Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti M45 Y34 2003-2004 Approved M45-Y34-2003 atc
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AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
A
SECTION
AUTOMATIC AIR CONDITIONER
ATC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 4
. DESCRIPTION ................................................... 18
. F
Precautions for Supplemental Restraint System Component Layout ................................................ 21
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- LUBRICANT ............................................................. 22
.
SIONER" ................................................................. 4
. Maintenance of Lubricant Quantity in Compressor 22 ... G
Precautions for Working with HFC-134a (R-134a) 4 ..... LUBRICANT ....................................................... 22
.
CONTAMINATED REFRIGERANT ...................... 4 . LUBRICANT RETURN OPERATION ................. 22 .
General Refrigerant Precautions ............................. 5 . LUBRICANT ADJUSTING PROCEDURE FOR
H
Lubricant Precautions ............................................. 5
. COMPONENTS REPLACEMENT EXCEPT
Precautions for Refrigerant Connection .................. 5 . COMPRESSOR ................................................. 23 .
FEATURES OF NEW TYPE REFRIGERANT LUBRICANT ADJUSTING PROCEDURE FOR
CONNECTION ..................................................... 6. COMPRESSOR REPLACEMENT ...................... 23 . I
O-RING AND REFRIGERANT CONNECTION..... 7 AIR CONDITIONER CONTROL .............................. 25 .
Precautions for Servicing Compressor .................... 8 . Description of Air Conditioner LAN Control System 25 ...
Precautions for Service Equipment ......................... 9 . System Construction ............................................. 25
. ATC
RECOVERY/RECYCLING EQUIPMENT ............. 9 . OPERATION ....................................................... 26
.
ELECTRONIC LEAK DETECTOR ....................... 9 . TRANSMISSION DATA AND TRANSMISSION
VACUUM PUMP .................................................. 9 . ORDER .............................................................. 26
.
K
MANIFOLD GAUGE SET ..................................... 9 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
SERVICE HOSES ................................................ 9 . PERATURE CONTROL) .................................... 27 .
SERVICE COUPLERS ....................................... 10 . FAN SPEED CONTROL ..................................... 27 .
REFRIGERANT WEIGHT SCALE ..................... 10 . INTAKE DOOR CONTROL ................................ 27 . L
CALIBRATING ACR4 WEIGHT SCALE ............. 10 . OUTLET DOOR CONTROL ............................... 27 .
CHARGING CYLINDER ..................................... 10 . MAGNET CLUTCH CONTROL .......................... 28 .
Precautions for Leak Detection Dye .......................11 . SELF-DIAGNOSTIC SYSTEM ........................... 28 . M
IDENTIFICATION ................................................11 . Description of Control System ............................... 29 .
IDENTIFICATION LABEL FOR VEHICLE ...........11 . Control Operation .................................................. 30
.
Wiring Diagrams and Trouble Diagnosis ................11 . DISPLAY SCREEN ............................................. 30 .
PREPARATION ........................................................ 12
. AUTO SWITCH (DRIVER SIDE) ........................ 30 .
Special Service Tools ............................................ 12
. AUTO SWITCH (PASSENGER SIDE) ............... 30 .
HFC-134a (R-134a) Service Tools and Equipment 12 ... TEMPERATURE DIAL (POTENTIO TEMPERA-
Commercial Service Tools ..................................... 15 . TURE CONTROL) (DRIVER SIDE) .................... 30 .
REFRIGERATION SYSTEM .................................... 16 . TEMPERATURE DIAL (POTENTIO TEMPERA-
Refrigerant Cycle .................................................. 16
. TURE CONTROL) (PASSENGER SIDE) ........... 30 .
REFRIGERANT FLOW ...................................... 16 . INTAKE SWITCH ................................................ 31.
FREEZE PROTECTION .................................... 16 . DEFROSTER (DEF) SWITCH ............................ 31 .
Refrigerant System Protection .............................. 16 . OFF SWITCH ..................................................... 31
.
REFRIGERANT PRESSURE SENSOR ............ 16 . MODE SWITCH (DRIVER SIDE) ....................... 31 .
PRESSURE RELIEF VALVE .............................. 16 . MODE SWITCH (PASSENGER SIDE) ............... 31 .
V-6 Variable Displacement Compressor ................ 17 . ECON (ECONOMY) SWITCH ............................ 31 .
GENERAL INFORMATION ................................ 17 . FAN SWITCH ..................................................... 31
.
Revision; 2004 April ATC-1 2003 M45
DUAL SWITCH ................................................... 31 . DIAGNOSTIC PROCEDURE FOR INTAKE
FAIL-SAFE FUNCTION ......................................... 31 . DOOR MOTOR ...................................................74 .
Discharge Air Flow ................................................ 32 . Blower Motor Circuit ...............................................75 .
System Description ................................................ 33 . INSPECTION FLOW ...........................................75 .
SWITCHES AND THEIR CONTROL FUNCTION 33 ... SYSTEM DESCRIPTION ....................................76 .
TROUBLE DIAGNOSIS ........................................... 34 . COMPONENT DESCRIPTION ...........................77 .
How to Perform Trouble Diagnosis for Quick and DIAGNOSTIC PROCEDURE FOR BLOWER
Accurate Repair ..................................................... 34
. MOTOR ...............................................................77.
WORK FLOW ..................................................... 34 . COMPONENT INSPECTION ..............................79 .
SYMPTOM TABLE ............................................. 34 . Magnet Clutch Circuit .............................................80 .
Component Parts and Harness Connector Location 35 ... INSPECTION FLOW ...........................................80 .
ENGINE COMPARTMENT ................................. 35 . SYSTEM DESCRIPTION ....................................81 .
PASSENGER COMPARTMENT ......................... 36 . DIAGNOSTIC PROCEDURE FOR MAGNET
Schematic .............................................................. 37
. CLUTCH .............................................................81 .
Wiring Diagram --A/C-- ........................................ 38 . COMPONENT INSPECTION ..............................85 .
Auto Amp. Terminals and Reference Value ........... 47 . Insufficient Cooling .................................................86 .
PIN CONNECTOR TERMINAL LAYOUT ........... 47 . INSPECTION FLOW ...........................................86 .
TERMINALS AND REFERENCE VALUE FOR PERFORMANCE TEST DIAGNOSES ...............87 .
AUTO AMP. ........................................................ 47. PERFORMANCE CHART ...................................89 .
Self-diagnosis Function ......................................... 49 . TROUBLE DIAGNOSES FOR UNUSUAL PRES-
DESCRIPTION ................................................... 49 . SURE ..................................................................90
.
FUNCTION CONFIRMATION PROCEDURE ..... 50 . DIAGNOSTIC PROCEDURE FOR INSUFFI-
AUXILIARY MECHANISM: TEMPERATURE CIENT COOLING ................................................92 .
SETTING TRIMMER .......................................... 56 . Insufficient Heating ................................................94 .
Operational Check ................................................. 57 . INSPECTION FLOW ...........................................94 .
CHECKING MEMORY FUNCTION .................... 57 . Noise ......................................................................95
.
CHECKING BLOWER ........................................ 57 . INSPECTION FLOW ...........................................95 .
CHECKING DISCHARGE AIR ........................... 57 . Self-diagnosis ........................................................96.
CHECKING RECIRCULATION ........................... 58 . INSPECTION FLOW ...........................................96 .
CHECKING TEMPERATURE DECREASE ........ 58 . Memory Function ...................................................97 .
CHECKING TEMPERATURE INCREASE ......... 59 . INSPECTION FLOW ...........................................97 .
CHECK ECON (ECONOMY) MODE .................. 59 . ECON (Economy) Mode ........................................98 .
CHECKING AUTO MODE .................................. 59 . INSPECTION FLOW ...........................................98 .
Power Supply and Ground Circuit for Auto Amp. ... 60 Ambient Sensor Circuit ..........................................99 .
INSPECTION FLOW .......................................... 60 . COMPONENT DESCRIPTION ...........................99 .
COMPONENT DESCRIPTION ........................... 60 . AMBIENT TEMPERATURE INPUT PROCESS ...99
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 61 ... DIAGNOSTIC PROCEDURE FOR AMBIENT
LAN System Circuit ............................................... 62 . SENSOR .............................................................99 .
DIAGNOSTIC PROCEDURE FOR LAN CIR- COMPONENT INSPECTION ............................ 101 .
CUIT ................................................................... 62
. In-Vehicle Sensor Circuit ...................................... 101 .
Mode Door Motor Circuit ....................................... 66 . COMPONENT DESCRIPTION ......................... 101 .
INSPECTION FLOW .......................................... 66 . DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
SYSTEM DESCRIPTION ................................... 67 . SENSOR ........................................................... 102 .
COMPONENT DESCRIPTION ........................... 68 . COMPONENT INSPECTION ............................ 103 .
DIAGNOSTIC PROCEDURE FOR MODE Sunload Sensor Circuit ........................................ 104 .
DOOR MOTOR .................................................. 68 . COMPONENT DESCRIPTION ......................... 104 .
Air Mix Door Motor Circuit ..................................... 69 . SUNLOAD INPUT PROCESS .......................... 104 .
INSPECTION FLOW .......................................... 69 . DIAGNOSTIC PROCEDURE FOR SUNLOAD
SYSTEM DESCRIPTION ................................... 70 . SENSOR ........................................................... 104 .
COMPONENT DESCRIPTION ........................... 71 . COMPONENT INSPECTION ............................ 106 .
DIAGNOSTIC PROCEDURE FOR AIR MIX Intake Sensor Circuit ............................................ 107 .
DOOR MOTOR .................................................. 71 . COMPONENT DESCRIPTION ......................... 107 .
Air Mix Door Motor PBR Circuit ............................. 71 . DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
DIAGNOSTIC PROCEDURE FOR AIR MIX SOR .................................................................. 107
.
DOOR MOTOR PBR .......................................... 71 . COMPONENT INSPECTION ............................ 108 .
Intake Door Motor Circuit ....................................... 72 . Multiplex Communication Circuit .......................... 109 .
INSPECTION FLOW .......................................... 72 . DIAGNOSTIC PROCEDURE FOR MULTIPLEX
SYSTEM DESCRIPTION ................................... 73 . COMMUNICATION CIRCUIT ........................... 109 .
COMPONENT DESCRIPTION ........................... 74 .
Revision; 2004 April ATC-2 2003 M45
CONTROL UNIT .....................................................112
. DUCTS AND GRILLES .......................................... 127 .
Removal and Installation ......................................112
. Removal and Installation ..................................... 127 . A
REMOVAL .........................................................112
. REMOVAL ........................................................ 127 .
INSTALLATION .................................................112
. INSTALLATION ................................................ 129 .
AMBIENT SENSOR ................................................113 . REFRIGERANT LINES .......................................... 130 . B
Removal and Installation ......................................113
. HFC-134a (R-134a) Service Procedure .............. 130 .
REMOVAL .........................................................113
. SETTING OF SERVICE TOOLS AND EQUIP-
INSTALLATION .................................................113
. MENT ............................................................... 130
.
IN-VEHICLE SENSOR ............................................114 . Components ........................................................ 132. C
Removal and Installation ......................................114
. Compressor ......................................................... 133
.
REMOVAL .........................................................114
. REMOVAL ........................................................ 133 .
INSTALLATION .................................................114
. INSTALLATION ................................................ 133 . D
SUNLOAD SENSOR ..............................................115 . Compressor Clutch .............................................. 134 .
Removal and Installation ......................................115
. REMOVAL ........................................................ 134 .
REMOVAL .........................................................115
. INSTALLATION ................................................ 136 . E
INSTALLATION .................................................115
. Low-Pressure Flexible Hose ................................ 137 .
INTAKE SENSOR ...................................................116
. REMOVAL ........................................................ 137 .
Removal and Installation ......................................116
. INSTALLATION ................................................ 138 .
REMOVAL .........................................................116
. High-Pressure Flexible Hose ............................... 138 . F
INSTALLATION .................................................116
. REMOVAL ........................................................ 138 .
BLOWER UNIT .......................................................117
. INSTALLATION ................................................ 138 .
Removal and Installation ......................................117
. High-Pressure Pipe ............................................. 139 . G
REMOVAL .........................................................117
. REMOVAL ........................................................ 139 .
INSTALLATION .................................................117
. INSTALLATION ................................................ 139 .
Disassembly and Assembly .................................118 . Refrigerant Pressure Sensor ............................... 139 . H
BLOWER MOTOR ..................................................119 . REMOVAL ........................................................ 139 .
Removal and Installation ......................................119
. INSTALLATION ................................................ 139 .
REMOVAL .........................................................119
. Condenser ........................................................... 140
.
I
INSTALLATION .................................................119
. REMOVAL ........................................................ 140 .
INTAKE DOOR MOTOR ........................................ 120 . INSTALLATION ................................................ 140 .
Removal and Installation ..................................... 120
. Liquid Tank .......................................................... 141
.
REMOVAL ........................................................ 120
. REMOVAL ........................................................ 141 . ATC
INSTALLATION ................................................ 120
. INSTALLATION ................................................ 141 .
IN-CABIN MICROFILTER ...................................... 121 . Evaporator ........................................................... 142
.
Removal and Installation ..................................... 121
. REMOVAL ........................................................ 142 . K
FUNCTION ....................................................... 121
. INSTALLATION ................................................ 142 .
REPLACEMENT TIMING ................................. 121 . Expansion Valve .................................................. 142 .
REPLACEMENT PROCEDURES .................... 121 . REMOVAL ........................................................ 142 . L
HEATER & COOLING UNIT ASSEMBLY ............. 122 . INSTALLATION ................................................ 143 .
Removal and Installation ..................................... 122
. Checking for Refrigerant Leaks ........................... 143 .
REMOVAL ........................................................ 122
. Checking System for Leaks Using the Fluorescent
INSTALLATION ................................................ 123
. Leak Detector ...................................................... 144
. M
Disassembly and Assembly ................................ 124 . Dye Injection ........................................................ 144
.
MODE DOOR MOTOR .......................................... 125 . Electronic Refrigerant Leak Detector ................... 144 .
Removal and Installation ..................................... 125
. PRECAUTIONS FOR HANDLING LEAK
REMOVAL ........................................................ 125
. DETECTOR ...................................................... 144 .
INSTALLATION ................................................ 125
. CHECKING PROCEDURE .............................. 145 .
AIR MIX DOOR MOTOR ........................................ 126 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 147 .
Removal and Installation ..................................... 126
. Compressor ......................................................... 147
.
REMOVAL ........................................................ 126
. Lubricant .............................................................. 147
.
INSTALLATION ................................................ 126
. Refrigerant ........................................................... 147
.
Engine Idling Speed ............................................ 147 .
Belt Tension ......................................................... 147
.
Revision; 2004 April ATC-3 2003 M45
PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" AJS00115
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) AJS0006S
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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