Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Pathfinder 2004-2007 Approved Nissan Pathfinder 2005 ATC
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J AIR CONDITIONER
A
SECTION
AUTOMATIC AIR CONDITIONER
ATC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 5
. LUBRICANT ............................................................. 22
. F
Precautions for Supplemental Restraint System Maintenance of Lubricant Quantity in Compressor 22 ...
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- LUBRICANT ....................................................... 22.
SIONER" ................................................................. 5
. CHECKING AND ADJUSTING ........................... 22 . G
Precautions for Working with HFC-134a (R-134a) 5 ..... AIR CONDITIONER CONTROL .............................. 24 .
Contaminated Refrigerant ....................................... 5 . Description ............................................................. 24
.
General Refrigerant Precautions ............................. 6 . Operation ............................................................... 24
.
H
Precautions for Leak Detection Dye ........................ 6 . AIR MIX DOORS CONTROL ............................. 24 .
A/C Identification Label ........................................... 7
. BLOWER SPEED CONTROL ............................ 24 .
Precautions for Refrigerant Connection .................. 7 . INTAKE DOOR CONTROL ................................ 24 .
FEATURES OF NEW TYPE REFRIGERANT MODE DOOR CONTROL .................................. 24 . I
CONNECTION ..................................................... 7. DEFROSTER DOOR CONTROL ....................... 24 .
O-RING AND REFRIGERANT CONNECTION ..... 8 MAGNET CLUTCH CONTROL .......................... 25 .
Precautions for Servicing Compressor ...................11 . SELF-DIAGNOSTIC SYSTEM ........................... 25 . ATC
Precautions for Service Equipment ........................11 . Description of Control System ............................... 26 .
RECOVERY/RECYCLING EQUIPMENT ............11 . Control Operation .................................................. 26
.
ELECTRONIC LEAK DETECTOR ......................11 . DISPLAY SCREEN (WITH NAVI) ....................... 27 .
K
VACUUM PUMP ................................................ 12 . AUTO SWITCH .................................................. 27 .
MANIFOLD GAUGE SET ................................... 12 . TEMPERATURE CONTROL DIAL (TEMPERA-
SERVICE HOSES .............................................. 12 . TURE CONTROL) (DRIVER SIDE) .................... 27 .
SERVICE COUPLERS ....................................... 13 . TEMPERATURE CONTROL DIAL (TEMPERA- L
REFRIGERANT WEIGHT SCALE ..................... 13 . TURE CONTROL) (PASSENGER SIDE) ........... 27 .
CHARGING CYLINDER ..................................... 13 . TEMPERATURE CONTROL DIAL (TEMPERA-
Wiring Diagrams and Trouble Diagnosis ............... 13 . TURE AND MODE CONTROL) (REAR) ............ 27 . M
PREPARATION ........................................................ 14
. RECIRCULATION () SWITCH ............................ 27 .
Special Service Tools ............................................ 14
. DEFROSTER (DEF) SWITCH ............................ 27 .
HFC-134a (R-134a) Service Tools and Equipment 14 ... REAR WINDOW DEFOGGER SWITCH ............ 27 .
Commercial Service Tools ..................................... 17 . OFF SWITCH ..................................................... 27 .
REFRIGERATION SYSTEM .................................... 18 . A/C SWITCH ...................................................... 27.
Components .......................................................... 18
. MODE SWITCH (FRONT) .................................. 27 .
FRONT REFRIGERATION SYSTEM ................. 18 . FRONT BLOWER CONTROL DIAL ................... 27 .
REAR REFRIGERATION SYSTEM ................... 19 . MODE SWITCH (REAR) .................................... 27 .
Refrigerant Cycle .................................................. 20
. TEMPERATURE CONTROL DIAL (TEMPERA-
REFRIGERANT FLOW ...................................... 20 . TURE AND MODE CONTROL) .......................... 28 .
FREEZE PROTECTION .................................... 20 . REAR BLOWER CONTROL DIAL ..................... 28 .
Refrigerant System Protection .............................. 21 . Discharge Air Flow ................................................ 29.
REFRIGERANT PRESSURE SENSOR ............ 21 . FRONT ............................................................... 29
.
PRESSURE RELIEF VALVE .............................. 21 . REAR ................................................................. 29
.
System Description (Front) .................................... 30 .
SWITCHES AND THEIR CONTROL FUNCTION 30 ...
Revision: November 2005 ATC-1 2005 Pathfinder
System Description (Rear) .................................... 31 . SYSTEM DESCRIPTION ....................................73 .
SWITCHES AND THEIR CONTROL FUNCTION 31 ... COMPONENT DESCRIPTION ...........................74 .
CAN Communication System Description ............. 32 . DIAGNOSTIC PROCEDURE FOR INTAKE
TROUBLE DIAGNOSIS ........................................... 33 . DOOR MOTOR ...................................................74 .
CONSULT-II Function (BCM) ................................. 33 . Front Blower Motor Circuit .....................................75 .
CONSULT-II BASIC OPERATION ...................... 33 . INSPECTION FLOW ...........................................75 .
DATA MONITOR ................................................. 34 . SYSTEM DESCRIPTION ....................................76 .
How to Perform Trouble Diagnosis for Quick and COMPONENT DESCRIPTION ...........................77 .
Accurate Repair ..................................................... 35 . DIAGNOSTIC PROCEDURE FOR BLOWER
WORK FLOW ..................................................... 35 . MOTOR ...............................................................77.
SYMPTOM TABLE ............................................. 35 . COMPONENT INSPECTION ..............................81 .
Component Parts and Harness Connector Location 36 ... Rear Blower Motor Circuit ......................................82 .
ENGINE COMPARTMENT ................................. 36 . INSPECTION FLOW ...........................................82 .
FRONT PASSENGER COMPARTMENT ........... 37 . SYSTEM DESCRIPTION ....................................83 .
REAR PASSENGER COMPARTMENT .............. 38 . DIAGNOSTIC PROCEDURE FOR REAR
Schematic .............................................................. 39 . BLOWER MOTOR ..............................................83 .
Wiring Diagram --A/C,A-- .................................... 40 . COMPONENT INSPECTION ..............................91 .
Front Air Control Terminals and Reference Value... 48 Rear Air Control Circuit ..........................................93 .
PIN CONNECTOR TERMINAL LAYOUT ........... 48 . INSPECTION FLOW ...........................................93 .
TERMINALS AND REFERENCE VALUE FOR SYSTEM DESCRIPTION ....................................94 .
FRONT AIR CONTROL ...................................... 48 . DIAGNOSTIC PROCEDURE FOR REAR AIR
A/C System Self-diagnosis Function (With NAVI)... 50 CONTROL ..........................................................94 .
DESCRIPTION ................................................... 50 . Magnet Clutch Circuit .............................................96 .
Operational Check (Front) ..................................... 52 . INSPECTION FLOW ...........................................96 .
CHECKING MEMORY FUNCTION .................... 52 . SYSTEM DESCRIPTION ....................................97 .
CHECKING BLOWER ........................................ 52 . DIAGNOSTIC PROCEDURE FOR MAGNET
CHECKING DISCHARGE AIR ........................... 53 . CLUTCH .............................................................97 .
CHECKING RECIRCULATION ........................... 53 . Insufficient Cooling ............................................... 102 .
CHECKING TEMPERATURE DECREASE ........ 54 . INSPECTION FLOW ......................................... 102 .
CHECKING TEMPERATURE INCREASE ......... 54 . PERFORMANCE TEST DIAGNOSES ............. 103 .
CHECK A/C SWITCH ......................................... 54 . PERFORMANCE CHART ................................. 105 .
CHECKING AUTO MODE .................................. 54 . TROUBLE DIAGNOSES FOR UNUSUAL PRES-
Operational Check (Rear) ...................................... 55 . SURE ................................................................ 106
.
CHECKING BLOWER ........................................ 55 . Insufficient Heating .............................................. 109 .
CHECKING TEMPERATURE DECREASE ........ 55 . INSPECTION FLOW ......................................... 109 .
CHECKING TEMPERATURE INCREASE ......... 55 . Heater Pump Circuit ............................................. 110 .
Power Supply and Ground Circuit for Front Air Con- SYSTEM DESCRIPTION .................................. 110 .
trol .......................................................................... 56
. DIAGNOSTIC PROCEDURE FOR HEATER
INSPECTION FLOW .......................................... 56 . PUMP CIRCUIT ................................................ 111 .
COMPONENT DESCRIPTION ........................... 57 . COMPONENT INSPECTION ............................ 112 .
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 57 ... Noise .................................................................... 113
.
Mode Door Motor Circuit ....................................... 59 . INSPECTION FLOW ......................................... 113 .
INSPECTION FLOW .......................................... 59 . Self-diagnosis ...................................................... 115.
SYSTEM DESCRIPTION ................................... 60 . INSPECTION FLOW ......................................... 115 .
COMPONENT DESCRIPTION ........................... 61 . Memory Function ................................................. 116 .
DIAGNOSTIC PROCEDURE FOR MODE INSPECTION FLOW ......................................... 116 .
DOOR MOTOR .................................................. 61 . Ambient Sensor 1 Circuit ..................................... 117 .
Air Mix Door Motor Circuit ..................................... 63 . COMPONENT DESCRIPTION ......................... 117 .
INSPECTION FLOW .......................................... 63 . AMBIENT TEMPERATURE INPUT PROCESS . 117
SYSTEM DESCRIPTION ................................... 64 . DIAGNOSTIC PROCEDURE FOR AMBIENT
COMPONENT DESCRIPTION ........................... 65 . SENSOR 1 ........................................................ 117 .
DIAGNOSTIC PROCEDURE FOR AIR MIX COMPONENT INSPECTION ............................ 119 .
DOOR MOTOR (DRIVER) .................................. 65 . In-vehicle Sensor Circuit ...................................... 120 .
DIAGNOSTIC PROCEDURE FOR AIR MIX COMPONENT DESCRIPTION ......................... 120 .
DOOR MOTOR (PASSENGER) ......................... 67 . DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
DIAGNOSTIC PROCEDURE FOR AIR MIX SENSOR ........................................................... 120 .
DOOR MOTOR (REAR) ..................................... 69 . COMPONENT INSPECTION ............................ 122 .
Intake Door Motor Circuit ....................................... 72 . Optical Sensor Circuit .......................................... 123 .
INSPECTION FLOW .......................................... 72 . COMPONENT DESCRIPTION ......................... 123 .
Revision: November 2005 ATC-2 2005 Pathfinder
OPTICAL INPUT PROCESS ........................... 123 . MODE DOOR MOTOR ........................................... 144 .
DIAGNOSTIC PROCEDURE FOR OPTICAL Removal and Installation ..................................... 144 . A
SENSOR .......................................................... 123 . REMOVAL ........................................................ 144 .
Intake Sensor Circuit ........................................... 125 . INSTALLATION ................................................ 144 .
COMPONENT DESCRIPTION ........................ 125 . AIR MIX DOOR MOTOR ........................................ 145 . B
DIAGNOSTIC PROCEDURE FOR INTAKE SEN- Components ........................................................ 145 .
SOR ................................................................. 125
. Removal and Installation ..................................... 145 .
COMPONENT INSPECTION ........................... 126 . FRONT AIR MIX DOOR MOTOR (PASSENGER) 145 .
CONTROL UNIT .................................................... 127 . FRONT AIR MIX DOOR MOTOR (DRIVER) .... 145 . C
Removal and Installation ..................................... 127 . REAR AIR MIX DOOR MOTOR ....................... 145 .
FRONT AIR CONTROL ................................... 127 . VARIABLE BLOWER CONTROL .......................... 147 .
REAR AIR CONTROL ...................................... 127 . Removal and Installation ..................................... 147 . D
AMBIENT SENSOR ............................................... 128 . REMOVAL ........................................................ 147 .
Removal and Installation ..................................... 128 . INSTALLATION ................................................ 147 .
REMOVAL ........................................................ 128 . REAR BLOWER MOTOR RESISTOR ................... 148 . E
INSTALLATION ................................................ 128 . Removal and Installation ..................................... 148 .
IN-VEHICLE SENSOR ........................................... 129 . REMOVAL ........................................................ 148 .
Removal and Installation ..................................... 129 . INSTALLATION ................................................ 148 .
REMOVAL ........................................................ 129 . DUCTS AND GRILLES .......................................... 149 . F
INSTALLATION ................................................ 129 . Components ........................................................ 149 .
OPTICAL SENSOR ............................................... 130 . Removal and Installation ..................................... 151 .
Removal and Installation ..................................... 130 . DEFROSTER NOZZLE .................................... 151 . G
INTAKE SENSOR .................................................. 131 . RH AND LH SIDE DEMISTER DUCT .............. 151 .
Removal and Installation ..................................... 131 . RH AND LH VENTILATOR DUCT .................... 152 .
REMOVAL ........................................................ 131 . CENTER VENTILATOR DUCT ........................ 152 . H
INSTALLATION ................................................ 131 . FLOOR CONNECTOR DUCT .......................... 152 .
BLOWER MOTOR ................................................. 132 . FRONT AND REAR FLOOR DUCTS ............... 152 .
Components ........................................................ 132 . REAR OVERHEAD DUCTS ............................. 152 .
I
Removal and Installation ..................................... 132 . SIDE REAR FLOOR DUCT .............................. 153 .
FRONT BLOWER MOTOR .............................. 132 . GRILLES .......................................................... 153.
REAR BLOWER MOTOR ................................ 133 . REFRIGERANT LINES .......................................... 154 .
IN-CABIN MICROFILTER ...................................... 134 . HFC-134a (R-134a) Service Procedure .............. 154 . ATC
Removal and Installation ..................................... 134 . SETTING OF SERVICE TOOLS AND EQUIP-
FUNCTION ....................................................... 134 . MENT ............................................................... 154
.
REPLACEMENT TIMING ................................. 134 . Components ........................................................ 156 . K
REPLACEMENT PROCEDURE ...................... 134 . Removal and Installation for Compressor ........... 158 .
HEATER & COOLING UNIT ASSEMBLY ............. 136 . REMOVAL ........................................................ 158 .
Components ........................................................ 136 . INSTALLATION ................................................ 158 .
L
Removal and Installation ..................................... 137 . Removal and Installation for Compressor Clutch . 159
FRONT HEATER AND COOLING UNIT ASSEM- REMOVAL ........................................................ 159 .
BLY ................................................................... 137
. INSPECTION ................................................... 160 .
REAR HEATER AND COOLING UNIT ASSEM- INSTALLATION ................................................ 160 . M
BLY ................................................................... 138
. BREAK-IN OPERATION ................................... 162 .
HEATER CORE ..................................................... 140 . Removal and Installation for Front High-pressure
Components ........................................................ 140 . Flexible A/C Hose ................................................ 162 .
Removal and Installation ..................................... 141 . REMOVAL ........................................................ 162 .
FRONT HEATER CORE .................................. 141 . INSTALLATION ................................................ 162 .
REAR HEATER CORE .................................... 141 . Removal and Installation for Front High-pressure
HEATER PUMP ..................................................... 142 . A/C Pipe .............................................................. 162
.
Removal and Installation ..................................... 142 . REMOVAL ........................................................ 162 .
REMOVAL ........................................................ 142 . INSTALLATION ................................................ 162 .
INSTALLATION ................................................ 142 . Removal and Installation for Front Low-pressure
INTAKE DOOR MOTOR ........................................ 143 . Flexible A/C Hose ................................................ 162 .
Removal and Installation ..................................... 143 . REMOVAL ........................................................ 162 .
REMOVAL ........................................................ 143 . INSTALLATION ................................................ 162 .
INSTALLATION ................................................ 143 . Removal and Installation for Front Low-pressure A/
C Pipe .................................................................. 163
.
REMOVAL ........................................................ 163 .
INSTALLATION ................................................ 163 .
Revision: November 2005 ATC-3 2005 Pathfinder
Removal and Installation for Rear High- and Low- Removal and Installation for Front Expansion Valve.169
pressure A/C Pipes .............................................. 163 . REMOVAL ......................................................... 169
.
REMOVAL ........................................................ 163 . INSTALLATION ................................................. 169 .
INSTALLATION ................................................. 163 . Removal and Installation for Rear Expansion Valve.169
Removal and Installation for Underfloor Rear High- REMOVAL ......................................................... 169
.
and Low-pressure A/C and Heater Core Pipes ... 163 . INSTALLATION ................................................. 169 .
REMOVAL ........................................................ 163 . Checking for Refrigerant Leaks ........................... 170 .
INSTALLATION ................................................. 165 . Checking System for Leaks Using the Fluorescent
Removal and Installation for Refrigerant Pressure Dye Leak Detector ............................................... 170.
Sensor ................................................................. 165
. Dye Injection ........................................................ 170
.
REMOVAL ........................................................ 165 . Electronic Refrigerant Leak Detector ................... 171 .
INSTALLATION ................................................. 165 . PRECAUTIONS FOR HANDLING LEAK
Removal and Installation for Condenser .............. 165 . DETECTOR ...................................................... 171.
REMOVAL ........................................................ 165 . CHECKING PROCEDURE ............................... 172 .
INSTALLATION ................................................. 165 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 174 .
Removal and Installation for Front Evaporator .... 166 . Service Data and Specifications (SDS) ............... 174 .
REMOVAL ........................................................ 167 . COMPRESSOR ................................................ 174 .
INSTALLATION ................................................. 167 . LUBRICANT ...................................................... 174
.
Removal and Installation for Rear Evaporator ..... 168 . REFRIGERANT ................................................ 174 .
REMOVAL ........................................................ 168 . ENGINE IDLING SPEED .................................. 174 .
INSTALLATION ................................................. 169 . BELT TENSION ................................................ 174 .
Revision: November 2005 ATC-4 2005 Pathfinder
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS002W4
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front C
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING: D
G To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer. E
G Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. F
G Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
G
Precautions for Working with HFC-134a (R-134a) EJS002W5
WARNING:
G CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants H
are mixed compressor failure is likely to occur. Refer ATC-5, "Contaminated Refrigerant" . To
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use refrigerant recov-
ery/recycling equipment and refrigerant identifier. I
G 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 failure is likely to occur.
G The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol- ATC
lowing handling precautions must be observed:
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