Infiniti M45 (Y34). Manual - part 129

 

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Infiniti M45 (Y34). Manual - part 129

 

 

ATC-1

AUTOMATIC AIR CONDITIONER

J  AIR CONDITIONER

CONTENTS

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SECTION 

ATC

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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  ....................... 4

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

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

Precautions for Servicing Compressor ..................... 8
Precautions for Service Equipment  .......................... 9

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

Precautions for Leak Detection Dye ........................11

IDENTIFICATION .................................................11
IDENTIFICATION LABEL FOR VEHICLE ............11

Wiring Diagrams and Trouble Diagnosis .................11

PREPARATION ......................................................... 12

Special Service Tools  ............................................. 12
HFC-134a (R-134a) Service Tools and Equipment 

... 12

Commercial Service Tools ...................................... 15

REFRIGERATION SYSTEM  ..................................... 16

Refrigerant Cycle  ................................................... 16

REFRIGERANT FLOW  ....................................... 16
FREEZE PROTECTION  ..................................... 16

Refrigerant System Protection  ............................... 16

REFRIGERANT PRESSURE SENSOR  ............. 16
PRESSURE RELIEF VALVE ............................... 16

V-6 Variable Displacement Compressor ................. 17

GENERAL INFORMATION  ................................. 17

DESCRIPTION .................................................... 18

Component Layout  ................................................. 21

LUBRICANT .............................................................. 22

Maintenance of Lubricant Quantity in Compressor ... 22

LUBRICANT ........................................................ 22
LUBRICANT RETURN OPERATION  .................. 22
LUBRICANT ADJUSTING PROCEDURE FOR 
COMPONENTS REPLACEMENT EXCEPT 
COMPRESSOR .................................................. 23
LUBRICANT ADJUSTING PROCEDURE FOR 
COMPRESSOR REPLACEMENT ....................... 23

AIR CONDITIONER CONTROL  ............................... 25

Description of Air Conditioner LAN Control System ... 25
System Construction  .............................................. 25

OPERATION ........................................................ 26
TRANSMISSION DATA AND TRANSMISSION 
ORDER ............................................................... 26
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL)  ..................................... 27
FAN SPEED CONTROL ...................................... 27
INTAKE DOOR CONTROL  ................................. 27
OUTLET DOOR CONTROL  ................................ 27
MAGNET CLUTCH CONTROL  ........................... 28
SELF-DIAGNOSTIC SYSTEM  ............................ 28

Description of Control System  ................................ 29
Control Operation  ................................................... 30

DISPLAY SCREEN .............................................. 30
AUTO SWITCH (DRIVER SIDE)  ......................... 30
AUTO SWITCH (PASSENGER SIDE)  ................ 30
TEMPERATURE DIAL (POTENTIO TEMPERA-
TURE CONTROL) (DRIVER SIDE) ..................... 30
TEMPERATURE DIAL (POTENTIO TEMPERA-
TURE CONTROL) (PASSENGER SIDE)  ............ 30
INTAKE SWITCH ................................................. 31
DEFROSTER (DEF) SWITCH ............................. 31
OFF SWITCH  ...................................................... 31
MODE SWITCH (DRIVER SIDE)  ........................ 31
MODE SWITCH (PASSENGER SIDE) ................ 31
ECON (ECONOMY) SWITCH  ............................. 31
FAN SWITCH  ...................................................... 31

ATC-2

DUAL SWITCH  .................................................... 31

Fail-Safe Function  .................................................. 31
Discharge Air Flow  ................................................. 32
System Description ................................................. 33

SWITCHES AND THEIR CONTROL FUNCTION ... 33

TROUBLE DIAGNOSIS  ............................................ 34

How to Perform Trouble Diagnosis for Quick and 
Accurate Repair  ...................................................... 34

WORK FLOW  ...................................................... 34
SYMPTOM TABLE  .............................................. 34

Component Parts and Harness Connector Location ... 35

ENGINE COMPARTMENT  .................................. 35
PASSENGER COMPARTMENT .......................... 36

Schematic ............................................................... 37
Wiring Diagram —A/C— ......................................... 38
Auto Amp. Terminals and Reference Value  ............ 47

PIN CONNECTOR TERMINAL LAYOUT  ............ 47
TERMINALS AND REFERENCE VALUE FOR 
AUTO AMP.  ......................................................... 47

Self-Diagnosis Function .......................................... 49

DESCRIPTION .................................................... 49
FUNCTION CONFIRMATION PROCEDURE ...... 50
AUXILIARY MECHANISM: TEMPERATURE 
SETTING TRIMMER  ........................................... 56

Operational Check  .................................................. 57

CHECKING MEMORY FUNCTION  ..................... 57
CHECKING BLOWER  ......................................... 57
CHECKING DISCHARGE AIR  ............................ 57
CHECKING RECIRCULATION ............................ 58
CHECKING TEMPERATURE DECREASE  ......... 58
CHECKING TEMPERATURE INCREASE  .......... 59
CHECK ECON (ECONOMY) MODE ................... 59
CHECKING AUTO MODE  ................................... 59

Power Supply and Ground Circuit for Auto Amp. ... 60

INSPECTION FLOW  ........................................... 60
COMPONENT DESCRIPTION ............................ 60
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ... 61

LAN System Circuit  ................................................ 62

DIAGNOSTIC PROCEDURE FOR LAN CIR-
CUIT .................................................................... 62

Mode Door Motor Circuit  ........................................ 66

INSPECTION FLOW  ........................................... 66
SYSTEM DESCRIPTION  .................................... 67
COMPONENT DESCRIPTION ............................ 68
DIAGNOSTIC PROCEDURE FOR MODE 
DOOR MOTOR  ................................................... 68

Air Mix Door Motor Circuit  ...................................... 69

INSPECTION FLOW  ........................................... 69
SYSTEM DESCRIPTION  .................................... 70
COMPONENT DESCRIPTION ............................ 71
DIAGNOSTIC PROCEDURE FOR AIR MIX 
DOOR MOTOR  ................................................... 71

Air Mix Door Motor PBR Circuit  .............................. 71

DIAGNOSTIC PROCEDURE FOR AIR MIX 
DOOR MOTOR PBR  ........................................... 71

Intake Door Motor Circuit ........................................ 72

INSPECTION FLOW  ........................................... 72
SYSTEM DESCRIPTION  .................................... 73
COMPONENT DESCRIPTION ............................ 74

DIAGNOSTIC PROCEDURE FOR INTAKE 
DOOR MOTOR ....................................................74

Blower Motor Circuit ................................................75

INSPECTION FLOW ............................................75
SYSTEM DESCRIPTION .....................................76
COMPONENT DESCRIPTION  ............................77
DIAGNOSTIC PROCEDURE FOR BLOWER 
MOTOR ................................................................77
COMPONENT INSPECTION ...............................79

Magnet Clutch Circuit ..............................................80

INSPECTION FLOW ............................................80
SYSTEM DESCRIPTION .....................................81
DIAGNOSTIC PROCEDURE FOR MAGNET 
CLUTCH ..............................................................81
COMPONENT INSPECTION ...............................86

Insufficient Cooling ..................................................87

INSPECTION FLOW ............................................87
PERFORMANCE TEST DIAGNOSIS ..................89
PERFORMANCE CHART ....................................91
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE ...................................................................92
DIAGNOSTIC PROCEDURE FOR INSUFFI-
CIENT COOLING .................................................94

Insufficient Heating  .................................................96

INSPECTION FLOW ............................................96

Noise .......................................................................97

INSPECTION FLOW ............................................97

Self-Diagnosis .........................................................98

INSPECTION FLOW ............................................98

Memory Function  ....................................................99

INSPECTION FLOW ............................................99

ECON (ECONOMY) Mode ....................................100

INSPECTION FLOW ..........................................100

Ambient Sensor Circuit  .........................................101

COMPONENT DESCRIPTION  ..........................101
AMBIENT TEMPERATURE INPUT PROCESS .101
DIAGNOSTIC PROCEDURE FOR AMBIENT 
SENSOR ............................................................101
COMPONENT INSPECTION .............................103

In-Vehicle Sensor Circuit .......................................103

COMPONENT DESCRIPTION  ..........................103
DIAGNOSTIC PROCEDURE FOR IN-VEHICLE 
SENSOR ............................................................104
COMPONENT INSPECTION .............................105

Sunload Sensor Circuit  .........................................106

COMPONENT DESCRIPTION  ..........................106
SUNLOAD INPUT PROCESS  ...........................106
DIAGNOSTIC PROCEDURE FOR SUNLOAD 
SENSOR ............................................................106
COMPONENT INSPECTION .............................108

Intake Sensor Circuit .............................................109

COMPONENT DESCRIPTION  ..........................109
DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
SOR ...................................................................109
COMPONENT INSPECTION ............................. 110

Multiplex Communication Circuit ........................... 111

DIAGNOSTIC PROCEDURE FOR MULTIPLEX 
COMMUNICATION CIRCUIT  ............................ 111

ATC-3

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CONTROL UNIT  ......................................................114

Removal and Installation  .......................................114

REMOVAL ..........................................................114
INSTALLATION ..................................................114

AMBIENT SENSOR .................................................115

Removal and Installation  .......................................115

REMOVAL ..........................................................115
INSTALLATION ..................................................115

IN-VEHICLE SENSOR .............................................116

Removal and Installation  .......................................116

REMOVAL ..........................................................116
INSTALLATION ..................................................116

SUNLOAD SENSOR  ...............................................117

Removal and Installation  .......................................117

REMOVAL ..........................................................117
INSTALLATION ..................................................117

INTAKE SENSOR  ....................................................118

Removal and Installation  .......................................118

REMOVAL ..........................................................118
INSTALLATION ..................................................118

BLOWER UNIT  ........................................................119

Removal and Installation  .......................................119

REMOVAL ..........................................................119
INSTALLATION ..................................................119

Disassembly and Assembly  ..................................119

BLOWER MOTOR  .................................................. 121

Removal and Installation  ...................................... 121

REMOVAL ......................................................... 121
INSTALLATION ................................................. 121

INTAKE DOOR MOTOR  ......................................... 122

Removal and Installation  ...................................... 122

REMOVAL ......................................................... 122
INSTALLATION ................................................. 122

IN-CABIN MICROFILTER ....................................... 123

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

FUNCTION ........................................................ 123
REPLACEMENT TIMING .................................. 123
REPLACEMENT PROCEDURES ..................... 123

HEATER & COOLING UNIT ASSEMBLY  .............. 124

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

REMOVAL ......................................................... 124
INSTALLATION ................................................. 125

Disassembly and Assembly  ................................. 126

HEATER CORE  ...................................................... 128

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

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

MODE DOOR MOTOR  ........................................... 129

Removal and Installation  ...................................... 129

REMOVAL ......................................................... 129
INSTALLATION ................................................. 129

AIR MIX DOOR MOTOR ......................................... 130

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

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

DUCTS AND GRILLES ........................................... 131

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

REMOVAL ......................................................... 131
INSTALLATION ................................................. 133

REFRIGERANT LINES  ........................................... 134

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

SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................ 134

Components ......................................................... 136
Removal and Installation of Compressor .............. 137

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

Removal and Installation of Compressor Clutch  .. 138

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

Removal and Installation of Low-Pressure Flexible 
Hose ..................................................................... 141

REMOVAL ......................................................... 141
INSTALLATION ................................................. 142

Removal and Installation of High-Pressure Flexible 
Hose ..................................................................... 142

REMOVAL ......................................................... 142
INSTALLATION ................................................. 142

Removal and Installation of High-Pressure Pipe  .. 143

REMOVAL ......................................................... 143
INSTALLATION ................................................. 143

Removal and Installation of Refrigerant Pressure 
Sensor .................................................................. 143

REMOVAL ......................................................... 143
INSTALLATION ................................................. 143

Removal and installation of Condenser ................ 144

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

Removal and Installation of Liquid Tank  ............... 145

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

Removal and Installation of Evaporator ................ 146

REMOVAL ......................................................... 146
INSTALLATION ................................................. 146

Removal and Installation of Expansion Valve ....... 146

REMOVAL ......................................................... 146
INSTALLATION ................................................. 147

Checking for Refrigerant Leaks  ............................ 147
Checking System for Leaks Using the Fluorescent 
Leak Detector  ....................................................... 148
Dye Injection ......................................................... 148
Electronic Refrigerant Leak Detector .................... 148

PRECAUTIONS FOR HANDLING LEAK 
DETECTOR ....................................................... 148
CHECKING PROCEDURE  ............................... 149

SERVICE DATA AND SPECIFICATIONS (SDS)  .... 151

Compressor .......................................................... 151
Lubricant ............................................................... 151
Refrigerant ............................................................ 151
Engine Idling Speed  ............................................. 151
Belt Tension  .......................................................... 151

ATC-4

PRECAUTIONS

PRECAUTIONS

PFP:00001

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

AJS00115

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.

WARNING:

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)

AJS0006S

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 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 J-2210 HFC-134a (R-134a) recycling equipment, or J-2209 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.

CONTAMINATED REFRIGERANT

If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:

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 your service equipment and refriger-
ant supply.

Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.

 

 

 

 

 

 

 

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