MTC | Air Conditioner | Specifications | MTC Air Conditioner Specifications

MTC Air Conditioner Specifications
J AIR CONDITIONER
SECTION
MTC
MANUAL AIR CONDITIONER
A
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CONTENTS
PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER” .................................................................. 4
Precautions for Working with HFC-134a (R-134a)..... 4
Contaminated Refrigerant ........................................ 4
General Refrigerant Precautions .............................. 5
Precautions for Leak Detection Dye ......................... 5
A/C Identification Label ............................................ 5
Precautions for Refrigerant Connection ................... 5
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
CHARGING CYLINDER .......................................11
PREPARATION ......................................................... 12
Special Service Tools ............................................. 12
HFC-134a (R-134a) Service Tools and Equipment... 12
Commercial Service Tools ...................................... 15
REFRIGERATION SYSTEM ..................................... 16
Components ........................................................... 16
REFRIGERATION SYSTEM ............................... 16
Refrigerant Cycle ................................................... 17
REFRIGERANT FLOW ....................................... 17
FREEZE PROTECTION ..................................... 17
Refrigerant System Protection ............................... 17
REFRIGERANT PRESSURE SENSOR ............. 17
PRESSURE RELIEF VALVE ............................... 18
OIL ............................................................................ 19
Maintenance of Oil Quantity in Compressor .......... 19
OIL ...................................................................... 19
CHECKING AND ADJUSTING ........................... 19
Revision: February 2007
AIR CONDITIONER CONTROL ............................... 22
Description .............................................................. 22
Operation ................................................................ 22
AIR MIX DOOR CONTROL ................................. 22
BLOWER SPEED CONTROL ............................. 22
INTAKE DOORS CONTROL ............................... 22
MODE DOOR CONTROL ................................... 22
DEFROSTER DOOR CONTROL ........................ 22
MAGNET CLUTCH CONTROL ........................... 22
Description of Control System ................................ 24
Control Operation ................................................... 25
TEMPERATURE CONTROL DIAL (TEMPERATURE CONTROL) ............................................... 25
RECIRCULATION () SWITCH ............................. 25
DEFROSTER () SWITCH .................................... 25
REAR WINDOW DEFOGGER SWITCH ............. 25
OFF SWITCH (BLOWER SPEED SET TO 0) ..... 25
A/C SWITCH ....................................................... 25
MODE DIAL ......................................................... 25
FRONT BLOWER CONTROL DIAL .................... 25
Discharge Air Flow ................................................. 26
FRONT ................................................................ 26
System Description ................................................. 27
SWITCHES AND THEIR CONTROL FUNCTION... 27
CAN Communication System Description .............. 28
TROUBLE DIAGNOSIS ............................................ 29
CONSULT-II Function (BCM) ................................. 29
CONSULT-II BASIC OPERATION ....................... 29
DATA MONITOR ................................................. 30
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 31
WORK FLOW ...................................................... 31
SYMPTOM TABLE .............................................. 31
Component Parts and Harness Connector Location... 32
ENGINE COMPARTMENT .................................. 32
PASSENGER COMPARTMENT ......................... 33
Schematic ............................................................... 34
Wiring Diagram — A/C,M — ................................... 35
Front Air Control Terminals and Reference Value... 39
FRONT AIR CONTROL HARNESS CONNEC-
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TOR TERMINAL LAYOUT ................................... 39
TERMINALS AND REFERENCE VALUE FOR
FRONT AIR CONTROL ....................................... 39
Operational Check .................................................. 40
CHECKING BLOWER ......................................... 40
CHECKING DISCHARGE AIR ............................ 40
DISCHARGE AIR FLOW ..................................... 40
CHECKING RECIRCULATION ............................ 40
CHECKING TEMPERATURE DECREASE ......... 40
CHECKING TEMPERATURE INCREASE .......... 40
CHECK A/C SWITCH .......................................... 41
Power Supply and Ground Circuit for Front Air Control ........................................................................... 42
INSPECTION FLOW ........................................... 42
COMPONENT DESCRIPTION ............................ 43
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM... 43
Mode Door Motor Circuit ........................................ 45
INSPECTION FLOW ........................................... 45
SYSTEM DESCRIPTION .................................... 45
COMPONENT DESCRIPTION ............................ 46
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR ................................................... 47
Air Mix Door Motor Circuit ...................................... 49
INSPECTION FLOW ........................................... 49
SYSTEM DESCRIPTION .................................... 50
COMPONENT DESCRIPTION ............................ 50
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (FRONT) .................................... 51
Intake Door Motor Circuit ........................................ 53
INSPECTION FLOW ........................................... 53
SYSTEM DESCRIPTION .................................... 54
COMPONENT DESCRIPTION ............................ 54
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR ................................................... 55
Front Blower Motor Circuit ...................................... 57
INSPECTION FLOW ........................................... 57
SYSTEM DESCRIPTION .................................... 58
COMPONENT DESCRIPTION ............................ 58
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ............................................................... 59
COMPONENT INSPECTION .............................. 63
Magnet Clutch Circuit ............................................. 65
INSPECTION FLOW ........................................... 65
SYSTEM DESCRIPTION .................................... 66
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH .............................................................. 66
Insufficient Cooling ................................................. 70
INSPECTION FLOW ........................................... 70
PERFORMANCE TEST DIAGNOSES ................ 71
PERFORMANCE CHART ................................... 73
TROUBLE DIAGNOSES FOR UNUSUAL PRESSURE ................................................................... 74
Insufficient Heating ................................................. 77
INSPECTION FLOW ........................................... 77
Noise ...................................................................... 78
INSPECTION FLOW ........................................... 78
Intake Sensor Circuit .............................................. 80
COMPONENT DESCRIPTION ............................ 80
DIAGNOSTIC PROCEDURE FOR INTAKE SENRevision: February 2007
SOR .....................................................................80
COMPONENT INSPECTION ...............................81
CONTROL UNIT ........................................................82
Removal and Installation .........................................82
FRONT AIR CONTROL .......................................82
INTAKE SENSOR ......................................................83
Removal and Installation .........................................83
REMOVAL ............................................................83
INSTALLATION ....................................................83
BLOWER MOTOR .....................................................84
Components ............................................................84
Removal and Installation .........................................84
REMOVAL ............................................................84
INSTALLATION ....................................................84
IN-CABIN MICROFILTER ..........................................85
Removal and Installation .........................................85
FUNCTION ..........................................................85
REPLACEMENT TIMING ....................................85
REPLACEMENT PROCEDURE ..........................85
HEATER & COOLING UNIT ASSEMBLY .................87
Components ............................................................87
Removal and Installation .........................................87
REMOVAL ............................................................87
INSTALLATION ....................................................88
HEATER CORE .........................................................89
Components ............................................................89
Removal and Installation .........................................89
REMOVAL ............................................................89
INSTALLATION ....................................................89
INTAKE DOOR MOTOR ............................................90
Removal and Installation .........................................90
REMOVAL ............................................................90
INSTALLATION ....................................................90
MODE DOOR MOTOR ..............................................91
Removal and Installation .........................................91
REMOVAL ............................................................91
INSTALLATION ....................................................91
AIR MIX DOOR MOTOR ...........................................92
Components ............................................................92
Removal and Installation .........................................92
REMOVAL ............................................................92
INSTALLATION ....................................................92
FRONT BLOWER MOTOR RESISTOR ....................93
Removal and Installation .........................................93
REMOVAL ............................................................93
INSTALLATION ....................................................93
DUCTS AND GRILLES .............................................94
Components ............................................................94
Removal and Installation .........................................95
CONSOLE DUCTS AND CONSOLE GRILLE .....95
DEFROSTER NOZZLE ........................................96
RH AND LH SIDE DEMISTER DUCTS ...............96
RH AND LH VENTILATOR DUCTS .....................96
CENTER VENTILATOR DUCT ............................96
FLOOR CONNECTOR DUCT .............................96
FRONT AND REAR FLOOR DUCTS ..................96
GRILLES ..............................................................97
REFRIGERANT LINES .............................................98
HFC-134a (R-134a) Service Procedure ..................98
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2006 Pathfinder
SETTING OF SERVICE TOOLS AND EQUIPMENT .................................................................. 98
Components ......................................................... 100
Removal and Installation for Compressor ............ 101
COMPONENTS ................................................ 101
REMOVAL ......................................................... 101
INSTALLATION ................................................. 101
Removal and Installation for Compressor Clutch . 102
REMOVAL ......................................................... 102
INSPECTION .................................................... 103
INSTALLATION ................................................. 103
BREAK-IN OPERATION ................................... 105
Removal and Installation for High-pressure Flexible
A/C Hose .............................................................. 105
REMOVAL ......................................................... 105
INSTALLATION ................................................. 105
Removal and Installation for High-pressure A/C
Pipe ...................................................................... 105
REMOVAL ......................................................... 105
INSTALLATION ................................................. 105
Removal and Installation for Low-pressure Flexible
A/C Hose .............................................................. 105
REMOVAL ......................................................... 105
INSTALLATION ................................................. 105
Removal and Installation for Low-pressure A/C Pipe. 106
REMOVAL ......................................................... 106
INSTALLATION ................................................. 106
Removal and Installation for Refrigerant Pressure
Sensor .................................................................. 106
REMOVAL ......................................................... 106
INSTALLATION ................................................. 106
Removal and Installation for Condenser .............. 106
REMOVAL ......................................................... 106
INSTALLATION ................................................. 107
Removal and Installation for Evaporator .............. 108
REMOVAL ......................................................... 109
INSTALLATION ................................................. 109
Removal and Installation for Expansion Valve ...... 109
REMOVAL ......................................................... 109
INSTALLATION ................................................. 109
Checking for Refrigerant Leaks ............................ 109
Checking System for Leaks Using the Fluorescent
Dye Leak Detector ................................................ 109
Dye Injection ......................................................... 110
Electronic Refrigerant Leak Detector .................... 110
PRECAUTIONS FOR HANDLING LEAK
DETECTOR ....................................................... 110
CHECKING PROCEDURE ................................111
SERVICE DATA AND SPECIFICATIONS (SDS) .... 113
Service Data and Specifications (SDS) ................ 113
COMPRESSOR ................................................ 113
OIL ..................................................................... 113
REFRIGERANT ................................................. 113
ENGINE IDLING SPEED .................................. 113
BELT TENSION ................................................. 113
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Revision: February 2007
MTC-3
2006 Pathfinder
PRECAUTIONS
PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EJS004QR
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 Manual.
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 performed by an authorized NISSAN/INFINITI dealer.
●
Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal 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)
EJS004QS
WARNING:
●
CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed compressor failure is likely to occur. Refer MTC-4, "Contaminated Refrigerant" . 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 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.
●
The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following
handling precautions must be observed:
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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 possible to minimize the entry of moisture into system.
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Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without
proper sealing, oil will become moisture saturated and should not be used.
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Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting
requirements of SAE J2210 [HFC-134a (R-134a) recycling equipment], or SAE J2209 [HFC-134a (R134a) recovery equipment]. If accidental system discharge occurs, ventilate work area before
resuming service. Additional health and safety information may be obtained from refrigerant and
oil manufacturers.
–
Do not allow the refrigerant oil to come in contact with styrofoam parts. Damage may result.
Contaminated Refrigerant
EJS004QT
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.
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Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant supply.
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Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
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If you choose to perform the repair, recover the refrigerant using only dedicated equipment and containers. Do not recover contaminated refrigerant into your existing service equipment. If your facility
Revision: February 2007
MTC-4
2006 Pathfinder
PRECAUTIONS
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does not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available service. This refrigerant must be disposed of in accordance with all federal and local regulations. In
addition, replacement of all refrigerant system components on the vehicle is recommended.
If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN
Customer Affairs for further assistance.
General Refrigerant Precautions
Precautions for Leak Detection Dye
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EJS004QU
WARNING:
●
Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.
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Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or
air conditioning system.
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Do not store or heat refrigerant containers above 52°C (125°F).
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Do not heat a refrigerant container with an open flame; if container warming is required, place the
bottom of the container in a warm pail of water.
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Do not intentionally drop, puncture, or incinerate refrigerant containers.
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Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
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Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent
suffocation.
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Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air conditioning systems with compressed air during repair. Some mixtures of air and HFC-134a (R-134a)
have been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause
injury or property damage. Additional health and safety information may be obtained from refrigerant manufacturers.
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EJS004QV
The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet
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(UV) lamp is required to illuminate the dye when inspecting for leaks.
Always wear fluorescence enhancing UV safety goggles to protect your eyes and enhance the visibility of
the fluorescent dye.
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The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluorescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector (J41995).
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For your safety and the customer's satisfaction, read and follow all manufacturer's operating instructions
and precautions prior to performing work.
A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal
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should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).
Always remove any remaining dye from the leak area after repairs are complete to avoid a misdiagnosis
during a future service.
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Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled,
clean immediately with the approved dye cleaner. Fluorescent dye left on a surface for an extended period
of time cannot be removed .
Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.).
Do not use more than one refrigerant dye bottle (1/4 ounce / 7.4 cc) per A/C system.
Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12) A/C systems are different. Do not use
HFC-134a (R-134a) leak detection dye in CFC-12 (R-12) A/C systems or CFC-12 (R-12) leak detection
dye in HFC-134a (R-134a) A/C systems or A/C system damage may result.
The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure
occurs.
A/C Identification Label
EJS004QW
Vehicles with factory installed fluorescent dye have this identification label on the underside of hood.
Precautions for Refrigerant Connection
EJS004QX
A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.
Revision: February 2007
MTC-5
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PRECAUTIONS
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Expansion valve to cooling unit
Evaporator pipes to evaporator (inside cooling unit)
Refrigerant pressure sensor
FEATURES OF NEW TYPE REFRIGERANT CONNECTION
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The O-ring has been relocated. It has also been provided with a groove for proper installation. This
reduces the possibility of the O-ring being caught in, or damaged by, the mating part. The sealing direction
of the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing
characteristics.
The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facilitating piping connections.
SHA815E
Revision: February 2007
MTC-6
2006 Pathfinder
PRECAUTIONS
O-RING AND REFRIGERANT CONNECTION
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A/C Compressor and Condenser
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WJIA1253E
Revision: February 2007
MTC-7
2006 Pathfinder
PRECAUTIONS
1.
High-pressure service valve
4.
Refrigerant pressure sensor
7.
High-pressure flexible A/C hose
10. Low-pressure A/C pipe
2.
Clip
3.
High-pressure A/C pipe
5.
Condenser
6.
Compressor shaft seal
8.
Low-pressure flexible A/C hose
9.
Low-pressure service valve
11. Expansion valve
12. A/C drain hose
CAUTION:
The new and former refrigerant connections use different O-ring configurations. Do not confuse Orings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at or
around the connection.
O-Ring Part Numbers and Specifications
Connection type
O-ring
size
Part number*
D
New
8
92471 N8210
6.8 (0.268)
1.85 (0.0728)
Former
10
J2476 89956
9.25 (0.3642)
1.78 (0.0701)
92472 N8210
10.9 (0.429)
2.43 (0.0957)
New
Former
New
Former
New
SHA814E
Former
New
12
16
19
24
mm (in)
W mm (in)
92475 71L00
11.0 (0.433)
2.4 (0.094)
92473 N8210
13.6 (0.535)
2.43 (0.0957)
92475 72L00
14.3 (0.563)
2.3 (0.091)
92474 N8210
16.5 (0.650)
2.43 (0.0957)
92477 N8200
17.12 (0.6740)
1.78 (0.0701)
92195 AH300
21.8 (0.858)
2.4 (0.094)
*: Always check with the Parts Department for the latest parts information.
WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
●
When the compressor is removed, store it in the same position as it is when mounted on the car.
Failure to do so will cause oil to enter the low pressure chamber.
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When connecting tubes, always use a torque wrench and a back-up wrench.
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After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
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When installing an air conditioner in the vehicle, connect the pipes as the final stage of the operation. Do not remove the seal caps of pipes and other components until just before required for
connection.
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Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.
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Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
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Always replace used O-rings.
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When connecting tube, apply oil to circle of the O-rings shown in illustration. Be careful not to
apply oil to threaded portion.
Oil name: NISSAN A/C System Oil Type S or equivalent
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O-ring must be closely attached to dented portion of tube.
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When replacing the O-ring, be careful not to damage O-ring and tube.
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Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that
the O-ring is installed to tube correctly.
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After connecting line, conduct leak test and make sure that there is no leakage from connections.
When the refrigerant leaking point is found, disconnect that line and replace the O-ring. Then
tighten connections of seal seat to the specified torque.
Revision: February 2007
MTC-8
2006 Pathfinder
PRECAUTIONS
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B
C
D
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WJIA1994E
1.
Plug
2.
O-ring
A.
Torque wrench
B.
Apply oil
C.
Do not apply oil to thread
D.
No good
E.
Good
Precautions for Servicing Compressor
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EJS004QY
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Plug all openings to prevent moisture and foreign matter from entering.
When the compressor is removed, store it in the same position as it is when mounted on the car.
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When replacing or repairing compressor, follow “Maintenance of Oil Quantity in Compressor”
exactly. Refer to MTC-19, "Maintenance of Oil Quantity in Compressor" .
Keep friction surfaces between clutch and pulley clean. If the surface is contaminated with oil,
MTC
wipe it off by using a clean waste cloth moistened with thinner.
After compressor service operation, turn the compressor shaft by hand more than 5 turns in both
directions. This will equally distribute oil inside the compressor. After the compressor is installed,
let the engine idle and operate the compressor for 1 hour.
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After replacing the compressor magnet clutch, apply voltage to the new one and check for normal
operation. Refer to MTC-102, "Removal and Installation for Compressor Clutch" .
Precautions for Service Equipment
EJS004QZ
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RECOVERY/RECYCLING EQUIPMENT
Follow the manufacturer's instructions for machine operation and machine maintenance. Never introduce any
refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operation and tester maintenance.
Revision: February 2007
MTC-9
2006 Pathfinder
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PRECAUTIONS
VACUUM PUMP
The oil contained inside the vacuum pump is not compatible with the
specified oil for HFC-134a (R-134a) A/C systems. The vent side of
the vacuum pump is exposed to atmospheric pressure so the vacuum pump oil may migrate out of the pump into the service hose.
This is possible when the pump is switched off after evacuation (vacuuming) and hose is connected to it.
To prevent this migration, use a manual valve situated near the
hose-to-pump connection, as follows.
●
Usually vacuum pumps have a manual isolator valve as part of
the pump. Close this valve to isolate the service hose from the
pump.
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For pumps without an isolator, use a hose equipped with a manual shut-off valve near the pump end. Close the valve to isolate
the hose from the pump.
●
If the hose has an automatic shut off valve, disconnect the hose
from the pump: as long as the hose is connected, the valve is
open and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close
under a no vacuum condition. Such valves may restrict the pump's
ability to pull a deep vacuum and are not recommended.
RHA270D
MANIFOLD GAUGE SET
Be certain that the gauge face indicates HFC-134a (R-134a). Make
sure the gauge set has 1/2″-16 ACME threaded connections for service hoses. Confirm the set has been used only with refrigerant
HFC-134a (R-134a) along with specified oil.
SHA533D
SERVICE HOSES
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shutoff devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.
RHA272D
Revision: February 2007
MTC-10
2006 Pathfinder
PRECAUTIONS
SERVICE COUPLERS
A
Never attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. If an improper
connection is attempted, discharging and contamination may occur.
Shut-off valve rotation
B
A/C service valve
Clockwise
Open
Counterclockwise
Close
C
RHA273D
D
REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFC134a (R-134a) and specified
oils have been used with the scale. If the scale controls refrigerant
flow electronically, the hose fitting must be 1/2”-16 ACME.
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RHA274D
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CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder's top valve
when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an
electronic scale or of quality recycle/recharge equipment.
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Revision: February 2007
MTC-11
2006 Pathfinder
PREPARATION
PREPARATION
Special Service Tools
PFP:00002
EJS004R1
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
Description
—
(J-38873-A)
Pulley installer
Installing pulley
LHA171
KV99233130
(J-29884)
Pulley puller
Removing pulley
LHA172
HFC-134a (R-134a) Service Tools and Equipment
EJS004R2
Never mix HFC-134a (R-134a) refrigerant and/or the specified oil with CFC-12 (R-12) refrigerant and/or the
oil.
Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/oil.
Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles
refrigerant and/or oil) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid mixed
use of the refrigerants/oil.
Adapters that convert one size fitting to another must never be used refrigerant/oil contamination will occur
and compressor failure will result.
Tool number
(Kent-Moore No.)
Tool name
Description
HFC-134a (R-134a)
( — )
Refrigerant
Container color: Light blue
Container marking: HFC-134a (R134a)
Fitting size: Thread size
●
large container 1/2”-16 ACME
S-NT196
—
( — )
NISSAN A/C System Oil Type S
Type: Poly alkylene glycol oil (PAG),
type S
Application: HFC-134a (R-134a)
swash plate compressors (NISSAN
only)
Lubricity: 40 m (1.4 US fl oz, 1.4 Imp
fl oz)
S-NT197
KV991J0130
(ACR2005-NI)
ACR A/C Service Center
Refrigerant Recovery and Recycling
and Recharging
WJIA0293E
Revision: February 2007
MTC-12
2006 Pathfinder
PREPARATION
Tool number
(Kent-Moore No.)
Tool name
Description
—
(J-41995)
Electronic refrigerant leak detector
Power supply:
A
●
DC 12V (battery terminal)
B
C
D
AHA281A
—
(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220)
UV lamp and UV safety goggles
(J-41459)
Refrigerant dye injector
(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye (box of 24, 1/4
ounce bottles)
(J-43872)
Refrigerant dye cleaner
E
Power supply:
●
DC 12V (battery terminal)
F
G
H
ZHA200H
—
(J-42220)
Fluorescent dye leak detector
Power supply:
●
I
DC 12V (battery terminal)
For checking refrigerant leak when fluorescent dye is installed in A/C system.
Includes: UV lamp and UV safety goggles
MTC
SHA438F
Application: For HFC-134a (R-134a)
PAG oil
Container: 1/4 ounce (7.4cc) bottle
(Includes self-adhesive dye identification labels for affixing to vehicle after
charging system with dye.)
—
(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(box of 24, 1/4 ounce bottles)
K
L
M
SHA439F
For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.
—
(J-41459)
HFC-134a (R-134a) Refrigerant
dye injector
Use with J-41447, 1/4 ounce bottle
SHA440F
For cleaning dye spills.
—
(J-43872)
Refrigerant dye cleaner
SHA441F
Revision: February 2007
MTC-13
2006 Pathfinder
PREPARATION
Tool number
(Kent-Moore No.)
Tool name
Description
—
(J-39183-C)
Manifold gauge set (with hoses
and couplers)
Identification:
●
The gauge face indicates R-134a.
Fitting size-Thread size
●
1/2”-16 ACME
RJIA0196E
Hose color:
Service hoses:
●
High side hose
(J-39500-72B)
●
Low side hose
(J-39500-72R)
●
Utility hose
(J-39500-72Y)
S-NT201
High side coupler
(J-39500-20A)
●
Low side coupler
(J-39500-24A)
Low side hose: Blue with black stripe
●
High side hose: Red with black stripe
●
Utility hose: Yellow with black stripe
or green with black stripe
Hose fitting to gauge:
●
1/2”-16 ACME
Hose fitting to service hose:
Service couplers
●
●
●
M14 x 1.5 fitting is optional or permanently attached.
S-NT202
For measuring of refrigerant
Fitting size-Thread size
—
(J-39699)
Refrigerant weight scale
●
1/2”-16 ACME
S-NT200
Capacity:
—
(J-39649)
Vacuum pump
(Including the isolator valve)
●
Air displacement: 4 CFM
●
Micron rating: 20 microns
●
Oil capacity: 482 g (17 oz)
Fitting size-Thread size
●
1/2”-16 ACME
S-NT203
Revision: February 2007
MTC-14
2006 Pathfinder
PREPARATION
Commercial Service Tools
EJS004R3
A
Tool name
Description
(J-41810-NI)
Refrigerant identifier equipment (R134a)
For checking refrigerant purity and
system contamination
B
C
D
RJIA0197E
Power tool
Loosening bolts and nuts
E
F
PBIC0190E
(J-44614)
Clutch disc holding tool
G
Clutch disc holding tool
H
I
WHA230
MTC
K
L
M
Revision: February 2007
MTC-15
2006 Pathfinder
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM
Components
PFP:KA990
EJS004R4
REFRIGERATION SYSTEM
LJIA0155E
Revision: February 2007
MTC-16
2006 Pathfinder
REFRIGERATION SYSTEM
1.
Defroster nozzle
2.
LH side demister duct
3.
LH ventilator duct
4.
RH side demister duct
5.
RH ventilator duct
6.
Center ventilator duct
7.
Front heater and cooling unit assembly
8.
Floor connector duct grilles
9.
Floor connector duct
10. Front ducts
11. Floor ducts
13. Center console duct
14. Front console duct
Refrigerant Cycle
A
12. Rear console duct
B
EJS004R5
C
D
E
F
G
H
I
MTC
RJIA1552E
K
REFRIGERANT FLOW
The refrigerant flows in the standard pattern. Refrigerant flows through the compressor, condenser, liquid tank,
expansion valve, evaporator, and back to the compressor. The refrigerant evaporation through the evaporator
coil is controlled by an externally equalized expansion valve, located inside the evaporator case.
FREEZE PROTECTION
The compressor cycles on and off to maintain the evaporator temperature within a specified range. When the
evaporator coil temperature falls below a specified point, the intake sensor interrupts the compressor operation. When the evaporator coil temperature rises above the specification, the intake sensor allows compressor
operation.
Refrigerant System Protection
EJS004R6
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sensor, located on the condenser. If the system pressure rises above or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM.
The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high
pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm2 , 398 psi), or below
about 120 kPa (1.22 kg/cm2 , 17.4 psi).
Revision: February 2007
MTC-17
2006 Pathfinder
L
M
REFRIGERATION SYSTEM
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an abnormal level [more than 2,990 kPa (30.5 kg/
cm2 , 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant
into the atmosphere.
Revision: February 2007
MTC-18
2006 Pathfinder
OIL
OIL
Maintenance of Oil Quantity in Compressor
PFP:KLG00
A
EJS004R7
The oil in the compressor circulates through the system with the refrigerant. Add oil to compressor when
replacing any component or after a large refrigerant leakage has occurred. It is important to maintain the specified amount.
If oil quantity is not maintained properly, the following malfunctions may result:
●
Lack of oil: May lead to a seized compressor
●
Excessive oil: Inadequate cooling (thermal exchange interference)
B
C
OIL
D
Oil name: NISSAN A/C System Oil Type S or equivalent
CHECKING AND ADJUSTING
CAUTION:
If excessive oil leakage is noted, do not perform the oil return operation.
Start the engine and set the following conditions:
Test Conditions
●
Engine speed: idling to 1,200 rpm
●
A/C switch: ON
●
Blower fan speed: HIGH
●
Temperature control: optional [set so intake air temperature is 25° to 30° C (77° to 86°F)]
●
Intake position: RECIRCULATION mode
●
Perform oil return operation for about ten minutes
Adjust the oil quantity according to the following table.
Oil Adjusting Procedure for Components Replacement Except Compressor
After replacing any of the following major components, add the correct amount of oil to the system.
E
F
G
H
I
Amount of Oil to be Added
MTC
Oil to be added to system
Part replaced
m
Amount of oil
(US fl oz, Imp fl oz)
Remarks
K
Evaporator
75 (2.5, 2.6)
Condenser
75 (2.5, 2.6)
—
Liquid tank
5 (0.2, 0.2)
Add if compressor is not replaced.
30 (1.0, 1.1)
Large leak
—
Small leak *1
In case of refrigerant leak
—
M
*1: If refrigerant leak is small, no addition of oil is needed.
Revision: February 2007
L
MTC-19
2006 Pathfinder
OIL
Oil Adjustment Procedure for Compressor Replacement
WJIA1716E
1.
2.
3.
4.
5.
6.
7.
8.
9.
1.
New compressor
2.
Old compressor
3.
Recovery/recycling equipment
4.
Measuring cup X
5.
Measuring cup Y
6.
New oil
A.
Drain oil from the new compressor
into clean container
B.
Record amount of oil recovered
C.
Add an additional 5 m (0.2 US fl oz,
0.2 Imp fl oz) of new oil when replacing liquid tank
D.
Install new oil equal to recorded
amounts in measuring cups X plus Y
Before connecting recovery/recycling equipment to vehicle, check recovery/recycling equipment gauges.
No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines.
Connect recovery/recycling equipment to vehicle. Confirm refrigerant purity in supply tank using recovery/
recycling equipment and refrigerant identifier. If NG, refer to MTC-4, "Contaminated Refrigerant" .
Confirm refrigerant purity in vehicle A/C system using recovery/recycling equipment and refrigerant identifier. If NG, refer to MTC-4, "Contaminated Refrigerant" .
Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure oil discharged into the
recovery/recycling equipment.
Drain the oil from the “old” (removed) compressor into a graduated container and recover the amount of
oil drained.
Drain the oil from the “new” compressor into a separate, clean container.
Measure an amount of new oil installed equal to amount drained from “old” compressor. Add this oil to
“new” compressor through the suction port opening.
Measure an amount of new oil equal to the amount recovered during discharging. Add this oil to “new”
compressor through the suction port opening.
If the liquid tank also needs to be replaced, add an additional 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil at this
time.
Revision: February 2007
MTC-20
2006 Pathfinder
OIL
Do not add this 5 m
(0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor.
A
B
C
D
E
F
G
H
I
MTC
K
L
M
Revision: February 2007
MTC-21
2006 Pathfinder
AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL
Description
PFP:27500
EJS004R8
The front air control provides regulation of the vehicle's interior temperature. The system is based on the position of the front air controls temperature switch selected by the driver. This is done by utilizing a microcomputer, also referred to as the front air control, which receives input signals from the following two sensors:
●
Intake sensor
●
PBR (position balanced resistor)
The front air control uses these signals (including the set position of the temperature switch) to control:
●
Outlet air volume
●
Air temperature
●
Air distribution
Operation
EJS004R9
AIR MIX DOOR CONTROL
The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature
control dial.
BLOWER SPEED CONTROL
Blower speed is controlled based on front blower switch settings.
When blower switch is turned, the blower motor starts and increases air flow volume each time the blower
switch is turned counterclockwise, and decreases air flow volume each time the blower switch is turned counterclockwise.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flowing.
INTAKE DOORS CONTROL
The intake doors are controlled by the recirculation switch setting, and the mode (defroster) switch setting.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode dial.
DEFROSTER DOOR CONTROL
The defroster door is controlled by the defroster dial set to defroster.
MAGNET CLUTCH CONTROL
WJIA1293E
When the A/C switch is pressed, or the mode dial is turned to the defroster position, the front air control outputs a compressor ON signal to BCM.
The BCM then sends a compressor ON signal to ECM, via CAN communication line.
Revision: February 2007
MTC-22
2006 Pathfinder
AIR CONDITIONER CONTROL
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sensor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate compressor.
A
B
C
D
E
F
G
H
I
MTC
K
L
M
Revision: February 2007
MTC-23
2006 Pathfinder
AIR CONDITIONER CONTROL
Description of Control System
EJS004RA
The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.
The relationship of these components is shown in the figure below:
WJIA1294E
Revision: February 2007
MTC-24
2006 Pathfinder
AIR CONDITIONER CONTROL
Control Operation
EJS004RB
A
Front air control
B
C
D
E
F
WJIA1510E
1.
Temperature control dial
2.
Blower control dial
3.
A/C switch
4.
Rear window defogger switch
5.
Recirculation switch
6.
Mode dial
G
H
TEMPERATURE CONTROL DIAL (TEMPERATURE CONTROL)
Increases or decreases the set temperature.
I
RECIRCULATION () SWITCH
●
●
●
When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.
When REC switch is turned OFF, or when compressor is turned from ON to OFF, REC switch is automati- MTC
cally turned OFF. REC mode can be re-entered by pressing REC switch again.
REC switch is not operated when DEF switch is turned ON, or at the D/F position.
DEFROSTER () SWITCH
K
Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position.
REAR WINDOW DEFOGGER SWITCH
L
When switch is ON, rear window is defogged.
OFF SWITCH (BLOWER SPEED SET TO 0)
M
The compressor and blower are OFF.
A/C SWITCH
The compressor is ON or OFF.
(Pressing the A/C switch when the AUTO switch is ON will turn off the A/C switch and compressor.)
MODE DIAL
Controls the air discharge outlets.
FRONT BLOWER CONTROL DIAL
Manually controls the four blower speeds.
Revision: February 2007
MTC-25
2006 Pathfinder
AIR CONDITIONER CONTROL
Discharge Air Flow
EJS004RC
FRONT
WJIA1296E
Air outlet/distribution
Mode door position
Vent
Foot
Defroster
95%
5%
—
60%
40%
—
20%
55%
25%
15%
50%
35%
7%
15%
78%
Airflow always present at driver and passenger side demisters
Revision: February 2007
MTC-26
2006 Pathfinder
AIR CONDITIONER CONTROL
System Description
EJS004RD
A
SWITCHES AND THEIR CONTROL FUNCTION
B
C
D
E
F
G
H
I
WJIA1496E
MTC
K
L
M
WJIA1497E
Revision: February 2007
MTC-27
2006 Pathfinder
AIR CONDITIONER CONTROL
CAN Communication System Description
EJS004RE
Refer to LAN-25, "CAN COMMUNICATION" .
Revision: February 2007
MTC-28
2006 Pathfinder
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
CONSULT-II Function (BCM)
PFP:00004
A
EJS004RF
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
BCM diagnostic
test item
Diagnostic mode
WORK SUPPORT
DATA MONITOR
ACTIVE TEST
Inspection by part
SELF-DIAG RESULTS
CAN DIAG SUPPORT MNTR
ECU PART NUMBER
CONFIGURATION
B
Description
Supports inspections and adjustments. Commands are transmitted to the BCM
for setting the status suitable for required operation, input/output signals are
received from the BCM and received data is displayed.
C
Displays BCM input/output data in real time.
Operation of electrical loads can be checked by sending drive signal to them.
D
Displays BCM self-diagnosis results.
The result of transmit/receive diagnosis of CAN communication can be read.
BCM part number can be read.
E
Performs BCM configuration read/write functions.
F
CONSULT-II BASIC OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and CONSULT-II CONVERTER to the data link connector, and turn the
ignition switch ON.
G
H
I
MTC
WJIA1078E
2.
K
Touch “START (NISSAN BASED VHCL)”.
L
M
BCIA0029E
3.
Touch “BCM” on “SELECT SYSTEM” screen.
If “BCM” is not indicated, go to GI-40, "CONSULT-II Data Link
Connector (DLC) Circuit" .
BCIA0030E
Revision: February 2007
MTC-29
2006 Pathfinder
TROUBLE DIAGNOSIS
DATA MONITOR
Operation Procedure
1.
Touch “AIR CONDITIONER” on “SELECT TEST ITEM” screen.
WJIA0468E
2.
Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
BCIA0031E
3.
Touch either “ALL SIGNALS” or “SELECTION FROM MENU” on
“DATA MONITOR” screen.
ALL SIGNALS
Monitors all the items.
SELECTION FROM
MENU
Selects and monitors the individual item selected.
4.
5.
6.
When “SELECTION FROM MENU” is selected, touch items to
be monitored. When “ALL SIGNALS” is selected, all the items
will be monitored.
Touch “START”.
Touch “RECORD” while monitoring, then the status of the monitored item can be recorded. To stop recording, touch “STOP”.
WJIA0469E
Display Item List
Monitor item name
“OPERATION OR UNIT”
Contents
IGN ON SW
“ON/OFF”
Displays “IGN Position (ON)/OFF, ACC Position (OFF)” status as judged from ignition switch signal.
COMP ON SIG
“ON/OFF”
Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.
FAN ON SIG
“ON/OFF”
Displays “FAN (ON)/FAN (OFF)” status as judged from blower motor switch signal.
Revision: February 2007
MTC-30
2006 Pathfinder
TROUBLE DIAGNOSIS
How to Perform Trouble Diagnosis for Quick and Accurate Repair
EJS004RG
A
WORK FLOW
B
C
D
SHA900E
*1
ATC-53, "Operational Check
(Front)".
E
SYMPTOM TABLE
Symptom
A/C system does not come on.
Air outlet does not change.
Mode door motor is malfunctioning.
Discharge air temperature does not change.
Air mix door motor is malfunctioning.
Intake door does not change.
Reference Page
F
Go to Trouble Diagnosis Procedure for A/C System.
MTC-42
Go to Trouble Diagnosis Procedure for Mode Door Motor.
MTC-45
Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
MTC-49
H
Go to Trouble Diagnosis Procedure for Intake Door Motor.
MTC-53
Front blower motor operation is malfunctioning.
Go to Trouble Diagnosis Procedure for Front Blower Motor.
MTC-57
Magnet clutch does not engage.
Go to Trouble Diagnosis Procedure for Magnet Clutch.
MTC-65
Insufficient cooling
Go to Trouble Diagnosis Procedure for Insufficient Cooling.
MTC-70
Insufficient heating
Go to Trouble Diagnosis Procedure for Insufficient Heating.
MTC-77
Noise
Go to Trouble Diagnosis Procedure for Noise.
MTC-78
Intake door motor is malfunctioning.
G
I
MTC
K
L
M
Revision: February 2007
MTC-31
2006 Pathfinder
TROUBLE DIAGNOSIS
Component Parts and Harness Connector Location
EJS004RH
ENGINE COMPARTMENT
WJIA1489E
Revision: February 2007
MTC-32
2006 Pathfinder
TROUBLE DIAGNOSIS
PASSENGER COMPARTMENT
A
B
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1301E
Revision: February 2007
MTC-33
2006 Pathfinder
TROUBLE DIAGNOSIS
Schematic
EJS004RI
WJWA0446E
Revision: February 2007
MTC-34
2006 Pathfinder
TROUBLE DIAGNOSIS
Wiring Diagram — A/C,M —
EJS004RJ
A
B
C
D
E
F
G
H
I
MTC
K
L
M
WJWA0397E
Revision: February 2007
MTC-35
2006 Pathfinder
TROUBLE DIAGNOSIS
WJWA0414E
Revision: February 2007
MTC-36
2006 Pathfinder
TROUBLE DIAGNOSIS
A
B
C
D
E
F
G
H
I
MTC
K
L
M
WJWA0415E
Revision: February 2007
MTC-37
2006 Pathfinder
TROUBLE DIAGNOSIS
WJWA0492E
Revision: February 2007
MTC-38
2006 Pathfinder
TROUBLE DIAGNOSIS
Front Air Control Terminals and Reference Value
EJS004RK
A
Measure voltage between each terminal and ground by following
Terminals and Reference Value for front air control.
B
C
D
WJIA1302E
FRONT AIR CONTROL HARNESS CONNECTOR TERMINAL LAYOUT
E
F
G
WJIA2011E
H
TERMINALS AND REFERENCE VALUE FOR FRONT AIR CONTROL
Ignition
switch
Voltage (V)
(Approx.)
Terminal No.
Wire
color
1
BR
Mode door motor CW
ON
Clockwise rotation
Battery voltage
2
W
Air mix door motor (Driver) CW
ON
Clockwise rotation
Battery voltage
3
G/R
Air mix door motor (Driver) CCW
ON
Counterclockwise rotation
Battery voltage
4
Y
Intake door motor CW
ON
Clockwise rotation
Battery voltage
5
O
Intake door motor CCW
ON
Counterclockwise rotation
Battery voltage
6
W/G
Power supply for IGN
ON
10
W
Compressor ON signal
11
Y
Rear defrost request
ON
-
Battery voltage
12
L
Intake sensor
ON
-
0 - 5V
13
V
Sensor ground
ON
-
0 - 5V
14
R
Mode door motor CCW
ON
18
BR
Front blower monitor
ON
19
R/Y
Power supply for BAT
-
20
B
Ground
-
-
0V
21
V
Mode door motor feedback
ON
-
0 - 5V
22
SB
Air mix door motor (Front) feedback
ON
-
0 - 5V
23
G
Power supply for mode door motor
and air mix door motor (Front) PBR
ON
-
5V
25
R
Rear defroster request
ON
-
Battery voltage
P
Ground for mode door motor and air
mix door motor (Front) PBR
ON
-
0V
26
Item
Revision: February 2007
Condition
A/C switch OFF
5V
ON
A/C switch ON
0V
Counterclockwise rotation
Battery voltage
Front blower motor OFF
Battery voltage
Front blower motor ON
0V
MTC-39
MTC
K
Battery voltage
ON
-
I
Battery voltage
2006 Pathfinder
L
M
TROUBLE DIAGNOSIS
Operational Check
EJS004RL
The purpose of the operational check is to confirm that the system operates properly.
Conditions
: Engine running and at normal operating temperature
CHECKING BLOWER
1. Turn blower control dial clockwise. Blower should operate on low speed.
2. Turn the blower control dial again, and continue checking each blower speed until all speeds are checked.
3. Leave blower on speed 4.
If NG, go to trouble diagnosis procedure for MTC-57, "Front Blower Motor Circuit" .
If OK, continue with next check.
CHECKING DISCHARGE AIR
1.
Turn the mode switch to each position.
2. Confirm that discharge air comes out according to the air distribution table.
Mode door position is checked in the next step.
If NG, go to trouble diagnosis procedure for MTC-45, "Mode Door Motor Circuit" .
If OK, continue with next check.
NOTE:
Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at
fresh when the DEF (
) or D/F (
) is selected.
DISCHARGE AIR FLOW
Air outlet/distribution
Mode door position
Vent
Foot
Defroster
95%
5%
—
60%
40%
—
20%
55%
25%
15%
50%
35%
7%
15%
78%
Airflow always present at side demisters
CHECKING RECIRCULATION
1. Press recirculation (
) switch one time. Recirculation indicator should illuminate.
2. Press recirculation (
) switch one more time. Recirculation indicator should go off.
3. Listen for intake door position change (blower sound should change slightly).
If NG, go to trouble diagnosis procedure for MTC-53, "Intake Door Motor Circuit" .
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF or D/F is selected.
CHECKING TEMPERATURE DECREASE
1. Rotate temperature control dial counterclockwise.
2. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation if OK, go to trouble diagnosis procedure for MTC-70,
"Insufficient Cooling" . If air mix door motor appears to be malfunctioning, go to MTC-51, "DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)" .
If OK, continue with next check.
CHECKING TEMPERATURE INCREASE
1.
2.
Rotate temperature control dial clockwise.
Check for hot air at appropriate discharge air outlets.
Revision: February 2007
MTC-40
2006 Pathfinder
TROUBLE DIAGNOSIS
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for MTC-77,
"Insufficient Heating" . If air mix door motor (front) appears to be malfunctioning, go to MTC-51, "DIAGNOSTIC
PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)" .
If OK, continue with next check.
A
CHECK A/C SWITCH
B
1.
2.
Press A/C switch with the blower switch ON.
A/C switch indicator will turn ON.
● Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for MTC-65, "Magnet Clutch Circuit" .
If OK, continue with next check.
C
D
E
F
G
H
I
MTC
K
L
M
Revision: February 2007
MTC-41
2006 Pathfinder
TROUBLE DIAGNOSIS
Power Supply and Ground Circuit for Front Air Control
EJS004RM
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
WJIA1498E
*1
MTC-43, "DIAGNOSTIC PROCEDURE FOR A/C SYSTEM"
Revision: February 2007
*2
ATC-53, "Operational Check (Front)" *3
MTC-42
MTC-82, "FRONT AIR CONTROL"
2006 Pathfinder
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Front Air Control
A
The front air control has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor, mode door motor, intake door
motor, defroster door motor, blower motor and compressor are then
controlled.
The front air control is unitized with control mechanisms. When the
various switches and temperature dials are operated, data is input to
the front air control.
B
C
D
WJIA1302E
Potentio Temperature Control (PTC)
E
The PTC is built into the front air control. It can be set from cold to
hot or any intermediate position by rotating the temperature dial.
F
G
H
WJIA1311E
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
I
SYMPTOM: A/C system does not come on.
MTC
K
L
WJIA1461E
M
Revision: February 2007
MTC-43
2006 Pathfinder
TROUBLE DIAGNOSIS
1. CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL
1.
2.
3.
4.
Turn ignition switch OFF.
Disconnect front air control connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminals 6 and 19, and ground.
Terminals
Ignition switch position
(+)
Front air
control
connector
Terminal No.
(-)
OFF
ACC
ON
WJIA1082E
M49
6
M49
19
Ground
Approx. 0V
Approx. 0V
Battery
voltage
Battery
voltage
Battery
voltage
Battery
voltage
OK or NG
OK
>> GO TO 2.
NG
>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to PG-85 .
● If fuses are OK, check harness for open circuit. Repair or replace as necessary.
● If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as necessary.
2. CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL
1.
2.
Turn ignition switch OFF.
Check continuity between front air control harness connector
M49 terminal 20 and ground.
20 - Ground
: Continuity should exist.
OK or NG
OK
>> Replace front air control. Refer to ATC-127, "FRONT
AIR CONTROL" .
NG
>> Repair harness or connector.
WJIA1239E
Revision: February 2007
MTC-44
2006 Pathfinder
TROUBLE DIAGNOSIS
Mode Door Motor Circuit
EJS004RN
A
SYMPTOM:
●
Air outlet does not change.
●
Mode door motor does not operate normally.
B
INSPECTION FLOW
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1630E
*1
ATC-30, "Discharge Air Flow"
*2
ATC-53, "Operational Check
(Front)"
*4
MTC-31, "SYMPTOM TABLE"
*5
MTC-82, "FRONT AIR CONTROL"
*3
ATC-61, "DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR"
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●
Front air control
Revision: February 2007
MTC-45
2006 Pathfinder
TROUBLE DIAGNOSIS
●
●
●
Mode door motor
PBR (built into mode door motor)
Intake sensor
System Operation
The mode door position (vent, B/L, foot, D/F, and defrost) is set by the front air control by means of the mode
door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of
the mode door motor while ground is applied to the other circuit, causing the mode door motor to rotate. The
direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied
to it. The front air control monitors the mode door position by measuring the voltage signal on the PBR circuit.
WJIA1314E
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater and cooling unit
assembly. It rotates so that air is discharged from the outlet as indicated by the front air control. Motor rotation is conveyed to a link
which activates the mode door.
WJIA1484E
Revision: February 2007
MTC-46
2006 Pathfinder
TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
A
1. CHECK POWER SUPPLY AND GROUND CIRCUITS FOR MODE DOOR MOTOR
1.
2.
3.
Turn ignition switch OFF.
Disconnect front air control connector and mode door motor
connector.
Check continuity between front air control harness connector
M49 terminal 1 and mode door motor harness connector M142
terminal 1 and between front air control harness connector M49
terminal 14 and mode door motor harness connector M142 terminal 6.
1-1
: Continuity should exist.
14 - 6
: Continuity should exist.
B
C
D
WJIA1241E
E
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace harness as necessary.
F
2. CHECK PBR REFERENCE SIGNAL VOLTAGE
1.
2.
3.
Reconnect the front air control connector.
Turn ignition switch ON.
Check voltage between mode door motor harness connector
M142 terminal 3 and ground.
3 - Ground
G
H
: Approx. 5V
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
I
WJIA1242E
MTC
3. CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN MODE DOOR AND FRONT AIR CONTROL
1.
2.
3.
K
Turn ignition switch OFF.
Disconnect the front air control connector.
Check continuity between mode door motor harness connector
M142 terminal 3 and front air control harness connector M49 terminal 23.
3 - 23
: Continuity should exist.
OK or NG
OK
>> Replace front air control. Refer to ATC-127, "FRONT
AIR CONTROL" .
NG
>> Repair or replace harness as necessary.
Revision: February 2007
L
MTC-47
M
WJIA1085E
2006 Pathfinder
TROUBLE DIAGNOSIS
4. CHECK PBR GROUND REFERENCE CIRCUIT
1.
2.
3.
Turn ignition switch OFF.
Disconnect the front air control connector.
Check continuity between mode door motor harness connector
M142 terminal 2 and front air control harness connector M49 terminal 26.
2 - 26
: Continuity should exist.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace harness as necessary.
WJIA1087E
5. CHECK PBR FEEDBACK SIGNAL
1.
2.
3.
4.
Reconnect the front air control connector and mode door motor
connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 21 and ground.
Press mode switch through all modes.
21 - Ground
: Approx. 0 - 5V
OK or NG
OK
>> Replace front air control. Refer to ATC-127, "FRONT
AIR CONTROL" .
NG
>> GO TO 6.
WJIA1088E
6. CHECK PBR FEEDBACK CIRCUIT
1.
2.
3.
Turn ignition switch OFF.
Disconnect the mode door motor connector and front air control
harness connector.
Check continuity between mode door motor harness connector
M142 terminal 4 and front air control harness connector M49 terminal 21.
4 - 21
: Continuity should exist.
OK or NG
OK
>> Replace mode door motor. Refer to ATC-144, "MODE
DOOR MOTOR" .
NG
>> Repair or replace harness as necessary.
Revision: February 2007
MTC-48
WJIA1089E
2006 Pathfinder
TROUBLE DIAGNOSIS
Air Mix Door Motor Circuit
EJS004RO
A
SYMPTOM:
●
Discharge air temperature does not change.
●
Air mix door motor does not operate.
B
INSPECTION FLOW
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1500E
*1
MTC-40, "Operational Check"
Revision: February 2007
*2
MTC-51, "DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR
MOTOR (FRONT)"
MTC-49
*3
MTC-82, "FRONT AIR CONTROL"
2006 Pathfinder
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
●
Front air control
●
Air mix door motor (front)
●
PBR (built into air mix door motor)
●
Intake sensor
System Operation
The front air control receives data from the temperature selected by the driver. The front air control then
applies a voltage to one circuit of the air mix door motor, while ground is applied to the other circuit, causing
the air mix door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to
it, and which one has ground applied to it. The front air control monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.
WJIA1316E
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motors
WJIA0435E
The air mix door motor is attached to the front heater and cooling
unit assembly. This motor rotates so that the air mix door is opened
or closed to a position set by the front air control. Motor rotation is
then conveyed through a shaft and the air mix door position is then
fed back to the front air control by the PBR built into the air mix door
motor.
WJIA1485E
Revision: February 2007
MTC-50
2006 Pathfinder
TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)
A
1. CHECK POWER SUPPLY CIRCUITS FOR AIR MIX DOOR MOTOR
1.
2.
3.
Turn ignition switch OFF.
Disconnect front air control connector and air mix door motor
(front) connector.
Check continuity between front air control harness connector
M49 terminal 2 and 3 and air mix door motor (front) harness
connector M147 terminal 6 and 5.
2-6
: Continuity should exist.
3-5
: Continuity should exist.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace harness as necessary.
B
C
D
WJIA1318E
E
2. CHECK PBR REFERENCE SIGNAL VOLTAGE
1.
2.
3.
F
Reconnect the front air control connector.
Turn ignition switch ON.
Check voltage between air mix door motor (front) harness connector M147 terminal 1 and ground.
1 - Ground
G
: Approx. 5V
H
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
I
WJIA1319E
3. CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR MOTOR (FRONT) AND
MTC
FRONT AIR CONTROL
1.
2.
3.
Turn ignition switch OFF.
Disconnect the front air control connector.
Check continuity between air mix door motor (front) harness
connector M147 (B) terminal 1 and front air control harness connector M49 (A) terminal 23.
A
K
L
B
Connector
Terminal
Connector
Terminal
Continuity
Front air control:
M49
23
Air mix door motor
(front): M143
1
Yes
M
WJIA1656E
OK or NG
OK
>> Replace front air control. Refer to ATC-127, "FRONT AIR CONTROL" .
NG
>> Repair or replace harness as necessary.
Revision: February 2007
MTC-51
2006 Pathfinder
TROUBLE DIAGNOSIS
4. CHECK PBR GROUND REFERENCE CIRCUIT
1.
2.
3.
Turn ignition switch OFF.
Disconnect the front air control connector.
Check continuity between air mix door motor (front) harness
connector M147 terminal 3 and front air control harness connector M49 terminal 26.
3 - 26
: Continuity should exist.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace harness as necessary.
WJIA1320E
5. CHECK PBR FEEDBACK SIGNAL
1.
2.
3.
4.
Reconnect the front air control connector and air mix door motor
(front) connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 22 and ground.
Rotate temperature control dial through complete range.
22 - Ground
: Approx. 0V - 5V
OK or NG
OK
>> Replace front air control. Refer to ATC-127, "FRONT
AIR CONTROL" .
NG
>> GO TO 6.
WJIA1096E
6. CHECK PBR FEEDBACK CIRCUIT
1.
2.
3.
Turn ignition switch OFF.
Disconnect the air mix door motor (front) connector and front air
control connector.
Check continuity between air mix door motor (front) harness
connector M147 terminal 2 and front air control harness connector M49 terminal 22.
2 - 22
: Continuity should exist.
OK or NG
OK
>> Replace air mix door motor (front). Refer to MTC-92,
"AIR MIX DOOR MOTOR" .
NG
>> Repair or replace harness as necessary.
Revision: February 2007
MTC-52
WJIA1321E
2006 Pathfinder
TROUBLE DIAGNOSIS
Intake Door Motor Circuit
EJS004RP
A
SYMPTOM:
●
Intake door does not change.
●
Intake door motor does not operate normally.
B
INSPECTION FLOW
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1477E
*1
ATC-53, "Operational Check (Front)" *2
Revision: February 2007
MTC-82, "FRONT AIR CONTROL"
MTC-53
.
2006 Pathfinder
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
●
Front air control
●
Intake door motor
●
Intake sensor
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.
WJIA1478E
COMPONENT DESCRIPTION
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.
WJIA1486E
Revision: February 2007
MTC-54
2006 Pathfinder
TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
A
1. CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE
1.
2.
3.
4.
5.
Turn ignition switch OFF.
Disconnect intake door motor connector.
Turn ignition switch ON.
Rotate the temperature control dial counterclockwise.
Check voltage between intake door motor harness connector
M58 terminal 6 and ground.
6 - Ground
B
C
: Battery voltage
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
D
WJIA1324E
E
2. CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN
1.
2.
3.
F
Turn ignition switch OFF.
Disconnect front air control connector.
Check continuity between front air control harness connector
M49 terminal 5 and intake door motor harness connector M58
terminal 6.
5-6
G
: Continuity should exist.
OK or NG
OK
>> Replace front air control connector. Refer to MTC-82,
"CONTROL UNIT" .
NG
>> Repair or replace harness as necessary.
H
I
WJIA1468E
3. CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE
1.
2.
MTC
Rotate the temperature control dial clockwise.
Check voltage between intake door motor harness connector
M58 terminal 1 and ground.
1 - Ground
K
:Battery voltage
L
OK or NG
OK
>> Replace intake door motor. Refer to ATC-143, "INTAKE
DOOR MOTOR" .
NG
>> GO TO 4.
M
WJIA1326E
Revision: February 2007
MTC-55
2006 Pathfinder
TROUBLE DIAGNOSIS
4. CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN
1.
2.
3.
Turn ignition switch OFF.
Disconnect front air control connector.
Check continuity between front air control harness connector
M49 (A) terminal 4 and intake door motor harness connector
M58 (B) terminal 1.
A
B
Connector
Terminal
Connector
Terminal
Continuity
Front air control:
M49
4
Intake door motor:
M58
1
Yes
WJIA1684E
OK or NG
OK
>> Replace front air control connector. Refer to MTC-82, "CONTROL UNIT" .
NG
>> Repair or replace harness as necessary.
Revision: February 2007
MTC-56
2006 Pathfinder
TROUBLE DIAGNOSIS
Front Blower Motor Circuit
EJS004RQ
A
SYMPTOM:
●
Blower motor operation is malfunctioning.
INSPECTION FLOW
B
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1501E
*1
MTC-40, "Operational Check"
*2
MTC-59, "DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR"
*4
MTC-31, "SYMPTOM TABLE"
*5
MTC-82, "FRONT AIR CONTROL"
Revision: February 2007
MTC-57
*3
EC-207, "DTC P0117, P0118 ECT
SENSOR"
2006 Pathfinder
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
●
Front air control
●
Front blower motor resistor
●
Front blower motor
●
Front blower relay
System Operation
WJIA1502E
COMPONENT DESCRIPTION
Blower Motor Resistor
The front blower motor resistor is located on the heater and cooling
unit assembly. The front blower motor resistor grounds the front
blower motor through a series of 1, 2, or 3 resistors, depending upon
speed selected. For high speed operation the front blower motor
resistor is circumvented and the front blower motor grounds directly.
WJIA1487E
Revision: February 2007
MTC-58
2006 Pathfinder
TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
A
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
B
C
D
E
F
G
WJIA1503E
1. DIAGNOSTIC PROCEDURE
H
1.
2.
I
Turn ignition switch ON.
Turn the front blower switch to each of its four speeds.
Does blower motor rotate normally at each speed?
YES or NO
YES >> Inspection End.
NO
>> 1. Does not rotate at any speed, GO TO 2.
2. Does not rotate at 1 - 3 speed, GO TO 13.
3. Does not rotate at 4 speed, GO TO 16.
MTC
K
2. CHECK FUSES
Check 15A fuses (Nos. 24 and 27, located in the fuse and fusible link box). Refer to PG-86, "FUSE AND
FUSIBLE LINK BOX" .
2. Check 10A fuse [No. 8, located in the fuse block (JB)]. Refer to PG-85, "FUSE BLOCK-JUNCTION BOX
(J/B)" .
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 8.
1.
Revision: February 2007
MTC-59
2006 Pathfinder
L
M
TROUBLE DIAGNOSIS
3. CHECK FRONT BLOWER MOTOR POWER SUPPLY
1.
2.
3.
4.
5.
Turn ignition switch OFF.
Disconnect front blower motor harness connector.
Turn ignition switch ON.
Select any front blower speed except OFF.
Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
2 - Ground
: Battery voltage
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 4.
WJIA1331E
4. CHECK FRONT BLOWER MOTOR RELAY
1. Turn Ignition switch OFF.
2. Check front blower motor relay. Refer to MTC-63, "Front Blower Motor Relay" .
OK or NG
OK
>> GO TO 5.
NG
>> Replace front blower motor relay.
5. CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (SWITCH SIDE)
Check voltage between front blower motor relay harness connector
E54 terminals 7 and 5 and ground.
A
(+)
Front air control
connector
Terminal
M54
5
M54
Voltage
(Approx.)
Condition
7
(-)
Ground
Blower motor
relay power
supply
Ground
Blower motor
relay power
supply
Battery voltage
WJIA1634E
Battery voltage
OK or NG
OK
>> GO TO 6.
NG
>> Repair harness or connector.
Revision: February 2007
MTC-60
2006 Pathfinder
TROUBLE DIAGNOSIS
6. CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (COIL SIDE)
1.
2.
A
Turn ignition switch ON.
Check voltage between front blower motor relay harness connector E54 terminal 1 and ground.
A
(+)
Front air control
connector
M54
Condition
Terminal
1
B
Voltage
(Approx.)
C
(-)
Ground
Blower motor
relay power
supply (coil
side)
D
Battery voltage
WJIA0504E
E
OK or NG
OK
>> GO TO 7.
NG
>> Repair or replace harness as necessary.
F
7. CHECK FRONT BLOWER MOTOR POWER FROM RELAY TO FRONT BLOWER MOTOR
1.
2.
Turn ignition switch OFF.
Check continuity between front blower motor relay harness connector E54 terminals 6 and 3 and front blower motor harness
connector M62 terminal 2.
3, 6 - 2
G
H
: Continuity should exist.
OK or NG
OK
>> Repair or replace harness as necessary.
NG
>> Repair harness or connector between the front blower
motor relay and the front blower motor.
I
WJIA1333E
MTC
8. REPLACE FUSE
K
Refer to PG-86, "FUSE AND FUSIBLE LINK BOX" .
Does fuse No. 24 or 27 open when the front blower motor is turned on?
YES or NO
YES >> GO TO 10.
NO
>> GO TO 9.
L
9. REPLACE FUSE
M
Refer to PG-85, "FUSE BLOCK-JUNCTION BOX (J/B)" .
Does fuse No. 8 open when the ignition switch is turned ON?
YES or NO
YES >> Repair or replace harness as necessary.
NO
>> Inspection End.
Revision: February 2007
MTC-61
2006 Pathfinder
TROUBLE DIAGNOSIS
10. CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1.
2.
3.
Turn ignition switch OFF.
Disconnect front blower motor connector.
Check continuity between front blower motor harness connector
M62 terminal 2 and ground.
2 - Ground
: Continuity should not exist.
OK or NG
OK
>> GO TO 11.
NG
>> Repair or replace harness as necessary.
WJIA0649E
11. CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT FOR SHORT
1.
2.
Disconnect front blower motor relay connector.
Check continuity between the front blower motor relay harness
connector E54 terminal 7 and terminal 5 and ground.
7, 5 - Ground
: Continuity should not exist.
OK or NG
OK
>> Check front blower motor. Refer to MTC-64, "Front
Blower Motor" .
NG
>> Repair harness or connector.
WJIA1334E
12. CHECK FRONT BLOWER MOTOR
1. Turn ignition switch OFF.
2. Check front blower motor. Refer to MTC-64, "Front Blower Motor" .
OK or NG
OK
>> GO TO 13.
NG
>> Replace front blower motor. Refer to MTC-84, "BLOWER MOTOR" .
13. CHECK FRONT BLOWER MOTOR RESISTOR
Check front blower motor resistor. Refer to MTC-58, "Blower Motor Resistor" .
OK or NG
OK
>> GO TO 14.
NG
>> Replace front blower motor resistor. Refer to MTC-93, "Removal and Installation" .
14. CHECK FRONT BLOWER SWITCH
Check front blower switch. Refer to MTC-64, "Front Blower Switch" .
OK or NG
OK
>> GO TO 15.
NG
>> Replace front blower switch. Refer to MTC-82, "FRONT AIR CONTROL" .
Revision: February 2007
MTC-62
2006 Pathfinder
TROUBLE DIAGNOSIS
15. CHECK FRONT BLOWER MOTOR GROUND CIRCUIT TO FRONT BLOWER MOTOR RESISTOR
1.
2.
Disconnect front blower motor resistor harness connector.
Check continuity between front blower motor connector M62 (A)
terminal 1 and front blower motor resistor harness connector
M122 (B) terminal 3.
A
B
B
Connector
Terminal
Connector
Terminal
Continuity
Front blower motor:
M62
1
Front blower
motor resistor:
M122
3
Yes
A
C
D
WJIA1676E
OK or NG
OK
>> Repair harness or connector between front blower switch connector M51 terminal 8 and ground.
NG
>> Repair harness or connector between front blower motor resistor and front blower motor.
16. CHECK FRONT BLOWER SWITCH
E
F
Check front blower switch. Refer to MTC-64, "Front Blower Switch" .
OK or NG
OK
>> Repair harness or connector between front blower motor switch connector M51 terminal 8 and
front blower motor resistor connector M122 terminal 3.
NG
>> Replace front blower switch. Refer to MTC-82, "FRONT AIR CONTROL" .
G
H
COMPONENT INSPECTION
Front Blower Motor Relay
I
Check continuity between terminals by supplying 12 volts and
ground to coil side terminals of relay.
MTC
K
L
M
LJIA0068E
Revision: February 2007
MTC-63
2006 Pathfinder
TROUBLE DIAGNOSIS
Front Blower Motor
Confirm smooth rotation of the blower motor.
●
Ensure that there are no foreign particles inside the blower unit.
●
Apply 12 volts to terminal 2 and ground to terminal 1 and verify
that the motor operates freely and quietly.
WJIA1508E
Front Blower Switch
Check continuity between terminals at each switch position.
WJIA0508E
Revision: February 2007
MTC-64
2006 Pathfinder
TROUBLE DIAGNOSIS
Magnet Clutch Circuit
EJS004RR
A
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
B
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1677E
*1
.ATC-53, "Operational Check
(Front)"
Revision: February 2007
*2
ATC-125, "Intake Sensor Circuit"
MTC-65
*3
MTC-82, "FRONT AIR CONTROL"
2006 Pathfinder
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
The front air control controls compressor operation based on ambient and intake temperature and a signal
from ECM.
Low Temperature Protection Control
The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sensor and the ambient sensor.
When intake air temperature is higher than 3.5° C (38.3° F), the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than 2.5° C (36.5° F).
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
WJIA1490E
1. PERFORM AUTO ACTIVE TEST
Refer to PG-24, "Auto Active Test" .
Does magnet clutch operate?
YES or NO
YES >> ●
WITH CONSULT-II
GO TO 2.
WITHOUT CONSULT-II
GO TO 8.
>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 12.
●
NO
2. CHECK BCM INPUT (A/C COMPRESSOR ON) SIGNAL
Check A/C compressor ON/OFF signal. Refer to MTC-29, "CONSULT-II Function (BCM)" .
A/C SW ON
: COMP ON SIG ON
A/C SW OFF
: COMP ON SIG OFF
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 8.
WJIA0469E
Revision: February 2007
MTC-66
2006 Pathfinder
TROUBLE DIAGNOSIS
3. CHECK REFRIGERANT PRESSURE SENSOR
A
Check refrigerant pressure sensor. Refer to EC-659, "REFRIGERANT PRESSURE SENSOR" .
OK or NG
OK
>> GO TO 4.
NG
>> Replace refrigerant pressure sensor. Refer to EC-663, "Removal and Installation" .
B
4. CHECK BCM INPUT (FAN ON) SIGNAL
C
Check FAN ON/OFF signal. Refer to MTC-29, "CONSULT-II Function (BCM)" .
BLOWER CONTROL DIAL
ON
: FAN ON SIG ON
BLOWER CONTROL DIAL
OFF
: FAN ON SIG OFF
D
E
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 5.
F
WJIA0469E
5. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
G
1.
2.
3.
H
Turn ignition switch OFF.
Disconnect BCM connector and front air control connector.
Check continuity between BCM harness connector M18 (A) terminal 28 and front air control harness connector M49 (B) terminal 18.
A
Connector
BCM: M18
I
B
Terminal
Connector
Terminal
Continuity
28
Front air control:
M49
18
Yes
MTC
WJIA1627E
OK or NG
OK
>> GO TO 6.
NG
>> Repair harness or connector.
K
L
M
Revision: February 2007
MTC-67
2006 Pathfinder
TROUBLE DIAGNOSIS
6. CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)
1.
2.
3.
4.
Reconnect BCM connector and front air control connector.
Turn ignition switch ON.
Turn A/C switch ON.
Check voltage between front air control harness connector M49
terminal 18 and ground.
Terminals
(+)
Front air control connector
(-)
Voltage
(Approx.)
Condition
Terminal No.
WJIA1628E
M49
18
Ground
A/C switch: ON
Blower motor
operates
0V
A/C switch: OFF
5V
OK or NG
OK
>> Replace BCM. Refer to BCS-27, "Removal and Installation" .
NG-1 >> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to MTC-82,
"CONTROL UNIT" .
NG-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to BCS-27, "Removal
and Installation" .
7. CHECK CAN COMMUNICATION
Check CAN communication. Refer to LAN-25, "CAN COMMUNICATION" .
OK or NG
OK
>> Inspection End.
NG
>> Repair or replace malfunctioning part(s).
8. CHECK VOLTAGE FOR FRONT AIR CONTROL (A/C COMPRESSOR ON SIGNAL)
1.
2.
3.
Reconnect BCM connector and front air control connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 10 and ground.
Terminals
(+)
Front air
control connector
M49
(-)
Condition
Voltage
(Approx.)
A/C switch: ON
0V
A/C switch:
OFF
Battery voltage
Terminal No.
WJIA1137E
10
Ground
OK or NG
OK
>> GO TO 9.
NG-1 >> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to MTC-82,
"CONTROL UNIT" .
NG-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to BCS-27, "Removal
and Installation" .
Revision: February 2007
MTC-68
2006 Pathfinder
TROUBLE DIAGNOSIS
9. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1.
2.
A
Disconnect BCM connector and front air control connector.
Check continuity between BCM harness connector M18 terminal
27 and front air control harness connector M49 terminal 10.
27 - 10
B
: Continuity should exist.
OK or NG
OK
>> GO TO 10.
NG
>> Repair harness or connector.
C
D
WJIA1136E
10. CHECK INTAKE SENSOR CIRCUITS
E
Check intake sensor. Refer to MTC-80, "Intake Sensor Circuit" .
OK or NG
OK
>> GO TO 11.
NG
>> Replace intake sensor. Refer to MTC-83, "INTAKE SENSOR" .
F
11. CHECK CAN COMMUNICATION
G
Check CAN communication. Refer to LAN-25, "CAN COMMUNICATION" .
OK or NG
OK
>> Replace BCM. Refer to BCS-27, "Removal and Installation" .
NG
>> Repair or replace malfunctioning part(s).
H
I
12. CHECK MAGNET CLUTCH CIRCUIT
Check for operation sound when applying battery voltage to terminal.
OK or NG
OK
>> GO TO 13.
NG
>> Replace magnet clutch. Refer to MTC-102, "Removal
and Installation for Compressor Clutch" .
MTC
K
L
WJIA1472E
13. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND A/C COMPRESSOR
1.
2.
3.
Turn ignition switch OFF.
Disconnect IPDM E/R connector and A/C compressor (magnet
clutch) connector.
Check continuity between IPDM E/R harness connector E119
terminal 11 and A/C compressor harness connector F3 terminal
1.
11 – 1
: Continuity should exist.
OK or NG
OK
>> Replace IPDM E/R. Refer to PG-34, "Removal and
Installation of IPDM E/R" .
NG
>> Repair harness or connector.
Revision: February 2007
MTC-69
WJIA1470E
2006 Pathfinder
M
TROUBLE DIAGNOSIS
Insufficient Cooling
EJS004RS
SYMPTOM: Insufficient cooling
INSPECTION FLOW
WJIA1340E
*1
ATC-53, "Operational Check
(Front)"
*2
EC-493, "SYSTEM DESCRIPTION"
*3
ATC-5, "Contaminated Refrigerant"
*4
ATC-103, "PERFORMANCE TEST
DIAGNOSES"
*5
ATC-105, "Test Reading"
*6
MA-13, "Checking Drive Belts"
Revision: February 2007
MTC-70
2006 Pathfinder
TROUBLE DIAGNOSIS
PERFORMANCE TEST DIAGNOSES
A
B
C
D
E
F
G
H
I
MTC
K
L
M
RJIA1601E
*1
ATC-105, "PERFORMANCE
CHART"
*4
ATC-63, "Air Mix Door Motor Circuit"
Revision: February 2007
*2
MTC-73, "Test Reading"
MTC-71
*3
ATC-106, "Trouble Diagnoses for
Unusual Pressure"
2006 Pathfinder
TROUBLE DIAGNOSIS
RJIA3107E
*1
ATC-159, "Removal and Installation
for Compressor Clutch"
Revision: February 2007
*2
ATC-75, "Front Blower Motor Circuit" *3
MTC-72
MA-13, "Checking Drive Belts"
2006 Pathfinder
TROUBLE DIAGNOSIS
PERFORMANCE CHART
Test Condition
A
Testing must be performed as follows:
Vehicle location
Indoors or in the shade (in a well-ventilated place)
Doors
Closed
Door window
Open
Hood
Open
TEMP.
Max. COLD
Mode switch
B
C
(Ventilation) set
Recirculation (REC) switch
D
(Recirculation) set
Max. speed set
Blower speed
Engine speed
E
Idle speed
Operate the air conditioning system for 10 minutes before taking measurements.
Test Reading
F
Recirculating-to-discharge Air Temperature Table
Inside air (Recirculating air) at blower assembly inlet
Relative humidity
%
Discharge air temperature at center ventilator
°C (°F)
Air temperature
°C (°F)
20 (68)
5.3 - 6.5 (42 - 44)
25 (77)
9.7 - 11.5 (49 - 53)
30 (86)
13.8 - 16.3 (57 - 61)
35 (95)
18.0 - 21.2 (64 - 70)
40 (104)
22.2 - 25.7 (72 - 78)
50 - 60
20 (68)
6.5 - 7.7 (44 - 46)
25 (77)
11.5 - 13.3 (53 - 56)
30 (86)
16.3 - 18.8 (61 - 66)
35 (95)
21.2 - 24.0 (70 - 75)
40 (104)
25.7 - 29.2 (78 - 85)
60 - 70
H
I
MTC
K
Ambient Air Temperature-to-operating Pressure Table
Ambient air
Relative humidity
%
50 - 70
Revision: February 2007
G
L
High-pressure (Discharge side)
Low-pressure (Suction side)
Air temperature
°C (°F)
kPa (kg/cm2 , psi)
kPa (kg/cm2 , psi)
20 (68)
680 - 840
(6.94 - 8.57, 98.6 - 121.8)
160 - 198
(1.63 - 2.02, 23.2 - 28.7)
25 (77)
800 - 985
(8.16 - 10.05, 116.0 - 142.8)
198 - 245
(2.02 - 2.50, 28.7 - 35.5)
30 (86)
940 - 1,150
(9.59 - 11.73, 136.3 - 166.8)
225 - 278
(2.30 - 2.84, 32.6 - 40.3)
35 (95)
1,160 - 1,410
(11.83 - 14.38, 168.2 - 204.5)
273 - 335
(2.78 - 3.42, 39.6 - 48.6)
40 (104)
1,325 - 1,620
(13.52 - 16.52, 192.1 - 234.9)
325 - 398
(3.32 - 4.06, 47.1 - 57.7)
M
MTC-73
2006 Pathfinder
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSES FOR UNUSUAL PRESSURE
Whenever system′s high and/or low side pressure is unusual, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperatureto-operating pressure table).
Both High- and Low-pressure Sides are Too High
Gauge indication
Refrigerant cycle
Pressure is reduced soon
after water is splashed on
condenser.
Air suction by cooling fan is
insufficient.
Probable cause
Excessive refrigerant charge
in refrigeration cycle
Insufficient condenser cooling
performance
↓
1. Condenser fins are clogged.
Corrective action
Reduce refrigerant until specified pressure is obtained.
●
Clean condenser.
●
Check and repair cooling fan
if necessary.
2. Improper fan rotation of
cooling fan
Both high- and low-pressure sides
are too high.
●
Low-pressure pipe is not
cold.
●
When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa (2
kg/cm2 , 28 psi). It then
decreases gradually thereafter.
AC359A
Engine tends to overheat.
●
●
An area of the low-pressure pipe is colder than
areas near the evaporator
outlet.
Plates are sometimes covered with frost.
Poor heat exchange in condenser
(After compressor operation
stops, high-pressure
decreases too slowly.)
↓
Air in refrigeration cycle
Evacuate and recharge system.
Engine cooling systems malfunction.
Check and repair engine cooling system.
●
Excessive liquid refrigerant
on low-pressure side
●
Excessive refrigerant discharge flow
●
Expansion valve is open a
little compared with the
specification.
Replace expansion valve.
↓
Improper expansion valve
adjustment
High-pressure Side is Too High and Low-pressure Side is Too Low
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
High-pressure side is too high and
low-pressure side is too low.
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.
High-pressure tube or parts
located between compressor
and condenser are clogged or
crushed.
●
Check and repair or replace
malfunctioning parts.
●
Check oil for contamination.
AC360A
Revision: February 2007
MTC-74
2006 Pathfinder
TROUBLE DIAGNOSIS
High-pressure Side is Too Low and Low-pressure Side is Too High
Gauge indication
High-pressure side is too low and
low-pressure side is too high.
Refrigerant cycle
Probable cause
High- and low-pressure sides
become equal soon after compressor operation stops.
Compressor pressure operation is improper.
↓
Damaged inside compressor
packings.
No temperature difference
between high- and low-pressure sides.
Compressor pressure operation is improper.
↓
Damaged inside compressor
packings.
AC356A
Corrective action
Replace compressor.
A
B
C
Replace compressor.
D
Both High- and Low-pressure Sides are Too Low
Gauge indication
Refrigerant cycle
●
●
●
Both high- and low-pressure sides
are too low.
AC353A
There is a big temperature
difference between liquid
tank outlet and inlet. Outlet
temperature is extremely
low.
Probable cause
Liquid tank inside is slightly
clogged.
Corrective action
●
Replace liquid tank.
●
Check oil for contamination.
Liquid tank inlet and expansion valve are frosted.
Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.
●
Expansion valve inlet may
be frosted.
●
Temperature difference
occurs somewhere in highpressure side.
Expansion valve and liquid
tank are warm or only cool
when touched.
There is a big temperature difference between expansion
valve inlet and outlet while the
valve itself is frosted.
Air flow volume is too low.
Revision: February 2007
F
G
High-pressure pipe located
between liquid tank and
expansion valve is clogged.
Low refrigerant charge.
↓
Leaking fittings or components.
Expansion valve closes a little
compared with the specification.
↓
1. Improper expansion valve
adjustment.
2. Malfunctioning expansion
valve.
●
Check and repair malfunctioning parts.
●
Check oil for contamination.
Check refrigerant system for
leaks. Refer to ATC-170,
"Checking for Refrigerant
Leaks" .
●
Remove foreign particles by
using compressed air.
●
Check oil for contamination.
●
Check and repair malfunctioning parts.
●
Check oil for contamination.
●
Check intake sensor circuit.
Refer to ATC-125, "Intake
Sensor Circuit" .
●
Replace compressor.
●
Repair evaporator fins.
●
Replace evaporator.
●
Refer to ATC-75, "Front
Blower Motor Circuit" .
3. Outlet and inlet may be
clogged.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.
E
Low-pressure pipe is clogged
or crushed.
Evaporator is frozen.
MTC-75
2006 Pathfinder
H
I
MTC
K
L
M
TROUBLE DIAGNOSIS
Low-pressure Side Sometimes Becomes Negative
Gauge indication
Low-pressure side sometimes
becomes negative.
Refrigerant cycle
●
●
Air conditioning system
does not function and does
not cyclically cool the compartment air.
The system constantly functions for a certain period of
time after compressor is
stopped and restarted.
Probable cause
Refrigerant does not discharge cyclically.
↓
Moisture is frozen at expansion valve outlet and inlet.
↓
Water is mixed with refrigerant.
Corrective action
●
Drain water from refrigerant
or replace refrigerant.
●
Replace liquid tank.
AC354A
Low-pressure Side Becomes Negative
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Leave the system at rest until
no frost is present. Start it
again to check whether or not
the malfunction is caused by
water or foreign particles.
●
If water is the cause, initially
cooling is okay. Then the
water freezes causing a
blockage. Drain water from
refrigerant or replace refrigerant.
●
If due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed air
(not shop air).
●
If either of the above methods cannot correct the malfunction, replace expansion
valve.
●
Replace liquid tank.
●
Check oil for contamination.
Low-pressure side becomes negative.
Liquid tank or front/rear side of
expansion valve′s pipe is
frosted or dewed.
High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid tank
is frosted.
AC362A
Revision: February 2007
MTC-76
2006 Pathfinder
TROUBLE DIAGNOSIS
Insufficient Heating
EJS004RT
A
SYMPTOM: Insufficient heating
INSPECTION FLOW
B
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1983E
*1
ATC-53, "Operational Check (Front)"
*2
ATC-63, "Air Mix Door Motor Circuit" *3
EC-207, "DTC P0117, P0118 ECT
SENSOR"
*4
MA-13, "Changing Engine Coolant"
*5
CO-10, "CHECKING RESERVOIR
CAP"
CO-10, "Changing Engine Coolant"
*7
MTC-89, "HEATER CORE"
Revision: February 2007
MTC-77
*6
2006 Pathfinder
TROUBLE DIAGNOSIS
Noise
EJS004RU
SYMPTOM: Noise
INSPECTION FLOW
WJIA1972E
Revision: February 2007
MTC-78
2006 Pathfinder
TROUBLE DIAGNOSIS
*1
ATC-159, "REMOVAL"
*2
*4
ATC-53, "Operational Check (Front)" *5
ATC-160, "INSTALLATION"
*3
ATC-22, "Maintenance of Oil Quantity in Compressor"
A
MA-13, "Checking Drive Belts"
B
C
D
E
F
G
H
I
MTC
K
L
M
Revision: February 2007
MTC-79
2006 Pathfinder
TROUBLE DIAGNOSIS
Intake Sensor Circuit
EJS004RV
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on top of the heater and cooling unit
assembly next to the A/C evaporator cover. It converts temperature
of air after it passes through the evaporator into a resistance value
which is then input to the front air control.
WJIA1155E
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted.
WJIA1156E
1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1.
2.
3.
Disconnect intake sensor connector.
Turn ignition switch ON.
Check voltage between intake sensor harness connector M146
terminal 2 and ground.
2 - Ground
: Approx. 5V
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
WJIA1278E
2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1.
2.
3.
Turn ignition switch OFF.
Disconnect front air control connector.
Check continuity between intake sensor harness connector
M146 terminal 1 and front air control harness connector M49 terminal 13.
1 - 13
: Continuity should exist.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
Revision: February 2007
WJIA1157E
MTC-80
2006 Pathfinder
TROUBLE DIAGNOSIS
3. CHECK INTAKE SENSOR
A
Refer to ATC-126, "Intake Sensor" .
OK or NG
OK
>> Replace front air control. Refer to MTC-82, "FRONT AIR CONTROL" .
NG
>> Replace intake sensor. Refer to MTC-83, "INTAKE SENSOR" .
B
4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1.
2.
3.
Turn ignition switch OFF.
Disconnect front air control connector.
Check continuity between intake sensor harness connector
M146 terminal 2 and front air control harness connector M49 terminal 12.
2 - 12
4.
C
D
E
: Continuity should exist.
Check continuity between intake sensor harness connector
M146 terminal 2 and ground.
2 - Ground
: Continuity should not exist.
F
WJIA1158E
OK or NG
OK
>> Replace front air control. Refer to MTC-82, "FRONT AIR CONTROL" .
NG
>> Repair harness or connector.
G
COMPONENT INSPECTION
Intake Sensor
H
After disconnecting intake sensor connector, measure resistance
between terminals 1 and 2 at sensor harness side, using the table
below.
Temperature °C (°F)
Resistance kΩ
−15 (5)
209.0
−10 (14)
160.0
−5 (23)
123.0
0 (32)
95.8
5 (41)
74.9
10 (50)
58.9
15 (59)
46.7
20 (68)
37.3
25 (77)
30.0
30 (86)
24.2
35 (95)
19.7
40 (104)
16.1
45 (113)
13.2
MTC
K
L
M
WJIA1159E
If NG, replace intake sensor.
Revision: February 2007
I
MTC-81
2006 Pathfinder
CONTROL UNIT
CONTROL UNIT
Removal and Installation
PFP:27500
EJS004RW
FRONT AIR CONTROL
Removal
1.
2.
3.
Remove cluster lid C. Refer to IP-11, "CLUSTER LID C -WITHOUT NAVIGATION SYSTEM" .
Remove the four screws securing the front air control to cluster
lid C.
Remove the front air control.
LBIA0416E
Installation
Installation is in the reverse order of removal.
Revision: February 2007
MTC-82
2006 Pathfinder
INTAKE SENSOR
INTAKE SENSOR
Removal and Installation
PFP:27723
A
EJS004RX
REMOVAL
1.
2.
3.
4.
5.
6.
7.
8.
9.
Remove the front kick plate. Refer to EI-28, "KICK PLATES" .
Remove the lower dash side finisher. Refer to EI-28, "LOWER DASH SIDE FINISHER" .
Remove the front pillar lower finisher. Refer to EI-28, "FRONT PILLAR LOWER FINISHER" .
Remove the assist grip handle
Remove the front pillar upper finisher. Refer to EI-28, "FRONT PILLAR UPPER FINISHER" .
Remove the lower glove box. Refer to IP-15, "LOWER INSTRUMENT PANEL RH AND LOWER GLOVE
BOX" .
Remove the upper glove box (cluster lid E). Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY" .
Disconnect the intake sensor electrical connector.
NOTE:
The intake sensor is located on the top of the heater and cooling
unit assembly next to the A/C evaporator cover.
Twist the intake sensor to remove the intake sensor from the
heater and cooling unit assembly.
B
C
D
E
F
G
WJIA1415E
H
INSTALLATION
Installation is in the reverse order of removal.
I
MTC
K
L
M
Revision: February 2007
MTC-83
2006 Pathfinder
BLOWER MOTOR
BLOWER MOTOR
Components
PFP:27226
EJS004RY
Blower Motor
LJIA0136E
1.
Heater and cooling unit assembly
2.
Blower motor
Removal and Installation
3.
Blower motor resistor
EJS004RZ
REMOVAL
1.
2.
3.
Remove the lower glove box assembly. Refer to IP-15, "LOWER INSTRUMENT PANEL RH AND LOWER
GLOVE BOX" .
Disconnect the blower motor electrical connector.
Remove the three screws and remove the blower motor.
INSTALLATION
Installation is in the reverse order of removal.
Revision: February 2007
MTC-84
2006 Pathfinder
IN-CABIN MICROFILTER
IN-CABIN MICROFILTER
Removal and Installation
PFP:27277
A
EJS004S0
FUNCTION
The air inside the passenger compartment is filtered by the in-cabin
microfilters when the heater or A/C controls are set on either the
recirculation or fresh mode. The two in-cabin microfilters are located
in the heater and cooling unit assembly.
B
C
D
LJIA0012E
E
REPLACEMENT TIMING
Replacement of the two in-cabin microfilters is recommended on a regular interval depending on the driving
conditions. Refer to MA-7, "PERIODIC MAINTENANCE" . It may also be necessary to replace the two in-cabin
microfilters as part of a component replacement if the in-cabin microfilters are damaged.
F
REPLACEMENT PROCEDURE
1.
G
Open the lower glove box and press in on the sides so that it will
open completely allowing it to hang by the cord.
H
I
MTC
WLIA0023E
2.
3.
Remove the screw and remove the in-cabin microfilter cover.
Remove the in-cabin microfilters from the heater and cooling
unit housing.
K
L
M
LJIA0134E
4.
Insert the first new in-cabin microfilter into the heater and cooling unit housing and slide it over to the right. Insert the second
new in-cabin microfilter into the heater and cooling unit housing.
NOTE:
The in-cabin microfilters are marked with air flow arrows. The
end of the microfilter with the arrow should face the rear of the
vehicle. The arrows should point downward.
LJIA0148E
Revision: February 2007
MTC-85
2006 Pathfinder
IN-CABIN MICROFILTER
5.
Install the in-cabin microfilter cover.
LJIA0134E
6.
Close the lower glove box completely.
Revision: February 2007
MTC-86
2006 Pathfinder
HEATER & COOLING UNIT ASSEMBLY
HEATER & COOLING UNIT ASSEMBLY
Components
PFP:27110
A
EJS004S1
Heater and Cooling Unit Assembly
B
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1416E
1.
High-pressure A/C pipe
2.
Low-pressure A/C pipe
3.
Expansion valve
4.
Heater core and evaporator pipes
grommet
5.
A/C drain hose grommet
6.
A/C drain hose
7.
Heater core pipe mounts
8.
Heater core pipes
9.
Heater and cooling unit assembly
Removal and Installation
EJS004S2
REMOVAL
1.
2.
3.
Discharge the refrigerant from the A/C system. Refer to ATC-154, "Discharging Refrigerant" .
Drain the coolant from the engine cooling system. Refer to MA-13, "DRAINING ENGINE COOLANT" .
Disconnect the battery negative and positive terminals.
Revision: February 2007
MTC-87
2006 Pathfinder
HEATER & COOLING UNIT ASSEMBLY
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Remove the RH heater core pipes nut.
Disconnect the heater core hoses from the heater core.
Disconnect the high- and low-pressure A/C pipes from the
expansion valve.
Move the two front seats to the rearmost position on the seat
track.
Remove the instrument panel and console panel. Refer to IP-10,
"Removal and Installation" .
Remove the two front floor ducts.
WJIA1292E
Remove the steering column. Refer to PS-10, "Removal and
Installation" .
Disconnect the instrument panel wire harness at the RH and LH in-line connector brackets, and the fuse
block (SMJ) electrical connectors. Refer to PG-45, "Harness Layout" .
Remove the covers then remove the three steering member bolts from each side to disconnect the steering member from the vehicle body.
Remove the heater and cooling unit assembly with it attached to the steering member, from the vehicle.
CAUTION:
● Use care not to damage the seats and interior trim panels when removing the heater and cooling
unit assembly with it attached to the steering member.
● Use suitable plugs on the heater core pipes to prevent coolant leakage.
Remove the heater and cooling unit assembly from the steering member.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
●
Replace the O-ring of the low-pressure A/C pipe and high-pressure A/C pipe with a new one, and
apply compressor oil to the O-ring for installation. Refer to MTC-100, "Components" .
●
After charging the refrigerant, check for leaks. Refer to ATC-170, "Checking for Refrigerant Leaks"
.
NOTE:
●
Fill the engine cooling system with the specified coolant mixture. Refer to MA-14, "REFILLING ENGINE
COOLANT" .
●
Recharge the A/C system. Refer to ATC-154, "Evacuating System and Charging Refrigerant" .
Revision: February 2007
MTC-88
2006 Pathfinder
HEATER CORE
HEATER CORE
Components
PFP:27140
A
EJS004S3
Heater and Cooling Unit Assembly
B
C
D
E
F
G
H
I
LJIA0167E
1.
Heater core and evaporator pipe bracket 2.
4.
Heater core cover
Heater core
3.
MTC
Heater and cooling unit assembly
K
Removal and Installation
EJS004S4
REMOVAL
1.
2.
3.
4.
Remove the heater and cooling unit assembly. Refer to MTC-87, "HEATER & COOLING UNIT ASSEMBLY" .
Remove the three screws and remove the heater core cover.
Remove the heater core and evaporator pipe bracket.
Remove the heater core.
NOTE:
If the in-cabin microfilters are contaminated from coolant leaking
from the heater core, replace the in-cabin microfilters with new
ones before installing the new heater core.
LJIA0134E
INSTALLATION
Installation is in the reverse order of removal.
Revision: February 2007
MTC-89
2006 Pathfinder
L
M
INTAKE DOOR MOTOR
INTAKE DOOR MOTOR
Removal and Installation
PFP:27730
EJS004S5
Intake Door Motor - Heater and Cooling Unit Assembly
WJIA1312E
1.
Heater and cooling unit assembly
2.
Intake door motor
4.
Blower motor resistor
5.
Mode door motor
3.
Air mix door motor
REMOVAL
1.
2.
3.
4.
Remove the heater and cooling unit assembly. Refer to MTC-87, "HEATER & COOLING UNIT ASSEMBLY" .
Remove the steering member from the heater and cooling unit assembly.
Disconnect the intake door motor electrical connector.
Remove the three screws and remove the intake door motor.
INSTALLATION
Installation is in the reverse order of removal.
Revision: February 2007
MTC-90
2006 Pathfinder
MODE DOOR MOTOR
MODE DOOR MOTOR
Removal and Installation
PFP:27731
A
EJS004S6
Mode Door Motor - Heater and Cooling Unit Assembly
B
C
D
E
F
G
H
I
WJIA1312E
1.
Heater and cooling unit assembly
2.
Intake door motor
4.
Blower motor resistor
5.
Mode door motor
3.
MTC
Air mix door motor
REMOVAL
K
1.
2.
3.
4.
L
Remove the instrument panel side finisher. Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY" .
Remove the lower instrument cover. Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY" .
Disconnect the mode door motor electrical connector.
Remove the three screws and remove the mode door motor.
INSTALLATION
M
Installation is in the reverse order of removal.
Revision: February 2007
MTC-91
2006 Pathfinder
AIR MIX DOOR MOTOR
AIR MIX DOOR MOTOR
Components
PFP:27732
EJS004S7
Air Mix Door Motor - Heater and Cooling Unit Assembly
WJIA1312E
1.
Heater and cooling unit assembly
2.
Intake door motor
4.
Blower motor resistor
5.
Mode door motor
Removal and Installation
3.
Air mix door motor
EJS004S8
REMOVAL
1.
2.
3.
4.
Remove the heater and cooling unit assembly. Refer to MTC-87, "HEATER & COOLING UNIT ASSEMBLY" .
Remove the steering member from the heater and cooling unit assembly.
Disconnect the air mix door motor electrical connector.
Remove the three screws and remove the air mix door motor.
INSTALLATION
Installation is in the reverse order of removal.
Revision: February 2007
MTC-92
2006 Pathfinder
FRONT BLOWER MOTOR RESISTOR
FRONT BLOWER MOTOR RESISTOR
Removal and Installation
PFP:27077
A
EJS004S9
Blower Motor Resistor - Heater and Cooling Unit Assembly
B
C
D
E
F
G
H
I
WJIA1312E
1.
Heater and cooling unit assembly
2.
Intake door motor
4.
Blower motor resistor
5.
Mode door motor
3.
K
REMOVAL
1.
2.
MTC
Air mix door motor
Disconnect the blower motor resistor electrical connector.
Remove the two screws and remove the blower motor resistor.
L
INSTALLATION
Installation is in the reverse order of removal.
M
Revision: February 2007
MTC-93
2006 Pathfinder
DUCTS AND GRILLES
DUCTS AND GRILLES
Components
PFP:27860
EJS004SA
Ducts
LJIA0155E
Revision: February 2007
MTC-94
2006 Pathfinder
DUCTS AND GRILLES
1.
Defroster nozzle
2.
LH side demister duct
3.
LH ventilator duct
4.
RH side demister duct
5.
RH ventilator duct
6.
Center ventilator duct
7.
Front heater and cooling unit assembly
8.
Floor connector duct grilles
9.
Floor connector duct
10. Front floor ducts
11. Floor floor ducts
13. Center console duct
14. Front console duct
A
12. Rear console duct
B
Grilles
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1424E
1.
Instrument panel and pad assembly
2.
LH side ventilator grille
3.
LH ventilator grille
4.
RH ventilator grille
5.
RH side ventilator grille
6.
Console assembly rear base
7.
Rear finisher assembly
8.
Console grille
9.
RH side demister grille
10. Rear cup holder assembly
Removal and Installation
EJS004SB
CONSOLE DUCTS AND CONSOLE GRILLE
Removal
The center console must be removed and disassembled to remove the console ducts and the console grille.
Refer to IP-16, "CENTER CONSOLE" .
Installation
Installation is in the reverse order of removal.
Revision: February 2007
MTC-95
2006 Pathfinder
DUCTS AND GRILLES
DEFROSTER NOZZLE
Removal
1.
2.
Remove the heater and cooling unit assembly. Refer to MTC-87, "HEATER & COOLING UNIT ASSEMBLY" .
Remove the defroster nozzle.
Installation
Installation is in the reverse order of removal.
RH AND LH SIDE DEMISTER DUCTS
Removal
1.
2.
Remove the heater and cooling unit assembly. Refer to MTC-87, "HEATER & COOLING UNIT ASSEMBLY" .
Remove the RH or LH side demister duct.
Installation
Installation is in the reverse order of removal.
RH AND LH VENTILATOR DUCTS
Removal
1.
2.
Remove the heater and cooling unit assembly. Refer to MTC-87, "HEATER & COOLING UNIT ASSEMBLY" .
Remove the RH or LH ventilator duct.
Installation
Installation is in the reverse order of removal.
CENTER VENTILATOR DUCT
Removal
1.
2.
3.
4.
5.
Remove the heater and cooling unit assembly. Refer to MTC-87, "HEATER & COOLING UNIT ASSEMBLY" .
Remove the defroster nozzle.
Remove the RH and LH ventilator ducts.
Remove the RH and LH side demister ducts.
Remove the center ventilator duct.
Installation
Installation is in the reverse order of removal.
FLOOR CONNECTOR DUCT
Removal
1.
2.
Remove the heater and cooling unit assembly. Refer to MTC-87, "HEATER & COOLING UNIT ASSEMBLY" .
Remove the floor connector duct.
Installation
Installation is in the reverse order of removal.
FRONT AND REAR FLOOR DUCTS
Removal
1.
2.
Remove the floor carpet. Refer to EI-29, "FLOOR TRIM" .
Remove the clips and front and rear floor ducts.
Installation
Installation is in the reverse order of removal.
Revision: February 2007
MTC-96
2006 Pathfinder
DUCTS AND GRILLES
GRILLES
Removal
1.
2.
A
Remove the interior trim panel as necessary that contains the grille to be removed. Refer to IP-10,
"INSTRUMENT PANEL ASSEMBLY" and EI-27, "BODY SIDE TRIM" .
Remove the grille from the interior trim panel.
B
Installation
Installation is in the reverse order of removal.
C
D
E
F
G
H
I
MTC
K
L
M
Revision: February 2007
MTC-97
2006 Pathfinder
REFRIGERANT LINES
REFRIGERANT LINES
HFC-134a (R-134a) Service Procedure
PFP:92600
EJS004SC
SETTING OF SERVICE TOOLS AND EQUIPMENT
Discharging Refrigerant
WJIA1160E
1.
Shut-off valve
2.
A/C service valve
3.
Recovery/recycling equipment
WARNING:
Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) refrigerant from the A/C system using certified service equipment meeting
requirements of SAE J2210 HFC-134a (R-134a) recycling equipment or SAE J2201 HFC-134a (R-134a)
recovery equipment. If an accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety information may be obtained from the refrigerant and oil manufacturers.
Evacuating System and Charging Refrigerant
WJIA1161E
1.
Shut-off valve
2.
A/C service valve
3.
Recovery/recycling equipment
4.
Refrigerant container (HFC-134a)
5.
Refrigerant weight scale (J-39699)
6.
Vacuum pump (J-39649)
7.
Manifold gauge set with hoses and
couplers (J-39183-C)
Revision: February 2007
MTC-98
2006 Pathfinder
REFRIGERANT LINES
A
B
C
D
E
F
G
H
I
MTC
K
L
M
WJIA1923E
*1
ATC-22, "CHECKING AND
ADJUSTING" .
*3
ATC-170, "Checking for Refrigerant
Leaks".
*2
ATC-170, "Checking for Refrigerant
Leaks".
*4
ATC-103, "PERFORMANCE TEST
DIAGNOSES".
Revision: February 2007
MTC-99
*5
ATC-5, "Contaminated Refrigerant".
2006 Pathfinder
REFRIGERANT LINES
Components
EJS004SD
A/C Compressor and Condenser
WJIA1253E
Revision: February 2007
MTC-100
2006 Pathfinder
REFRIGERANT LINES
1.
High-pressure service valve
2.
Clip
3.
High-pressure A/C pipe
4.
Refrigerant pressure sensor
5.
Condenser
6.
Compressor shaft seal
7.
High-pressure flexible A/C hose
8.
Low-pressure flexible A/C hose
9.
Low-pressure service valve
10. Low-pressure A/C pipe
11. Expansion valve
A
12. A/C drain hose
B
NOTE:
Refer to MTC-5, "Precautions for Refrigerant Connection" .
Removal and Installation for Compressor
EJS004SE
C
COMPONENTS
A/C Compressor Mounting
D
E
F
G
H
I
LJIA0176E
1.
Compressor
4.
Cylinder block
2.
Front timing chain case
3.
Rear timing chain case
REMOVAL
1.
2.
3.
4.
5.
6.
7.
8.
9.
Discharge the A/C refrigerant. Refer to MTC-98, "HFC-134a (R-134a) Service Procedure" .
Remove the front left wheel and tire assembly. Refer to WT-7, "Rotation" .
Remove the front left mud guard.
Remove the front left splash shield.
Remove the engine air cleaner and air ducts. Refer to EM-16, "AIR CLEANER AND AIR DUCT" .
Remove the drive belt. Refer to EM-14, "DRIVE BELTS" .
Disconnect the compressor harness connector.
Disconnect both the high-pressure flexible A/C hose and low-pressure flexible A/C hose from the compressor.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
Remove the A/C compressor bolts using power tools.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
●
Replace the O-ring of the low-pressure flexible A/C hose and high-pressure flexible A/C hose with
a new one, apply compressor oil to the O-rings before installation.
●
After recharging the A/C system with refrigerant, check for leaks. Refer to MTC-109, "Checking for
Refrigerant Leaks" .
Revision: February 2007
MTC-101
2006 Pathfinder
MTC
K
L
M
REFRIGERANT LINES
Removal and Installation for Compressor Clutch
EJS004SF
Magnet Clutch Assembly
WJIA1162E
1.
Magnet clutch assembly
2.
Magnet coil
3.
Pulley
4.
Clutch disc
5.
Snap ring
6.
Thermal protector (built in)
7.
Compressor
REMOVAL
1.
2.
Remove the compressor. Refer to MTC-101, "Removal and Installation for Compressor" .
Remove the center bolt while holding the clutch disc stationary
using Tool as shown.
Tool number
3.
: J-44614
Remove the clutch disc.
WHA228
4.
Remove the snap ring using external snap ring pliers or suitable
tool.
RHA072C
Revision: February 2007
MTC-102
2006 Pathfinder
REFRIGERANT LINES
5.
Remove the pulley using Tool with a small adapter. Position the
small adapter on the end of the drive shaft and the center of the
puller on the small adapter.
Tool number
A
: KV99233130 (J-29884)
B
CAUTION:
To prevent deformation of the pulley groove, the puller
claws should be hooked under the pulley groove and not
into the pulley groove.
C
WJIA1017E
D
6.
Remove the magnet coil harness clip using a screwdriver,
remove the three magnet coil fixing screws and remove the
magnet coil.
E
F
G
WHA212
INSPECTION
Clutch Disc
H
If the contact surface shows signs of damage due to excessive heat,
replace clutch disc and pulley.
I
MTC
K
WHA183
L
Pulley
Check the appearance of the pulley assembly. If contact surface of pulley shows signs of excessive grooving,
replace clutch disc and pulley. The contact surfaces of the pulley assembly should be cleaned with a suitable
solvent before reinstallation.
Coil
Check magnet coil for loose connections or any cracked insulation.
INSTALLATION
1.
Install the magnet coil.
CAUTION:
Be sure to align the magnet coil pin with the hole in the
compressor front head.
WHA213
Revision: February 2007
MTC-103
2006 Pathfinder
M
REFRIGERANT LINES
2.
3.
Install the magnet coil harness clip using a screwdriver.
Install the pulley assembly using Tool and a wrench, then install
the snap ring using snap ring pliers.
Tool number
:
—
(J-38873-A)
WJIA1016E
4.
Install the clutch disc on the compressor shaft, together with the
original shim(s). Press the clutch disc down by hand.
WHA184
5.
Install the clutch pulley bolt using Tool, to prevent the clutch disc
from turning and tighten the bolt to specification. Refer to MTC101, "COMPONENTS" .
Tool number
: J-44614
CAUTION:
After tightening the clutch pulley bolt, check that the clutch
pulley rotates smoothly.
WHA229
6.
Check the pulley clearance all the way around the clutch disc as
shown.
Clutch disc-to-pulley clearance
7.
8.
: 0.3 - 0.6 mm
(0.012 - 0.024 in)
If the specified clearance is not obtained, replace the adjusting
spacer to readjust.
Install the compressor. Refer to MTC-101, "Removal and Installation for Compressor" .
WHA194
Revision: February 2007
MTC-104
2006 Pathfinder
REFRIGERANT LINES
BREAK-IN OPERATION
When replacing compressor clutch assembly, always conduct the break-in operation. This is done by engaging and disengaging the clutch about 30 times. Break-in operation raises the level of transmitted torque.
Removal and Installation for High-pressure Flexible A/C Hose
EJS004SG
REMOVAL
1.
2.
3.
4.
5.
Remove the front left wheel and tire assembly. Refer to WT-7, "Rotation" .
Remove the front left mud guard.
Remove the front left splash shield.
Discharge the refrigerant. Refer to MTC-98, "HFC-134a (R-134a) Service Procedure" .
Remove the high-pressure flexible A/C hose. Refer to MTC-105, "Removal and Installation for High-pressure Flexible A/C Hose" .
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
A
B
C
D
E
INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-100, "Components" .
CAUTION:
●
Replace the O-ring of the high-pressure flexible A/C hose with a new one, then apply compressor
oil to it for installation.
●
After charging refrigerant, check for leaks.
Removal and Installation for High-pressure A/C Pipe
EJS004SH
REMOVAL
1.
2.
3.
4.
5.
6.
F
G
H
Remove the front right wheel and tire assembly. Refer to WT-7, "Rotation" .
Remove the front right mud guard.
I
Remove the front right splash shield.
Discharge the refrigerant. Refer to MTC-98, "HFC-134a (R-134a) Service Procedure" .
Remove the low pressure A/C pipe. Refer to MTC-106, "Removal and Installation for Low-pressure A/C MTC
Pipe" .
Remove the high-pressure A/C pipe. Refer to MTC-100, "Components" .
CAUTION:
K
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-100, "Components" .
CAUTION:
●
Replace the O-ring of the high-pressure A/C pipe with a new one, then apply compressor oil to it
for installation.
●
After charging refrigerant, check for leaks.
Removal and Installation for Low-pressure Flexible A/C Hose
EJS004SI
REMOVAL
1.
2.
3.
4.
5.
Remove the front right wheel and tire assembly. Refer to WT-7, "Rotation" .
Remove the front right mud guard.
Remove the front right splash shield.
Discharge the refrigerant. Refer to MTC-98, "HFC-134a (R-134a) Service Procedure" .
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
Remove the low-pressure flexible A/C hose. Refer to MTC-105, "Removal and Installation for Low-pressure Flexible A/C Hose" .
INSTALLATION
Installation is in the reverse order of removal.
Revision: February 2007
MTC-105
2006 Pathfinder
L
M
REFRIGERANT LINES
Refer to MTC-100, "Components" .
CAUTION:
●
Replace the O-ring of the low-pressure flexible A/C hose with a new one, then apply compressor
oil to it for installation.
●
After charging refrigerant, check for leaks.
Removal and Installation for Low-pressure A/C Pipe
EJS004SJ
REMOVAL
1.
2.
Discharge the refrigerant. Refer to MTC-98, "HFC-134a (R-134a) Service Procedure" .
Remove the low-pressure A/C pipe. Refer to MTC-100, "Components" .
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-100, "Components" .
CAUTION:
●
Replace the O-ring of the low-pressure A/C pipe with a new one, then apply compressor oil to it for
installation.
●
After charging refrigerant, check for leaks.
Removal and Installation for Refrigerant Pressure Sensor
EJS004SK
REMOVAL
1.
2.
Discharge the refrigerant. Refer to MTC-98, "HFC-134a (R-134a) Service Procedure" .
Disconnect the refrigerant pressure sensor harness connector
and remove the refrigerant pressure sensor from the condenser.
CAUTION:
Be careful not to damage the condenser fins.
LJIA0177E
INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-100, "Components" .
CAUTION:
●
Replace the O-ring of the refrigerant pressure sensor with a new one, then apply compressor oil to
it for installation.
●
Be careful not to damage the condenser fins.
●
After charging refrigerant, check for leaks.
Removal and Installation for Condenser
EJS004SL
REMOVAL
1.
2.
3.
Discharge the refrigerant. Refer to MTC-98, "HFC-134a (R-134a) Service Procedure" .
Remove the radiator. Refer to CO-14, "RADIATOR" .
CAUTION:
Be careful not to damage the core surface of the condenser and the radiator.
Disconnect the high-pressure flexible A/C hose and the high-pressure A/C pipe from the condenser.
CAUTION:
Cap or wrap the joint of the pipes with suitable material such as vinyl tape to avoid the entry of air.
Revision: February 2007
MTC-106
2006 Pathfinder
REFRIGERANT LINES
4.
5.
6.
Disconnect the refrigerant pressure sensor harness connector.
Remove the refrigerant pressure sensor from the condenser.
Lift the condenser out of the mounting grommets and remove
the condenser.
A
B
C
LJIA0177E
D
INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-100, "Components" .
CAUTION:
●
Replace the O-rings of the high-pressure A/C pipe, refrigerant pressure sensor, and high-pressure
flexible A/C hose with new ones, then apply compressor oil to them for installation.
●
After charging refrigerant, check for leaks.
●
Replace the mounting grommets as necessary.
E
F
G
H
I
MTC
K
L
M
Revision: February 2007
MTC-107
2006 Pathfinder
REFRIGERANT LINES
Removal and Installation for Evaporator
EJS004SM
Heater and Cooling Unit Assembly
LJIA0178E
1.
Center ventilator connector duct
2.
Heater core cover
3.
Intake air case
4.
Heater core and evaporator pipes
bracket
5.
Heater core and evaporator pipes
grommet
6.
Heater core
7.
Upper heater and cooling unit case
8.
Expansion valve
9.
Evaporator
10. Lower heater and cooling unit case
Revision: February 2007
11. Blower motor resistor
MTC-108
12. Blower motor
2006 Pathfinder
REFRIGERANT LINES
REMOVAL
1.
2.
3.
A
Remove the heater core. Refer to MTC-89, "HEATER CORE" .
Separate the heater and cooling unit case.
Remove the evaporator.
B
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Replace the O-rings on the A/C low-pressure flexible A/C hose and the high-pressure A/C pipe with
new ones. Apply compressor oil to the O-rings for installation.
C
Removal and Installation for Expansion Valve
D
EJS004SN
REMOVAL
1.
2.
3.
4.
Discharge the refrigerant. Refer to MTC-98, "HFC-134a (R-134a) Service Procedure" .
Remove the heater and cooling unit assembly. Refer to MTC-87, "HEATER & COOLING UNIT ASSEMBLY" .
Remove the heater core and evaporator pipes grommet.
Remove the expansion valve.
E
F
INSTALLATION
Installation is in the reverse order of removal.
G
Expansion valve bolts
: Refer to MTC-100, "Components"
.
A/C refrigerant pipe to expansion valve bolt
: Refer to MTC-100, "Components"
.
H
CAUTION:
●
Replace the O-rings on then expansion valve and the A/C refrigerant pipes with new ones, then
apply compressor oil to them for installation.
●
After charging refrigerant, check for leaks.
MTC
Checking for Refrigerant Leaks
EJS004SO
Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C oil leakage, damage, and corrosion. Any A/C oil leakage may indicate an area of refrigerant leakage. Allow extra
inspection time in these areas when using either an electronic refrigerant leak detector (J-41995) or fluorescent dye leak detector (J-42220).
If any dye is observed using a fluorescent dye leak detector (J-42220), confirm the leak using a electronic
refrigerant leak detector (J-41995). It is possible that the dye is from a prior leak that was repaired and not
properly cleaned.
When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all
system components and connections.
When searching for refrigerant leaks using an electronic refrigerant leak detector (J-41995), move the probe
along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the
component.
CAUTION:
Moving the electronic refrigerant leak detector probe slower and closer to the suspected leak area will
improve the chances of finding a leak.
Checking System for Leaks Using the Fluorescent Dye Leak Detector
1.
2.
3.
EJS004SP
Check the A/C system for leaks using the fluorescent dye leak detector and safety goggles (J-42220) in a
low sunlight area (area without windows preferable). Illuminate all components, fittings and lines. The dye
will appear as a bright green/yellow area at the point of leakage. Fluorescent dye observed at the evaporator drain opening indicates an evaporator core assembly leak (tubes, core or expansion valve).
If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, then inspect the shop rag or cloth with the fluorescent dye leak detector (J-42220) for dye residue.
After the leak is repaired, remove any residual dye using refrigerant dye cleaner (J-43872) to prevent
future misdiagnosis.
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4.
Perform a system performance check and then verify the leak repair using a electronic refrigerant leak
detector (J-41995).
NOTE:
● Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield washer fluid, solvents and oils, may falsely trigger the leak detector. Make sure the surfaces to
be checked are clean.
● Clean with a dry cloth or blow off with shop air.
● Do not allow the sensor tip of the electronic refrigerant leak detector (J-41995) to contact with any substance. This can also cause false readings and may damage the detector.
Dye Injection
EJS004SQ
NOTE:
This procedure is only necessary when recharging the system or when the compressor has seized and must
be replaced.
1.
2.
3.
4.
5.
6.
7.
Check the A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg/cm 2 , 50 psi).
Pour one bottle 7.4 cc (1/4 ounce) of the HFC-134a (R-134a) fluorescent leak detection dye (J-41447) into
the HFC-134a (R-134a) refrigerant dye injector (J-41459).
CAUTION:
If repairing the A/C system or replacing a component, pour the HFC-134a (R-134a) fluorescent leak
detection dye (J-41447) directly into the open system connection and proceed with the service
procedures.
Connect the refrigerant dye injector (J-41459) to the low-pressure service valve.
Start the engine and switch the A/C system ON.
When the A/C system is operating (compressor running), inject one bottle 7.4 cc (1/4 ounce) of HFC-134a
(R-134a) fluorescent leak detection dye (J-41447) through the low-pressure service valve using HFC134a (R-134a) refrigerant dye injector (J-41459). Refer to the manufacturer's operating instructions.
With the engine still running, disconnect the HFC-134a (R-134a) refrigerant dye injector (J-41459) from
the low-pressure service valve.
Operate the A/C system for a minimum of 20 minutes to mix the HFC-134a (R-134a) fluorescent leak
detection dye (J-41447) with the A/C system oil. Depending on the leak size, operating conditions and
location of the leak, it may take from minutes to days for the HFC-134a (R-134a) fluorescent leak detection dye to penetrate an A/C system leak and become visible.
Electronic Refrigerant Leak Detector
EJS004SR
PRECAUTIONS FOR HANDLING LEAK DETECTOR
NOTE:
When performing a refrigerant leak check, use a electronic refrigerant leak detector (J-41995) or equivalent.
Ensure that the electronic refrigerant leak detector (J-41995) is calibrated and set properly according to the
manufacturer's operating instructions.
The electronic refrigerant leak detector (J-41995) is a delicate
device. To use the electronic refrigerant leak detector (J-41995)
properly, read the manufacturer's operating instructions and perform
any specified maintenance.
AHA281A
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1.
Position the probe approximately 5 mm (3/16 in) away from the
point to be checked as shown.
A
B
C
SHA707EA
D
2.
When checking for leaks, circle each fitting completely with the
probe as shown.
E
F
G
SHA706E
3.
H
Move the probe along each component at a speed of approximately 25 - 50 mm (1 - 2 in)/second as shown.
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CHECKING PROCEDURE
NOTE:
To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette
smoke in the vicinity of the vehicle. Perform the leak test in a calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.
1. Turn the engine OFF.
2. Connect the manifold gauge set (J-39183-C) to the A/C service ports. Refer to MTC-9, "Precautions for
Service Equipment" .
3.
4.
Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm2 , 50 psi) above a temperature of
16°C (61°F). If less than specification, recover/evacuate and recharge the system with the specified
amount of refrigerant. Refer to MTC-98, "HFC-134a (R-134a) Service Procedure" .
NOTE:
At temperatures below 16°C (61°F), leaks may not be detected since the system may not reach 345 kPa
(3.52 kg/cm2 , 50 psi) pressure.
Perform the leak test from the high-pressure side (A/C compressor discharge “a” to evaporator inlet “f”) to
the low-pressure side (A/C evaporator drain hose “g” to shaft seal “k”). Refer to MTC-100, "Components"
. Clean the component to be checked and carefully move the electronic refrigerant leak detector probe
completely around the following connections and components.
● Check the compressor shaft seal
● Check the high and low-pressure pipe and hose fittings, relief valve, and compressor shaft seal
● Check the liquid tank
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Check the refrigerant pressure sensor
● Check all around the service valves. Check that the service valve caps are screwed tightly on the service valves (to prevent leaks).
NOTE:
After removing manifold gauge set (J-39183-C) from the service valves, wipe any residue from the service valves to prevent any false readings by the electronic refrigerant leak detector (J-41995).
● Evaporator
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in
the heater and cooling unit assembly. Wait a minimum of 10 minutes accumulation time (refer to the
manufacturer's recommended procedure for actual wait time) before inserting the electronic refrigerant
leak detector probe into the heater and cooling unit assembly drain hose.
NOTE:
Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with
water or dirt that may be in the drain hose.
If a leak is detected, verify at least once by blowing compressed air into the area of the suspected leak,
then repeat the leak check.
Do not stop when one leak is found. Continue to check for additional leaks at all system components and
connections.
If no leaks are found, perform steps 8 - 11.
Start the engine.
Set the heater A/C controls as follows:
A/C switch: ON
Air flow: VENT mode
Intake position: RECIRCULATION mode
Temperature: MAX cold
Blower fan speed: HIGH
●
5.
6.
7.
8.
9.
a.
b.
c.
d.
e.
10. Run the engine at 1,500 rpm for at least 2 minutes.
11. Turn the engine OFF and perform the leak check again following
steps 4 through 6 above.
Refrigerant leaks should be checked immediately after turning
the engine OFF. Begin with the leak detector at the compressor.
The pressure on the high pressure side will gradually drop after
the refrigerant circulation stops and pressure on the low pressure side will gradually rise, as shown in the graph. Some leaks
are more easily detected when the pressure is high.
SHA839E
12. Before connecting the recovery/recycling equipment to the vehicle, check the recovery/recycling equipment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover the refrigerant from the equipment lines and then check the refrigerant purity.
13. Confirm refrigerant purity in supply tank using recovery/recycling equipment and refrigerant identifier
equipment (J-41810-NI).
14. Confirm the refrigerant purity in the vehicle's A/C system using recovery/recycling equipment and refrigerant identifier equipment (J-41810-NI).
15. Discharge the A/C system using recovery/recycling equipment. Repair the leaking fitting or component as
necessary.
16. Evacuate and recharge the A/C system and perform the leak test to confirm that there are no refrigerant
leaks.
17. Conduct the Operational Check to ensure system works properly. Refer to ATC-53, "Operational Check
(Front)" .
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SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Service Data and Specifications (SDS)
PFP:00030
A
EJS004SS
COMPRESSOR
B
Make
CALSONIC KANSEI CO. LTD.
Model
DKS-17D
Type
Swash plate
Displacement
144 cm3 (8.79 in3 ) / revolution
Relief valve set pressure
3800 ± 300 kPa (38.76 ± 3.06 kg/cm2 , 551.0 ± 43.5 psi)
Direction of rotation
Clockwise (viewed from drive end)
Drive belt
Poly V ribbed
C
D
OIL
E
Description
NISSAN A/C System Oil Type S or equivalent
Capacity
180 m
(6.1 US fl oz, 6.3 Imp fl oz)
F
REFRIGERANT
Type
HFC 134a (R-134a)
Capacity
0.70 ± 0.05 kg (1.54 ± 0.11 lb)
G
ENGINE IDLING SPEED
H
Refer to EC-75, "Idle Speed and Ignition Timing Check" .
BELT TENSION
Refer to MA-13, "DRIVE BELT TENSION" .
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SERVICE DATA AND SPECIFICATIONS (SDS)
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