Infiniti F50. Manual - part 119

 

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Infiniti F50. Manual - part 119

 

 

ATC-1

AUTOMATIC AIR CONDITIONER

J  AIR CONDITIONER

CONTENTS

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SECTION 

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ATC

AUTOMATIC AIR CONDITIONER

PRECAUTIONS .......................................................... 4

Precautions for Supplemental Restraint System 
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 4
Precautions for Working with HFC-134a (R-134a) 

..... 4

CONTAMINATED REFRIGERANT  ....................... 5

General Refrigerant Precautions .............................. 5
Lubricant Precautions  .............................................. 5
Precautions for Refrigerant Connection  ................... 6

FEATURES OF NEW TYPE REFRIGERANT 
CONNECTION ...................................................... 6
O-RING AND REFRIGERANT CONNECTION ..... 7

Precautions for Servicing Compressor ..................... 9
Precautions for Service Equipment  .......................... 9

RECOVERY/RECYCLING EQUIPMENT .............. 9
ELECTRONIC LEAK DETECTOR  ........................ 9
VACUUM PUMP  ................................................. 10
MANIFOLD GAUGE SET .................................... 10
SERVICE HOSES  ............................................... 10
SERVICE COUPLERS .........................................11
REFRIGERANT WEIGHT SCALE  .......................11
CALIBRATING ACR4 WEIGHT SCALE ...............11
CHARGING CYLINDER .......................................11

Precautions for Leak Detection Dye ....................... 12

IDENTIFICATION ................................................ 12
IDENTIFICATION LABEL FOR VEHICLE ........... 12

Wiring Diagrams and Trouble Diagnosis ................ 12

PREPARATION ......................................................... 13

Special Service Tools  ............................................. 13
HFC-134a (R-134a) Service Tools and Equipment 

... 13

Commercial Service Tool  ....................................... 16

REFRIGERATION SYSTEM  ..................................... 17

Refrigerant Cycle  ................................................... 17

REFRIGERANT FLOW  ....................................... 17
FREEZE PROTECTION  ..................................... 17

Refrigerant System Protection  ............................... 17

REFRIGERANT PRESSURE SENSOR  ............. 17
PRESSURE RELIEF VALVE ............................... 17

V-6 Variable Displacement Compressor ................. 18

GENERAL INFORMATION  ................................. 18

DESCRIPTION .................................................... 19

Component Layout  ................................................. 22

LUBRICANT .............................................................. 23

Maintenance of Lubricant Quantity in Compressor ... 23

LUBRICANT ........................................................ 23
LUBRICANT RETURN OPERATION  .................. 23
LUBRICANT ADJUSTING PROCEDURE FOR 
COMPONENTS REPLACEMENT EXCEPT 
COMPRESSOR .................................................. 24
LUBRICANT ADJUSTING PROCEDURE FOR 
COMPRESSOR REPLACEMENT ....................... 24

AIR CONDITIONER CONTROL  ............................... 26

Description of Air Conditioner LAN Control System ... 26
System Construction  .............................................. 26

OPERATION ........................................................ 27
TRANSMISSION DATA AND TRANSMISSION 
ORDER ............................................................... 27
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL)  ..................................... 28
FAN SPEED CONTROL ...................................... 28
INTAKE DOOR CONTROL  ................................. 28
OUTLET DOOR CONTROL  ................................ 28
MAGNET CLUTCH CONTROL  ........................... 29
SELF-DIAGNOSTIC SYSTEM  ............................ 29

Description of Control System  ................................ 30
Control Operation  ................................................... 31

DISPLAY SCREEN .............................................. 31
AUTO SWITCH (DRIVER SIDE)  ......................... 31
AUTO SWITCH (PASSENGER SIDE)  ................ 31
TEMPERATURE DIAL (POTENTIO TEMPERA-
TURE CONTROL) (DRIVER SIDE) ..................... 31
TEMPERATURE DIAL (POTENTIO TEMPERA-
TURE CONTROL) (PASSENGER SIDE)  ............ 31
INTAKE SWITCH ................................................. 32
DEFROSTER (DEF) SWITCH ............................. 32
OFF SWITCH  ...................................................... 32
MODE SWITCH (DRIVER SIDE)  ........................ 32
MODE SWITCH (PASSENGER SIDE) ................ 32
ECON (ECONOMY) SWITCH  ............................. 32
FAN SWITCH  ...................................................... 32

ATC-2

DUAL SWITCH  .................................................... 32

FAIL-SAFE FUNCTION  .......................................... 32
Discharge Air Flow  ................................................. 33
System Description ................................................. 34

SWITCHES AND THEIR CONTROL FUNCTION ... 34

TROUBLE DIAGNOSIS  ............................................ 35

How to Perform Trouble Diagnoses for Quick and 
Accurate Repair  ...................................................... 35

WORK FLOW  ...................................................... 35
SYMPTOM TABLE  .............................................. 35

Component Parts and Harness Connector Location ... 36

ENGINE COMPARTMENT  .................................. 36
PASSENGER COMPARTMENT .......................... 37

Schematic ............................................................... 38
Wiring Diagram —A/C— ......................................... 39
Auto Amp. Terminals and Reference Value  ............ 50

PIN CONNECTOR TERMINAL LAYOUT  ............ 50
TERMINALS AND REFERENCE VALUE FOR 
AUTO AMP.  ......................................................... 50

Self-diagnosis Function  .......................................... 53

DESCRIPTION .................................................... 53
FUNCTION CONFIRMATION PROCEDURE ...... 54
AUXILIARY MECHANISM: TEMPERATURE 
SETTING TRIMMER  ........................................... 61

Operational Check  .................................................. 62

CHECKING MEMORY FUNCTION  ..................... 62
CHECKING BLOWER  ......................................... 62
CHECKING DISCHARGE AIR  ............................ 62
CHECKING RECIRCULATION ............................ 63
CHECKING TEMPERATURE DECREASE  ......... 63
CHECKING TEMPERATURE INCREASE  .......... 64
CHECK ECON (ECONOMY) MODE ................... 64
CHECKING AUTO MODE  ................................... 64

Power Supply and Ground Circuit for Auto Amp. ... 65

INSPECTION FLOW  ........................................... 65
COMPONENT DESCRIPTION ............................ 65
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ... 66

LAN System Circuit  ................................................ 67

DIAGNOSTIC PROCEDURE FOR LAN CIR-
CUIT .................................................................... 67

Mode Door Motor Circuit  ........................................ 71

INSPECTION FLOW  ........................................... 71
SYSTEM DESCRIPTION  .................................... 72
COMPONENT DESCRIPTION ............................ 73
DIAGNOSTIC PROCEDURE FOR MODE 
DOOR MOTOR  ................................................... 73

Air Mix Door Motor Circuit  ...................................... 74

INSPECTION FLOW  ........................................... 74
SYSTEM DESCRIPTION  .................................... 75
COMPONENT DESCRIPTION ............................ 76
DIAGNOSTIC PROCEDURE FOR AIR MIX 
DOOR MOTOR  ................................................... 76

Air Mix Door Motor PBR Circuit  .............................. 76

DIAGNOSTIC PROCEDURE FOR AIR MIX 
DOOR MOTOR PBR  ........................................... 76

Intake Door Motor Circuit ........................................ 77

INSPECTION FLOW  ........................................... 77
SYSTEM DESCRIPTION  .................................... 78
COMPONENT DESCRIPTION ............................ 79

DIAGNOSTIC PROCEDURE FOR INTAKE 
DOOR MOTOR ....................................................79

Rear Ventilator Door Motor  .....................................79

COMPONENT DESCRIPTION  ............................79
DIAGNOSTIC PROCEDURE FOR REAR VEN-
TILATOR DOOR MOTOR  ....................................79

Rear control switch  .................................................80

DIAGNOSTIC PROCEDURE FOR REAR CON-
TROL SWITCH  ....................................................80

Blower Motor Circuit ................................................81

INSPECTION FLOW ............................................81
SYSTEM DESCRIPTION .....................................82
COMPONENT DESCRIPTION  ............................83
DIAGNOSTIC PROCEDURE FOR BLOWER 
MOTOR ................................................................83
COMPONENT INSPECTION ...............................85

Magnet Clutch Circuit ..............................................86

INSPECTION FLOW ............................................86
SYSTEM DESCRIPTION .....................................87
DIAGNOSTIC PROCEDURE FOR MAGNET 
CLUTCH ..............................................................87
COMPONENT INSPECTION ...............................91

Insufficient Cooling ..................................................92

INSPECTION FLOW ............................................92
PERFORMANCE TEST DIAGNOSES  ................93
PERFORMANCE CHART ....................................95
TROUBLE DIAGNOSES 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

ECON (ECONOMY) Mode ....................................104

INSPECTION FLOW ..........................................104

No A/C Display is Shown  ......................................105
A/C Operation is not Possible.  ..............................106
Ambient Sensor Circuit  .........................................108

COMPONENT DESCRIPTION  ..........................108
AMBIENT TEMPERATURE INPUT PROCESS .108
DIAGNOSTIC PROCEDURE FOR AMBIENT 
SENSOR ............................................................108
COMPONENT INSPECTION ............................. 110

In-Vehicle Sensor Circuit ....................................... 110

COMPONENT DESCRIPTION  .......................... 110
DIAGNOSTIC PROCEDURE FOR IN-VEHICLE 
SENSOR ............................................................ 111
COMPONENT INSPECTION ............................. 112

Sunload Sensor Circuit  ......................................... 113

COMPONENT DESCRIPTION  .......................... 113
SUNLOAD INPUT PROCESS  ........................... 113
DIAGNOSTIC PROCEDURE FOR SUNLOAD 
SENSOR ............................................................ 113
COMPONENT INSPECTION ............................. 115

ATC-3

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ATC

Intake Sensor Circuit  .............................................116

COMPONENT DESCRIPTION  ..........................116
DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
SOR ...................................................................116
COMPONENT INSPECTION .............................117

Multiplex Communication Circuit  ...........................118

DIAGNOSTIC PROCEDURE FOR MULTIPLEX 
COMMUNICATION CIRCUIT (FRONT CON-
TROLLER) .........................................................118
DIAGNOSTIC PROCEDURE FOR MULTIPLEX 
COMMUNICATION CIRCUIT (REAR CONTROL 
SWITCH) ........................................................... 121

CONTROL UNIT  ..................................................... 123

Removal and Installation  ...................................... 123

REMOVAL ......................................................... 123
INSTALLATION ................................................. 123

AMBIENT SENSOR ................................................ 124

Removal and Installation  ...................................... 124

REMOVAL ......................................................... 124
INSTALLATION ................................................. 124

IN-VEHICLE SENSOR ............................................ 125

Removal and Installation  ...................................... 125

REMOVAL ......................................................... 125
INSTALLATION ................................................. 125

SUNLOAD SENSOR  .............................................. 126

Removal and Installation  ...................................... 126

REMOVAL ......................................................... 126
INSTALLATION ................................................. 126

INTAKE SENSOR  ................................................... 127

Removal and Installation  ...................................... 127

REMOVAL ......................................................... 127
INSTALLATION ................................................. 127

BLOWER UNIT  ....................................................... 128

Removal and Installation  ...................................... 128

REMOVAL ......................................................... 128
INSTALLATION ................................................. 128

Disassembly and Assembly  ................................. 129

BLOWER MOTOR  .................................................. 130

Removal and Installation  ...................................... 130

REMOVAL ......................................................... 130
INSTALLATION ................................................. 130

INTAKE DOOR MOTOR  ......................................... 131

Removal and Installation  ...................................... 131

REMOVAL ......................................................... 131
INSTALLATION ................................................. 131

IN-CABIN MICROFILTER ....................................... 132

Removal and Installation  ...................................... 132

FUNCTION ........................................................ 132
REPLACEMENT TIMING .................................. 132
REPLACEMENT PROCEDURES ..................... 132

HEATER & COOLING UNIT ASSEMBLY  .............. 133

Removal and Installation  ...................................... 133

REMOVAL ......................................................... 133
INSTALLATION ................................................. 134

Disassembly and Assembly  ................................. 135

MODE DOOR MOTOR  ........................................... 136

Removal and Installation  ...................................... 136

REMOVAL ......................................................... 136
INSTALLATION ................................................. 136

AIR MIX DOOR MOTOR  ......................................... 137

Removal and Installation  ...................................... 137

REMOVAL ......................................................... 137
INSTALLATION ................................................. 137

DUCTS AND GRILLES ........................................... 138

Removal and Installation  ...................................... 138

REMOVAL ......................................................... 138
INSTALLATION ................................................. 140

REFRIGERANT LINES  ........................................... 141

HFC-134a (R-134a) Service Procedure  ............... 141

SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................ 141

Components ......................................................... 143
Compressor .......................................................... 144

REMOVAL ......................................................... 144
INSTALLATION ................................................. 144

Compressor Clutch ............................................... 145

REMOVAL ......................................................... 145
INSTALLATION ................................................. 147

Low-Pressure Flexible Hose ................................. 148

REMOVAL ......................................................... 148
INSTALLATION ................................................. 148

High-Pressure Flexible Hose ................................ 149

REMOVAL ......................................................... 149
INSTALLATION ................................................. 149

High-Pressure Pipe  .............................................. 149

REMOVAL ......................................................... 149
INSTALLATION ................................................. 150

Refrigerant Pressure Sensor  ................................ 150

REMOVAL ......................................................... 150
INSTALLATION ................................................. 150

Condenser ............................................................ 151

REMOVAL ......................................................... 151
INSTALLATION ................................................. 152

Liquid Tank  ........................................................... 152

REMOVAL ......................................................... 153
INSTALLATION ................................................. 153

Evaporator ............................................................ 153

REMOVAL ......................................................... 153
INSTALLATION ................................................. 154

Expansion Valve  ................................................... 154

REMOVAL ......................................................... 154
INSTALLATION ................................................. 154

Checking for Refrigerant Leaks  ............................ 155
Checking System for Leaks Using the Fluorescent 
Leak Detector  ....................................................... 155
Dye Injection ......................................................... 155
Electronic Refrigerant Leak Detector .................... 156

PRECAUTIONS FOR HANDLING LEAK 
DETECTOR ....................................................... 156
CHECKING PROCEDURE  ............................... 157

SERVICE DATA AND SPECIFICATIONS (SDS)  .... 159

Compressor .......................................................... 159
Lubricant ............................................................... 159
Refrigerant ............................................................ 159
Engine Idling Speed  ............................................. 159
Belt Tension  .......................................................... 159

ATC-4

PRECAUTIONS

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT 
BELT PRE-TENSIONER”

EJS0022V

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 for Working with HFC-134a (R-134a)

EJS0008R

WARNING:

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.

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.

The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
lowing handling precautions must be observed:

When removing refrigerant components from a vehicle, immediately cap (seal) the component to
minimize the entry of moisture from the atmosphere.

When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possi-
ble to minimize the entry of moisture into system.

Only use the specified lubricant from a sealed container. Immediately reseal containers of lubri-
cant. Without proper sealing, lubricant will become moisture saturated and should not be used.

Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from the A/C system, using certified service equipment meet-
ing requirements of SAE J2210 HFC-134a (R-134a) recycling equipment, or J2209 HFC-134a (R-
134a) recovery equipment. If accidental system discharge occurs, ventilate work area before
resuming service. Additional health and safety information may be obtained from refrigerant and
lubricant manufacturers.

Do not allow lubricant (Nissan A/C System Oil Type S) to come in contact with styrofoam parts.
Damage may result.

 

 

 

 

 

 

 

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