Nissan Frontier 2007 Owner's Manual
J AIR CONDITIONER
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SECTION MTC
MANUA L AIR COND ITIO NER
CONTENTS
PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ..................................................................4
Precautions for Working with HFC-134a (R-134a) ..... 4
Contamin at e d Refrigerant ........................................ 4
General Refrigerant Precautions .............................. 5
Precautions for Leak Detection Dye ......................... 5
A/C Identification Label ............................................ 5
Precautions for Refrigerant Connection ................... 6
FEATURE S OF NEW TYPE REFRIGER ANT
CONNECTION ......................................................6
O-RING AND REFRIGERANT CONNECTION ..... 7
Precaution s fo r Se r vicing Compressor ..................... 9
Precautions for Service Equipment .......................... 9
RECOVERY/RECYCLING EQUIPME NT ....... ....... 9
ELECTRONIC LEAK DETEC TOR . ....................... 9
V ACUUM PUMP ...... ...................................... ..... 10
MANIFOLD GAUGE SET .................................... 10
SERVICE HOSES ............................................... 10
SERVICE COUPLERS .........................................11
REFRIGERANT WEIGHT SCALE . ......................11
CHARGING CYLINDER ................. ......................11
PREPARATION ......................................................... 12
Special Service Tools ............................................. 12
HFC-134a (R-134a) Service Tools and Equipment ... 12
Commercial Service Tools ...................................... 15
REFRIGERATION SYSTEM ..................................... 16
Refrigeran t Cycle ................................................... 16
REFRIGERANT FLOW .......... ............................. 16
FREEZE PROTECTION ...... ............................... 16
Refrigeran t System Protectio n .. ............................. 16
REFRIGERANT PRESSURE SENSOR ............. 16
PRESSURE RELIEF VALVE ............................... 16
Component Layout ................................................. 17
OIL ............................................................................ 19
Maintenance of Oil Quantity in Compressor .......... 19
OIL ...................................................................... 19
CHECKING AND ADJUSTING ........................... 19
AIR CONDITIONER CONTROL ............................... 22
Description ..............................................................22
Operation ................................................................22
AIR MIX DOOR CONTROL .................................22
BLOWER SPEED CONTROL .............................22
INTAKE DOORS CONTROL ...............................22
MODE DOOR CONTROL ......... ..........................22
DEFROSTER DOOR CONTROL ...... ......... .........22
MAGNET CLUTCH CONTROL ...........................22
Description o f Control System ................................24
Control Operati o n ......... ..........................................2 5
TEMPERA TURE CONTROL DIAL (TEMPERA-
TURE CONTROL) ...............................................25
RECIRCULATION () SWITCH .............................25
DEFROSTER SWITCH ...... ........................ .........25
REAR WINDOW DEFOGGER SWITCH (IF
EQUIPPED) .........................................................25
OFF SWITCH (BLOWER SPEED SET TO 0) ..... 25
A/C SWITCH (IF EQUIPPED) ............................. 25
MODE DIAL .........................................................25
BLOWER CONTROL DIAL .................................2 5
Discharge Air Flow .................................................26
............................................................................26
DISCHARGE AIR FLOW .....................................26
System Description .................................................27
SWITCHES AND THEIR CONTROL FUNCTION ...27
TROUBLE DIAGNOSIS ............................................28
CONSULT-II Function (BCM) .................................28
CONSULT-II START PROCEDURE ......... ...........28
DA TA MONITOR ..................... ............................28
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ........................ ..............................28
WORK FLOW ......................................................2 8
SYMPTOM TABLE ..............................................28
Component Parts and Harness Connector Location ...30
ENGINE COMPARTMENT ..................................30
PASSENGER COMPARTMENT .........................31
Schematic ...............................................................32
Wiring Diagram — HEATER — ..............................33
Wiring Diagram — A/C,M — ...................................35
Front Air Control T erminals and Reference Values ...39
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FRONT AIR CONTROL CONNECTOR TERMI-
NAL LAYO UT ...................................................... 39
TERMINALS AND REFERENCE V ALUES FOR
FRONT AIR CONTROL ....................................... 39
Operatio n al Check .................................... ..............41
CHECKING BLOWER ......................................... 41
CHECKING DISCHARGE AIR ........... .................41
CHECKING TEMPERATURE DECREASE .........41
CHECKING TEMPERATURE INCREASE ..........41
CHECK A/C SWITCH (IF EQUI PPED) ................41
Power Supply and Ground Circuit for Front Air Con-
trol ...........................................................................42
INSPECTION FLOW ...........................................42
COMPONENT DESCRIPTION ................ ............43
COMPONENT DESCRIPTION ................ ............43
DIAGNOSTIC PROCEDURE FOR HEATER/A/C
SYSTEM (IF EQUIPPED) ....................................43
Mode Door Motor Circu it .. ......................................45
INSPECTION FLOW ...........................................45
SYSTEM DESCRIPTION ....................................46
COMPONENT DESCRIPTION ................ ............46
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR .................................. .................47
Air Mix Door Motor Cir cu it ......................................49
INSPECTION FLOW ...........................................49
SYSTEM DESCRIPTION ....................................50
COMPONENT DESCRIPTION ................ ............50
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR .................................. .................51
Intake Door Motor Circuit ........................................53
INSPECTION FLOW ...........................................53
SYSTEM DESCRIPTION ....................................54
COMPONENT DESCRIPTION ................ ............54
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR .................................. .................55
Front Blower Moto r Circuit ......................................57
INSPECTION FLOW ...........................................57
SYSTEM DESCRIPTION ....................................58
COMPONENT DESCRIPTION ................ ............58
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ...............................................................59
COMPONENT INSPECTION .............................. 63
Magnet Clutch Circuit .............................................65
INSPECTION FLOW ...........................................65
SYSTEM DESCRIPTION ....................................66
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH ..............................................................66
Insufficient Cooli n g ........... ......................................70
INSPECTION FLOW ...........................................70
PERFORMANCE TEST DIAGNOSES ................72
PERFORMANCE CHART ........... ........................74
TROUBLE DIAGNOSES FOR UNUSUAL PRES-
SURE ...................................................................75
Insufficient Heating .................................................78
INSPECTION FLOW ............................................78
Noise .......................................................................80
INSPECTION FLOW ............................................80
Intake Sensor Circuit ...............................................82
COMPONENT DESCRIPTION ............................82
DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
SOR .....................................................................82
COMPONENT INSPECTION ...............................83
CONTROL UNIT ........................................ ................84
Removal and Installation .........................................84
FRONT AIR CONTROL .......................................84
INTAKE SENSOR ..................... .................................85
Removal and Installation .........................................85
REMOVAL ............................................................85
INSTALLATION ....................................................85
BLOWER MOTOR ........... ...................................... ....86
Components ............................................................86
Removal and Installation .........................................86
REMOVAL ............................................................86
INSTALLATION ....................................................86
IN-CABIN MICROFILTER ..........................................87
Removal and Installation .........................................87
FUNCTION ..........................................................87
REPLACEMENT TIMING ....................................87
REPLACEMENT PROCEDURE ..........................87
HEATER & COOLING UNIT ASSEMBLY .................89
Components ............................................................89
Removal and Installation .........................................89
REMOVAL ............................................................89
INSTALLATION ....................................................90
HEATER CORE .......... ...................................... .........91
Components ............................................................91
Removal and Installation .........................................91
REMOVAL ............................................................91
INSTALLATION ....................................................91
INTAKE DOOR MOTOR ....... .....................................92
Removal and Installation .........................................92
REMOVAL ............................................................92
INSTALLATION ....................................................92
MODE DOOR MOTOR ....................................... .......93
Removal and Installation .........................................93
REMOVAL ............................................................93
INSTALLATION ....................................................93
AIR MIX DOOR MOTOR ...........................................94
Components ............................................................94
Removal and Installation .........................................94
REMOVAL ............................................................94
INSTALLATION ....................................................94
FRONT BLOWER MOTOR RESISTO R ....................95
Removal and Installation .........................................95
REMOVAL ............................................................95
INSTALLATION ....................................................95
DUCTS AND GRILLES .............................................96
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MTC-2
Components ........................................................... 96
Removal and Installation ........................................ 97
DEFROSTER NOZZLE ....................................... 97
RH AND LH SIDE DEMISTER DUCTS .............. 98
RH AND LH VENTILATOR DUCTS .................... 98
CENTER VENTILATOR DUCT ........ ................... 98
FLOOR CONNECTOR DUCT ........................ ..... 98
FRONT AND REAR FLOOR DUCTS ................. 98
GRILLES ............................................................. 98
REFRIGERANT LINES ............................................. 99
HFC-134a (R-134a) Service Procedure ................. 99
SETTING OF SERVIC E TOOLS AND EQUIP-
MENT .................................................................. 99
Components ......................................................... 101
Removal and Installation for Compressor ............ 102
COMPONENTS ................................................ 102
REMOVAL ......................................................... 103
INSTALLATION ................................................. 103
Removal and Installation for Compressor Clutch . 104
REMOVAL ......................................................... 104
INSPECTION .................................................... 105
INSTALLATION ................................................. 105
BREAK-IN OPERATION ................................... 107
Removal and Installation for High-pressure Flexible
A/C Hose .............................................................. 107
REMOVAL ......................................................... 107
INSTALLATION ................................................. 107
Removal and Installation for High-pressure A/C
Pipe ...................................................................... 107
REMOVAL ......................................................... 107
INSTALLATION ................................................. 107
Removal and Installation for Low-pressure Flexible
A/C Hose .............................................................. 107
REMOVAL .........................................................107
INSTALLATION .................................................107
Removal and Installation for Low-pressure A/C Pipe .108
REMOVAL .........................................................108
INSTALLATION .................................................108
Removal and Installation for Refrigerant Pressure
Sensor ..................................................................108
REMOVAL .........................................................108
INSTALLATION .................................................108
Removal and Installation for Condenser ..............108
REMOVAL .........................................................108
INSTALLATION .................................................109
Removal and Insta l lation for Evaporator ....... .......110
REMOVAL ..........................................................111
INSTALLATION ..................................................111
Removal and Installation for Expansion Valve ....... 111
REMOVAL ..........................................................111
INSTALLATION .................................................. 111
Checking for Refrigerant Leaks ............................. 111
Checking System for Leaks Using the Fluorescent
Dye Leak Detector .................................................111
Dye Injection .........................................................112
Electronic Refri g e r an t Lea k De te cto r ....................112
PRECAUTIONS FOR HANDLING LEAK
DETECTOR .......................................................112
CHECKING PROCEDURE ...................... .........113
SERVICE DATA AND SPECIFICATIONS (SDS) ....115
Service Data and Specifications (SDS) ................115
COMPRESSOR ................................................115
OIL .....................................................................115
REFRIGERANT .................................................115
ENGINE IDLING SPEED ..................................115
BELT TENSION .................................................115
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PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions fo r Su ppl em ental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSION ER”, used along
with a front sea t belt, h el ps to red uce the ris k or sever ity of injur y to the driv er and f ron t passe nger 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 rend ering the SRS in operative , w hich cou ld increas e t he risk o f pers onal inj ury or deat h
in the event of a collision which w ould result in air bag inflation, all maintena nce must be performed by an authorized NISSAN/INFINITI dealer.
● Improper main tenance, including in correct removal and installation of the SRS, can lead to per-
sonal injury caused by un intenti onal act iva tion of t he syste m. Fo r removal o f Spiral Ca ble and Air
Bag Modu le, see the SRS section.
● Do not use electrical t est equipme nt on any circu it related to the SR S unless ins tructed to in this
Service Manual. SR S wiring harnesses can be identified by yellow and /or orange harnesses or
harness connectors.
EJS003OA
Precautions fo r Working w ith HFC - 134a ( R- 134a) EJS003OB
WARNING:
● CFC-12 (R-12 ) refrig eran t and HFC- 134 a (R- 134a ) refrig erant a re not co mpatible. If the ref riger ants
are mixed compressor failure is likely to occur. Refer MTC-4, "
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant
Recovery/Recycling Recharging equipment and Refrigerant Identifier.
● Use only s pec ified oi l for the HF C-134a ( R-134a ) A/C sy stem an d HF C -134a ( R-13 4a) co mpo nents.
If oil other than that specified is used, co mpressor 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 refrigeran t components from a vehicle, imme diately cap (seal) the componen t to
minimize the entry of moisture from the atmosphere.
– When installing refr igerant components to a vehi cle, do not remove the caps ( unseal) until just
before connect ing t he co m pone nts. Connect all refri gerant lo o p com ponen ts as qu ickly as poss ible to minim ize the entry of moisture into system.
– Only use the s pecified oil from a seal ed container. Immediately reseal containers o f 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 SAE J2209 [HFC-134a (R134a) recovery equipment]. If accidental system discharge occurs, ventilate work area before
resuming servic e. Addit ional he alth and safety in formation m ay be o btained from refrigerant and
oil manufac turers.
– Do not allow oil, Genuine NISSAN A/C System Oil Type R to come in contact with styrofoam parts.
Damage may result.
Contaminated Refrigerant" . To
Contaminated Refrigerant EJS003OC
If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
● Explain to the cus tomer that environmental r egulations prohibit the releas e of contaminated refriger ant
into the atmosphere.
● Explain that r ecov ery of the co ntaminated r efrige rant c ou ld dam age y our ser vice e qui pme nt a nd refr iger -
ant supply.
● Suggest the c ustome r retur n t he veh icle to the loca tio n of previou s se rvice wh ere the co ntamination may
have occurred.
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MTC-4
PRECAUTIONS
● If you choose to perform the repair, recover the refrigerant using only dedicated e qui p me nt an d c ontain-
ers. Do not re cover contaminated refrigerant into y our existing se rvice equipmen t. If you r facility
does not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available service. This refrigerant m ust be dispos ed of in acco rdance with al l federal and loc al regulations . In
addition, replacement of all refrigerant system components on the vehicle is recom mended.
● If the vehicle is within the warranty period, the air conditi oner warranty is void. Please con tact NISSAN
Customer Affairs for further assistance.
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General Refrig er ant Pr ecaut i ons EJS003OD
WARNING:
● Do not release refrigerant into the air. Use approved recovery/ recycling eq uipment to cap ture the
refrigerant every time an air co nditioning system is discharged.
● Always wear eye and hand prot ection (gog gles and glo ves) wh en working w ith any refrige rant or
air conditioning system .
● Do not store or heat refrigerant containers above 52°C (125°F).
● Do not heat a refrigerant container with an op en flame; if container warm ing is required , place t he
bottom of the container in a warm pail of water.
● Do not intentio nally drop, puncture, or incinerate refrigerant containers.
● Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
● Refrigerant will disp lace oxygen, therefore b e certain to work in well ventila ted areas to prevent
suffocation.
● Do not pressure test or leak test HFC-13 4a (R-134a) service equ ipment and/or veh icle air condi-
tioning sys tems with com pressed air durin g repair. Some mixtures of air an d HFC-13 4a (R-134a)
have been shown to be comb ustible at eleva ted pressu res. These m ixtures, if igni ted, may cause
injury or p rop ert y da mage . Addi ti on al h ea lt h a nd s afe t y informat ion m ay be o btained from r efr i ger ant manufacturers.
Precautions f or Leak Detection Dye EJS003OE
● The A/C system co nta ins a fl uor escent lea k detect ion dye used f or loca tin g ref rigeran t le aks. An ult r aviole t
(UV) lamp is required to illuminate the dye when inspecting for leaks.
● Always wear fluorescence enhancing UV safety goggles to protect your eyes and enhance the visibility of
the fluorescent dye.
● The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluo-
rescent dye leak detec tor should be used in conjunction with an electroni c refrigerant le ak detector (J-
41995).
● For your safety and the custo mer's satis faction, read and follo w all manufac turer's op erating ins tructions
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 rema ining dye from the leak area after repairs are complete to avoid a misd iagnosis
during a future s ervice.
● Do not allow dye to come into contact wit h painted body panels or interior com ponents. If dye is spilled,
clean immediately with the approved dye cleaner. Fluorescent dye left on a surface for an extended period
of time cannot be removed .
● Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.).
● Do not use more than one refrigerant dye bottle (1/4 ounce / 7.4 cc) per A/C system.
● Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12) A /C systems are different. Do not use
HFC-134a (R- 134a) leak dete ction dye in C FC-12 (R-12) A/C systems or CFC-12 (R-12) leak detec tion
dye in HFC-134a (R-134a) A/C systems or A/C system damage may result.
● The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure
occurs.
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A/C Identification Label EJS003OF
Vehicles with factory installed fluorescent dye have an identification label on the underside of hood.
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PRECAUTIONS
Precautions fo r Refrigerant Connecti on EJS003OG
A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.
● Expansion valve to cooling unit
● Evaporator pipes to evapora tor (inside cooling unit)
● Refrigerant pressu re sens or
FEATURES OF NEW TYPE REFRIGERANT CONNECTION
● The O-ring has been relocated. It has also been provided with a groove for proper installation. This
reduces the possibility of the O-ring being caught in, or damaged by, the mating part. The sealing direction
of the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing
characteristics.
● The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facil-
itating piping connections.
SHA815E
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MTC-6
PRECAUTIONS
O-RING AND REFRIGERANT CONNECTION
A/C Compressor and Condenser
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WJIA1481E
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PRECAUTIONS
1. High-pressure service valve 2. Clip 3. High-pressure A/C pipe
4. Refrigerant pressure sensor 5. Condenser 6. Compressor shaft seal
7. High-pressure flexible A/C hose 8. Low-pressure flexible A/C hose 9. Low-pressure service valve
10. Low-pressure A/C pipe 11. Expansion valve 12. A/C drain hose
CAUTION:
The new and form er refrigerant connections us e different O-ring configuration s. 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)
WARNING:
Make sure all refrigerant is discharged into the recycling equ ipment and the pressure in the syste 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 com presso r is rem oved , store it in t he sa me p ositi on a s i t is w hen mou nted 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 opera-
tion. Do not remove the seal caps of pipes and other com ponents until just before required f or
connection.
● Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming in side A/C components.
● Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
● Always replace used O-rings.
● When connect ing tube, apply oil to circle of the O-rings shown in illu stration. Be careful not t o
apply oil to threaded portion.
Oil name: Genuine NISS AN A/C System Oil Type R or equivalent.
● 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 correct ly.
O-ring
size
12
16
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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)
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MTC-8
PRECAUTIONS
● After connecting line, co ndu ct leak tes t and make sure that there is no leakag e from conn ections.
When the refrigerant leaking point is found, disconnect that line and replace the O-ring. Then
tighten connections of seal seat to the specified torque.
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RHA861F
Precautions for Servicing Compressor EJS003OH
● 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, "
● Keep friction surfaces between clutch and pulley clean. If the surface is contaminated with oil,
Maintenance of Oil Quantity in Compressor" .
wipe it off by using a clean waste cloth moistened with thinner.
● After compressor service opera tion , turn the compre sso r shaft by hand m ore than 5 turn s in both
directions. Th is 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 MTC-104, "
Removal and Installation for Compressor Clutch" .
Precautions for Service Equipment EJS003OI
RECOVERY/REC YCLING EQUIPMENT
Follow the manu fac turer's instruc tions for machi ne ope ration and mach ine mainten ance. N ev er introduc e an y
refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operati on and tester maintenance.
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PRECAUTIONS
VACUUM PUMP
The oil contained inside the vacuum pump is not compatible with the
specified oil for HFC -134a (R-134a) A/C s ystems. The vent side of
the vacuum pump is exposed to atmos pheric 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 pum ps have a manual isola tor valve as part of
the pump. C lose this valv e to isolate th e service hose fr om the
pump.
● For pumps without an isolator, use a hose equipped with a man-
ual shut-off valve near the pump end. Clos e the valve to isolate
the hose from the pump.
● If the hose has an automatic shut o ff valve, disconnect the hose
from the pump : as long as the hose is conne cted, the valve is
open and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close
under a no vacuum cond ition. Such valves may restric t the pump's
ability to pull a deep vacuum and are not rec ommended.
MANIFOLD GAUGE SET
Be certain that the gauge fac e indicates HFC -134a (R-134a). Mak e
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 autom atic) near the end of the hoses
opposite the manifold gauge.
RHA270D
SHA533D
RHA272D
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MTC-10
PRECAUTIONS
SERVICE COU PLE RS
Never attempt to connect HFC-134a (R-13 4a) service couplers to a
CFC-12 (R-12) A/C system . The HFC-134a (R-134a) cou plers 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
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RHA273D
REFRIGERANT W EIGHT SCALE
Verify that no refrigerant other than HFC134a (R-134a) and specified
oils have been u sed with the scale . If the scale controls refrige rant
flow electronically, the hose fitting must be 1/2”-16 ACME.
RHA274D
CHARGING CYLINDER
Using a charging cylinde r is not recommended. Refrige rant may be vented into air from cylinder's top valve
when filling the cylinder w ith refrigerant. Also, the acc uracy of the cy linder is gener ally less than that of an
electronic scale or of quality recycle/recharge equipment.
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PREPARATION
PREPARATION PFP:00002 Special Serv ice Tools EJS003OK
The actual shapes of Kent-Moore tools may differ from those of special servi ce tools illustrated here.
Tool number
(Ken t-Moore No.)
Tool name
—
(J-38873-A)
Pulley installer
LHA171
KV99233130
(J-29884)
Pulley puller
LHA172
Description
Installing pulley
Removing pulley
HFC-134a (R-134a) Service Tools and Equipment EJS003OL
Never mix HFC-1 34a (R-134a) refrigerant and /or the specified oil with CFC-12 (R-12) refrigerant and/or the
oil.
Separate and non-interchangeable service equipment must be used for ha ndling each type of refrigerant/oil.
Refrigerant c ontainer fittings, servi ce hose fittings a nd service equipment fittings (equipment which handles
refrigerant and /or oil) are different between C FC-12 (R-12) and H FC-134a (R-134a). Thi s is to avoid mixed
use of the refrigerants/oil.
Adapters that convert one size fitting to another must nev er be used refrigera nt/oil contamination wil l occur
and compressor malfunction will result.
Tool number
(Kent-Moore No.)
Tool name
HFC-134a (R-134a)
(—)
Refrigerant
S-NT196
—
(—)
NISSAN A/C System Oil
Type R
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 R
Application: HFC-134a (R-134a) vane
rotary compressors (NISSAN only)
Lubricity: 40 m (1.4 US fl oz, 1.4 Imp
fl oz)
S-NT197
KV991J0130
(ACR2005-NI)
ACR5 A/C Service Center
WJIA0293E
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Refrigerant Recovery and Recycling
and Recharging
PREPARATION
Tool number
(Ken t-Moore No.)
Tool name
—
(J-41995)
Electronic refrigerant leak detector
—
(J-43926)
Refrigerant dye leak de tecti on kit
Kit includes:
(J-42220)
UV lamp and UV safety goggles
(J-41459)
Refrigerant dye i nject or
(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye (box of 24, 1/4
ounce bottles)
(J-43872)
Refrigerant dye cleaner
—
(J-42220)
Fluorescent dye leak detector
—
(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(box of 24, 1/4 ounce bottles)
SHA438F
AHA281A
ZHA200H
Description
Power supply:
● DC 12V (battery terminal)
Power supply:
● DC 12V (battery terminal)
Power supply:
● DC 12V (battery terminal)
For checking refrigerant leak when fluorescent dy e is inst alled i n A/C syst em.
Includes: UV lamp and UV safety goggles
Applicati on: 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
char ging system with dye.)
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SHA439F
—
(J-41459)
HFC-134a (R-134a) Refrigerant
dye injector
Use with J-4 1447, 1/4 ou nce bottle
SHA440F
—
(J-43872)
Refrigerant dye cleaner
SHA441F
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For injecti ng 1/ 4 oun ce of fluo r es cent
leak detection dye into A/C system.
For cleaning dye spills.
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PREPARATION
Tool number
(Kent-Moore No.)
Tool name
—
(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
Description
Identification:
● The gauge face indicates R-134a.
Fitting size-Thread size
● 1/2”-16 ACME
RJIA0196E
Hose color:
● Low side hose: Blue w it h black st ripe
● High side hose: Red with black s trip e
● 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 fitti ng is op tion al o r perma -
nently attached.
—
(J-39699)
Refrigerant weight scale
—
(J-39649)
Vacuum pump
(Including the isolator valve)
S-NT202
For measuring of refrigerant
Fitti ng size-Thread size
● 1/2”-16 ACME
S-NT200
Capacity:
● Air displacement: 4 CFM
● Micron rating: 20 micron s
● Oil capacity: 482 g (17 oz)
Fitting size-Thread size
● 1/2”-16 ACME
S-NT203
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PREPARATION
Commercial Service Tools EJS003OM
Tool name Description
(J-41810-NI)
Refrigerant identifie r equipment (R 134a)
RJIA0197E
Power tool Loosening bolts and nuts
For checking refrigerant purity and
system contamination
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(J-44614)
Clutch disc holding tool
PBIC0190E
WHA230
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Clutch disc holding tool
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REFRIG ERATION SYSTEM
REFRIGERATION SYSTEM PFP:KA990 Refrigerant Cycle EJS003ON
WJIA1482E
REFRIGERANT FLOW
The refrigerant flows in the standard pattern. Refrigerant flows through the compressor, condenser, liquid tank,
expansion valve, evaporator, and back to the compressor. The refrigerant evaporation through the evaporator
coil is controll ed by an externally equalized expansion valve, l ocated inside the evaporator case.
FREEZE PROTECTION
The compressor cycles on an d off to maintain the e va porator temp eratur e withi n a spe cified r ange . When the
evaporator coil tem perature falls below a specifi ed point, the intake sensor interrup ts the compressor operation. When the evaporator coil temperature rises above the specification, the intake sensor allows compressor
operation.
Refrigerant System Protection EJS003OO
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 pressur e sensor dete cts the pressur e inside th e refrigerant line and sen ds 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 pr essure sensor is over about 2,746 kPa (28 kg/cm
2
about 120 kPa (1.22 kg/cm
, 17.4 psi).
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure reli ef valve, located in the re ar 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/
2
, 433.6 psi)], the releas e port on the pressure relief valv e automatically opens an d releases refrigerant
cm
into the atmosphere.
, 398 psi), or below
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REFR IGERATION SYSTE M
Component Layout EJS003OP
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WJIA1260E
1. Defroster nozzle 2. LH side demister duct 3. LH ventilator duct
4. RH side demister duct 5. RH ventilator duct 6. Center ventilator duct
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REFRIG ERATION SYSTEM
7. Front heater and cooling unit assembly 8. Floor connector duct grilles 9. Floor connector duct
10. Front floor ducts 11. Rear floor ducts
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OIL
OIL PFP:KLG00
Maintenance of Oil Qua ntit y in Co m pr essor EJS003OQ
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 R or equivalent
CHECKI NG AN D ADJ U ST ING
CAUTION:
If excessive oil leakage is noted, do no t perform the oil return operation.
Start the engine and set the following conditions:
Test Condition
● Engine speed: Idling to 1,200 rpm
● A/C switch: On
● Blower fan speed: Max. position
● Temp. 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.
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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
Evapora tor 75 (2.5, 2.6) —
Conden ser 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
Oil Adjustment Procedure for Compressor Replacement
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 mea su ring cu ps 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 equ ipment and refrigerant identifier. If NG, refer to MTC-4, "
Contaminated Refrigerant" .
3. Confirm refrigerant purity in vehicle A/C s ystem using recover y/recycling equipment and refrigerant identifier. If NG, refer to MTC-4, "
Contaminated Refrigerant" .
4. Discharge refr igerant into the refr igerant recovery/re cycling equipment. Me asure oil discharge d into the
recovery/recycling equipment.
5. Drain the oil from the “ old” (remov ed) com pressor into a grad uated contai ner and re cover the am ount of
oil drained.
6. Drain the oil from the “new” compressor into a separate, clean container.
7. Measure an am ount of new oil installed eq ual to amount drained fr om “old” compressor. Add this oil to
“new” compressor through the suction port opening.
8. Measure an amo unt of new oil equal to the am ount recovered during dis charging. 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.
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OIL
Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor.
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AIR CONDITIONER CONTROL
AIR COND ITIONER CONTROL PFP:27500 Description EJS003R2
The front air control provides regulation of the vehicle's interior temperature. The system is ba sed on the position of the front air controls te mperature switch selected by the driv er. This is done by utilizing a microcom puter, also referred to as the front air control, which receives input signals from the following two sensors:
● Intake sensor
● PBR (position balanced resistor)
The front air control uses these signals (including the set position of the temperature switch) to control:
● Outlet air volume
● Air temperatu re
● Air distribution
Operation EJS003R3
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 bl ower switch settings.
When blower swi tch is turned, the blowe r motor starts and increases air flow volume each time the blowe r
switch is t urned counterclockwise, and decreases air flow volume each time the blower switch is turned counterclockwise.
INTAKE DOORS CONTROL
The intake doors are controlled by the recirculation switch setting, and the mode (defroster) switch settin g.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode dial.
DEFROSTER DOOR CONTROL
The defroster door is controlled by the mode dial set to defroster.
MAGNET CLUTCH CONTROL
WJIA1629E
When the A/C switch is pressed, or the mode switch is turned to the defroster position, the front air control outputs a compressor ON signal to BCM.
The BCM then sends a compressor ON signal to ECM, via CAN communication line.
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AIR COND ITIONER CONTROL
ECM judges whether compress or can be turned O N, based on ea ch sensor status (re frigerant pressur e sensor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends com pressor ON signal to IPDM E/R, via CAN communication line.
Upon receipt o f compressor ON signal from ECM , IPDM E/R tu rns air conditioner relay ON to operate compressor.
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AIR CONDITIONER CONTROL
Description of Con trol Syst em EJS003Q0
The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.
The relationship of these c omponents is shown in the figure below:
WJIA1495E
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AIR COND ITIONER CONTROL
Control Ope ra tio n EJS003Q1
Front air control
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WJIA1510E
1. Temperature control dial 2. Blower control dial 3. A/C switch (if equipped)
Rear window defogger switch (if
4.
equipped)
5. Recirculation switch 6. Mode dial
TEMPERATURE CONTROL DIAL (TEMPERATURE CONTROL)
Increases or decreases the set temperature.
RECIRCULATION () SWITCH
● When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.
● When REC switch is tur ned OFF, air inlet is set to fresh. REC mode can be re-en tered by pres sing REC
switch again.
● REC switch is not operated w hen DEF switch is turned ON, at the D/F position, or at the floor position.
DEFROSTE R SWIT CH
Positions the a ir ou tlet doo rs to the defros t po sition. Also posi tions the in take door s to the o utside air po sition
and compressor (with A/C) is enabled.
REAR WINDOW DEFOGGER SWITCH (IF EQUIPPED)
When switch is ON, rear window is defogged.
OFF SWITCH (BLOWER SPEED SET TO 0)
The compressor and blower are OFF.
A/C SWITCH (IF EQUIPPED)
The compressor is ON or OFF.
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MODE DIAL
Controls the air discharge outlets.
BLOWER CONTROL DIAL
Manually controls the four blower speeds, and turns blower off and on.
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AIR CONDITIONER CONTROL
Discharge Air Flow EJS003Q2
WJIA1296E
DISCHARGE AIR FLOW
Mode door position
Airflow always present at driver and passenger side demisters
Air outlet/distribution
Vent Foot Defroster
95% 5% —
70% 30% —
20% 55% 25%
15% 50% 35%
7% 15% 78%
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AIR COND ITIONER CONTROL
System Description EJS003Q3
SWITCHES AND THEIR CONTROL FUNCTION
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WJIA1496E
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TROUBL E DIAGNOSI S
TROUBL E DIAGNOSI S PFP:00004 CONSULT-II Function (BCM) EJS003Q6
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
BCM diagnostic
test item
Inspection by part
CONSULT-II START PROCEDURE
Refer to GI-38, "CONSULT-II Start Procedure" .
DATA MONITOR
Display Item List
Monitor item name
“OPERATION OR UNIT”
IGN ON SW “ON/O FF” Displ a ys “ IG N Po si tion (ON)/ OF F, ACC Position (OFF)” st atus as judg ed fr o m ign i ti o n sw i tch si gn 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.
Diagnos ti c mo de Description
Supports inspections and adjustments. Commands are transmitted to the BCM
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 number can be read.
CONFIGURATION Performs BCM configuration read/write functions.
for setting the status suitable for required operation, input/output signals are
received from the BCM and received data is displayed.
Contents
How to Perform Trouble Diagnosis for Quick and Accurate Repair EJS003Q7
WORK FLOW
SHA900E
*1 MTC-41, " Operational Check".
SYMPTOM TABLE
Sympt om Reference Page
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C System. MTC-42
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.
Front blower motor operation is malfunction-
ing.
Go to Trouble Diagnosis Procedure for Mode Door Motor. MTC-45
Go to Trouble Diagnosis Procedure for Air Mix Door Motor. MTC-49
Go to Trouble Diagnosis Procedure for Intake Door Motor. MTC-53
Go to Trouble Diagnosis Procedure for Front Blower Motor. MTC-57
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TROUBL E DIAGNOSI S
Symptom Reference Page
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch. MTC-65
Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling. MTC-70
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating. MTC-78
Noise Go to Trouble Diagnosis Procedure for Noise. MTC-80
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TROUBL E DIAGNOSI S
Component Par ts and Harness Connector Locati on EJS003Q8
ENGINE COM PARTMENT
WJIA1489E
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