............................89 .
PIN CONNECTOR TERMINAL LAYOUT ........... 51 . Rear Blower Motor Circuit ......................................90 .
TERMINALS AND REFERENCE VALUE FOR INSPECTION FLOW ...........................................90 .
FRONT AIR CONTROL ...................................... 51 . SYSTEM DESCRIPTION ....................................91 .
A/C System Self-diagnosis Function ..................... 53 . DIAGNOSTIC PROCEDURE FOR REAR
DESCRIPTION ................................................... 53 . BLOWER MOTOR ..............................................91 .
Operational Check (Front) ..................................... 56 . COMPONENT INSPECTION ..............................99 .
CHECKING MEMORY FUNCTION .................... 56 . Rear Air Control Circuit ........................................ 101 .
CHECKING BLOWER ........................................ 56 . INSPECTION FLOW ......................................... 101 .
CHECKING DISCHARGE AIR ........................... 57 . SYSTEM DESCRIPTION .................................. 102 .
CHECKING RECIRCULATION ........................... 57 . DIAGNOSTIC PROCEDURE FOR REAR AIR
CHECKING TEMPERATURE DECREASE ........ 57 . CONTROL ........................................................ 102 .
CHECKING TEMPERATURE INCREASE ......... 58 . Magnet Clutch Circuit ........................................... 104 .
CHECK A/C SWITCH ......................................... 58 . INSPECTION FLOW ......................................... 104 .
CHECKING AUTO MODE .................................. 58 . SYSTEM DESCRIPTION .................................. 105 .
Operational Check (Rear) ...................................... 59 . DIAGNOSTIC PROCEDURE FOR MAGNET
CHECKING BLOWER ........................................ 59 . CLUTCH ........................................................... 105 .
CHECKING TEMPERATURE DECREASE ........ 59 . Insufficient Cooling ............................................... 110 .
CHECKING TEMPERATURE INCREASE ......... 59 . INSPECTION FLOW ......................................... 110 .
Power Supply and Ground Circuit for Front Air Con- PERFORMANCE TEST DIAGNOSES ............. 111 .
trol .......................................................................... 60
. PERFORMANCE CHART ................................. 113 .
INSPECTION FLOW .......................................... 60 . TROUBLE DIAGNOSES FOR UNUSUAL PRES-
COMPONENT DESCRIPTION ........................... 61 . SURE ................................................................ 114
.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 61 ... Insufficient Heating .............................................. 117 .
Mode Door Motor Circuit ....................................... 63 . INSPECTION FLOW ......................................... 117 .
INSPECTION FLOW .......................................... 63 . Noise .................................................................... 118
.
SYSTEM DESCRIPTION ................................... 64 . INSPECTION FLOW ......................................... 118 .
COMPONENT DESCRIPTION ........................... 65 . Self-diagnosis ...................................................... 120.
DIAGNOSTIC PROCEDURE FOR MODE INSPECTION FLOW ......................................... 120 .
DOOR MOTOR .................................................. 65 . Memory Function ................................................. 121 .
Air Mix Door Motor Circuit ..................................... 67 . INSPECTION FLOW ......................................... 121 .
INSPECTION FLOW .......................................... 67 . Water Valve Circuit ............................................... 121 .
SYSTEM DESCRIPTION ................................... 68 . COMPONENT DESCRIPTION ......................... 121 .
COMPONENT DESCRIPTION ........................... 69 . DIAGNOSTIC PROCEDURE FOR WATER
DIAGNOSTIC PROCEDURE FOR AIR MIX VALVE ............................................................... 122
.
DOOR MOTOR (DRIVER) .................................. 69 . COMPONENT INSPECTION ............................ 124 .
DIAGNOSTIC PROCEDURE FOR AIR MIX Ambient Sensor Circuit ........................................ 125 .
DOOR MOTOR (PASSENGER) ......................... 71 . COMPONENT DESCRIPTION ......................... 125 .
DIAGNOSTIC PROCEDURE FOR AIR MIX AMBIENT TEMPERATURE INPUT PROCESS .125
DOOR MOTOR (REAR) ..................................... 73 . DIAGNOSTIC PROCEDURE FOR AMBIENT
Intake Door Motor Circuit ....................................... 76 . SENSOR ........................................................... 125 .
INSPECTION FLOW .......................................... 76 . COMPONENT INSPECTION ............................ 127 .
SYSTEM DESCRIPTION ................................... 77 . In-vehicle Sensor Circuit ...................................... 128 .
COMPONENT DESCRIPTION ........................... 78 . COMPONENT DESCRIPTION ......................... 128 .
DIAGNOSTIC PROCEDURE FOR INTAKE DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
Revision: August 2007 ATC-2 2004 QX56
SENSOR .......................................................... 129 . INTAKE DOOR MOTOR ........................................ 151 .
COMPONENT INSPECTION ........................... 131 . Removal and Installation ..................................... 151 . A
Optical Sensor Circuit ......................................... 131 . REMOVAL ........................................................ 151 .
COMPONENT DESCRIPTION ........................ 131 . INSTALLATION ................................................ 151 .
OPTICAL INPUT PROCESS ........................... 131 . MODE DOOR MOTOR ........................................... 152 . B
DIAGNOSTIC PROCEDURE FOR OPTICAL Removal and Installation ..................................... 152 .
SENSOR .......................................................... 132 . REMOVAL ........................................................ 152 .
Intake Sensor Circuit ........................................... 133 . INSTALLATION ................................................ 152 .
COMPONENT DESCRIPTION ........................ 133 . AIR MIX DOOR MOTOR ........................................ 153 . C
DIAGNOSTIC PROCEDURE FOR INTAKE SEN- Components ........................................................ 153 .
SOR ................................................................. 133
. Removal and Installation ..................................... 153 .
COMPONENT INSPECTION ........................... 134 . FRONT AIR MIX DOOR MOTOR (DRIVER) .... 153 . D
CONTROL UNIT .................................................... 135 . FRONT AIR MIX DOOR MOTOR (PASSENGER) 154 .
Removal and Installation ..................................... 135 . REAR AIR MIX DOOR MOTOR ....................... 154 .
FRONT AIR CONTROL ................................... 135 . VARIABLE BLOWER CONTROL .......................... 155 . E
REAR AIR CONTROL ...................................... 135 . Removal and Installation ..................................... 155 .
AMBIENT SENSOR ............................................... 136 . REMOVAL ........................................................ 155 .
Removal and Installation ..................................... 136 . INSTALLATION ................................................ 155 .
REMOVAL ........................................................ 136 . REAR BLOWER MOTOR RESISTOR ................... 156 . F
INSTALLATION ................................................ 136 . Removal and Installation ..................................... 156 .
IN-VEHICLE SENSOR ........................................... 137 . REMOVAL ........................................................ 156 .
Removal and Installation ..................................... 137 . INSTALLATION ................................................ 156 . G
REMOVAL ........................................................ 137 . DUCTS AND GRILLES .......................................... 157 .
INSTALLATION ................................................ 137 . Components ........................................................ 157 .
OPTICAL SENSOR ............................................... 138 . Removal and Installation ..................................... 160 . H
Removal and Installation ..................................... 138 . CENTER CONSOLE HEAT DUCT AND REAR
INTAKE SENSOR .................................................. 139 . FINISHER ASSEMBLY GRILLE ....................... 160 .
Removal and Installation ..................................... 139 . DEFROSTER NOZZLE .................................... 160 .
I
REMOVAL ........................................................ 139 . RH AND LH SIDE DEMISTER DUCT .............. 160 .
INSTALLATION ................................................ 139 . RH AND LH VENTILATOR DUCT .................... 160 .
BLOWER MOTOR ................................................. 140 . CENTER VENTILATOR DUCT ........................ 160 .
Components ........................................................ 140 . FLOOR DUCT .................................................. 160 . ATC
Removal and Installation ..................................... 140 . REAR OVERHEAD DUCTS ............................. 160 .
FRONT BLOWER MOTOR .............................. 140 . REAR FLOOR DUCT ....................................... 161 .
REAR BLOWER MOTOR ................................ 141 . GRILLES .......................................................... 161 . K
IN-CABIN MICROFILTER ...................................... 142 . REFRIGERANT LINES .......................................... 162 .
Removal and Installation ..................................... 142 . HFC-134a (R-134a) Service Procedure .............. 162 .
FUNCTION ....................................................... 142 . SETTING OF SERVICE TOOLS AND EQUIP-
L
REPLACEMENT TIMING ................................. 142 . MENT ............................................................... 162
.
REPLACEMENT PROCEDURE ...................... 142 . Components ........................................................ 164 .
HEATER & COOLING UNIT ASSEMBLY ............. 144 . Removal and Installation for Compressor ........... 166 .
Components ........................................................ 144 . REMOVAL ........................................................ 166 . M
Removal and Installation ..................................... 145 . INSTALLATION ................................................ 167 .
FRONT HEATER AND COOLING UNIT ASSEM- Removal and Installation for Compressor Clutch . 167
BLY ................................................................... 145
. REMOVAL ........................................................ 167 .
REAR HEATER AND COOLING UNIT ASSEM- INSPECTION ................................................... 168 .
BLY ................................................................... 146
. INSTALLATION ................................................ 168 .
HEATER CORE ..................................................... 147 . BREAK-IN OPERATION ................................... 170 .
Components ........................................................ 147 . Removal and Installation for Low-pressure Flexible
Removal and Installation ..................................... 148 . Hose .................................................................... 170
.
FRONT HEATER CORE .................................. 148 . REMOVAL ........................................................ 170 .
REAR HEATER CORE .................................... 149 . INSTALLATION ................................................ 170 .
DEFROSTER DOOR MOTOR ............................... 150 . Removal and Installation for High-pressure Flexible
Removal and Installation ..................................... 150 . Hose .................................................................... 170
.
REMOVAL ........................................................ 150 . REMOVAL ........................................................ 170 .
INSTALLATION ................................................ 150 . INSTALLATION ................................................ 170 .
Removal and Installation for High-pressure Pipe . 170
REMOVAL ........................................................ 170 .
INSTALLATION ................................................ 171 .
Revision: August 2007 ATC-3 2004 QX56
Removal and Installation for Low-pressure Pipe . 171 INSTALLATION ................................................. 177 .
REMOVAL ........................................................ 171 . Removal and Installation for Front Expansion Valve.177
INSTALLATION ................................................. 171 . REMOVAL ......................................................... 177
.
Removal and Installation for Rear High- and Low- INSTALLATION ................................................. 177 .
pressure A/C and Heater Core Pipes .................. 171 . Removal and Installation for Rear Expansion Valve.177
REMOVAL ........................................................ 171 . REMOVAL ......................................................... 177
.
INSTALLATION ................................................. 172 . INSTALLATION ................................................. 178 .
Removal and Installation for Underfloor Rear High- Checking for Refrigerant Leaks ........................... 178 .
and Low-pressure A/C and Heater Core Pipes ... 172 . Checking System for Leaks Using the Fluorescent
REMOVAL ........................................................ 172 . Dye Leak Detector ............................................... 178.
INSTALLATION ................................................. 173 . Dye Injection ........................................................ 178
.
Removal and Installation for Refrigerant Pressure Electronic Refrigerant Leak Detector ................... 179 .
Sensor ................................................................. 173
. PRECAUTIONS FOR HANDLING LEAK
REMOVAL ........................................................ 173 . DETECTOR ...................................................... 179.
INSTALLATION ................................................. 173 . CHECKING PROCEDURE ............................... 180 .
Removal and Installation for Condenser .............. 173 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 182 .
REMOVAL ........................................................ 173 . Service Data and Specifications (SDS) ............... 182 .
INSTALLATION ................................................. 174 . COMPRESSOR ................................................ 182 .
Removal and Installation for Front Evaporator .... 175 . LUBRICANT ...................................................... 182
.
REMOVAL ........................................................ 175 . REFRIGERANT ................................................ 182 .
INSTALLATION ................................................. 176 . ENGINE IDLING SPEED .................................. 182 .
Removal and Installation for Rear Evaporator ..... 176 . BELT TENSION ................................................ 182 .
REMOVAL ........................................................ 177 .
Revision: August 2007 ATC-4 2004 QX56
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS002BF
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
G 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
G 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
G 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) EJS002BG
WARNING:
G CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants H
are mixed compressor failure is likely to occur. Refer ATC-5, "Contaminated Refrigerant" . 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
G 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.
G 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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