Nissan Altima 2003 Owner's Manual
J AIR CONDITIONER
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SECTION
MANUAL AIR CONDITIONER
CONTENTS
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Working with HFC-134a (R-134a) ..... 3
Contaminated Refrigerant ........................................ 3
General Refrigerant Precautions .............................. 4
Precautions for Leak Detection Dye ......................... 4
A/C Identification Label ............................................ 4
Precautions for Refrigerant Connection ................... 5
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ................................ ...................... 5
O-RING AND REFRIGERANT CONNECTION ..... 6
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
CHARGING CYLINDER .......................................11
Wiring Diagrams and Trouble Diagnosis .................11
PREPARATION ......................................................... 12
Special Service Tools ............................................. 12
HFC-134a (R-134a) Service Tools and Equipment ... 12
Commercial Service Tools ...................................... 15
REFRIGERATION SYSTEM ....................... ....... ....... 16
Refrigeration Cycle ................................................. 16
REFRIGERANT FLOW ....................................... 16
REFRIGERANT SYSTEM PROTECTION .......... 16
Component Layout ................................................. 17
LUBRICANT ............................................................. 18
Maintenance of Lubricant Quantity in Compressor ... 18
LUBRICANT ....................... ................................. 18
CHECKING AND ADJUSTING ........................... 18
AIR CONDITIONER CONTROL ............................... 21
Control Operation ........... ....... ...... ....... ...... .............. 21
FAN CONTROL DIAL ........................... ....... ....... 21
AIR CONTROL DIAL ........................................... 21
TEMPERATURE CONTROL DIAL ......................21
RECIRCULATION (REC) SWITCH ..................... 21
AIR CONDITIONER (A/C) SWITCH ....................21
Discharge Air Flow .................................................22
System Description .................................................23
SWITCHES AND THEIR CONTROL FUNCTION ...23
CAN Communication System Description .............. 23
FOR TCS MODELS ............................................23
FOR A/T MODELS .............................................. 25
FOR M/T MODELS ............................................. 26
TROUBLE DIAGNOSIS ............................................ 28
How to Perform Trouble Diagnoses for Quick and
Accurate Repair ......................................................28
WORK FLOW ......................................................28
SYMPTOM TABLE .............................................. 28
Component Parts and Harness Connector Location ... 29
ENGINE COMPARTMENT .................................. 29
PASSENGER COMPARTMENT .........................31
Circuit Diagram .......................................................32
Wiring Diagram — HEATER — .............................. 33
Wiring Diagram — A/C,M — ...................................35
Operational Check ..................................................38
CONDITIONS: ....................... ..............................38
PROCEDURE: .................................................... 38
A/C System .............................................................40
DIAGNOSTIC PROCEDURE .............................. 40
Mode Door Motor Circuit ........................................42
INSPECTION FLOW ........................................... 42
SYSTEM DESCRIPTION ............ ....... ...... ....... ....43
DIAGNOSTIC PROCEDURE .............................. 43
MODE DOOR ......................................................44
Air Mix Door ............................................................45
INSPECTION FLOW ........................................... 45
CONTROL LINKAGE ADJUSTMENT .................45
Intake Door Motor Circuit ........................................46
INSPECTION FLOW ........................................... 46
SYSTEM DESCRIPTION ............ ....... ...... ....... ....46
DIAGNOSTIC PROCEDURE .............................. 47
CONTROL LINKAGE ADJUSTMENT .................48
Blower Motor Circuit ............................................... 49
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INSPECTION FLOW ...........................................49
DIAGNOSTIC PROCEDURE ..............................49
ELECTRICAL COMPONENTS INSPECTION ..... 53
Magnet Clutch Circuit .............................................54
INSPECTION FLOW ...........................................54
DIAGNOSTIC PROCEDURE ..............................55
REFRIGERANT PRESSURE SENSOR ..............57
Insufficient Cooling .................................................58
INSPECTION FLOW ...........................................58
PERFORMANCE CHART ...................................59
TROUBLE DIAGNOSES FOR ABNORMAL
PRESSURE ........................ .................................59
Insufficient Heating .................................................63
INSPECTION FLOW ...........................................63
Noise ......................................................................64
INSPECTION FLOW ...........................................64
Intake Sensor Circuit ..............................................65
COMPONENT DESCRIPTION ............................65
DIAGNOSTIC PROCEDURE ..............................65
CONTROL UNIT ........................................................ 67
Removal and Installation ........................................67
REMOVAL ...........................................................67
INSTALLATION .................................................... 67
INTAKE SENSOR .....................................................68
Removal and Installation ........................................68
BLOWER UNIT .........................................................69
Removal and Installation ........................................69
REMOVAL ...........................................................69
BLOWER MOTOR ....................................................70
Removal and Installation ........................................70
INTAKE DOOR MOTOR ...........................................71
Removal and Installation ........................................71
IN-CABIN MICROFILTER .........................................72
Removal and Installation ........................................72
FUNCTION .......................................................... 72
REPLACEMENT TIMING ....................................72
REPLACEMENT PROCEDURES .......................72
HEATER & COOLING UNIT ASSEMBLY .................73
Removal and Installation ........................................73
REMOVAL ...........................................................73
INSTALLATION ................................................... 73
HEATER CORE .........................................................74
Removal and Installation ........................................74
MODE DOOR MOTOR .............................................. 75
Removal and Installation ........................................75
DRIVER SIDE MODE DOOR MOTOR .. ....... .......75
BLOWER FAN RESISTER ........................................76
Removal and Installation ........................................76
DUCTS AND GRILLES .............................................77
Removal and Installation ........................................77
Ventilator Duct, Defroster Nozzle and Defroster
Ducts ...................................... ...... ....... ...... ....... .......77
Center Ventilator Grille ...........................................77
Side Ventilator Grille LH .........................................77
Side Ventilator Grille RH ......................................... 78
Floor duct ................................................................78
REFRIGERANT LINES .............................................79
HFC-134a (R-134a) Service Procedure ..................79
SETTING OF SERVICE TOOLS AND EQUIP-
MENT .............................. .....................................79
Components ....................... .................... .................80
Removal and Installation for Compressor —
QR25DE Models .....................................................83
REMOVAL ...........................................................83
INSTALLATION ...................................................83
Removal and Installation for Compressor —
VQ35DE Models .....................................................84
REMOVAL ...........................................................84
INSTALLATION ...................................................84
Removal and Installation for Compressor Clutch ....85
REMOVAL ........................................................ ....85
INSPECTION ............ ...........................................86
INSTALLATION ................................................ ....86
BREAK-IN OPERATION ......................................87
Removal an d Installation f or Low-pressure Fl exible
Hose ............................. ............. ............. ............. ....87
REMOVAL ...........................................................87
INSTALLATION ...................................................87
Removal and Installation for High-pressure flexible
hose ........................................................................88
REMOVAL ...........................................................88
INSTALLATION ...................................................88
Removal and Installation for High-pressure Pipe ....88
REMOVAL ...........................................................88
INSTALLATION ...................................................88
Removal and Installation for Refrigerant Pressure
Sensor ....................................... ............. .................88
Removal and Installation for Condenser .................88
REMOVAL ...........................................................88
INSTALLATION ...................................................89
Removal and Installation for Liquid Tank ................89
Removal and Installation for Evaporator .................90
REMOVAL ........................................................ ....90
INSTALLATION ................................................ ....91
Removal and Installation for Expansion Valve ........91
REMOVAL ........................................................ ....91
INSTALLATION ................................................ ....91
Checking for Refrigerant Leaks ..............................91
Checking System for Leaks Using the Fluorescent
Leak Detector ..........................................................92
Dye Injection ...........................................................92
Electronic Refrigerant Leak Detector ......................92
PRECAUTIONS FOR HANDL ING LEAK
DETECTOR .........................................................92
CHECKING PROCEDURE ..................................93
SERVICE DATA AND SPECIFICATIONS (SDS) ......95
Service Data and Specifications (SDS) ..................95
COMPRESSOR .............. .....................................95
LUBRICANT .................... ............. ............. ...........95
REFRIGERANT ...................................................95
ENGINE IDLING SPEED .....................................95
BELT TENSION ...................................................95
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PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER”
EJS001GB
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The Supplemental Re straint 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 ino perative, whi ch could incr ease the risk of pe rsonal 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, inc luding incorrect removal and installation of the SRS, can lead to per-
sonal injury ca use d by unintentional ac tiv atio n o f the system. For remo va l of Spiral Cable and Air
Bag Module, see the SRS section.
● Do not use electrical test equ ipment o n any circu it related to the SRS unless in structed 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)
EJS001ED
WARNING:
● CFC-12 (R-12) refrigerant and HFC-13 4a (R-1 34a) refrige rant are not com patible. If the refrigera nts
are mixed, compressor failure is likely to occur. Refer to MTC-3, "
Contaminated Refrigerant" . To
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant
Recovery/R ecycling Recharging equipment and Refrigerant Identifier.
● Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-
nents. If lubricant other than that specified is used, compressor failure is likely to occur.
● The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
lowing handling precautions must be observed:
– When removing refrig erant components from a vehicl e, immediately cap (s eal) the component to
minimize the entry of moisture from the atmosphere.
– When installing refrigera nt components to a vehicle, do not r emove the caps (unseal) until just
before connecting the com ponen ts. Connect all refrigeran t loop compo nents as quickly as poss ible to minimize the entry of moisture into system.
– Only use the specified lubricant from a sealed container. Immediately reseal containers of lubri-
cant. Without proper sealing, lubricant will become moisture saturated and should not be used.
– Avoid breathing A/C refrigerant and lubrica nt vapo r or mist. Ex posure may irritate eyes, nose a nd
throat. Remove R-134a from the A/C system using certified servi ce equipment meeting requirements of SAE J2210 (R-134a recycling equipment), or J2209 (R-134a recovery equipment). If accidental system discharge occurs, ventilate work area before resuming service. Additional health
and safety information may be obtained from refrigerant and lubricant manufacturers.
– Do not allow A/C lubricant to come in contact with styrofoam parts. Damage may result.
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Contaminated Refrigerant
EJS001EE
If a refrigerant other than pure 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 atm osphere.
● Explain that recov ery of the con taminated refrig erant cou ld dama ge your serv ice equi pment and re friger-
ant supply.
● Suggest the cust omer return the v ehic le t o t he lo cation of prev ious servic e w here the c ontami natio n may
have occurred.
● If you choose t o per form the re p air, re cover the r efri ger ant usi ng on ly dedicated equipment and contain-
ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility
does not have dedicated recovery equipment, you may contact a local refrigerant product retailer for avail-
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PRECAUTIONS
able service. This refrigerant must be disposed of in accordance with all federal and local regulations. In
addition, replacement of all refrigerant system compon ents on the vehicle is recommended.
● If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact Nissan Cus-
tomer Affairs for further assistance.
General Refrigerant Precautions
EJS001EF
WARNING:
● Do not release refrigerant into the air. Use approved recover y/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.
● Always wear eye and hand protectio n (goggles and glov es) when workin g with any refrigerant o r
air conditioning system.
● Do not store or heat refrigerant containers above 52°C (125°F).
● Do not heat a refrigerant container with an ope n fl am e; if container warming is require d, p lac e 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 o xygen, therefore be certain to work in well ventilated areas to prevent
suffocation.
● Do not pressure test or lea k test HFC-134a (R-134a) se rvice equipment and/or veh icle air condi-
tioning systems with compressed air during repair. Some mixtures of air and R-134a have been
shown to be combustibl e at elevated pressures. These m ixtures, if ignited, may cause injury or
property damage. Additiona l he al th a nd s afety information may be obtained from refrigera nt m an ufacturers.
Precautions for Leak Detection Dye
● The A/C syste m cont a ins a f luor escen t leak d ete ctio n dye u sed for loc ating r efri ger ant le aks. An ul travi ole t
EJS001EG
(UV) lamp is required to illuminate the dye when inspecting for leaks.
● Always wear fluoresce nc e en hancing UV safety gl as s es to p rotect your eyes a nd en ha nc e the visibility of
the fluorescent dye.
● A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal
should only be repaired after confirming the leak wit h 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 immedi ate ly wit h th e app roved dye c lean er. Flu oresce nt d ye le ft on a sur fac e for an ex tend ed pe riod
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 R-134a an d R-12 A/C sys tems are different. Do not use R-13 4a leak detecti on
dye in R-12 A/C sys tems or R- 12 le ak d etect ion d ye i n R-1 34a A/C sy stem s or A/ C sy stem dam age may
result.
● The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure
occurs.
A/C Identification Label
EJS001EH
Vehicles with factory installed fluorescent dye have this identification
label on the underside of hood.
NOTE:
Vehicles with factory installed fluorescent dye have a green
label.
WJIA0012E
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PRECAUTIONS
Precautions for Refrigerant Connection
EJS001EI
A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.
● Expansion valve to co oling unit
● Evaporator pipes to evaporator (inside cooling unit)
● Refrigerant pressure sensor
FEATURES OF NEW TYPE REFRIGERANT CONNECTION
● The O-ring has been relocated. It has also been provided with a groove for proper installation. This elimi-
nates the chance 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 re lation to the contacti ng surface of the m ating part to improv e sealing
characteristics.
● The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facil-
itating piping connections.
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O-RING AND REFRIGERANT CONNECTION
QR25DE Models
WJIA0131E
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PRECAUTIONS
VQ35DE Models
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CAUTION:
The new and former refrigeran t connections use different O-ring configuratio ns. Do not confuse Orings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or
around, the connection.
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PRECAUTIONS
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)
O-ring
size
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16
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)
SHA814E
*: Always check with the Parts Department for the latest parts information.
New 19 92474 N8210 16.5 (0.650) 2.43 (0.0957)
WARNING:
Make sure all refrigera nt is disc ha rg ed into the rec yc ling equi pm ent a nd the pr es su re in the sy ste m 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 remo ved, store it in the sa me positio n as it is whe n mounted on the car.
Failure to do so will cause lubricant to enter the low pressure chamber.
● When connecting tubes, al ways use a torque wrench and a back-up wrench.
● After disconnecting tubes, immediately plug all openings to p revent entry of dirt and mois ture.
● When installing an air conditioner in the vehicle, c onne ct the pipes as the final stage of the opera-
tion. Do not remove the seal ca ps of pipes and other compon ents 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 lubricant to circle of the O-rings shown in illustration. Be careful not
to apply lubricant to threaded portion.
Lubricant name: Nissan A/C System Lubricant Type DH-PS or equivalent
Part number: KLH00-PAGS0
● 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.
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MTC-8
PRECAUTIONS
● After connecting li ne, co nduct leak test and ma ke s ure that there is no lea kage from c onnections.
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.
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RHA861F
Precautions for Servicing Compressor
● 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 com pressor, follow “Maintenance of Lubrica nt Quantity in Com pres-
sor” exactly. Refer to MTC-18, "
● Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with lubri-
Maintenance of Lubricant Quantity in Compressor" .
EJS001EJ
cant, 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 e qually distribute lubricant inside the compresso r. After the compressor is
installed, let the engine idle and operate the compressor for 1 hour.
● After replac ing the compressor magnet clutch, apply voltage to the new one and check for normal
operation. [Gap between clutch disc and pulley is 0.3 - 0.6 mm (0.012 - 0.024 in)]
Precautions for Service Equipment
EJS001EK
RECOVERY/ RECYCLING EQUIPMENT
Follow the man uf ac turer's instructio ns for machine op era tion and machi ne m ai nte na nc e . N e ve r i ntroduce any
refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operation and tester maintenance.
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VACUUM PUMP
The lubricant contained inside the vac uum pump is not co mpatible
with the specified lubricant for HFC-134a (R-134a) A/C systems.
The vent side of the vacuum pump is exposed to atmospheric pressure so the vacuu m pump l ubric ant ma y migra te ou t of th e pump in to
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 man-
ual shut-off valve near th e pump end. Clo se the valv e 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 co ndition. Such valves ma y restrict the pump's
ability to pull a deep vacuum and are not recommended.
MANIFOLD GAUGE SET
Be certain that the gaug e fac e indi cates R-13 4a or 1 34a. Mak e su re
the gauge set has 1/2″-16 ACME threaded connections for service
hoses. Confirm the set has been used only with refrigerant HFC134a (R-134a) along with specified lubricant.
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
RHA272D
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PRECAUTIONS
SERVICE COUPLERS
Never attempt to conn ect HFC-134a (R-1 34a) service coupl ers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly conn ect to the CFC-12 (R-12) sy stem. However, if an
improper connection is attempted, discharging and contamination
may occur.
Shut-off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close
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RHA273D
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 sc ale or of quality recycle/recharge equipment.
Wiring Diagrams and Trouble Diagnosis
When you read wiring diagrams, refer to the following:
● GI-12, "How to Read Wiring Diagrams"
● PG-3, "POWER SUPPLY ROUTING CIRCUIT"
When you perform trouble diagnosis, refer to the following:
● GI-9, "How to Follow Trouble Diagnoses"
● GI-25, "How to Perform Efficient Diagnosis for an Electrical Incident"
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PREPARATION
PREPARATION PFP:00002 Special Service Tools
EJS001EM
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)
Drive plate installer
WJIA0367E
KV99233130
(J-29884)
Pulley puller
LHA172
HFC-134a (R-134a) Service Tools and Equipment
Description
Installing pulley and drive plate
Removing pulley
EJS001EN
Never mix HFC-134a (R-134a) refrigerant and/or its specified lubricant with CFC-12 (R-12) refrigerant and/or
its lubricant.
Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/lubricant.
Refrigerant containe r fittings, service hose fitti ngs and service equipment fit tings (equipment which handle s
refrigerant and/or lubricant) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid
mixed use of the refrigerants/lubricant.
Adapters that conv ert one size fitting to anot her must never be used: refrig erant/lubricant contamin ation will
occur and compress or fai lure will result.
Tool number
(Kent-Moore No.)
Tool name
Description
Container color:Light blue
Container marking:HFC-134a (R-
HFC-134a (R-134a) refrigerant
S-NT196
KLH00-PAGS0
( - )
Nissan A/C System Lubricant Type
DH-PS
S-NT197
(J-43600)
Recovery/Recycling
Recharging equipment (ACR2000)
WJIA0293E
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134a)
Fitting size: Thread size
● large container 1/2
Type:Poly alkylene glycol oil (PAG),
type DH-PS
Application:HFC-134a (R-134a) vane
rotary compressors (Nissan only)
Lubricity: 40 m (1.4 US fl oz, 1.4 Imp
fl oz)
Function:Refrigerant Recovery and
Recycling and Recharging
2
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PREPARATION
Tool number
(Kent-Moore No.)
Tool name
(J-41995)
Electronic refrigerant leak detector
(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220) UV lamp and UV safety
glasses
(J-41459) Refrigerant dye injector
(J-41447) qty. 24
HFC-134a (R-134a) refrigerant
dye
(J-43872) Refrigerant dye cleaner
AHA281A
SHA437F
Description
Power supply:
● DC 12V (Cigarette lighter)
Power supply:
DC 12V (Battery terminal)
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(J-42220)
Fluorescent dye leak detector
(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 bottle
SHA438F
SHA439F
SHA440F
Power supply: DC 12V (Battery terminal)
For checking refrigerant leak when fluorescent dye is installed in A/C system.
Includes: UV lamp and UV safety
glasses
Application: For HFC-134a (R-134a)
PAG oil
Container: 1/4 ounce (7.4cc) bottle
(Includes self-adhesive dye identification labe ls for affixing to vehi cle after
charging system with dye.)
For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.
I
MTC
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L
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(J-43872)
Dye cleaner
SHA441F
Revision: May 2004 2003 Altima
MTC-13
For cleaning dye spills.
Tool number
(Kent-Moore No.)
Tool name
PREPARATION
Description
(J-39183-C)
Manifold gauge set (with hoses
and couplers)
Service hoses
● High side hose
(J-39500-72B)
● Low side hose
(J-39500-72R)
● Utility hose
(J-39500-72Y)
Service couplers
● High side coupler
(J-39500-20A)
● Low side coupler
(J-39500-24A)
S-NT201
S-NT202
RJIA0196E
Identification:
● The gauge face indicates R-134a.
Fitting size: Thread size
2
● 1/2
-16 ACME
Hose color:
● 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:
2
● 1/2
-16 ACME
Hose fitting to service hose:
● M14 x 1.5 fitting is optional or perma-
nently attached.
(J-39699)
Refrigerant weight scale
(J-39649)
Vacuum pump
(Including the isolator valve)
S-NT200
S-NT203
For measuring of refrigerant
Fitting size: Thread size
2
● 1/2
-16 ACME
Capacity:
● Air displacement: 4 CFM
● Micron rating: 20 microns
● Oil capacity: 482 g (17 oz)
Fitting size: Thread size
2
● 1/2
-16 ACME
Revision: May 2004 2003 Altima
MTC-14
PREPARATION
Commercial Service Tools
Tool name Description
(J-41810-NI)
Refrigerant identifier equipment(R-134a)
RJIA0197E
Power tool Loosening bolts and nuts
PBIC0190E
(J-44614)
Clutch disc holding tool
For checks refrigerant purity and for
system contamination
Clutch disc holding tool
EJS001EO
A
B
C
D
E
F
G
H
WHA230
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MTC
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Revision: May 2004 2003 Altima
MTC-15
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM PFP:KA990 Refrigeration Cycle
EJS001EP
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser, the liquid tank,
through the evap ora tor, and ba ck to the compr esso r. The refri ger ant ev apor atio n thro ugh the e vapor at or coil is
controlled by an externally equalized expansion valve, located inside the evaporator case.
REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor
The refrigerant system is prot ected against excessively high or low pressures by the refrigerant pr essure sensor , l oc at ed on t he co nd enser. I f th e s ys tem p r ess ure r ises ab ov e o r fal ls be lo w t he sp ecif ic at ion s, t he ref ri ge rant pressure sens or detec ts the pressu re inside the refr igerant li ne and sen ds the vo ltage signa l to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high pressure side
2
detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm
(1.22 kg/cm
2
, 17.4 psi).
, 398 psi) or below about 120 kPa
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 3,727 kPa (38 kg/
2
, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
cm
the atmosphere.
LJIA0015E
Revision: May 2004 2003 Altima
MTC-16
REFRIGERATION SYSTEM
Component Layout
EJS001EQ
A
B
C
D
E
F
G
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LJIA0011E
Revision: May 2004 2003 Altima
MTC-17
LUBRICANT
LUBRICANT PFP:KLG00 Maintenance of Lubricant Quantity in Compressor
The lubricant in the c ompressor circulates thro ugh the syst em with the refrig erant. Add lubr icant to compre ssor when repl ac in g an y c omp on en t or a f te r a la rge r e fri ge ran t le ak ag e h as occu r red . It is im po rtant to main tain
the specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:
● Lack of lubricant: May lead to a seized com pressor
● Excessive lubricant: Inadequate cooling (thermal exchange interference)
EJS001ER
LUBRICANT
Name: Nissan A/C System Lubricant Type DH-PS or equivalent
Part number: KLH00-PAGS0
CHECKING AND ADJUSTING
Adjust the lubricant quantity according to the test group shown below.
1. LUBRICANT RETURN OPERATION
Can lubricant return op era tio n be perfo rmed?
● A/C system works properly.
● There is no evidence of a large amount of lubricant leakage.
Yes or No
Yes >> GO TO 2.
No >> GO TO 3.
2. PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS
1. Start engine, and set the following conditions:
– Test condition
Engine speed: Idling to 1,200 rpm
A/C switch: ON
Blower speed : Max. position
Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).]
Intake position: Recirculation (REC)
2. Perform lubricant return operatio n for about 10 minu tes.
3. Stop engine.
CAUTION:
If excessive lubricant leakage is noted, do not perform the lubricant return operation.
>> GO TO 3.
3. CHECK COMPRESSOR
Should the compressor be replaced?
Yes or No
Yes >> GO TO MTC-19, "Lubricant Adjustment Procedure for Compressor Replacement" .
No >> GO TO 4.
4. CHECK ANY PART
Is there any part to be replaced? (Evaporator, condenser, liquid tank or in c ase there is evidence of a large
amount of lubricant leakage.)
Yes or No
Yes >> GO TO MTC-19, "Lubricant Adjusting Procedure for Component Replacement Except Compres-
sor" .
No >> Carry out the A/C performance test.
Revision: May 2004 2003 Altima
MTC-18
LUBRICANT
Lubricant Adjusting Procedure for Component Replacement Except Compressor
After replacing any of the foll ow in g ma jo r com po ne nts, add the co rrec t am ount of lubricant to the system.
Amount of lubricant to be added
A
Lubricant to be added to
Part replaced
m (US fl oz, Imp fl oz)
Evaporator 75 (2.5, 2.6) —
Condenser 75 (2.5, 2.6) —
Liquid tank 5 (0.2, 0.2)
In case of refrigerant leak
● *1: If refrigerant leak is small, no addi tion of lub rican t is needed.
system
Amount of lubricant
30 (1.0, 1.1) Large leak
— Small leak *1
Remarks
Add if compressor is not
replaced.
Lubricant Adjustment Procedure for Compressor Replacement
1. Before connect ing recovery/re cycling e quipment to ve hicle, che ck recovery/re cycling equi pment gaug es.
No refrigerant pressure should be displayed. If OK, recover refrigerant from equipment lines.
2. Confirm refrigerant purity in supply tank using recovery/recycling equipment and refrigerant identifier. If
NG, refer to MTC-3, "
3. Connect recovery/recycling equipment to vehicle. Confirm refrigerant purity in vehicle A/C system using
recovery/recyclin g eq ui pm en t and refrigerant ide nt ifi er. If NG, refer to MTC-3, "
.
4. Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure lubricant discharged into
the recovery/recycling equipment.
5. Drain the lubricant from the “old” (removed) compressor into a graduated container and recover the
amount of lubricant dra ine d.
6. Drain the lubrica nt from the “new” compressor into a separate, clean container.
7. Measure an amount of new lubricant installed equal to amount drained from “old” compressor. Add this
lubricant to “new” compressor through the suct io n po rt ope ni ng .
8. Measure an am ount o f n ew l ub ric an t equa l t o t he a mou nt re cov er ed d ur i ng di sc ha rgi ng . Ad d t hi s l ubr i can t
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 lubricant
at this time.
Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of lubricant if only replacing the compressor.
Contaminated Refrigerant" .
Contaminated Refrig erant"
B
C
D
E
F
G
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Revision: May 2004 2003 Altima
MTC-19
M
LUBRICANT
RHA065DD
Revision: May 2004 2003 Altima
MTC-20
AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL PFP:27500
Control Operation
EJS001ES
A
B
C
D
E
F
WJIA0133E
FAN CONTROL DIAL
This dial turn s the fan ON and OFF, and controls fan speed.
AIR CONTROL DIAL
This dial allows control of the outlet air flow.
In , or mode, the intake door is set to "FRESH".
The compresso r turns on when th e dial is moved to "MAX A/C" or .
TEMPERATURE CONTROL DIAL
This dial allows adjustm e nt of the temperature of the outlet air.
RECIRCULATION (REC) SWITCH
OFF position: Outside air is drawn into the passenger compartment.
ON position: Interior air is recirculated inside the vehicle. The indicator lamp will also ligh t.
Recirculation is canceled when , or is selected, and resumes when another mode is chosen.
If the refrigerant pressure sensor input signal is high, recirculation is canceled, when , and mode is
selected.
AIR CONDITIONER (A/C) SWITCH
The air conditione r switch co ntrols the A/ C system . When the swi tch is depre ssed with th e fan ON, t he compressor will turn ON. The indicator lamp will also light.
The air conditioner cooling function operates only when the engine is running.
G
H
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Revision: May 2004 2003 Altima
MTC-21
AIR CONDITIONER CONTROL
Discharge Air Flow
EJS001ET
WJIA0016E
Revision: May 2004 2003 Altima
MTC-22
AIR CONDITIONER CONTROL
System Description
SWITCHES AND THEIR CONTROL FUNCTION
EJS001EU
A
B
C
D
E
F
G
H
WJIA0369E
CAN Communication System Description
EJS001EV
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during opera tion (not independent). In CA N communication, cont rol units are connected with 2
communicatio n lines ( CAN H lin e, CAN L li ne) al lowi ng a high rate of in forma tio n trans missi on wi th less w iring .
Each control unit transmits/receives data but selectively reads required data only.
FOR TCS MODELS
System diagram
LKIA0015E
Input/output signal chart
T: Transmit R: Receive
COMBINA-
Signals ECM TCM
Engine speed signal T R R
Engine coolant temperature signal T R
TION
METER
BCM
ABS/TCS
control unit
IPDM E/R
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Revision: May 2004 2003 Altima
MTC-23
AIR CONDITIONER CONTROL
COMBINA-
Signals ECM TCM
Accelerator pedal position signal T
Fuel consumption monitor signal T R
A/T warning lamp signal T R
A/T position indicator signal R T R
ABS operation signal R T
TCS operation signal R R T
Air conditioner switch signal R T
Air conditioner compressor signal R T
A/C compressor request signal T R
Cooling fan motor operation signal R T
Cooling fan speed request signal T R
Position lights request R T R
Position lights status R T
Low beam request TR
Low beam status R R T
High beam request R T R
High beam status R R T
Front fog lights request T R
Front fog light status R T
OD cancel switch signal R T R
Brake switch signal R T
Vehicle speed signal
Oil pressure switch R T
Sleep request1 R T
Sleep request2 TR
N range switch signal R T
P range switch signal R T
Seat belt buckle switch signal T R
Door switch signal R T R
Tail lamp request R T R
Turn indicator signal R T
Buzzer output signal R T
Trunk switch signal R T
ASCD main switch signal T R
ASCD cruise signal T R
Wiper operation RT
Wiper stop position signal R T
Rear window defogger switch signal T R
Rear window defogger control sig-
nal
RT
RTR
RRT
TION
METER
BCM
(R range only)
R
ABS/TCS
control unit
R
IPDM E/R
Revision: May 2004 2003 Altima
MTC-24
AIR CONDITIONER CONTROL
FOR A/T MODELS
System diagram
LKIA0017E
Input/output signal chart
T: Transmit R: Receive
Signals ECM TCM
Engine speed signal T R
Engine coolant temperature signal T R
Accelerator pedal position signal T R
Fuel consumption monitor signal T R
A/T warning lamp signal T R
A/T position indicator signal R T R
Air conditioner switch signal R T
Air conditioner compressor signal R T
A/C compressor request signal T R
Blower fan switch signal
Cooling fan motor operation signal R T
Cooling fan speed request signal T R
Position lights request R T R
Position lights status RT
Low beam request TR
Low beam status R R T
High beam request R T R
High beam status R R T
Front fog lights request TR
Front fog light status RT
OD cancel switch signal R T R
Brake switch signal R T
Vehicle speed signal
Oil pressure switch R T
Sleep request1 R T
Sleep request2 TR
N range switch signal R T
P range switch signal R T
Seat belt buckle switch signal T R
Door switch signal R T R
(QR25DE)
R
RT
RTR
COMBINATION
METER
BCM IPDM E/R
(R range only)
R
T
MTC
A
B
C
D
E
F
G
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Revision: May 2004 2003 Altima
MTC-25
AIR CONDITIONER CONTROL
Signals ECM TCM
Tail lamp request R T R
Turn indicator signal R T
Buzzer output signal R T
Trunk switch signal R T
ASCD main switch signal T R
ASCD cruise signal T R
Wiper operation RT
Wiper stop position signal RT
Rear window defogger switch signal T R
Rear window defogger control signal R R T
COMBINATION
METER
BCM IPDM E/R
FOR M/T MODELS
System diagram
LKIA0018E
Input/output signal chart
T: Transmit R: Receive
Signals ECM
Engine speed signal T
Engine coolant temperature signal T
Fuel consumption monitor signal T
Air conditioner switch signal R T
Air conditioner compressor signal R T
A/C compressor request signal T R
Blower fan switch signal
Cooling fan motor operation signal R T
Cooling fan speed request signal T R
Position lights request R T R
Position lights status RT
Low beam request TR
Low beam status R R T
High beam request R T R
High beam status R R T
Front fog lights request TR
Front fog light status RT
Vehicle speed signal R T
Oil pressure switch R T
(QR25DE)
R
COMBINATION
METER
BCM IPDM E/R
T
Revision: May 2004 2003 Altima
MTC-26
AIR CONDITIONER CONTROL
Signals ECM
Sleep request1 R T
Sleep request2 TR
Seat belt buckle switch signal T R
Door switch signal R T R
Tail lamp request R T R
Turn indicator signal R T
Buzzer output signal R T
Trunk switch signal R T
ASCD main switch signal T R
ASCD cruise signal T R
Wiper operation RT
Wiper stop position signal RT
Rear window defogger switch signal T R
Rear window defogger control signal R R T
COMBINATION
METER
BCM IPDM E/R
A
B
C
D
E
F
G
H
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Revision: May 2004 2003 Altima
MTC-27
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS PFP:00004 How to Perform Trouble Diagnoses for Quick and Accurate Repair
WORK FLOW
SHA900E
*1: MTC-38, "Operational Check"
SYMPTOM TABLE
Symptom Referen ce Page
● A/C system does not come on. ● Go to Trouble Diagnosis Procedure for A/C system. MTC-40
● Air outlet does not change.
● Mode door motor does not operate nor-
mally.
● Air mix door does not change. ● Go to Trouble Diagnosis Procedure for Air Mix Door. MTC-45
● Intake door does not change.
● Intake door motor does not operate nor-
mally.
● Blower motor operation is malfunctioning. ● Go to Trouble Diagnosis Procedure for Blower Motor. MTC-49
● Magnet clutch does not engage. ● Go to Trouble Diagnosis Procedure for Magnet Clutch. MTC-54
● Insufficient cooli n g. ● Go to Trouble Diagnosis Procedure for Insufficient Cooling. MTC-58
● Insufficient heating. ● Go to Trouble Diagnosis Procedure for Insufficient Heating. MTC-63
● Noise. ● Go to Trouble Diagnosis Procedure for Noise. MTC-64
● Go to Trouble Diagnosis Procedure for Mode Door Motor. MTC-42
● Go to Trouble Diagnosis Procedure for Intake Door Motor. MTC-46
EJS001EW
Revision: May 2004 2003 Altima
MTC-28
TROUBLE DIAGNOSIS
Component Parts and Harness Connector Location
ENGINE COMPARTMENT
QR25DE Models
EJS001EX
A
B
C
D
E
F
G
H
WJIA0136E
I
MTC
K
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Revision: May 2004 2003 Altima
MTC-29
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