Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Altima 2000-2005 Approved Nissan Altima 2003 ATC
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J AIR CONDITIONER
A
B
SECTION
AUTOMATIC AIR CONDITIONER C
D
E
CONTENTS
PRECAUTIONS ......................................................... 4
. System Construction ............................................. 21
. F
Precautions for Supplemental Restraint System OPERATION ...................................................... 21
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- TRANSMISSION DATA AND TRANSMISSION
SIONER" ................................................................. 4
. ORDER .............................................................. 22
. G
Precautions for Working with HFC-134a (R-134a) 4 ..... AIR MIX DOOR CONTROL (AUTOMATIC TEM-
Contaminated Refrigerant ....................................... 4 . PERATURE CONTROL) .................................... 22 .
General Refrigerant Precautions ............................. 5 . FAN SPEED CONTROL .................................... 23 .
H
Precautions for Leak Detection Dye ........................ 5 . INTAKE DOOR CONTROL ................................ 23 .
A/C Identification Label ........................................... 5
. OUTLET DOOR CONTROL ............................... 23 .
Precautions for Refrigerant Connection .................. 6 . MAGNET CLUTCH CONTROL .......................... 23 .
FEATURES OF NEW TYPE REFRIGERANT SELF-DIAGNOSTIC SYSTEM ........................... 23 . I
CONNECTION ..................................................... 6. Overview of Control system ................................... 23 .
O-RING AND REFRIGERANT CONNECTION..... 7 Control Operation .................................................. 24
.
Precautions for Servicing Compressor .................... 9 . DISPLAY SCREEN ............................................ 24 . ATC
Precautions for Service Equipment ......................... 9 . AUTO SWITCH .................................................. 24.
RECOVERY/RECYCLING EQUIPMENT ............. 9 . ECON (ECONOMY) SWITCH ............................ 24 .
ELECTRONIC LEAK DETECTOR ....................... 9 . TEMPERATURE DIAL (POTENTIO TEMPERA-
K
VACUUM PUMP ................................................ 10 . TURE CONTROL) .............................................. 24 .
MANIFOLD GAUGE SET ................................... 10 . OFF SWITCH ..................................................... 24
.
SERVICE HOSES .............................................. 10 . FAN SWITCH ..................................................... 24
.
SERVICE COUPLERS ........................................11 . RECIRCULATION (REC) SWITCH .................... 24 . L
CHARGING CYLINDER ......................................11 . DEFROSTER (DEF) SWITCH ............................ 24 .
Wiring Diagrams and Trouble Diagnosis ................11 . MODE SWITCH ................................................. 24 .
PREPARATION ........................................................ 12
. REAR WINDOW DEFOGGER SWITCH ............ 24 . M
Special Service Tools ............................................ 12
. Discharge Air Flow ................................................ 25
.
HFC-134a (R-134a) Service Tools and Equipment 12 ... System Description ................................................ 26
.
Commercial Service Tools ..................................... 15 . SWITCHES AND THEIR CONTROL FUNCTION 26 ...
REFRIGERATION SYSTEM .................................... 16 . CAN Communication System Description ............. 26 .
Refrigerant Cycle .................................................. 16
. FOR TCS MODELS ........................................... 27 .
REFRIGERANT FLOW ...................................... 16 . FOR A/T MODELS ............................................. 28 .
Refrigerant System Protection .............................. 16 . FOR M/T MODELS ............................................ 29 .
REFRIGERANT PRESSURE SENSOR ............ 16 . TROUBLE DIAGNOSIS ........................................... 31 .
PRESSURE RELIEF VALVE ............................. 16 . How to Perform Trouble Diagnoses for Quick and
Component Layout ................................................ 17. Accurate Repair ..................................................... 31
.
LUBRICANT ............................................................ 18
. WORK FLOW ..................................................... 31
.
Maintenance of Lubricant Quantity in Compressor 18 ... SYMPTOM TABLE ............................................. 31 .
LUBRICANT ....................................................... 18
. Component Parts and Harness Connector Location 32 ...
CHECKING AND ADJUSTING .......................... 18 . ENGINE COMPARTMENT ................................. 32 .
AIR CONDITIONER CONTROL .............................. 21 . PASSENGER COPARTMENT ........................... 33 .
Overview Air Conditioner LAN Control System ..... 21 . Circuit Diagram ...................................................... 34
.
Revision: May 2004 ATC-1 2003 Altima
Wiring Diagram -- A/C,A -- .................................. 35 . INSPECTION FLOW ...........................................88 .
Auto Amp. Terminals and Reference Value ........... 39 . Memory Function ...................................................89
.
INSPECTION OF AUTO AMP. ........................... 39 . INSPECTION FLOW ...........................................89 .
A/C AUTO AMP. HARNESS CONNECTOR TER- ECON (ECONOMY) Mode .....................................90 .
MINAL LAYOUT ................................................. 39 . INSPECTION FLOW ...........................................90 .
AUTO AMP. INSPECTION TABLE ..................... 39 . Ambient Sensor Circuit ..........................................90.
Self-diagnosis ........................................................ 41
. COMPONENT DESCRIPTION ...........................90 .
DESCRIPTION ................................................... 41 . AMBIENT TEMPERATURE INPUT PROCESS ...90
FUNCTION CONFIRMATION PROCEDURE ..... 42 . DIAGNOSTIC PROCEDURE ..............................91 .
AUXILIARY MECHANISM: TEMPERATURE COMPONENT INSPECTION ..............................92 .
SETTING TRIMMER .......................................... 48 . In-vehicle Sensor Circuit ........................................92
.
Operational Check ................................................. 49 . COMPONENT DESCRIPTION ...........................92 .
CONDITIONS: .................................................... 49 . DIAGNOSTIC PROCEDURE ..............................93 .
PROCEDURE: .................................................... 49 . COMPONENT INSPECTION ..............................95 .
Power Supply and Ground Circuit for Auto Amp. ... 52 Sunload Sensor Circuit ..........................................95.
COMPONENT DESCRIPTION ........................... 52 . COMPONENT DESCRIPTION ...........................95 .
DIAGNOSTIC PROCEDURE ............................. 53 . SUNLOAD INPUT PROCESS ............................95 .
LAN System Circuit ............................................... 54 . DIAGNOSTIC PROCEDURE ..............................96 .
DIAGNOSTIC PROCEDURE ............................. 54 . COMPONENT INSPECTION ..............................97 .
Mode Door Motor Circuit ....................................... 58 . Intake Sensor Circuit ..............................................98
.
INSPECTION FLOW .......................................... 58 . COMPONENT DESCRIPTION ...........................98 .
SYSTEM DESCRIPTION ................................... 59 . DIAGNOSTIC PROCEDURE ..............................99 .
COMPONENT DESCRIPTION ........................... 60 . AUTO AMP ............................................................. 101
.
DIAGNOSTIC PROCEDURE ............................. 60 . Removal and Installation ...................................... 101.
MODE DOOR ..................................................... 60 . AMBIENT SENSOR ............................................... 102 .
Air Mix Door Motor Circuit ..................................... 61 . Removal and Installation ...................................... 102.
INSPECTION FLOW .......................................... 61 . IN-VEHICLE SENSOR ........................................... 103 .
SYSTEM DESCRIPTION ................................... 62 . Removal and Installation ...................................... 103.
COMPONENT DESCRIPTION ........................... 63 . SUNLOAD SENSOR .............................................. 104 .
DIAGNOSTIC PROCEDURE ............................. 63 . Removal and Installation ...................................... 104.
AIR MIX DOOR .................................................. 63 . INTAKE SENSOR ................................................... 105.
Intake Door Motor Circuit ....................................... 64 . Removal and Installation ...................................... 105.
INSPECTION FLOW .......................................... 64 . THERMO CONTROL AMPLIFIER ......................... 106 .
SYSTEM DESCRIPTION ................................... 65 . Removal and Installation ...................................... 106.
COMPONENT DESCRIPTION ........................... 66 . BLOWER UNIT ....................................................... 107
.
INTAKE DOOR ................................................... 66 . Removal and Installation ...................................... 107.
DIAGNOSTIC PROCEDURE ............................. 66 . REMOVAL ........................................................ 107
.
Blower Motor Circuit .............................................. 67 . BLOWER MOTOR .................................................. 108 .
INSPECTION FLOW .......................................... 67 . Removal and Installation ...................................... 108.
SYSTEM DESCRIPTION ................................... 68 . INTAKE DOOR MOTOR ......................................... 109 .
COMPONENT DESCRIPTION ........................... 69 . Removal and Installation ...................................... 109.
DIAGNOSTIC PROCEDURE ............................. 69 . IN-CABIN MICROFILTER ....................................... 110 .
COMPONENT INSPECTION ............................. 72 . Removal and Installation ...................................... 110.
Magnet Clutch Circuit ............................................ 73 . FUNCTION ....................................................... 110
.
INSPECTION FLOW .......................................... 73 . REPLACEMENT TIMING ................................. 110 .
SYSTEM DESCRIPTION ................................... 74 . REPLACEMENT PROCEDURES ..................... 110 .
DIAGNOSTIC PROCEDURE ............................. 74 . HEATER & COOLING UNIT ASSEMBLY .............. 111 .
COMPONENT INSPECTION ............................. 78 . Removal and Installation ...................................... 111.
Insufficient Cooling ................................................ 79. REMOVAL ........................................................ 111
.
INSPECTION FLOW .......................................... 79 . INSTALLATION ................................................ 111.
PERFORMANCE TEST ANALYSIS ................... 80 . HEATER CORE ...................................................... 112
.
PERFORMANCE CHART .................................. 82 . Removal and Installation ...................................... 112.
TROUBLE DIAGNOSIS FOR ABNORMAL MODE DOOR MOTOR ........................................... 113 .
PRESSURE ........................................................ 82 . Removal and Installation ...................................... 113.
Insufficient Heating ................................................ 86. AIR MIX DOOR MOTOR ........................................ 114 .
INSPECTION FLOW .......................................... 86 . Removal and Installation ...................................... 114.
Noise ..................................................................... 87
. FAN CONTROL AMPLIFIER .................................. 115 .
INSPECTION FLOW .......................................... 87 . Removal and Installation ...................................... 115.
Self-diagnosis ........................................................ 88
. DUCTS AND GRILLES .......................................... 116 .
Revision: May 2004 ATC-2 2003 Altima
Removal and Installation ......................................116 . REMOVAL ........................................................ 125 .
Ventilator Duct, Defroster Nozzle and Defroster INSTALLATION ................................................ 125 . A
Ducts ....................................................................116
. Removal and Installation for Refrigerant Pressure
Center Ventilator Grille .........................................116 . Sensor ................................................................. 125
.
Side Ventilator Grille LH .......................................116 . Removal and Installation for Condenser ............. 125 . B
Side Ventilator Grille RH ......................................117 . REMOVAL ........................................................ 125 .
Floor duct .............................................................117
. INSTALLATION ................................................ 126 .
REFRIGERANT LINES ...........................................118 . Removal and Installation for Evaporator ............. 126 .
HFC-134a (R-134a) Service Procedure ...............118 . REMOVAL ........................................................ 126 . C
SETTING OF SERVICE TOOLS AND EQUIP- INSTALLATION ................................................ 127 .
MENT ................................................................118
. Removal and Installation for Expansion Valve ..... 127 .
Components ........................................................ 120 . REMOVAL ........................................................ 127 . D
Removal and Installation for Compressor ........... 121 . INSTALLATION ................................................ 128 .
REMOVAL ........................................................ 121 . Checking for Refrigerant Leaks ........................... 128 .
INSTALLATION ................................................ 121 . Checking System for Leaks Using the Fluorescent E
Removal and Installation for Compressor Clutch . 122 Leak Detector ...................................................... 128
.
REMOVAL ........................................................ 122 . Dye Injection ........................................................ 129
.
INSPECTION ................................................... 123 . Electronic Refrigerant Leak Detector ................... 129 .
INSTALLATION ................................................ 123 . PRECAUTIONS FOR HANDLING LEAK F
BREAK-IN OPERATION .................................. 124 . DETECTOR ...................................................... 129 .
Removal and Installation for Low-pressure Flexible CHECKING PROCEDURE .............................. 130 .
Hose .................................................................... 124
. SERVICE DATA AND SPECIFICATIONS (SDS) ... 132 . G
REMOVAL ........................................................ 124 . Service Data and Specifications (SDS) ............... 132 .
INSTALLATION ................................................ 124 . COMPRESSOR ............................................... 132 .
Removal and Installation for High-pressure Flexible LUBRICANT ..................................................... 132 . H
Hose .................................................................... 125
. REFRIGERANT ................................................ 132 .
REMOVAL ........................................................ 125 . ENGINE IDLING SPEED ................................. 132 .
INSTALLATION ................................................ 125 . BELT TENSION ................................................ 132 .
I
Removal and Installation for High-pressure Pipe . 125
ATC
K
L
M
Revision: May 2004 ATC-3 2003 Altima
PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS001GD
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) EJS001C0
WARNING:
q CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed compressor failure is likely to occur. Refer ATC-4, "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.
q Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-
nents. If lubricant other than that specified is used, compressor failure is likely to occur.
q The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
lowing handling precautions must be observed:
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