Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Pathfinder 2004-2007 Approved Nissan Pathfinder 2007 ATC
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J AIR CONDITIONER
A
SECTION
AUTOMATIC AIR CONDITIONER
ATC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 5
. OIL ............................................................................ 22
. F
Precautions for Supplemental Restraint System Maintenance of Oil Quantity in Compressor .......... 22 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- OIL ...................................................................... 22
.
SIONER" ................................................................. 5
. CHECKING AND ADJUSTING ........................... 22 . G
Precautions for Working with HFC-134a (R-134a) 5 ..... AIR CONDITIONER CONTROL .............................. 25 .
Contaminated Refrigerant ....................................... 5 . Description ............................................................. 25.
General Refrigerant Precautions ............................. 6 . Operation ............................................................... 25.
H
Precautions for Leak Detection Dye ........................ 6 . AIR MIX DOORS CONTROL ............................. 25 .
A/C Identification Label ........................................... 6
. BLOWER SPEED CONTROL ............................ 25 .
Precautions for Refrigerant Connection .................. 6 . INTAKE DOOR CONTROL ................................ 25 .
FEATURES OF NEW TYPE REFRIGERANT MODE DOOR CONTROL .................................. 25 . I
CONNECTION ..................................................... 7. DEFROSTER DOOR CONTROL ....................... 25 .
O-RING AND REFRIGERANT CONNECTION ..... 8 MAGNET CLUTCH CONTROL .......................... 26 .
Precautions for Servicing Compressor ...................11 . SELF-DIAGNOSTIC SYSTEM ........................... 26 . ATC
Precautions for Service Equipment ........................11 . Description of Control System ............................... 27 .
RECOVERY/RECYCLING EQUIPMENT ............11 . Control Operation .................................................. 27 .
ELECTRONIC LEAK DETECTOR ......................11 . DISPLAY SCREEN ............................................. 28 .
K
VACUUM PUMP ................................................ 12 . AUTO SWITCH .................................................. 28 .
MANIFOLD GAUGE SET ................................... 12 . TEMPERATURE CONTROL DIAL (TEMPERA-
SERVICE HOSES .............................................. 12 . TURE CONTROL) (DRIVER SIDE) .................... 28 .
SERVICE COUPLERS ....................................... 13 . TEMPERATURE CONTROL DIAL (TEMPERA- L
REFRIGERANT WEIGHT SCALE ..................... 13 . TURE CONTROL) (PASSENGER SIDE) ........... 28 .
CHARGING CYLINDER ..................................... 13 . TEMPERATURE CONTROL DIAL (TEMPERA-
PREPARATION ........................................................ 14
. TURE AND MODE CONTROL) (REAR) ............ 28 . M
Special Service Tools ............................................ 14
. RECIRCULATION () SWITCH ............................ 28 .
HFC-134a (R-134a) Service Tools and Equipment 14 ... DEFROSTER () SWITCH ................................... 28 .
Commercial Service Tools ..................................... 17 . REAR WINDOW DEFOGGER SWITCH ............ 28 .
REFRIGERATION SYSTEM .................................... 18 . OFF SWITCH ..................................................... 28 .
Components .......................................................... 18
. A/C SWITCH ...................................................... 28 .
FRONT REFRIGERATION SYSTEM ................. 18 . MODE SWITCH (FRONT) .................................. 28 .
REAR REFRIGERATION SYSTEM ................... 19 . FRONT BLOWER CONTROL DIAL ................... 28 .
Refrigerant Cycle .................................................. 20
. MODE SWITCH (REAR) .................................... 28 .
REFRIGERANT FLOW ...................................... 20 . TEMPERATURE CONTROL DIAL (TEMPERA-
FREEZE PROTECTION .................................... 20 . TURE AND MODE CONTROL) .......................... 29 .
Refrigerant System Protection .............................. 21 . REAR BLOWER CONTROL DIAL ..................... 29 .
REFRIGERANT PRESSURE SENSOR ............ 21 . Discharge Air Flow ................................................ 30 .
PRESSURE RELIEF VALVE .............................. 21 . FRONT ............................................................... 30 .
REAR ................................................................. 30 .
System Description (Front) .................................... 31 .
SWITCHES AND THEIR CONTROL FUNCTION 31 ...
Revision: September 2006 ATC-1 2007 Pathfinder
System Description (Rear) .................................... 32 . INSPECTION FLOW ...........................................73 .
SWITCHES AND THEIR CONTROL FUNCTION 32 ... SYSTEM DESCRIPTION ....................................74 .
CAN Communication System Description ............. 33 . COMPONENT DESCRIPTION ...........................75 .
TROUBLE DIAGNOSIS ........................................... 34 . DIAGNOSTIC PROCEDURE FOR INTAKE
CONSULT-II Function (BCM) ................................. 34 . DOOR MOTOR ...................................................75 .
CONSULT-II START PROCEDURE ................... 34 . Front Blower Motor Circuit .....................................76 .
DATA MONITOR ................................................. 34 . INSPECTION FLOW ...........................................76 .
How to Perform Trouble Diagnosis for Quick and SYSTEM DESCRIPTION ....................................77 .
Accurate Repair ..................................................... 34 . COMPONENT DESCRIPTION ...........................78 .
WORK FLOW ..................................................... 34 . DIAGNOSTIC PROCEDURE FOR BLOWER
SYMPTOM TABLE ............................................. 34 . MOTOR ...............................................................78.
Component Parts and Harness Connector Location 36 ... COMPONENT INSPECTION ..............................82 .
ENGINE COMPARTMENT ................................. 36 . Rear Blower Motor Circuit ......................................83 .
FRONT PASSENGER COMPARTMENT ........... 37 . INSPECTION FLOW ...........................................83 .
REAR PASSENGER COMPARTMENT .............. 38 . SYSTEM DESCRIPTION ....................................84 .
Schematic .............................................................. 39 . DIAGNOSTIC PROCEDURE FOR REAR
Wiring Diagram --A/C,A-- .................................... 40 . BLOWER MOTOR ..............................................84 .
Front Air Control Terminals and Reference Values... 48 COMPONENT INSPECTION ..............................92 .
FRONT AIR CONTROL HARNESS CONNEC- Rear Air Control Circuit ..........................................94 .
TOR TERMINAL LAYOUT .................................. 48 . INSPECTION FLOW ...........................................94 .
TERMINALS AND REFERENCE VALUES FOR SYSTEM DESCRIPTION ....................................95 .
FRONT AIR CONTROL ...................................... 48 . DIAGNOSTIC PROCEDURE FOR REAR AIR
A/C System Self-diagnosis Function ..................... 50 . CONTROL ..........................................................95 .
DESCRIPTION ................................................... 50 . Magnet Clutch Circuit .............................................97 .
Operational Check (Front) ..................................... 52 . INSPECTION FLOW ...........................................97 .
CHECKING MEMORY FUNCTION .................... 52 . SYSTEM DESCRIPTION ....................................98 .
CHECKING BLOWER ........................................ 52 . DIAGNOSTIC PROCEDURE FOR MAGNET
CHECKING DISCHARGE AIR ........................... 52 . CLUTCH .............................................................98 .
CHECKING RECIRCULATION ........................... 52 . Insufficient Cooling ............................................... 103 .
CHECKING TEMPERATURE DECREASE ........ 52 . INSPECTION FLOW ......................................... 103 .
CHECKING TEMPERATURE INCREASE ......... 53 . PERFORMANCE TEST DIAGNOSES ............. 105 .
CHECK A/C SWITCH ......................................... 53 . PERFORMANCE CHART ................................. 107 .
CHECKING AUTO MODE .................................. 53 . TROUBLE DIAGNOSES FOR UNUSUAL PRES-
Operational Check (Rear) ...................................... 54 . SURE ................................................................ 108
.
CHECKING BLOWER ........................................ 54 . Insufficient Heating .............................................. 111 .
CHECKING TEMPERATURE DECREASE ........ 54 . INSPECTION FLOW ......................................... 111 .
CHECKING TEMPERATURE INCREASE ......... 54 . Heater Pump Circuit ............................................. 113 .
Power Supply and Ground Circuit for Front Air Con- SYSTEM DESCRIPTION .................................. 113 .
trol .......................................................................... 55
. DIAGNOSTIC PROCEDURE FOR HEATER
INSPECTION FLOW .......................................... 55 . PUMP CIRCUIT ................................................ 114 .
COMPONENT DESCRIPTION ........................... 56 . COMPONENT INSPECTION ............................ 115 .
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 56 ... Noise .................................................................... 116
.
Mode Door Motor Circuit ....................................... 58 . INSPECTION FLOW ......................................... 116 .
INSPECTION FLOW .......................................... 58 . Self-diagnosis ...................................................... 118.
SYSTEM DESCRIPTION ................................... 60 . INSPECTION FLOW ......................................... 118 .
COMPONENT DESCRIPTION ........................... 61 . Memory Function ................................................. 120 .
DIAGNOSTIC PROCEDURE FOR MODE INSPECTION FLOW ......................................... 120 .
DOOR MOTOR .................................................. 61 . Ambient Sensor 1 Circuit ..................................... 121 .
Air Mix Door Motor Circuit ..................................... 63 . COMPONENT DESCRIPTION ......................... 121 .
INSPECTION FLOW .......................................... 63 . AMBIENT TEMPERATURE INPUT PROCESS .121
SYSTEM DESCRIPTION ................................... 65 . DIAGNOSTIC PROCEDURE FOR AMBIENT
COMPONENT DESCRIPTION ........................... 66 . SENSOR 1 ........................................................ 121 .
DIAGNOSTIC PROCEDURE FOR AIR MIX COMPONENT INSPECTION ............................ 123 .
DOOR MOTOR (DRIVER) .................................. 66 . In-vehicle Sensor Circuit ...................................... 124 .
DIAGNOSTIC PROCEDURE FOR AIR MIX COMPONENT DESCRIPTION ......................... 124 .
DOOR MOTOR (PASSENGER) ......................... 68 . DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
DIAGNOSTIC PROCEDURE FOR AIR MIX SENSOR ........................................................... 124 .
DOOR MOTOR (REAR) ..................................... 70 . COMPONENT INSPECTION ............................ 126 .
Intake Door Motor Circuit ....................................... 73 . Optical Sensor Circuit .......................................... 127 .
Revision: September 2006 ATC-2 2007 Pathfinder
COMPONENT DESCRIPTION ........................ 127 . MODE DOOR MOTOR ........................................... 148 .
OPTICAL INPUT PROCESS ........................... 127 . Removal and Installation ..................................... 148 . A
DIAGNOSTIC PROCEDURE FOR OPTICAL REMOVAL ........................................................ 148 .
SENSOR .......................................................... 127 . INSTALLATION ................................................ 148 .
Intake Sensor Circuit ........................................... 129 . AIR MIX DOOR MOTOR ........................................ 149 . B
COMPONENT DESCRIPTION ........................ 129 . Components ........................................................ 149 .
DIAGNOSTIC PROCEDURE FOR INTAKE SEN- Removal and Installation ..................................... 149 .
SOR ................................................................. 129
. FRONT AIR MIX DOOR MOTOR (DRIVER) .... 149 .
COMPONENT INSPECTION ........................... 130 . FRONT AIR MIX DOOR MOTOR (PASSENGER) 149 . C
CONTROL UNIT .................................................... 131 . REAR AIR MIX DOOR MOTOR ....................... 150 .
Removal and Installation ..................................... 131 . VARIABLE BLOWER CONTROL .......................... 151 .
FRONT AIR CONTROL ................................... 131 . Removal and Installation ..................................... 151 . D
REAR AIR CONTROL ...................................... 131 . REMOVAL ........................................................ 151 .
AMBIENT SENSOR ............................................... 132 . INSTALLATION ................................................ 151 .
Removal and Installation ..................................... 132 . REAR BLOWER MOTOR RESISTOR ................... 152 . E
REMOVAL ........................................................ 132 . Removal and Installation ..................................... 152 .
INSTALLATION ................................................ 132 . REMOVAL ........................................................ 152 .
IN-VEHICLE SENSOR ........................................... 133 . INSTALLATION ................................................ 152 .
Removal and Installation ..................................... 133 . DUCTS AND GRILLES .......................................... 153 . F
REMOVAL ........................................................ 133 . Components ........................................................ 153 .
INSTALLATION ................................................ 133 . Removal and Installation ..................................... 155 .
OPTICAL SENSOR ............................................... 134 . DEFROSTER NOZZLE .................................... 155 . G
Removal and Installation ..................................... 134 . RH AND LH SIDE DEMISTER DUCT .............. 155 .
INTAKE SENSOR .................................................. 135 . RH AND LH VENTILATOR DUCT .................... 156 .
Removal and Installation ..................................... 135 . CENTER VENTILATOR DUCT ........................ 156 . H
REMOVAL ........................................................ 135 . FLOOR CONNECTOR DUCT .......................... 156 .
INSTALLATION ................................................ 135 . FRONT AND REAR FLOOR DUCTS ............... 156 .
BLOWER MOTOR ................................................. 136 . REAR OVERHEAD DUCTS ............................. 156 .
I
Components ........................................................ 136 . SIDE REAR FLOOR DUCT .............................. 157 .
Removal and Installation ..................................... 136 . GRILLES .......................................................... 157.
FRONT BLOWER MOTOR .............................. 136 . REFRIGERANT LINES .......................................... 158 .
REAR BLOWER MOTOR ................................ 137 . HFC-134a (R-134a) Service Procedure .............. 158 . ATC
IN-CABIN MICROFILTER ...................................... 138 . SETTING OF SERVICE TOOLS AND EQUIP-
Removal and Installation ..................................... 138 . MENT ............................................................... 158
.
FUNCTION ....................................................... 138 . Components ........................................................ 160 . K
REPLACEMENT TIMING ................................. 138 . Removal and Installation for Compressor ........... 162 .
REPLACEMENT PROCEDURE ...................... 138 . REMOVAL ........................................................ 162 .
HEATER & COOLING UNIT ASSEMBLY ............. 140 . INSTALLATION ................................................ 162 .
L
Components ........................................................ 140 . Removal and Installation for Compressor Clutch . 163
Removal and Installation ..................................... 141 . REMOVAL ........................................................ 163 .
FRONT HEATER AND COOLING UNIT ASSEM- INSPECTION ................................................... 164 .
BLY ................................................................... 141
. INSTALLATION ................................................ 164 . M
REAR HEATER AND COOLING UNIT ASSEM- BREAK-IN OPERATION ................................... 166 .
BLY ................................................................... 142
. Removal and Installation for Front High-pressure
HEATER CORE ..................................................... 144 . Flexible A/C Hose ................................................ 166 .
Components ........................................................ 144 . REMOVAL ........................................................ 166 .
Removal and Installation ..................................... 145 . INSTALLATION ................................................ 166 .
FRONT HEATER CORE .................................. 145 . Removal and Installation for Front High-pressure
REAR HEATER CORE .................................... 145 . A/C Pipe .............................................................. 166
.
HEATER PUMP ..................................................... 146 . REMOVAL ........................................................ 166 .
Removal and Installation ..................................... 146 . INSTALLATION ................................................ 166 .
REMOVAL ........................................................ 146 . Removal and Installation for Front Low-pressure
INSTALLATION ................................................ 146 . Flexible A/C Hose ................................................ 166 .
INTAKE DOOR MOTOR ........................................ 147 . REMOVAL ........................................................ 166 .
Removal and Installation ..................................... 147 . INSTALLATION ................................................ 166 .
REMOVAL ........................................................ 147 . Removal and Installation for Front Low-pressure A/
INSTALLATION ................................................ 147 . C Pipe .................................................................. 167
.
REMOVAL ........................................................ 167 .
INSTALLATION ................................................ 167 .
Revision: September 2006 ATC-3 2007 Pathfinder
Removal and Installation for Rear High- and Low- Removal and Installation for Front Expansion Valve.173
pressure A/C Pipes .............................................. 167 . REMOVAL ......................................................... 173 .
REMOVAL ........................................................ 167 . INSTALLATION ................................................. 173 .
INSTALLATION ................................................. 167 . Removal and Installation for Rear Expansion Valve.173
Removal and Installation for Underfloor Rear High- REMOVAL ......................................................... 173 .
and Low-pressure A/C and Heater Core Pipes ... 167 . INSTALLATION ................................................. 173 .
REMOVAL ........................................................ 167 . Checking for Refrigerant Leaks ........................... 174 .
INSTALLATION ................................................. 169 . Checking System for Leaks Using the Fluorescent
Removal and Installation for Refrigerant Pressure Dye Leak Detector ............................................... 174 .
Sensor ................................................................. 169
. Dye Injection ........................................................ 174
.
REMOVAL ........................................................ 169 . Electronic Refrigerant Leak Detector ................... 175 .
INSTALLATION ................................................. 169 . PRECAUTIONS FOR HANDLING LEAK
Removal and Installation for Condenser .............. 169 . DETECTOR ...................................................... 175 .
REMOVAL ........................................................ 169 . CHECKING PROCEDURE ............................... 176 .
INSTALLATION ................................................. 169 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 178 .
Removal and Installation for Front Evaporator .... 170 . Service Data and Specifications (SDS) ............... 178 .
REMOVAL ........................................................ 171 . COMPRESSOR ................................................ 178 .
INSTALLATION ................................................. 171 . OIL .................................................................... 178
.
Removal and Installation for Rear Evaporator ..... 172 . REFRIGERANT ................................................ 178 .
REMOVAL ........................................................ 172 . ENGINE IDLING SPEED .................................. 178 .
INSTALLATION ................................................. 173 . BELT TENSION ................................................ 178 .
Revision: September 2006 ATC-4 2007 Pathfinder
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS004O6
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) EJS004O7
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 oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components.
If oil other than that specified is used, compressor failure is likely to occur.
G The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following ATC
handling precautions must be observed:
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