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AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
A
B
SECTION
AUTOMATIC AIR CONDITIONER C
D
E
CONTENTS
PRECAUTIONS ......................................................... 5
. DESCRIPTION ................................................... 21
. F
Precautions for Supplemental Restraint System Component Layout ................................................ 24
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- LUBRICANT ............................................................. 25
.
SIONER" ................................................................. 5
. Maintenance of Lubricant Quantity in Compressor 25 ... G
Precautions for Working with HFC-134a (R-134a) 5 ..... LUBRICANT ....................................................... 25
.
CONTAMINATED REFRIGERANT ...................... 6 . LUBRICANT RETURN OPERATION ................. 25 .
General Refrigerant Precautions ............................. 6 . LUBRICANT ADJUSTING PROCEDURE FOR
H
Lubricant Precautions ............................................. 6
. COMPONENTS REPLACEMENT EXCEPT
Precautions for Refrigerant Connection .................. 7 . COMPRESSOR ................................................. 26 .
ABOUT ONE-TOUCH JOINT ............................... 7 . LUBRICANT ADJUSTING PROCEDURE FOR
FEATURES OF NEW TYPE REFRIGERANT COMPRESSOR REPLACEMENT ...................... 26 . I
CONNECTION ..................................................... 9. AIR CONDITIONER CONTROL .............................. 28 .
O-RING AND REFRIGERANT CONNECTION... 10 Description of Air Conditioner LAN Control System 28 ...
Precautions for Servicing Compressor ...................11 . System Construction ............................................. 28
. ATC
Precautions for Service Equipment ....................... 12 . OPERATION ....................................................... 29
.
RECOVERY/RECYCLING EQUIPMENT ........... 12 . TRANSMISSION DATA AND TRANSMISSION
ELECTRONIC LEAK DETECTOR ..................... 12 . ORDER .............................................................. 29
.
K
VACUUM PUMP ................................................ 12 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
MANIFOLD GAUGE SET ................................... 12 . PERATURE CONTROL) .................................... 30 .
SERVICE HOSES .............................................. 13 . FAN SPEED CONTROL ..................................... 30 .
SERVICE COUPLERS ....................................... 13 . INTAKE DOOR CONTROL ................................ 30 . L
REFRIGERANT WEIGHT SCALE ..................... 13 . OUTLET DOOR CONTROL ............................... 30 .
CHARGING CYLINDER ..................................... 13 . MAGNET CLUTCH CONTROL .......................... 31 .
Precautions for Leak Detection Dye ...................... 14 . SELF-DIAGNOSTIC SYSTEM ........................... 31 . M
IDENTIFICATION ............................................... 14 . Description of Control System ............................... 32 .
IDENTIFICATION LABEL FOR VEHICLE .......... 14 . Control Operation .................................................. 33
.
Wiring Diagrams and Trouble Diagnosis ............... 14 . DISPLAY SCREEN ............................................. 33 .
PREPARATION ........................................................ 15
. AUTO.ECON SWITCH ....................................... 33 .
Special Service Tools ............................................ 15
. TEMPERATURE SWITCH (POTENTIO TEM-
HFC-134a (R-134a) Service Tools and Equipment 16 ... PERATURE CONTROL) .................................... 33 .
Commercial Service Tools ..................................... 18 . RECIRCULATION (REC) SWITCH .................... 33 .
REFRIGERATION SYSTEM .................................... 19 . FRESH (FRE) SWITCH ..................................... 33 .
Refrigerant Cycle .................................................. 19
. DEFROSTER (DEF) SWITCH ............................ 33 .
REFRIGERANT FLOW ...................................... 19 . REAR WINDOW DEFOGGER SWITCH ............ 33 .
FREEZE PROTECTION .................................... 19 . OFF SWITCH ..................................................... 34
.
Refrigerant System Protection .............................. 19 . A/C SWITCH ...................................................... 34
.
REFRIGERANT PRESSURE SENSOR ............ 19 . MODE SWITCH ................................................. 34 .
PRESSURE RELIEF VALVE .............................. 19 . FAN SWITCHES ................................................ 34 .
V-6 Variable Displacement Compressor ................ 20 . DUAL SWITCH (WITH LEFT AND RIGHT VEN-
GENERAL INFORMATION ................................ 20 . TILATION TEMPERATURE SEPARATELY
ATC-1
CONTROL SYSTEM) ......................................... 34 . DOOR .................................................................75
.
Fail-Safe Function ................................................. 34. Air Mix Door Motor PBR Circuit .............................75 .
Discharge Air Flow ................................................ 35 . DIAGNOSTIC PROCEDURE FOR AIR MIX
System Description ................................................ 36 . DOOR PBR .........................................................75 .
SWITCHES AND THEIR CONTROL FUNCTION 36 ... Intake Door Motor Circuit .......................................76 .
CAN Communication System Description ............. 37 . INSPECTION FLOW ...........................................76 .
TROUBLE DIAGNOSIS ........................................... 38 . SYSTEM DESCRIPTION ....................................77 .
CONSULT-II ........................................................... 38
. COMPONENT DESCRIPTION ...........................78 .
CONSULT-II BASIC OPERATION ...................... 38 . DIAGNOSTIC PROCEDURE FOR INTAKE
DATA MONITOR ................................................. 38 . DOOR MOTOR ...................................................78 .
How to Perform Trouble Diagnosis for Quick and Blower Motor Circuit ...............................................79 .
Accurate Repair ..................................................... 40
. INSPECTION FLOW ...........................................79 .
WORK FLOW ..................................................... 40 . SYSTEM DESCRIPTION ....................................80 .
SYMPTOM TABLE ............................................. 40 . COMPONENT DESCRIPTION ...........................81 .
Component Parts and Harness Connector Location 41 ... DIAGNOSTIC PROCEDURE FOR BLOWER
ENGINE COMPARTMENT ................................. 41 . MOTOR ...............................................................81.
PASSENGER COMPARTMENT ......................... 42 . COMPONENT INSPECTION ..............................83 .
Schematic .............................................................. 43
. Magnet Clutch Circuit .............................................84 .
Wiring Diagram --A/C-- ........................................ 44 . INSPECTION FLOW ...........................................84 .
Auto Amp. Terminals and Reference Value ........... 49 . SYSTEM DESCRIPTION ....................................85 .
PIN CONNECTOR TERMINAL LAYOUT ........... 49 . DIAGNOSTIC PROCEDURE FOR MAGNET
TERMINALS AND REFERENCE VALUE FOR CLUTCH .............................................................85 .
DISPLAY AND A/C AUTO AMP. ......................... 49 . COMPONENT INSPECTION ..............................90 .
Self-diagnosis Function ......................................... 52 . Insufficient Cooling .................................................91 .
DESCRIPTION ................................................... 52 . INSPECTION FLOW ...........................................91 .
FUNCTION CONFIRMATION PROCEDURE ..... 53 . PERFORMANCE TEST DIAGNOSIS .................92 .
AUXILIARY MECHANISM: TEMPERATURE PERFORMANCE CHART ...................................94 .
SETTING TRIMMER .......................................... 59 . TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
AUXILIARY MECHANISM: FOOT POSITION SURE ..................................................................96
.
SETTING TRIMMER .......................................... 60 . DIAGNOSTIC PROCEDURE FOR INSUFFI-
AUXILIARY MECHANISM: INLET PORT MEM- CIENT COOLING ................................................98 .
ORY FUNCTION ................................................ 60 . Insufficient Heating .............................................. 100 .
Operational Check ................................................. 61 . INSPECTION FLOW ......................................... 100 .
CHECKING MEMORY FUNCTION .................... 61 . Noise .................................................................... 101
.
CHECKING BLOWER ........................................ 61 . INSPECTION FLOW ......................................... 101 .
CHECKING DISCHARGE AIR ........................... 61 . Self-diagnosis ...................................................... 102.
CHECKING RECIRCULATION ........................... 62 . INSPECTION FLOW ......................................... 102 .
CHECKING TEMPERATURE DECREASE ........ 62 . Memory Function ................................................. 103 .
CHECKING TEMPERATURE INCREASE ......... 62 . INSPECTION FLOW ......................................... 103 .
CHECK A/C SWITCH ......................................... 62 . Ambient Sensor Circuit ........................................ 103 .
CHECKING AUTO. ECON MODE ...................... 63 . COMPONENT DESCRIPTION ......................... 103 .
Power Supply and Ground Circuit for Auto Amp. ... 63 AMBIENT TEMPERATURE INPUT PROCESS .104
INSPECTION FLOW .......................................... 63 . DIAGNOSTIC PROCEDURE FOR AMBIENT
COMPONENT DESCRIPTION ........................... 64 . SENSOR ........................................................... 104 .
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 64 ... COMPONENT INSPECTION ............................ 105 .
LAN System Circuit ............................................... 66 . In-vehicle Sensor Circuit ...................................... 106 .
DIAGNOSTIC PROCEDURE FOR LAN CIR- COMPONENT DESCRIPTION ......................... 106 .
CUIT ................................................................... 66
. DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
Mode Door Motor Circuit ....................................... 70 . SENSOR ........................................................... 106 .
INSPECTION FLOW .......................................... 70 . COMPONENT INSPECTION ............................ 108 .
SYSTEM DESCRIPTION ................................... 71 . Sunload Sensor Circuit ........................................ 108 .
COMPONENT DESCRIPTION ........................... 72 . COMPONENT DESCRIPTION ......................... 108 .
DIAGNOSTIC PROCEDURE FOR MODE SUNLOAD INPUT PROCESS .......................... 108 .
DOOR MOTOR .................................................. 72 . DIAGNOSTIC PROCEDURE FOR SUNLOAD
Air Mix Door Motor Circuit ..................................... 73 . SENSOR ........................................................... 109 .
INSPECTION FLOW .......................................... 73 . COMPONENT INSPECTION ............................ 110 .
SYSTEM DESCRIPTION ................................... 74 . Intake Sensor Circuit ............................................ 111 .
COMPONENT DESCRIPTION ........................... 75 . COMPONENT DESCRIPTION ......................... 111 .
DIAGNOSTIC PROCEDURE FOR AIR MIX DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
ATC-2
SOR .................................................................. 111
. AIR MIX DOOR MOTOR ........................................ 132 .
COMPONENT INSPECTION ............................113 . Removal and Installation ..................................... 132 . A
Multiplex Communication Circuit ..........................114 . REMOVAL ........................................................ 132 .
DIAGNOSTIC PROCEDURE FOR MULTIPLEX INSTALLATION ................................................ 132 .
COMMUNICATION ...........................................114 . DUCTS AND GRILLES .......................................... 133 . B
A/C AND AUDIO CONTROLLER ...........................116 . Removal and Installation ..................................... 133 .
Removal and Installation ......................................116 . REMOVAL ........................................................ 133 .
REMOVAL .........................................................116 . INSTALLATION ................................................ 135 .
INSTALLATION .................................................116 . REFRIGERANT LINES .......................................... 136 . C
Disassembly and Assembly .................................116 . HFC-134a (R-134a) Service Procedure .............. 136 .
AUTO AMP .............................................................117 . SETTING OF SERVICE TOOLS AND EQUIP-
Removal and Installation of Display and A/C Auto MENT ............................................................... 136
. D
Amp. .....................................................................117
. Components ........................................................ 138 .
REMOVAL .........................................................117 . Removal and Installation of Compressor ............. 138 .
INSTALLATION .................................................117 . REMOVAL ........................................................ 138 . E
Disassembly and Assembly .................................117 . INSTALLATION ................................................ 139 .
AMBIENT SENSOR ................................................118 . Removal and Installation of Compressor Clutch . 140
Removal and Installation ......................................118 . REMOVAL ........................................................ 140 .
REMOVAL .........................................................118 . INSTALLATION ................................................ 142 . F
INSTALLATION .................................................118 . Removal and Installation of Low-pressure Flexible
IN-VEHICLE SENSOR ............................................119 . Hose .................................................................... 143
.
Removal and Installation ......................................119 . REMOVAL ........................................................ 143 . G
REMOVAL .........................................................119 . INSTALLATION ................................................ 144 .
INSTALLATION .................................................119 . Removal and Installation of High-pressure Flexible
SUNLOAD SENSOR ............................................. 120 . Hose .................................................................... 144
. H
Removal and Installation ..................................... 120 . REMOVAL ........................................................ 144 .
REMOVAL ........................................................ 120 . INSTALLATION ................................................ 145 .
INSTALLATION ................................................ 120 . Removal and Installation of Low-pressure Pipe 1
I
INTAKE SENSOR .................................................. 121 . (Engine Compartment) ........................................ 145 .
Removal and Installation ..................................... 121 . REMOVAL ........................................................ 145 .
REMOVAL ........................................................ 121 . INSTALLATION ................................................ 146 .
INSTALLATION ................................................ 121 . Removal and Installation of High-pressure Pipe 1 ATC
BLOWER UNIT ...................................................... 122 . (Engine Compartment) ........................................ 146 .
Removal and Installation ..................................... 122 . REMOVAL ........................................................ 146 .
REMOVAL ........................................................ 122 . INSTALLATION ................................................ 146 . K
INSTALLATION ................................................ 122 . Removal and Installation of Low-pressure Pipe 2
Disassembly and Assembly ................................ 123 . and High-pressure Pipe 2 .................................... 147 .
BLOWER MOTOR ................................................. 124 . REMOVAL ........................................................ 147 . L
Removal and Installation ..................................... 124 . INSTALLATION ................................................ 148 .
REMOVAL ........................................................ 124 . Removal and Installation of Liquid Tank .............. 148 .
INSTALLATION ................................................ 124 . REMOVAL ........................................................ 148 .
INTAKE DOOR MOTOR ........................................ 125 . INSTALLATION ................................................ 149 . M
Removal and Installation ..................................... 125 . Removal and Installation of Condenser ............... 149 .
REMOVAL ........................................................ 125 . REMOVAL ........................................................ 149 .
INSTALLATION ................................................ 125 . INSTALLATION ................................................ 150 .
IN-CABIN MICROFILTER ...................................... 126 . Removal and Installation of Refrigerant Pressure
Removal and Installation ..................................... 126 . Sensor ................................................................. 151
.
FUNCTION ....................................................... 126 . REMOVAL ........................................................ 151 .
REPLACEMENT TIMING ................................. 126 . INSTALLATION ................................................ 151 .
REPLACEMENT PROCEDURES .................... 126 . Removal and Installation of Evaporator ............... 151 .
HEATER & COOLING UNIT ASSEMBLY ............. 127 . REMOVAL ........................................................ 151 .
Removal and Installation ..................................... 127 . INSTALLATION ................................................ 151 .
REMOVAL ........................................................ 127 . Removal and Installation of Expansion Valve ...... 152 .
INSTALLATION ................................................ 128 . REMOVAL ........................................................ 152 .
Disassembly and Assembly ................................ 129 . INSTALLATION ................................................ 152 .
MODE DOOR MOTOR .......................................... 131 . Checking for Refrigerant Leaks ........................... 153 .
Removal and Installation ..................................... 131 . Checking System for Leaks Using the Fluorescent
REMOVAL ........................................................ 131 . Leak Detector ...................................................... 153.
INSTALLATION ................................................ 131 .
ATC-3
Dye Injection ........................................................ 153
. Compressor ......................................................... 157
.
Electronic Refrigerant Leak Detector ................... 154 . Lubricant .............................................................. 157
.
PRECAUTIONS FOR HANDLING LEAK Refrigerant ........................................................... 157
.
DETECTOR ...................................................... 154. Engine Idling Speed ............................................. 157 .
CHECKING PROCEDURE ............................... 155 . Belt Tension ......................................................... 157
.
SERVICE DATA AND SPECIFICATIONS (SDS) ... 157 .
ATC-4
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" AJS001FM
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) AJS00118
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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