
AT-326
REPAIR FOR COMPONENT PARTS
Revision: 2005 July 2005 FX
Direct ClutchACS0081R
COMPONENTS
VQ35DE models
VK45DE models
SCIA5046E
1. Direct clutch drum 2. Driven plate 3. Retaining plate
4. Snap ring 5. Drive plate
SCIA5226E
1. Direct clutch drum 2. Driven plate 3. Retaining plate
4. Snap ring 5. Drive plate

REPAIR FOR COMPONENT PARTS AT-327
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DISASSEMBLY
1. Using a flat-bladed screwdriver, remove snap ring from direct
clutch drum.
2. Remove drive plates, driven plates and retaining plate from direct clutch drum.
INSPECTION
Check the following, and replace direct clutch assembly if necessary.
Direct Clutch Snap Ring
Check for deformation, fatigue or damage.
Direct Clutch Drive Plates
Check facing for burns, cracks or damage.
Direct Clutch Retaining Plates and Driven Plates
Check facing for burns, cracks or damage.
ASSEMBLY
1. Install drive plates, driven plates and retaining plate in direct clutch drum.
CAUTION:
Take care with order of plates.
2. Using a flat-bladed screwdriver, install snap ring in direct clutch drum.
SCIA2868E
SCIA2868E

ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
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AUTOMATIC AIR CONDITIONER
PRECAUTIONS .......................................................... 5
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 5
Precautions Necessary for Steering Wheel Rotation
After Battery Disconnect ..................................... ..... 5
OPERATION PROCEDURE ............................ ..... 5
Precautions for Procedures without Cowl Top Cover ..... 6
Precautions for Working with HFC-134a (R-134a) ..... 6
CONTAMINATED REFRIGERANT .................. ..... 7
General Refrigerant Precautions ......................... ..... 7
Precautions for Refrigerant Connection .............. ..... 8
ABOUT ONE-TOUCH JOINT ........................... ..... 8
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ................................................. ... 10
O-RING AND REFRIGERANT CONNECTION .... 11
Precautions for Servicing Compressor ................ ... 13
Precautions for Service Equipment ..................... ... 13
RECOVERY/RECYCLING EQUIPMENT ......... ... 13
ELECTRONIC LEAK DETECTOR ................... ... 13
VACUUM PUMP .............................................. ... 14
MANIFOLD GAUGE SET ................................. ... 14
SERVICE HOSES ............................................ ... 14
SERVICE COUPLERS ..................................... ... 15
REFRIGERANT WEIGHT SCALE ................... ... 15
CHARGING CYLINDER ................................... ... 15
Precautions for Leak Detection Dye .................... ... 16
IDENTIFICATION ............................................. ... 16
IDENTIFICATION LABEL FOR VEHICLE ........ ... 16
PREPARATION ...................................................... ... 17
Special Service Tools .......................................... ... 17
HFC-134a (R-134a) Service Tools and Equipment ... 18
Commercial Service Tools ................................... ... 20
REFRIGERATION SYSTEM .................................. ... 21
Refrigerant Cycle ................................................ ... 21
REFRIGERANT FLOW .................................... ... 21
FREEZE PROTECTION .................................. ... 21
Refrigerant System Protection ............................ ... 21
REFRIGERANT PRESSURE SENSOR .......... ... 21
PRESSURE RELIEF VALVE ............................ ... 21 V-6 Variable Displacement Compressor ..............
... 22
GENERAL INFORMATION .............................. ... 22
DESCRIPTION ................................................. ... 23
Component Layout .............................................. ... 26
LUBRICANT ........................................................... ... 27
Maintenance of Lubricant Quantity in Compressor ... 27
LUBRICANT ..................................................... ... 27
LUBRICANT RETURN OPERATION ............... ... 27
LUBRICANT ADJUSTING PROCEDURE FOR
COMPONENTS REPLACEMENT EXCEPT
COMPRESSOR ............................................... ... 28
LUBRICANT ADJUSTING PROCEDURE FOR
COMPRESSOR REPLACEMENT .................... ... 29
AIR CONDITIONER CONTROL ............................ ... 30
Description of Air Conditioner LAN Control System ... 30
System Construction ........................................... ... 30
OPERATION ..................................................... ... 30
TRANSMISSION DATA AND TRANSMISSION
ORDER ............................................................ ... 31
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL) .................................. ... 32
FAN SPEED CONTROL ................................... ... 32
INTAKE DOOR CONTROL .............................. ... 32
OUTLET DOOR CONTROL ............................. ... 32
MAGNET CLUTCH CONTROL ........................ ... 33
SELF-DIAGNOSIS SYSTEM ........................... ... 33
Description of Control System ............................. ... 34
Control Operation ................................................ ... 34
DISPLAY SCREEN ........................................... ... 34
AUTO SWITCH ................................................ ... 35
TEMPERATURE SWITCH (POTENTIO TEM-
PERATURE CONTROL) (DRIVER SIDE) ........ ... 35
TEMPERATURE SWITCH (POTENTIO TEM-
PERATURE CONTROL) (PASSENGER SIDE) ... 35
RECIRCULATION (REC) SWITCH .................. ... 35
FRESH (FRE) SWITCH ................................... ... 35
DEFROSTER (DEF) SWITCH .......................... ... 35
REAR WINDOW DEFOGGER SWITCH .......... ... 35
OFF SWITCH ................................................... ... 35
A/C SWITCH .................................................... ... 35

ATC-2Revision: 2005 July 2005 FX
MODE SWITCH ................................................
... 35
FAN SWITCH ................................................... ... 35
DUAL SWITCH (WITH LEFT AND RIGHT VEN-
TILATION TEMPERATURE SEPARATELY
CONTROL SYSTEM) ....................................... ... 35
Fail-safe Function ................................................ ... 36
Discharge Air Flow .............................................. ... 37
System Description .............................................. ... 38
SWITCHES AND THEIR CONTROL FUNCTION ... 38
CAN Communication System Description ........... ... 39
TROUBLE DIAGNOSIS ......................................... ... 40
CONSULT-II Function (BCM) ............................... ... 40
CONSULT-II BASIC OPERATION .................... ... 40
DATA MONITOR ............................................... ... 41
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ................................................... ... 42
WORK FLOW ................................................... ... 42
SYMPTOM TABLE ........................................... ... 42
Component Parts and Harness Connector Location ... 43
ENGINE COMPARTMENT ............................... ... 43
PASSENGER COMPARTMENT ....................... ... 44
Schematic ............................................................ ... 45
Wiring Diagram —A/C— ...................................... ... 46
Auto Amp. Terminals and Reference Value ......... ... 51
PIN CONNECTOR TERMINAL LAYOUT ......... ... 51
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ..................... ... 51
Self-diagnosis Function ....................................... ... 53
DESCRIPTION ................................................. ... 53
FUNCTION CONFIRMATION PROCEDURE ... ... 54
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................ ... 59
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................ ... 60
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION .............................................. ... 60
Operational Check ............................................... ... 61
CHECKING MEMORY FUNCTION .................. ... 61
CHECKING BLOWER ...................................... ... 61
CHECKING DISCHARGE AIR ......................... ... 61
CHECKING INTAKE AIR .................................. ... 62
CHECKING TEMPERATURE DECREASE ...... ... 62
CHECKING TEMPERATURE INCREASE ....... ... 62
CHECK A/C SWITCH ....................................... ... 62
CHECKING AUTO MODE ................................ ... 63
Power Supply and Ground Circuit for Auto Amp. ... 63 INSPECTION FLOW ........................................ ... 63
COMPONENT DESCRIPTION ......................... ... 64
DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 64
LAN System Circuit ............................................. ... 66
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 66
Mode Door Motor Circuit ..................................... ... 70
INSPECTION FLOW ........................................ ... 70
SYSTEM DESCRIPTION ................................. ... 71
COMPONENT DESCRIPTION ......................... ... 72
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR ............................................................ ... 72
Air Mix Door Motor Circuit ................................... ... 73
INSPECTION FLOW ........................................ ... 73 SYSTEM DESCRIPTION ..................................
... 74
COMPONENT DESCRIPTION ......................... ... 75
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR ............................................................. ... 75
Air Mix Door Motor PBR Circuit ........................... ... 75
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR PBR .................................................... ... 75
Intake Door Motor Circuit ..................................... ... 76
INSPECTION FLOW ......................................... ... 76
SYSTEM DESCRIPTION .................................. ... 77
COMPONENT DESCRIPTION ......................... ... 78
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR ............................................................. ... 78
Blower Motor Circuit ............................................. ... 79
INSPECTION FLOW ......................................... ... 79
SYSTEM DESCRIPTION .................................. ... 80
COMPONENT DESCRIPTION ......................... ... 81
DIAGNOSIS PROCEDURE FOR BLOWER
MOTOR ............................................................. ... 81
COMPONENT INSPECTION ............................ ... 83
Magnet Clutch Circuit ........................................... ... 84
INSPECTION FLOW ......................................... ... 84
SYSTEM DESCRIPTION .................................. ... 85
DIAGNOSIS PROCEDURE FOR MAGNET
CLUTCH ........................................................... ... 85
COMPONENT INSPECTION ............................ ... 90
Insufficient Cooling ............................................... ... 91
INSPECTION FLOW ......................................... ... 91
PERFORMANCE TEST DIAGNOSIS ............... ... 93
PERFORMANCE CHART ................................. ... 95
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE ................................................................ ... 96
DIAGNOSIS PROCEDURE FOR INSUFFI-
CIENT COOLING .............................................. ... 98
Insufficient Heating .............................................. .100
INSPECTION FLOW ......................................... .100
Noise .................................................................... .101
INSPECTION FLOW ......................................... .101
Self-diagnosis ...................................................... .102
INSPECTION FLOW ......................................... .102
Memory Function ................................................. .103
INSPECTION FLOW ......................................... .103
Ambient Sensor Circuit ........................................ .104
COMPONENT DESCRIPTION ......................... .104
AMBIENT TEMPERATURE INPUT PROCESS .104
DIAGNOSIS PROCEDURE FOR AMBIENT
SENSOR ........................................................... .104
COMPONENT INSPECTION ............................ .106
In-vehicle Sensor Circuit ...................................... .107
COMPONENT DESCRIPTION ......................... .107
DIAGNOSIS PROCEDURE FOR IN-VEHICLE
SENSOR ........................................................... .108
COMPONENT INSPECTION ............................ .109
Sunload Sensor Circuit ........................................ .110
COMPONENT DESCRIPTION ......................... .110
SUNLOAD INPUT PROCESS .......................... .110
DIAGNOSIS PROCEDURE FOR SUNLOAD
SENSOR ........................................................... .110

ATC-3
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COMPONENT INSPECTION ...........................
.. 112
Intake Sensor Circuit ........................................... .. 113
COMPONENT DESCRIPTION ........................ .. 113
DIAGNOSIS PROCEDURE FOR INTAKE SEN-
SOR ................................................................. .. 113
COMPONENT INSPECTION ........................... .. 114
CONTROLLER ...................................................... ..115
Removal and Installation of A/C and AV Switch .. .. 115
REMOVAL ........................................................ .. 115
INSTALLATION ................................................ .. 115
AUTO AMP ............................................................ ..116
Removal and Installation of Unified Meter and A/C
Amp. .................................................................... .. 116
REMOVAL ........................................................ .. 116
INSTALLATION ................................................ .. 116
AMBIENT SENSOR ............................................... ..117
Removal and Installation ..................................... .. 117
REMOVAL ........................................................ .. 117
INSTALLATION ................................................ .. 117
IN-VEHICLE SENSOR ........................................... ..118
Removal and Installation ..................................... .. 118
REMOVAL ........................................................ .. 118
INSTALLATION ................................................ .. 118
SUNLOAD SENSOR ............................................. ..119
Removal and Installation ..................................... .. 119
REMOVAL ........................................................ .. 119
INSTALLATION ................................................ .. 119
INTAKE SENSOR .................................................. . 120
Removal and Installation ..................................... . 120
REMOVAL ........................................................ . 120
INSTALLATION ................................................ . 120
BLOWER UNIT ...................................................... . 121
Removal and Installation ..................................... . 121
REMOVAL ........................................................ . 121
INSTALLATION ................................................ . 121
Disassembly and Assembly ................................ . 122
BLOWER MOTOR ................................................. . 123
Removal and Installation ..................................... . 123
REMOVAL ........................................................ . 123
INSTALLATION ................................................ . 123
INTAKE DOOR MOTOR ........................................ . 124
Removal and Installation ..................................... . 124
REMOVAL ........................................................ . 124
INSTALLATION ................................................ . 124
IN-CABIN MICROFILTER ...................................... . 125
Removal and Installation ..................................... . 125
FUNCTION ....................................................... . 125
REPLACEMENT TIMING ................................. . 125
REPLACEMENT PROCEDURES .................... . 125
HEATER & COOLING UNIT ASSEMBLY ............. . 126
Removal and Installation ..................................... . 126
REMOVAL ........................................................ . 126
INSTALLATION ................................................ . 127
Disassembly and Assembly ................................ . 129
MODE DOOR MOTOR .......................................... . 131
Removal and Installation ..................................... . 131
REMOVAL ........................................................ . 131
INSTALLATION ................................................ . 131 AIR MIX DOOR MOTOR ........................................
.132
Removal and Installation ..................................... .132
REMOVAL ........................................................ .132
INSTALLATION ................................................ .132
HEATER CORE ...................................................... .133
Removal and Installation ..................................... .133
REMOVAL ........................................................ .133
INSTALLATION ................................................ .133
DUCTS AND GRILLES .......................................... .134
Removal and Installation ..................................... .134
REMOVAL ........................................................ .134
INSTALLATION ................................................ .137
REFRIGERANT LINES .......................................... .138
HFC-134a (R-134a) Service Procedure .............. .138
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ............................................................... .138
Components ........................................................ .140
VQ35DE ........................................................... .140
VK45DE ............................................................ .141
Removal and Installation of Compressor ............. .141
REMOVAL ........................................................ .141
INSTALLATION ................................................ .143
Removal and Installation of Compressor Clutch . .144
REMOVAL ........................................................ .144
INSTALLATION ................................................ .146
Removal and Installation of Low-Pressure Flexible
Hose .................................................................... .148
REMOVAL ........................................................ .148
INSTALLATION ................................................ .149
Removal and Installation of High-Pressure Flexible
Hose .................................................................... .149
REMOVAL ........................................................ .149
INSTALLATION ................................................ .150
Removal and Installation of Low-Pressure Pipe 1
(Engine Compartment) ........................................ .150
REMOVAL ........................................................ .150
INSTALLATION ................................................ .151
Removal and Installation of High-Pressure Pipe 1
and 2 (Engine Compartment) .............................. .151
REMOVAL ........................................................ .151
INSTALLATION ................................................ .152
Removal and Installation of Low-Pressure Pipe 2
and High-Pressure Pipe 3 ................................... .152
REMOVAL ........................................................ .152
INSTALLATION ................................................ .153
Removal and Installation of Liquid Tank .............. .154
REMOVAL ........................................................ .154
INSTALLATION ................................................ .154
Removal and Installation of Condenser ............... .155
REMOVAL ........................................................ .155
INSTALLATION ................................................ .155
Removal and Installation of Refrigerant Pressure
Sensor ................................................................. .156
REMOVAL ........................................................ .156
INSTALLATION ................................................ .156
Removal and Installation of Evaporator ............... .156
REMOVAL ........................................................ .156
INSTALLATION ................................................ .156
Removal and Installation of Expansion Valve ...... .157

PRECAUTIONS ATC-5
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PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
AJS001XF
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:
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.
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.
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 Necessary for Steering Wheel Rotation After Battery DisconnectAJS001XG
NOTE:
This Procedure is applied only to models with Intelligent Key system and NVIS/IVIS (NISSAN/INFINITI
VEHICLE IMMOBILIZER SYSTEM - NATS).
Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″ LOCK ″ position.
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.
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.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.
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.

PRECAUTIONS ATC-7
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CONTAMINATED REFRIGERANT
If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, take appropriate steps
shown below:
Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant
into the atmosphere.
Explain that recovery of the contaminated refrigerant could damage service equipment and refrigerant
supply.
Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
In case of repairing, recover the refrigerant using only dedicated equipment and containers. Never
recover contaminated refrigerant into the existing service equipment. If the facility does not have
dedicated recovery equipment, contact a local refrigerant product retailer for available service. This refrig-
erant must be disposed of in accordance with all federal and local regulations. In addition, replacement of
all refrigerant system components on the vehicle is recommended.
If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact Nissan Cus-
tomer Affairs for further assistance.
General Refrigerant PrecautionsAJS001XJ
WARNING:
Never release refrigerant into the air. Use approved recovery/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.
Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or
air conditioning system.
Never store or heat refrigerant containers above 52 °C (125 °F).
Never heat a refrigerant container with an open flame; if container warming is required, place the
bottom of the container in a warm pail of water.
Never intentionally drop, puncture, or incinerate refrigerant containers.
Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent
suffocation.
Never pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air condition-
ing systems with compressed air during repair. Some mixtures of air and HFC-134a (R-134a) have
been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause injury
or property damage. Additional health and safety information may be obtained from refrigerant
manufacturers.

ATC-12
PRECAUTIONS
Revision: 2005 July 2005 FX
CAUTION:
The new and former refrigerant connections use different O-ring configurations. Never confuse O-
rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or
around, the connection.
O-Ring Part Numbers and Specifications
WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
When the compressor is removed, store it in the same way as it is when mounted on the car. Fail-
ure to do so will cause lubricant to enter the low-pressure chamber.
When connecting tubes, always use a torque wrench and a back-up wrench.
After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
When installing an air conditioner in the vehicle, connect the pipes at the final stage of the opera-
tion. Never remove the seal caps of pipes and other components until just before required for con-
nection.
Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.
Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
Always replace used O-rings.
When connecting tube, apply lubricant to circle of the O-rings shown in illustration. Be careful not
to apply lubricant to threaded portion.
O-ring must be closely attached to dented portion of tube.
When replacing the O-ring, be careful not to damage O-ring and tube.
Connect tube until a click can be heard, then tighten the nut or bolt by hand until snug. Make sure
that the O-ring is installed to tube correctly.
Connection type Piping connection point Part number QTY O-ring size
New Low-pressure pipe 1 to low-pressure pipe 2 (One-touch joint) 92473 N8221 2 16
Low-pressure pipe 2 to expansion valve 92473 N8210 1 16
High-pressure pipe 1 to high-pressure pipe 2 (One-touch joint) 92471 N8221 2 8
High-pressure pipe 3 to expansion valve 92471 N8210 1 8
High-pressure pipe 2 to high-pressure pipe 3 (One-touch joint) 92471 N8221 2 8
Condenser to high-pressure flexible hose (One-touch joint) 92472 N8221 2 12
Condenser to high-pressure pipe 1 (One-touch joint) 92471 N8221 2 8
Low-pressure flexible hose to low-pressure pipe 1 (One-touch joint) 92473 N8221 2 16
Compressor to low-pressure flexible hose 92474 N8210 1 19
Compressor to high-pressure flexible hose 92472 N8210 1 12
Liquid tank to condenser pipe Inlet
92471 N8210 1
8
Outlet 1
Former Refrigerant pressure sensor to condenser J2476 89956 1 10
Expansion valve to evaporator Inlet 92475 71L00 1 12
Outlet 92475 72L00 1 16
Lubricant name : Nissan A/C System Oil Type S
Part number : KLH00-PAGS0