Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti M45 M35 Y50 2006-2007 Approved M45_M35-Y50-2007 atc
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AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
A
SECTION
AUTOMATIC AIR CONDITIONER
ATC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 5
. Variable Displacement Compressor ...................... 21 . F
Precautions for Supplemental Restraint System GENERAL INFORMATION ................................ 21 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- DESCRIPTION ................................................... 22 .
SIONER" ................................................................. 5
. Component Layout ................................................ 25 . G
Precautions Necessary for Steering Wheel Rotation LUBRICANT ............................................................. 26
.
After Battery Disconnect ......................................... 5. Maintenance of Lubricant Quantity in Compressor 26 ...
OPERATION PROCEDURE ................................ 5 . LUBRICANT ....................................................... 26 .
H
Precautions for Procedures without Cowl Top Cover 6 ..... LUBRICANT RETURN OPERATION ................. 26 .
Precautions for Working with HFC-134a (R-134a) 6 ..... LUBRICANT ADJUSTING PROCEDURE FOR
CONTAMINATED REFRIGERANT ...................... 7 . COMPONENTS REPLACEMENT EXCEPT
General Refrigerant Precautions ............................. 7 . COMPRESSOR ................................................. 27 . I
Precautions for Refrigerant Connection .................. 7 . LUBRICANT ADJUSTING PROCEDURE FOR
ABOUT ONE-TOUCH JOINT ............................... 7 . COMPRESSOR REPLACEMENT ...................... 27 .
FEATURES OF NEW TYPE REFRIGERANT AIR CONDITIONER CONTROL .............................. 29 . ATC
CONNECTION ................................................... 10 . Description of Air Conditioner LAN Control System 29 ...
O-RING AND REFRIGERANT CONNECTION... 10 System Construction ............................................. 29 .
Precautions for Servicing Compressor .................. 12 . OPERATION ....................................................... 30 .
K
Precautions for Service Equipment ....................... 13 . TRANSMISSION DATA AND TRANSMISSION
RECOVERY/RECYCLING EQUIPMENT ........... 13 . ORDER .............................................................. 30
.
ELECTRICAL LEAK DETECTOR ...................... 13 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
VACUUM PUMP ................................................ 13 . PERATURE CONTROL) .................................... 31 . L
MANIFOLD GAUGE SET ................................... 13 . FAN SPEED CONTROL ..................................... 31 .
SERVICE HOSES .............................................. 14 . INTAKE DOOR CONTROL ................................ 31 .
SERVICE COUPLERS ....................................... 14 . MODE DOOR CONTROL .................................. 31 . M
REFRIGERANT WEIGHT SCALE ..................... 14 . UPPER VENTILATOR DOOR CONTROL ......... 31 .
CHARGING CYLINDER ..................................... 14 . MAGNET CLUTCH CONTROL .......................... 32 .
Precautions for Leak Detection Dye ...................... 15 . SELF-DIAGNOSIS SYSTEM ............................. 32 .
IDENTIFICATION ............................................... 15 . Description of Control System ............................... 33 .
IDENTIFICATION LABEL FOR VEHICLE .......... 15 . Control Operation .................................................. 33.
PREPARATION ........................................................ 16
. DISPLAY SCREEN ............................................. 33 .
Special Service Tools ............................................ 16
. MULTIFUNCTION SWITCH ............................... 34 .
HFC-134a (R-134a) Service Tools and Equipment 17 ... DISPLAY SCREEN ............................................. 34 .
Commercial Service Tools ..................................... 19 . MODE SWITCH (DRIVER SIDE) ....................... 34 .
REFRIGERATION SYSTEM .................................... 20 . MODE SWITCH (PASSENGER SIDE) ............... 34 .
Refrigerant Cycle .................................................. 20
. TEMPERATURE CONTROL SWITCH (POTEN-
REFRIGERANT FLOW ...................................... 20 . TIO TEMPERATURE CONTROL) (DRIVER
FREEZE PROTECTION .................................... 20 . SIDE) .................................................................. 34
.
Refrigerant System Protection .............................. 20 . TEMPERATURE CONTROL SWITCH (POTEN-
REFRIGERANT PRESSURE SENSOR ............ 20 . TIO TEMPERATURE CONTROL) (PASSEN-
PRESSURE RELIEF VALVE .............................. 20 . GER SIDE) ......................................................... 34
.
Revision: 2007 April ATC-1 2007 M35/M45
AUTO SWITCH .................................................. 34 . DIAGNOSIS PROCEDURE FOR A/C SYSTEM...68
DEFROSTER (DEF) SWITCH ............................ 34 . Rear Control Switch Circuit ....................................70 .
UPPER VENT SWITCH ..................................... 34 . DIAGNOSIS PROCEDURE FOR REAR CON-
A/C SWITCH ...................................................... 35
. TROL SWITCH ...................................................70 .
FAN SWITCHES ................................................. 35 . LAN System Circuit ................................................71 .
OFF SWITCH ..................................................... 35. DIAGNOSIS PROCEDURE FOR LAN CIRCUIT...71
REAR WINDOW DEFOGGER SWITCH ............ 35 . Mode Door Motor Circuit ........................................76 .
INTAKE SWITCH ................................................ 35 . INSPECTION FLOW ...........................................76 .
DUAL SWITCH ................................................... 35 . SYSTEM DESCRIPTION ....................................77 .
Control Operation (Rear Control Switch) ............... 35 . COMPONENT DESCRIPTION ...........................78 .
AUTO SWITCH .................................................. 35 . DIAGNOSIS PROCEDURE FOR MODE DOOR
FAN SWITCH ..................................................... 35. MOTOR ...............................................................78.
REAR TEMPERATURE CONTROL SWITCH .... 36 . Upper Ventilator Door Motor Circuit .......................79 .
Fail-Safe Function ................................................. 36
. INSPECTION FLOW ...........................................79 .
Discharge Air Flow ................................................ 37
. SYSTEM DESCRIPTION ....................................80 .
System Description ................................................ 38
. COMPONENT DESCRIPTION ...........................81 .
SWITCHES AND THEIR CONTROL FUNCTION 38 ... DIAGNOSIS PROCEDURE FOR UPPER VEN-
CAN Communication System Description ............. 39 . TILATOR DOOR MOTOR ...................................81 .
TROUBLE DIAGNOSIS ........................................... 40 . Air Mix Door Motor Circuit ......................................82 .
CONSULT-II Function (ECM) ................................. 40 . INSPECTION FLOW ...........................................82 .
CONSULT-II BASIC OPERATION ...................... 40 . SYSTEM DESCRIPTION ....................................83 .
DATA MONITOR ................................................. 40 . COMPONENT DESCRIPTION ...........................84 .
How to Perform Trouble Diagnosis for Quick and DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
Accurate Repair ..................................................... 40
. MOTOR ...............................................................84.
WORK FLOW ..................................................... 40 . Air Mix Door Motor PBR Circuit .............................84 .
SYMPTOM TABLE ............................................. 41 . DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
Component Parts and Harness Connector Location 42 ... MOTOR PBR ......................................................84 .
ENGINE COMPARTMENT ................................. 42 . Intake Door Motor Circuit .......................................85 .
PASSENGER COMPARTMENT ......................... 43 . INSPECTION FLOW ...........................................85 .
Schematic .............................................................. 44
. SYSTEM DESCRIPTION ....................................86 .
Wiring Diagram --A/C-- ........................................ 46 . COMPONENT DESCRIPTION ...........................87 .
Auto Amp. Terminals and Reference Value ........... 54 . DIAGNOSIS PROCEDURE FOR INTAKE DOOR
PIN CONNECTOR TERMINAL LAYOUT ........... 54 . MOTOR ...............................................................87.
TERMINALS AND REFERENCE VALUE FOR Blower Motor Circuit ...............................................88 .
UNIFIED METER AND A/C AMP. ....................... 54 . INSPECTION FLOW ...........................................88 .
Self-diagnosis Function ......................................... 56 . SYSTEM DESCRIPTION ....................................89 .
DESCRIPTION ................................................... 56 . COMPONENT DESCRIPTION ...........................90 .
FUNCTION CONFIRMATION PROCEDURE ..... 57 . DIAGNOSIS PROCEDURE FOR BLOWER
AUXILIARY MECHANISM: TEMPERATURE MOTOR ...............................................................90.
SETTING TRIMMER .......................................... 63 . COMPONENT INSPECTION ..............................92 .
AUXILIARY MECHANISM: FOOT POSITION Magnet Clutch Circuit .............................................93 .
SETTING TRIMMER .......................................... 64 . INSPECTION FLOW ...........................................93 .
AUXILIARY MECHANISM: INLET PORT MEM- SYSTEM DESCRIPTION ....................................94 .
ORY FUNCTION ................................................ 64 . DIAGNOSIS PROCEDURE FOR MAGNET
Operational Check ................................................. 65
. CLUTCH .............................................................94 .
CHECKING MEMORY FUNCTION .................... 65 . COMPONENT INSPECTION ..............................97 .
CHECKING BLOWER ........................................ 65 . Insufficient Cooling .................................................98 .
CHECKING DISCHARGE AIR (MODE SWITCH INSPECTION FLOW ...........................................98 .
AND DEF SWITCH) ........................................... 65 . PERFORMANCE TEST DIAGNOSIS ............... 100 .
CHECKING DISCHARGE AIR (UPPER VENT PERFORMANCE CHART ................................. 102 .
SWITCH) ............................................................ 66
. TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
CHECKING INTAKE AIR .................................... 66 . SURE ................................................................ 104
.
CHECKING TEMPERATURE DECREASE ........ 66 . DIAGNOSIS PROCEDURE FOR INSUFFI-
CHECKING TEMPERATURE INCREASE ......... 66 . CIENT COOLING .............................................. 106 .
CHECKING A/C SWITCH .................................. 66 . Insufficient Heating .............................................. 108 .
CHECKING AUTO MODE .................................. 66 . INSPECTION FLOW ......................................... 108 .
Power Supply and Ground Circuit for Auto Amp. ... 67 Noise .................................................................... 109
.
INSPECTION FLOW .......................................... 67 . INSPECTION FLOW ......................................... 109 .
COMPONENT DESCRIPTION ........................... 68 . Self-diagnosis ...................................................... 110.
Revision: 2007 April ATC-2 2007 M35/M45
INSPECTION FLOW .........................................110 . INTAKE DOOR MOTOR ........................................ 132 .
Memory Function ................................................. 111 . Removal and Installation ..................................... 132 . A
INSPECTION FLOW ......................................... 111 . REMOVAL ........................................................ 132 .
Ambient Sensor Circuit ........................................112 . INSTALLATION ................................................ 132 .
COMPONENT DESCRIPTION .........................112 . IN-CABIN MICROFILTER ...................................... 133 . B
AMBIENT TEMPERATURE INPUT PROCESS..112 Removal and Installation ..................................... 133 .
DIAGNOSIS PROCEDURE FOR AMBIENT FUNCTION ....................................................... 133 .
SENSOR ...........................................................112
. REPLACEMENT TIMING ................................. 133 .
COMPONENT INSPECTION ............................114 . REPLACEMENT PROCEDURES .................... 133 . C
In-vehicle Sensor Circuit ......................................115 . HEATER & COOLING UNIT ASSEMBLY .............. 134 .
COMPONENT DESCRIPTION .........................115 . Removal and Installation ..................................... 134 .
DIAGNOSIS PROCEDURE FOR IN-VEHICLE REMOVAL ........................................................ 134 . D
SENSOR ...........................................................116
. INSTALLATION ................................................ 135 .
COMPONENT INSPECTION ............................117 . Disassembly and Assembly ................................. 137 .
Sunload Sensor Circuit ........................................118 . MODE DOOR MOTOR ........................................... 139 . E
COMPONENT DESCRIPTION .........................118 . Removal and Installation ..................................... 139 .
SUNLOAD INPUT PROCESS ..........................118 . REMOVAL ........................................................ 139 .
DIAGNOSIS PROCEDURE FOR SUNLOAD INSTALLATION ................................................ 139 .
SENSOR ...........................................................118
. AIR MIX DOOR MOTOR ........................................ 140 . F
COMPONENT INSPECTION ........................... 120 . Removal and Installation ..................................... 140 .
Intake Sensor Circuit ........................................... 121 . REMOVAL ........................................................ 140 .
COMPONENT DESCRIPTION ........................ 121 . INSTALLATION ................................................ 140 . G
DIAGNOSIS PROCEDURE FOR INTAKE SEN- UPPER VENTILATOR DOOR MOTOR ................. 141 .
SOR ................................................................. 121
. Removal and Installation ..................................... 141 .
COMPONENT INSPECTION ........................... 122 . REMOVAL ........................................................ 141 . H
CONTROLLER ...................................................... 123 . INSTALLATION ................................................ 141 .
Removal and Installation of Multifunction Switch . 123 HEATER CORE ...................................................... 142 .
REMOVAL ........................................................ 123. Removal and Installation ..................................... 142 .
I
INSTALLATION ................................................ 123 . REMOVAL ........................................................ 142 .
AUTO AMP ............................................................ 124
. INSTALLATION ................................................ 142 .
Removal and Installation of Unified Meter and A/C DUCTS AND GRILLES .......................................... 143 .
Auto Amp. ........................................................... 124
. Removal and Installation ..................................... 143 . ATC
REMOVAL ........................................................ 124. COMPONENT LAYOUT ................................... 143 .
INSTALLATION ................................................ 124 . REMOVAL ........................................................ 145 .
AMBIENT SENSOR ............................................... 125 . INSTALLATION ................................................ 149 . K
Removal and Installation ..................................... 125 . REFRIGERANT LINES .......................................... 150 .
REMOVAL ........................................................ 125. HFC-134a (R-134a) Service Procedure .............. 150 .
INSTALLATION ................................................ 125 . SETTING OF SERVICE TOOLS AND EQUIP- L
IN-VEHICLE SENSOR ........................................... 126 . MENT ............................................................... 150
.
Removal and Installation ..................................... 126 . Components ........................................................ 152 .
REMOVAL ........................................................ 126. VQ35DE ........................................................... 152.
INSTALLATION ................................................ 126 . VK45DE ............................................................ 153
. M
SUNLOAD SENSOR ............................................. 127 . Removal and Installation of Compressor ............. 153 .
Removal and Installation ..................................... 127 . REMOVAL ........................................................ 153 .
REMOVAL ........................................................ 127. INSTALLATION ................................................ 156 .
INSTALLATION ................................................ 127 . Check Disc to Pulley Clearance .......................... 156 .
INTAKE SENSOR .................................................. 128 . Removal and Installation of Low-pressure Flexible
Removal and Installation ..................................... 128 . Hose and Pipe ..................................................... 157 .
REMOVAL ........................................................ 128. REMOVAL ........................................................ 157 .
INSTALLATION ................................................ 128 . INSTALLATION ................................................ 157 .
BLOWER UNIT ...................................................... 129 . Removal and Installation of High-pressure Flexible
Removal and Installation ..................................... 129 . Hose .................................................................... 158
.
REMOVAL ........................................................ 129. REMOVAL ........................................................ 158 .
INSTALLATION ................................................ 129 . INSTALLATION ................................................ 159 .
Disassembly and Assembly ................................ 130 . Removal and Installation of High-pressure Pipe 1
BLOWER MOTOR ................................................. 131 . (Engine Compartment) ........................................ 159 .
Removal and Installation ..................................... 131 . REMOVAL ........................................................ 159 .
REMOVAL ........................................................ 131. INSTALLATION ................................................ 160 .
INSTALLATION ................................................ 131 . Removal and Installation of Low-pressure Pipe 1
Revision: 2007 April ATC-3 2007 M35/M45
and High-pressure Pipe 2 .................................... 161 . Removal and Installation of Expansion Valve ...... 168 .
REMOVAL ........................................................ 161 . REMOVAL ......................................................... 168.
INSTALLATION ................................................. 162 . INSTALLATION ................................................. 168 .
Removal and Installation of Liquid Tank .............. 163 . Checking for Refrigerant Leaks ........................... 169 .
DISASSEMBLY AND ASSEMBLY .................... 163 . Checking System for Leaks Using the Fluorescent
REMOVAL ........................................................ 163 . Leak Detector ....................................................... 169
.
INSTALLATION ................................................. 164 . Dye Injection ........................................................ 169
.
Removal and Installation of Condenser ............... 164 . Electrical Leak Detector ....................................... 170 .
REMOVAL ........................................................ 164 . PRECAUTIONS FOR HANDLING LEAK
INSTALLATION ................................................. 166 . DETECTOR ...................................................... 170 .
Removal and Installation of Refrigerant Pressure CHECKING PROCEDURE ............................... 171 .
Sensor ................................................................. 166
. SERVICE DATA AND SPECIFICATIONS (SDS) ... 173 .
REMOVAL ........................................................ 166 . Compressor ......................................................... 173
.
INSTALLATION ................................................. 166 . Lubricant .............................................................. 173
.
Removal and Installation of Evaporator ............... 167 . Refrigerant ........................................................... 173
.
REMOVAL ........................................................ 167 . Engine Idling Speed ............................................. 173 .
INSTALLATION ................................................. 167 . Belt Tension ......................................................... 173
.
Revision: 2007 April ATC-4 2007 M35/M45
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" NJS000FN
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
NJS000FO
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: 2007 April ATC-5 2007 M35/M45
PRECAUTIONS
Precautions for Procedures without Cowl Top Cover NJS000FP
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) NJS000FQ
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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