2004 INFINITI FX35 air intake

ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
C
D
E
F
G
H
I
K
L
M
SECTION AT C
A
B
AT C
Revision: 2004 November 2004 FX35/FX45
AUTOMATIC AIR CONDITIONER
PRECAUTIONS .......................................................... 5
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 5
Precautions for Working with HFC-134a (R-134a) ..... 5
CONTAMINATED REFRIGERANT ....................... 5
General Refrigerant Precautions .............................. 7
Lubricant 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
Wiring Diagrams and Trouble Diagnosis ................ 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 ................................. 22DESCRIPTION .................................................... 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-DIAGNOSTIC SYSTEM ............................ 33
Description of Control System ................................ 34
Control Operation ................................................... 34
DISPLAY SCREEN .............................................. 35
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
MODE SWITCH .................................................. 35
FAN SWITCH ...................................................... 35

ATC-2Revision: 2004 November 2004 FX35/FX45DUAL 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 ............................................................ 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 RECIRCULATION ............................ 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
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ... 64
LAN System Circuit ................................................ 66
DIAGNOSTIC PROCEDURE FOR LAN CIR-
CUIT .................................................................... 66
Mode Door Motor Circuit ........................................ 70
INSPECTION FLOW ........................................... 70
SYSTEM DESCRIPTION .................................... 71
COMPONENT DESCRIPTION ............................ 72
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR ................................................... 72
Air Mix Door Motor Circuit ...................................... 73
INSPECTION FLOW ........................................... 73SYSTEM DESCRIPTION ..................................... 74
COMPONENT DESCRIPTION ............................ 75
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR .................................................................. 75
Air Mix Door Motor PBR Circuit .............................. 75
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR PBR .......................................................... 75
Intake Door Motor Circuit ........................................ 76
INSPECTION FLOW ............................................ 76
SYSTEM DESCRIPTION ..................................... 77
COMPONENT DESCRIPTION ............................ 78
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR .................................................... 78
Blower Motor Circuit ................................................ 79
INSPECTION FLOW ............................................ 79
SYSTEM DESCRIPTION ..................................... 80
COMPONENT DESCRIPTION ............................ 81
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ................................................................ 81
COMPONENT INSPECTION ............................... 83
Magnet Clutch Circuit .............................................. 84
INSPECTION FLOW ............................................ 84
SYSTEM DESCRIPTION ..................................... 85
DIAGNOSTIC 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
DIAGNOSTIC 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
DIAGNOSTIC PROCEDURE FOR AMBIENT
SENSOR ............................................................104
COMPONENT INSPECTION .............................106
In-vehicle Sensor Circuit .......................................107
COMPONENT DESCRIPTION ..........................107
DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
SENSOR ............................................................108
COMPONENT INSPECTION .............................109
Sunload Sensor Circuit .........................................110
COMPONENT DESCRIPTION ..........................110
SUNLOAD INPUT PROCESS ...........................110
DIAGNOSTIC PROCEDURE FOR SUNLOAD
SENSOR ............................................................110

ATC-3
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2004 November 2004 FX35/FX45COMPONENT INSPECTION ............................. 112
Intake Sensor Circuit ............................................. 113
COMPONENT DESCRIPTION .......................... 113
DIAGNOSTIC 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 ................................. 128
MODE DOOR MOTOR ........................................... 130
Removal and Installation ...................................... 130
REMOVAL ......................................................... 130
INSTALLATION ................................................. 130AIR MIX DOOR MOTOR .........................................131
Removal and Installation ......................................131
REMOVAL .........................................................131
INSTALLATION .................................................131
HEATER CORE .......................................................132
Removal and Installation ......................................132
REMOVAL .........................................................132
INSTALLATION .................................................132
DUCTS AND GRILLES ...........................................133
Removal and Installation ......................................133
REMOVAL .........................................................133
INSTALLATION .................................................136
REFRIGERANT LINES ...........................................137
HFC-134a (R-134a) Service Procedure ...............137
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................137
Components .........................................................139
VK45DE .............................................................139
VQ35DE ............................................................140
Removal and Installation of Compressor ..............140
REMOVAL .........................................................140
INSTALLATION .................................................142
Removal and Installation of Compressor Clutch ..143
REMOVAL .........................................................143
INSTALLATION .................................................145
Removal and Installation of Low-pressure Flexible
Hose .....................................................................147
REMOVAL .........................................................147
INSTALLATION .................................................148
Removal and Installation of High-pressure Flexible
Hose .....................................................................148
REMOVAL .........................................................148
INSTALLATION .................................................149
Removal and Installation of Low-pressure Pipe 1
(Engine Compartment) .........................................149
REMOVAL .........................................................149
INSTALLATION .................................................150
Removal and Installation of High-pressure Pipe 1
and 2 (Engine Compartment) ...............................150
REMOVAL .........................................................150
INSTALLATION .................................................151
Removal and Installation of Low-pressure Pipe 2
and High-pressure Pipe 3 .....................................151
REMOVAL .........................................................151
INSTALLATION .................................................152
Removal and Installation of Liquid Tank ...............153
REMOVAL .........................................................153
INSTALLATION .................................................153
Removal and Installation of Condenser ................154
REMOVAL .........................................................154
INSTALLATION .................................................154
Removal and Installation of Refrigerant Pressure
Sensor ..................................................................155
REMOVAL .........................................................155
INSTALLATION .................................................155
Removal and Installation of Evaporator ................155
REMOVAL .........................................................155
INSTALLATION .................................................155
Removal and Installation of Expansion Valve .......156

ATC-22
REFRIGERATION SYSTEM
Revision: 2004 November 2004 FX35/FX45
V-6 Variable Displacement CompressorAJS001BE
GENERAL INFORMATION
1. The V-6 variable compressor differs from previous units. The vent temperatures of the V-6 variable com-
pressor do not drop too far below 5°C (41°F) when:
Evaporator intake air temperature is less than 20°C (68°F).
Engine is running at speeds less than 1,500 rpm.
This is because the V-6 compressor provides a means of “capacity” control.
2. The V-6 variable compressor provides refrigerant control under varying conditions. During cold winters, it
may not produce high refrigerant pressure discharge (compared to previous units) when used with air
conditioning systems.
3. A “clanking” sound may occasionally be heard during refrigerant charge. The sound indicates that the tilt
angle of the wobble (swash) plate has changed and is not a malfunction.
4. For air conditioning systems with the V-6 compressor, the clutch remains engaged unless: the system
main switch, fan switch or ignition switch is turned OFF. When ambient (outside) temperatures are low or
when the amount of refrigerant is insufficient, the clutch is disengaged to protect the compressor.

LUBRICANT
ATC-27
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2004 November 2004 FX35/FX45
LUBRICANTPFP:KLG00
Maintenance of Lubricant Quantity in CompressorAJS00149
The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
sor when replacing any component or after a large refrigerant leakage occurred. It is important to maintain the
specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:

Lack of lubricant: May lead to a seized compressor

Excessive lubricant: Inadequate cooling (thermal exchange interference)
LUBRICANT
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
1. CHECK LUBRICANT RETURN OPERATION
Can lubricant return operation be performed?

A/C system works properly.

There is no evidence of a large amount of lubricant leakage.
CAUTION:
If excessive lubricant leakage is noted, do not perform the lubricant return operation.
YES or NO
YES >> GO TO 2.
NO >> GO TO 3.
2. PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS:
1. Start engine, and set the following conditions:
–Test condition
Engine speed: Idling to 1,200 rpm
A/C switch: ON
Blower speed: Max. position
Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).]
Intake position: Recirculation (REC)
2. Perform lubricant return operation for about 10 minutes.
3. Stop engine.
>> GO TO 3.
3. CHECK REPLACEMENT PART
Should the compressor be replaced?
YES >> GO TO AT C - 2 9 , "LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACE-
MENT" .
NO >> GO TO AT C - 2 8 , "
LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACE-
MENT EXCEPT COMPRESSOR" . Name : NISSAN A/C System Oil Type S
Part number : KLH00-PAGS0

ATC-30
AIR CONDITIONER CONTROL
Revision: 2004 November 2004 FX35/FX45
AIR CONDITIONER CONTROLPFP:27500
Description of Air Conditioner LAN Control SystemAJS0014A
The LAN (Local Area Network) system consists of unified meter and A/C amp., mode door motor, air mix door
motor and intake door motor.
A configuration of these components is shown in the diagram below.
System ConstructionAJS0014B
A small network is constructed between the unified meter and A/C amp., air mix door motor, mode door motor
and intake door motor. The unified meter and A/C amp. and motors are connected by data transmission lines
and motor power supply lines. The LAN network is built through the ground circuits of the each door motor.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the unified meter and A/C amp. and each door motor.
The following functions are contained in LCUs built into the air mix door motor, mode door motor and intake
door motor.

Address

Motor opening angle signals

Data transmission

Motor stop and drive decision

Opening angle sensor (PBR function)

Comparison

Decision (Unified meter and A/C amp. indicated value and motor opening angle comparison)
OPERATION
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door
motor LCU and intake door motor LCU.
The mode door motor, air mix door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors are compared by the LCUs in each motor with the existing decision and opening
angles. Subsequently, HOT/COLD, DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The
new selection data is returned to the unified meter and A/C amp.
SJIA0262E
RJIA1747E

AIR CONDITIONER CONTROL
ATC-31
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2004 November 2004 FX35/FX45
TRANSMISSION DATA AND TRANSMISSION ORDER
Unified meter and A/C amp. data is transmitted consecutively to each of the door motors following the form
shown in figure below.
Start:
Initial compulsory signal sent to each of the door motors.
Address:
Data sent from the unified meter and A/C amp. is selected according to data-based decisions made by the air
mix door motor, mode door motor and intake door motor.
If the addresses are identical, the opening angle data and error check signals are received by the door motor
LCUs. The LCUs then make the appropriate error decision. If the opening angle data is usual, door control
begins.
If an error exists, the received data is rejected and corrected data received. Finally, door control is based upon
the corrected opening angle data.
Opening Angle:
Data that shows the indicated door opening angle of each door motor.
Error Check:
Procedure by which sent and received data is checked for errors. Error data is then compiled. The error check
prevents corrupted data from being used by the air mix door motor, mode door motor and intake door motor.
Error data can be related to the following symptoms.

Unusual electrical frequency

Poor electrical connections

Signal leakage from transmission lines

Signal level fluctuation
RJIA1748E

ATC-32
AIR CONDITIONER CONTROL
Revision: 2004 November 2004 FX35/FX45
Stop Signal:
At the end of each transmission, a stop operation, in-operation, or internal error message is delivered to the
unified meter and A/C amp. This completes one data transmission and control cycle.
AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)
The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
FAN SPEED CONTROL
Blower speed is automatically controlled by temperature setting, ambient temperature, in-vehicle temperature,
intake temperature, amount of sunload and air mix door position.
When pressing AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOOR CONTROL
The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON-OFF operation of the compressor.
OUTLET DOOR CONTROL
The outlet door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
RJIA1749E