Nissan Quest 2009 Owner's Manual
AIR CONDITIONER
Revision: October 2008
2009 Quest
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SECTION MTC
MANUAL AIR CONDITIONER
CONTENTS
SERVICE INFORMATION ............................3
PRECAUTIONS ...................................................3
Precaution for Supplemental Restrain t System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
Precaution for Working with HFC-134a (R-134a) ......3
Contaminated Refrigerant .........................................3
General Refrigerant Precaution ................................4
Precaution for Leak Detection Dye ...........................4
A/C Identification Label .............................................4
Precaution for Refrigerant Connectio n ......................4
Precaution for Service of Compressor ......................8
Precaution for Service Equipment .............................9
PREPARATION ..................................................11
Special Service Tool .............................. ... ... .... .......11
HFC-134a (R-134a) Service Too l a nd Eq uipment ....11
Commercial Service Tool ........................................13
REFRIGERATION SYSTEM ..............................15
Refrigerant Cycle ....................................................15
Refrigerant System Protection ................................15
Component Part Location ................... ... ... ..............16
OIL ......................................................................19
Maintenance of Oil Quantity in Compressor ...........19
AIR CONDITIONER CONTROL .........................21
Description ..............................................................21
Operation ................................................................21
Description of Control System .................................22
Control Operation ....................................................23
Discharge Air Flow ..................................................25
System Description .................................................26
CAN Communication System Description ...............26
TROUBLE DIAGNOSIS .....................................27
CONSULT-III Function (HVAC) ...............................27
CONSULT-III Function (BCM) .................................28
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ......................................................
29
Component Parts and Harness Connector Loca-
tion ................................ ............................. ..............
Schematic ........................ ................................ ........34
Wiring Diagram - A/C,M - ........................................35
Front Air Control Terminal and Reference Value ....43
3
A/C System Self-Diagnosis Function .......................44
Operational Check (Front) .......................................45
Operational Check (Rear) ........................................47
Power Supply and Ground Circuit for Front Air
Control ............................. ........................................
Mode Door Motor Circuit .........................................50
Air Mix Door Motor Circuit .......................................54
Intake Door Motor Circuit .........................................63
Defroster Door Motor Circuit ....................................67
Front Blower Motor Circuit .......................................69
Rear Blower Motor Circuit .......................................75
Rear Temperature Control Circuit ...........................84
Magnet Clutch Circuit ..............................................90
Insufficient Cooling ..................................................94
Insufficient Heating ................................................101
Heater Pump Circuit ........... ... .... ... ... ... ...................102
Noise .....................................................................105
Self-Diagnosis .......................................................107
Ambient Sensor Circuit ..........................................108
Intake Sensor Circuit .......... ... .... ... ... ......................110
CONTROL UNIT ..............................................113
Removal and Installation .......................................113
AMBIENT SENSOR ........................................ 115
Removal and Installation .......................................115
INTAKE SENSOR ........................................... 116
Removal and Installation .......................................116
BLOWER MOTOR ..........................................118
Component ................... .........................................118
Removal and Installation .......................................119
IN-CABIN MICROFILTER ...............................120
Removal and Installation .......................................120
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HEATER & COOLING UNIT ASSEMBLY ....... 121
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Component ............................................................121
Removal and Installation .......................................122
HEATER CORE ............................................... 124
Component ............................................................124
Removal and Installation .......................................125
HEATER PUMP ............................................... 127
Removal and Installation .......................................127
DEFROSTER DOOR MOTOR ......................... 128
Removal and Installation .......................................128
INTAKE DOOR MOTOR .................................. 129
Component ............................................................129
Removal and Installation .......................................130
MODE DOOR MOTOR .................................... 132
Removal and Installation .......................................132
AIR MIX DOOR MOTOR .................................. 134
Component ............................................................134
Removal and Installation .......................................134
VARIABLE BLOWER CONTROL ................... 136
Component ............................................................136
Removal and Installation .......................................137
REFRIGERANT LINES .....................................143
HFC-134a (R-134a) Service Procedure ................ 143
Component ........................................................... 145
Removal and Installation for Compressor .............147
Removal and Installation for Compressor Clutch ..147
Removal and Installation for Low-Pressure Flexi-
ble Hose ........................ ... ... ... ...............................
Removal and Installation for High-pressure Flexi-
ble Hose ........................ ... ... ... ...............................
Removal and Installation for High-pressure Pipe .. 151
Removal and Installation for High/Low-Pressure
Pipe .................................. .....................................
Removal and Installation for Refrigerant Pressure
Sensor ........................... ............. ............ .......... .....
Removal and Installation for Condenser ...............155
Removal and Installation for Front Evaporator .....157
Removal and Installation for Rear Evaporator ......159
Removal and Installation for Front Expansion
Valve .....................................................................
Removal and Installation for Rear Expansion
Valve .....................................................................
Checking of Refrigerant Leaks ..............................161
Checking System for Leaks Using the Fluorescent
Dye Leak Detector ................................................
Dye Injection . ... ... ... ... ....................................... ... .. 161
Electronic Refrigerant Leak Detector ....................162
150
150
151
155
160
160
161
DUCTS AND GRILLES .................................... 138
Component ............................................................138
Removal and Installation .......................................141
SERVICE DATA AND SPECIFICATIONS
(SDS) ................................................................
Service Data and Specification (SDS) ..................165
165
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< SERVICE INFORMATION >
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PRECAUTIONS
SERVICE INFORMATION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" INFOID:0000000004277527
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.
Precaution for Working with HFC-134a (R-134a) INFOID:0000000004277528
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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 to MTC-3, "Contaminated Refrigerant"
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use refrigerant recovery/
recycling 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:
- 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.
- 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.
- 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 J2209 [HFC-134a (R-134a) recycling
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 refrigerant oil to come in contact with styrofoam parts. Damage may result.
. To
Contaminated Refrigerant INFOID:0000000004277529
If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
• Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into
the atmosphere.
• Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant
supply.
• Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
• If you choose to perform the repair, recover the refrigerant using only dedicated equipment and contain-
ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility does
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PRECAUTIONS
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< SERVICE INFORMATION >
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 Precaution INFOID:0000000004277530
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.
• Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or air
conditioning system.
• Do not store or heat refrigerant containers above 52°C (125°F).
• 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.
• Do not intentionally drop, puncture, or incinerate refrigerant containers.
• Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
• Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent suffocation.
• 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.
Precaution for Leak Detection Dye INFOID:0000000004277531
• The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet
(UV) lamp is required to illuminate the dye when inspecting for leaks.
• Always wear fluorescence enhancing UV safety glasses to protect your eyes and enhance the visibility of
the fluorescent dye.
• 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 (J-
41995).
• 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 should
only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).
• Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a future
service.
• 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 lef t 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 (R134a) and CFC-12 (R-12) A/C systems are different. Do not use HFC134a (R134a) leak detection dye in CFC-12 (R-12) A/C systems or CFC-12 (R-12) leak detection dye in
HFC-134a (R134a) 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 INFOID:0000000004277532
Vehicles with factory installed fluorescent dye have an identification label on the underside of hood.
Precaution for Refrigerant Connection INFOID:0000000004277533
A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.
• 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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< SERVICE INFORMATION >
• 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 Oring 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
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O-RING AND REFRIGERANT CONNECTION
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PRECAUTIONS
Front A/C Compressor and Condenser
1. High-pressure service valve 2. Low-pressure service valve 3. High-pressure pipe
4. Refrigerant pressure sensor 5. Low-pressure flexible hose 6. High-pressure flexible hose
7. Shaft seal 8. Condenser 9. Liquid tank
10. Pressure relief valve 11. Compressor 12. High/low pressure pipe (production)
13. High/low pressure pipe - upper
(service)
14 High/low pressure pipe - lower
(service)
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WJIA1967E
15 Expansion valve (front)
< SERVICE INFORMATION >
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PRECAUTIONS
Rear A/C
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LJIA0016E
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
New 8 92471 N8210 6.8 (0.268) 1.85 (0.0728)
Former 10 J2476 89956 9.25 (0.3642) 1.78 (0.0701)
New
Former 92475 71L00 11.0 (0.433) 2.4 (0.094)
New
Former 92475 72L00 14.3 (0.563) 2.3 (0.091)
New
SHA814E
*: Always check with the Parts Department for the latest parts information.
Former 92477 N8200 17.12 (0.6740) 1.78 (0.0701)
New 24 92195 AH300 21.8 (0.858) 2.4 (0.094)
O-ring
size
12
16
19
Part number* D mm (in) W mm (in)
92472 N8210 10.9 (0.429) 2.43 (0.0957)
92473 N8210 13.6 (0.535) 2.43 (0.0957)
92474 N8210 16.5 (0.650) 2.43 (0.0957)
WARNING:
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< SERVICE INFORMATION >
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.
• When connecting tubes, always use a torque wrench and a back-up wrench.
• After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
• 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.
• 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.
• Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
• Always replace used O-rings.
• When connecting tube, apply oil to circle of the O-rings shown in illustration. Be careful not to apply
oil to threaded portion.
• O-ring must be closely attached to dented portion of tube.
• When replacing the O-ring, be careful not to damage O-ring and tube.
• 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.
• After connecting line, conduct leak test and make sure that there is no leakage from connections.
When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten connections of seal seat to the specified torque.
1. Plug 2. O-ring A. Torque wrench
B. Apply oil C. Do not apply oil to threads D. NG (no good)
E. OK (okay) F. Inflated portion
Precaution for Service of Compressor INFOID:0000000004277534
• 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.
• 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, 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.
• After replacing the compressor magnet clutch, apply voltage to the new one and check for normal
operation. Refer to ATC-164, "Removal and Installation for Compressor Clutch"
WJIA1774E
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< SERVICE INFORMATION >
Precaution for Service Equipment INFOID:0000000004277535
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.
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.
• 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.
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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.
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.
RHA270D
SHA533D
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SERVICE COUPLERS
RHA272D
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< SERVICE INFORMATION >
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 A/C service valve
Clockwise Open
Counterclockwise Close
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.
RHA273D
RHA274D
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.
MTC-10
< SERVICE INFORMATION >
Revision: October 2008
2009 Quest
PREPARATION
PREPARATION
Special Service Tool INFOID:0000000004277536
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
—
(J-38873-A)
Pulley installer
LHA171
KV99233130
(J-29884)
Pulley puller
LHA172
HFC-134a (R-134a) Service Tool and Equipment INFOID:0000000004277537
Description
Installing pulley
Removing pulley
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Never mix HFC-134a refrigerant and/or its specified oil with CFC-12 (R-12) refrigerant and/or its 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
HFC-134a (R-134a)
(—)
Refrigerant
S-NT196
—
(—)
NISSAN A/C System Oil Type S
S-NT197
Description
Container color: Light blue
Container marking: HFC-134a (R134a)
Fitting size: Thread size
• large container 1/2”-16 ACME
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)
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Revision: October 2008
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PREPARATION
Tool number
(Kent-Moore No.)
Tool name
KV991J0130
(ACR2005-NI)
ACR5 A/C Service Center
—
(J-41995)
Electronic refrigerant leak detector
—
(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220)
UV lamp and UV safety goggles
(J-41459)
Refrigerant dye injector
(J-41447)
Quantity 24, 1/4 ounce bottles of
HFC-134a (R-134a) fluorescent
leak detection dye
(J-43872)
Refrigerant dye cleaner
—
(J-42220)
Fluorescent dye leak detector
Description
Refrigerant recovery, recycling and recharging
WJIA0293E
Checking for refrigerant leaks
(Power supply: DC 12V battery terminal)
AHA281A
Leak detection dye
(Power supply: DC 12V battery terminal)
ZHA200H
Checking for refrigerant leak s when fluorescent dye is installed in A/C system.
Includes: UV lamp and UV safety goggles
(Power supply: DC 12V battery terminal)
—
(J-41447)
HFC-134a (R-134a) fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)
—
(J-41459)
HFC-134a (R-134a) Dye injector
Use with (J-41447) 1/4 ounce bottles
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.)
SHA439F
For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.
SHA440F
MTC-12
< SERVICE INFORMATION >
Revision: October 2008
2009 Quest
PREPARATION
Tool number
(Kent-Moore No.)
Tool name
—
(J-43872)
Refrigerant dye cleaner
—
(J-39183-C)
Manifold gauge set (with hoses
and couplers)
Service hoses:
• (J-39500-72B)
High side hose
• (J-39500-72R)
Low side hose
• (J-39500-72Y)
Utility hose
Service couplers:
• (J-39500-20A)
High side coupler
• (J-39500-24A)
Low side coupler
SHA441F
S-NT201
RJIA0196E
Description
For cleaning dye spills.
Identification:
• The gauge face indicates R-134a.
Fitting size: Thread size
• 1/2”-16 ACME
Hose colors:
• 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:
• M14 x 1.5 fitting is optional or permanently attached.
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—
(J-39699)
Refrigerant weight scale
—
(J-39649)
Vacuum pum p
(Including the isolator valve)
Commercial Service Tool INFOID:0000000004277538
MTC-13
S-NT202
S-NT200
S-NT203
For measuring of refrigerant
Fitting size - thread size:
• 1/2” - 16 ACME
Capacity:
• Air displacement: 4 CFM
• Micron rating: 20 microns
• Oil capacity: 482 g (17 oz)
Fitting size: Thread size
• 1/2”-16 ACME
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PREPARATION
Tool number
Tool name
(J-41810-NI)
Refrigerant identifier equipment (R134a)
RJIA0197E
Power tool Loosening bolts and nuts
PIIB1407E
Description
For checking refrigerant purity and
system contamination
MTC-14
< SERVICE INFORMATION >
Revision: October 2008
2009 Quest
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM
Refrigerant Cycle INFOID:0000000004277539
Refrigerant flow
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the front and rear evaporators, and back to the compressor. The refrigerant evaporation through the
evaporator coils are controlled by a front and rear externally equalized expansion valves, located inside the
front and rear evaporator cases.
Refrigerant System Protection INFOID:0000000004277540
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
2
pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm
about 120 kPa (1.22 kg/cm
2
, 17.4 psi).
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/
, 398 psi), or below
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REFRIGERATION SYSTEM
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< SERVICE INFORMATION >
cm2, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
Component Part Location INFOID:0000000004277541
FRONT REFRIGERATION SYSTEM
WJIA1342E
MTC-16
< SERVICE INFORMATION >
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REFRIGERATION SYSTEM
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1. Defroster nozzle (part of the
4. RH side demister duct 5. RH side demister duct extension 6. LH side demister duct extension
7. LH side demister duct 8. RH ventilator duct 9. Center ventilator duct
10. LH ventilator duct 11. Front heater and cooling unit assembly 12. Floor connector duct
13. Floor junction duct extension 1 4. Floor junction duct 15. Floor distribution duct
16. Floor duct ⇐ Front
instrument panel)
2. Fresh air duct 3. Defroster duct
MTC-17
WJIA2219E
P
REFRIGERATION SYSTEM
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< SERVICE INFORMATION >
REAR REFRIGERATION SYSTEM
1 Rear overhead duct 2 Rear heat duct 3 Rear heater and cooling unit assembly
4. Clips
LJIA0086E
MTC-18
< SERVICE INFORMATION >
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OIL
OIL
Maintenance of Oil Quantity in Compressor INFOID:0000000004277542
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)
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:
• Engine speed: Idling to 1,200 rpm
• A/C switch: On
• Blower fan speed: Maximum position
• Temperature control: Optional [set so that intake air temperature is 25° to 30° C (77° to 86°F).]
• Intake position: Recirculation ( )
• 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.
Amount of Oil to be Added
Oil to be added to system
Part replaced
Front evaporator 75 (2.5, 2.6) —
Rear 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.
In case of refrigerant leak
*1: If refrigerant leak is small, no addition of oil is needed.
Amount of oil
m (US fl oz, Imp fl oz)
30 (1.0, 1.1) Large leak
— Small leak *1
Remarks
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Oil Adjustment Procedure for Compressor Replacement
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MTC-19
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OIL
WJIA1716E
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
D. Install new oil equal to recorded
amounts in measuring cup s X plus Y
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
1. 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.
2. Connect recovery/recycling equipment to vehicle. Confirm refrigerant purity in supply tank using recovery/
recycling equipment and refrigerant identifier. If NG, refer to MTC-3, "Contaminated Refrigerant"
.
3. Confirm refrigerant purity in vehicle A/C system using recovery/recycling equipment and refrigerant identifier. If NG, refer to MTC-3, "Contaminated Refrigerant"
.
4. Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure oil discharged into the
recovery/recycling equipment.
5. Drain the oil from the “old” (removed) compressor into a graduated container and recover the amount of
oil drained.
6. Drain the oil from the “new” compressor into a separate, clean container.
7. 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.
8. Measure an amount of new oil equal to the amount recovered during discharging. Add this oil to “new”
compressor through the suction port opening.
9. 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.
CAUTION:
Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor.
MTC-20
< SERVICE INFORMATION >
Revision: October 2008
2009 Quest
AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL
Description INFOID:0000000004277543
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 three sensors:
• Ambient sensor
• 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
The front air control also provides separate regulation of the vehicle's interior temperature for the rear passenger area. The system is based on the temperature and rear blower settings selected from rear air control
(front) control dials located in the overhead console, or from the rear temperature and blower settings from the
rear air control (rear) control dials, when the REAR CTRL switch is pressed (indicator light is on) on the rear
air control (front).
The front air control is used to select:
• Outlet air volume
• Air temperature/distribution
Operation INFOID:0000000004277544
AIR MIX DOOR CONTROL
The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature
switch.
BLOWER SPEED CONTROL
Blower speed is controlled based on front and rear blower control dial settings.
When blower switch is turned, the blower motor starts and increases air flow volume each time the blower control dial is turned clockwise, and decreases air flow volume each time the blower control dial switch is turned
counterclockwise.
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INTAKE DOORS CONTROL
The intake doors are controlled by the recirculation switch setting, and the mode (recirculation is not allowed in
floor, floor/defrost or defrost modes) switch setting.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode switch.
DEFROSTER DOOR CONTROL
The defroster door is controlled by pressing the defroster mode switch.
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AIR CONDITIONER CONTROL
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MAGNET CLUTCH CONTROL
WJIA2161E
When the A/C switch is pressed, or the defroster mode switch is pressed, the front air control outputs a compressor ON signal to BCM.
The BCM then sends a compressor ON signal to ECM and front air control, via CAN communication line.
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.
SELF-DIAGNOSTIC SYSTEM
The self-diagnostic system is built into the front air control to quickly locate the cause of certain symptoms.
Refer to ATC-45, "A/C System Self-Diagnosis Function"
.
Description of Control System INFOID:0000000004277545
The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.
MTC-22
AIR CONDITIONER CONTROL
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< SERVICE INFORMATION >
The relationship of these components is shown in the figure below:
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WJIA2160E
Control Operation INFOID:0000000004277546
Front air control
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MTC-23
AIR CONDITIONER CONTROL
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< SERVICE INFORMATION >
Rear air control (rear)
TEMPERATURE CONTROL DIAL (FRONT)
Increases or decreases the set temperature.
TEMPERATURE CONTROL DIAL (REAR)
Increases or decreases the set temperature.
WJIA2015E
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-
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, at the D/F position, or in floor mode.
REAR WINDOW DEFOGGER SWITCH
When switch is ON, rear window is defogged.
OFF SWITCH
The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet
doors are set to the foot position.
A/C SWITCH
The compressor is ON or OFF.
MODE SWITCHS (FRONT)
Controls the air discharge outlets through control of the mode and defroster doors.
MODE DIAL (REAR)
Controls the air/temperature at discharge outlets.
FRONT BLOWER CONTROL DIAL
Manually control the blower speed. Fourteen speeds are available for manual control.
REAR BLOWER CONTROL DIAL (FRONT)
When the REAR CTRL switch is off (indicator off) the rear air control (front) controls the rear blower motor
speed regardless of the rear air control (rear) blower control dial (rear) position. The rear air control (front) controls the blower motor speed and the temperature/mode settings.
REAR BLOWER CONTROL DIAL (REAR)
When the REAR CTRL switch is on (indicator on) the rear air control (rear) controls the rear blower motor
speed regardless of the rear air control (front) blower control dial (front) position. The rear air control (rear)
controls the blower motor speed and the temperature/mode settings.
MTC-24
AIR CONDITIONER CONTROL
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< SERVICE INFORMATION >
Discharge Air Flow INFOID:0000000004277547
FRONT
WJIA2016E
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REAR
NOTE:
Hot air comes from the floor vents, cold air comes from the roof
vents, and blended air comes from both vents.
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AIR CONDITIONER CONTROL
System Description
SWITCHES AND THEIR CONTROL FUNCTION
INFOID:0000000004277548
WJIA0531E
CAN Communication System Description INFOID:0000000004277549
Refer to LAN-3, "CAN Communication System".
WJIA2163E
MTC-26
< SERVICE INFORMATION >
Revision: October 2008
2009 Quest
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
CONSULT-III Function (HVAC) INFOID:0000000004277550
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
Diagnostic mode Description
SELF-DIAG RESULTS Displays front air control self-diagnosis results.
DATA MONITOR Displays front air control input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ECU PART NUMBER Front air control part number can be read.
SELF-DIAGNOSIS
Operation Procedure
1. Touch “SELF-DIAG RESULTS” on “SELECT DIAG MODE” screen to view all set DTC's.
Display Item List
DTC Reference page
B2573 Battery voltage out of range SC-4
B2575 BCM not responding to A/C request MTC-90, "Magnet Clutch Circuit"
B2576 BCM not responding to rear defroster request GW-76
B2577 Air mix door motor (front) circuit failure MTC-54, "Air Mix Door Motor Circuit"
B257A Air mix door motor (rear) circuit failure MTC-54, "Air Mix Door Motor Circuit"
B257B Ambient sensor circuit open
B257C Ambient sensor circuit short
B2581 Intake sensor circuit short
B2582 Intake sensor circuit open
B2583 Defroster door motor circuit failure MTC-67, "Defroster Door Motor Circuit"
B2584 Intake door motor (passenger) circuit failure MTC-63, "Intake Door Motor Circuit"
U1000 CAN bus fault LAN-6
B2586 Intake door motor (driver) circuit failure MTC-63, "Intake Door Motor Circuit"
B2587 Stuck button MTC-113, "Removal and Installation"
B2587 Mode door motor circuit failure MTC-50, "Mode Door Motor Circuit"
DATA MONITOR
MTC-108, "Ambient Sensor Circuit"
MTC-110, "Intake Sensor Circuit"
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Operation Procedure
1. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
2. Touch either “MAIN SIGNALS” or “SELECTION FROM MENU” on “DATA MONITOR” screen.
MAIN SIGNALS Monitors all the items.
SELECTION FROM
MENU
3. When “SELECTION FROM MENU” is selected, touch items to be monitored. When “MAIN SIGNALS” is
selected, all the items will be monitored.
4. Touch “START”.
5. Touch “RECORD” while monitoring, then the status of the monitored item can be recorded. To stop
recording, touch “STOP”.
Display Item List
Selects and monitors the individual item selected.
MTC-27
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< SERVICE INFORMATION >
Monitor item Val ue Contents
BATT VIA CAN "V" Displays battery voltage signal.
IGN VIA CAN "ON/OFF" Displays ignition switch signal.
AMB TEMP SEN "°C/°F" Displays ambient temperature sensor signal.
EVAP TEMP SEN "°C/°F" Displays intake sensor signal.
RR TEMPSET FR "V" Displays air mix door (front) set point signal.
RR TEMPSET RR "V" Displays air mix door (rear) set point signal.
MODE FDBCK "V" Displays mode door motor feedback signal.
DVR MIX FDBCK "V" Displays intake door motor (driver) feedback signal.
PAS MIX FDBCK "V" Displays intake door motor (passenger) feedback signal.
RR FDBCK "V" Displays air mix door motor (rear) feedback signal.
DEF FDBCK "V" Displays defroster door motor feedback signal.
RECIRC "ON/OFF" Displays recirculation switch signal.
A/C "ON/OFF" Displays A/C switch signal.
MODE "ON/OFF" Displays MODE dial signal.
RR DEFOG "ON/OFF" Displays rear defroster request signal.
" [ PNL ]"
" [ MIX ]"
MODE SELECT
" [ FLR ]"
" [ DEFR ]"
" [ MAX ]"
" [ DENT ]"*
*: DENT is displayed when MODE dial is between selections.
Displays mode door motor position.
CONSULT-III Function (BCM) INFOID:0000000004277551
CONSULT- III can display each diagnostic item using the diagnostic test modes shown following.
BCM diagnostic
test item
Inspection by part
DATA MONITOR
Operation Procedure
1. Touch “AIR CONDITIONER” on “SELECT TEST ITEM” screen.
2. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
3. Touch either “ALL SIGNALS” or “SELECTION FROM MENU” on “DATA MONITOR” screen.
Diagnostic mode Description
Supports inspections and adjustments. Commands are transmitted to the BCM for
WORK SUPPORT
DATA MONITOR Displays BCM input/output data in real time.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ECU PART NUMBER BCM part numb er can be read.
CONFIGURATION Performs BCM configuration read/write functions.
setting the status suitable for required operation, input/output signals are received
from the BCM and received data is displayed.
ALL SIGNALS Monitors all the items.
SELECTION FROM
MENU
4. Touch “START”.
Selects and monitors the individual item selecte d.
MTC-28
TROUBLE DIAGNOSIS
Revision: October 2008
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< SERVICE INFORMATION >
5. When “SELECTION FROM MENU” is selected, touch items to be monitored. When “ALL SIGNALS” is
selected, all the items will be monitored.
6. Touch “RECORD” while monitoring, then the status of the monitored item can be recorded. To stop
recording, touch “STOP”.
Display Item List
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B
Monitor item name “operation or
unit”
IGN ON SW “ON/OFF” Displays “IGN Position (ON)/OFF, ACC Position (OFF)” status as j udg ed f rom ign iti on s wi tch sign al .
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.
Contents
How to Perform Trouble Diagnosis for Quick and Accurate Repair INFOID:0000000004277552
WORK FLOW
SHA900E
*1 MTC-45, "Operational Check (Front)"
SYMPTOM TABLE
Symptom Reference Page
MTC-48, "Power
A/C system does not come on. Go to Trouble Diag nosis Procedure for A/C System.
A/C system cannot be controlled. Go to Self-diagnosis Function.
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.
Intake door motor is malfunctioning.
Defroster door motor is malfunctioning. Go to Trouble Diagnosis Procedure for Defroster Door Motor.
Front blower motor operation is malfunctioning.
Rear blower motor operation is malf unctioning.
Go to Trouble Diagnosis Procedure for Mode Door Motor.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
Go to Trouble Diagnosis Procedure for Intake Door Motor.
Go to Trouble Diagnosis Procedure for Front Blower Motor.
Go to Trouble Diagnosis Procedure for Rear Blower Motor.
Supply and
Ground Circuit for
Front Air Control"
MTC-44, "A/C
System Self-Diag-
nosis Function"
MTC-50, "Mode
Door Motor Cir-
cuit"
MTC-54, "Air Mix
Door Motor Cir-
cuit"
MTC-63, "Intake
Door Motor Cir-
cuit"
MTC-67, "Defroster Door Motor Circuit"
MTC-69, "Front
Blower Motor Cir-
cuit"
MTC-75, "Rear
Blower Motor Circuit"
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MTC-29
TROUBLE DIAGNOSIS
Revision: October 2008
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< SERVICE INFORMATION >
Symptom Reference Page
Rear discharge air temperature and/or air
outlet does not change.
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch.
Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling.
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating.
Noise Go to Trouble Diagnosis Procedure for Noise. MTC-105, "Noise"
Self-diagnosis cannot be performed. Go to Trouble Diagnosis Procedure for Self-diagnosis.
Go to Trouble Diagnosis Procedure for Rear Air Control circuit.
MTC-84, "Rear
Temperature Control Circuit"
MTC-90, "Magnet
Clutch Circuit"
MTC-94, "Insuffi-
cient Cooling"
MTC-101, "Insuffi-
cient Heating"
MTC-107, "Self-
Diagnosis"
Component Parts and Harness Connector Location
ENGINE COMPARTMENT
INFOID:0000000004277553
MTC-30
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