Nissan 2002 Altima Owners Manual MTC

2015-10-23

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J AIR CONDITIONER
A

SECTION

MANUAL AIR CONDITIONER

CONTENTS
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER” .................................................................. 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
REFRIGERANT WEIGHT SCALE .......................11
CALIBRATING ACR4 WEIGHT SCALE ...............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

Revision: May 2004

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 DESCRIPTON ..................................... 47
DIAGNOSTIC PROCEDURE .............................. 47

MTC-1

2002 Altima

MTC

CONTROL LINKAGE ADJUSTMENT ................. 48
Blower Motor Circuit ............................................... 49
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
Revision: May 2004

REFRIGERANT LINES .............................................79
HFC-134a (R-134a) Service Procedure ..................79
SETTING OF SERVICE TOOLS AND EQUIPMENT ...................................................................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 and Installation for Low-pressure Flexible
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 HANDLING 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

MTC-2

2002 Altima

PRECAUTIONS
PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”

EJS000Z2

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:
●
To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer.
●
Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
●
Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Precautions for Working with HFC-134a (R-134a)

EJS000Z3

WARNING:
G
●
CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed, compressor failure is likely to occur. Refer to MTC-3, "Contaminated Refrigerant" . To
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant
H
Recovery/Recycling Recharging equipment (ACR4) (J-39500-NI) and Refrigerant Identifier.
●
Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If lubricant other than that specified is used, compressor failure is likely to occur.
I
●
The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The following handling precautions must be observed:
–
When removing refrigerant components from a vehicle, immediately cap (seal) the component to
MTC
minimize the entry of moisture from the atmosphere.
–
When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possible to minimize the entry of moisture into system.
K
–
Only use the specified lubricant from a sealed container. Immediately reseal containers of lubricant. Without proper sealing, lubricant will become moisture saturated and should not be used.
–
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and L
throat. Remove R-134a from the A/C system using certified service 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 M
and safety information may be obtained from refrigerant and lubricant manufacturers.
–
Do not allow lubricant (Nissan A/C System Oil Type DH-PS) to come in contact with styrofoam
parts. Damage may result.

Contaminated Refrigerant

EJS000Z4

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 atmosphere.
●
Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant supply.
●
Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
●
If you choose to perform the repair, recover the refrigerant using only dedicated equipment and containers. 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 available service. This refrigerant must be disposed of in accordance with all federal and local regulations. In
addition, replacement of all refrigerant system components on the vehicle is recommended.
Revision: May 2004

MTC-3

2002 Altima

PRECAUTIONS
●

If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact Nissan Customer Affairs for further assistance.

General Refrigerant Precautions

EJS000Z5

WARNING:
●
Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.
●
Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or
air conditioning system.
●
Do not store or heat refrigerant containers above 52°C (125°F).
●
Do not heat a refrigerant container with an open flame; if container warming is required, place the
bottom of the container in a warm pail of water.
●
Do not intentionally drop, puncture, or incinerate refrigerant containers.
●
Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
●
Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent
suffocation.
●
Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air conditioning systems with compressed air during repair. Some mixtures of air and R-134a have been
shown to be combustible at elevated pressures. These mixtures, if ignited, may cause injury or
property damage. Additional health and safety information may be obtained from refrigerant manufacturers.

Precautions for Leak Detection Dye
●

●

●
●
●

●

EJS000Z6

The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet
(UV) lamp is required to illuminate the dye when inspecting for leaks.
Always wear fluorescence enhancing UV safety glasses to protect your eyes and enhance the visibility of
the fluorescent dye.
A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal
should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).
Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a
future service.
Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled,
clean immediately with the approved dye cleaner. Fluorescent dye 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 R-134a and R-12 A/C systems are different. Do not use R-134a leak detection
dye in R-12 A/C systems or R-12 leak detection dye in R-134a A/C systems or A/C system damage may
result.
The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure
occurs.

A/C Identification Label

EJS000Z7

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

Revision: May 2004

MTC-4

2002 Altima

PRECAUTIONS
Precautions for Refrigerant Connection

EJS000Z8

A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.
●
Expansion valve to cooling unit
●
Evaporator pipes to evaporator (inside cooling unit)
●
Refrigerant pressure sensor

FEATURES OF NEW TYPE REFRIGERANT CONNECTION
●

●

The O-ring has been relocated. It has also been provided with a groove for proper installation. This eliminates 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 relation to the contacting surface of the mating part to improve sealing
characteristics.
The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facilitating piping connections.

MTC
SHA815E

Revision: May 2004

MTC-5

2002 Altima

PRECAUTIONS
O-RING AND REFRIGERANT CONNECTION
QR25DE Models

WJIA0131E

Revision: May 2004

MTC-6

2002 Altima

PRECAUTIONS
VQ35DE Models
A

MTC

WJIA0135E

CAUTION:
The new and former refrigerant connections use different O-ring configurations. Do not confuse Orings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or
around, the connection.

Revision: May 2004

MTC-7

2002 Altima

PRECAUTIONS
O-Ring Part Numbers and Specifications
Connection type

O-ring
size

Part number*

New

92471 N8210

6.8 (0.268)

1.85 (0.0728)

Former

J2476 89956

9.25 (0.3642)

1.78 (0.0701)

92472 N8210

10.9 (0.429)

2.43 (0.0957)

92475 71L00

11.0 (0.433)

2.4 (0.094)

92473 N8210

13.6 (0.535)

2.43 (0.0957)

92475 72L00

14.3 (0.563)

2.3 (0.091)

92474 N8210

16.5 (0.650)

2.43 (0.0957)

New

Former
New

Former
SHA814E

New

mm (in)

*: Always check with the Parts Department for the latest parts information.

WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
●
When the compressor is removed, store it in the same position as it is when mounted on the car.
Failure to do so will cause lubricant to enter the low pressure chamber.
●
When connecting tubes, always use a torque wrench and a back-up wrench.
●
After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
●
When installing an air conditioner in the vehicle, connect the pipes as the final stage of the operation. Do not remove the seal caps of pipes and other components until just before required for
connection.
●
Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.
●
Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
●
Always replace used O-rings.
●
When connecting tube, apply 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 Oil Type DH-PS
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.

Revision: May 2004

MTC-8

2002 Altima

PRECAUTIONS
●

After connecting line, conduct leak test and make sure that there is no leakage from connections.
When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten connections of seal seat to the specified torque.

G
RHA861F

Precautions for Servicing Compressor
●
●
●

●

EJS000Z9

H
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 Lubricant Quantity in CompresI
sor” exactly. Refer to MTC-18, "Maintenance of Lubricant Quantity in Compressor" .
Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with lubricant, wipe it off by using a clean waste cloth moistened with thinner.
MTC
After compressor service operation, turn the compressor shaft by hand more than 5 turns in both
directions. This will equally distribute lubricant 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 K
operation. [Gap between clutch disc and pulley is 0.3 - 0.6 mm (0.012 - 0.024 in)]

Precautions for Service Equipment

EJS000ZA

RECOVERY/RECYCLING EQUIPMENT
Follow the manufacturer's instructions for machine operation and machine maintenance. Never introduce any
refrigerant other than that specified into the machine.

ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operation and tester maintenance.

Revision: May 2004

MTC-9

2002 Altima

PRECAUTIONS
VACUUM PUMP
The lubricant contained inside the vacuum pump is not compatible
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 vacuum pump lubricant may migrate out of the pump into
the service hose. This is possible when the pump is switched off
after evacuation (vacuuming) and hose is connected to it.
To prevent this migration, use a manual valve situated near the
hose-to-pump connection, as follows.
●
Usually vacuum pumps have a manual isolator valve as part of
the pump. Close this valve to isolate the service hose from the
pump.
●
For pumps without an isolator, use a hose equipped with a manual shut-off valve near the pump end. Close the valve to isolate
the hose from the pump.
●
If the hose has an automatic shut off valve, disconnect the hose
from the pump: as long as the hose is connected, the valve is
open and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close
under a no vacuum condition. Such valves may restrict the pump's
ability to pull a deep vacuum and are not recommended.
RHA270D

MANIFOLD GAUGE SET
Be certain that the gauge face indicates R-134a or 134a. Make sure
the gauge set has 1/2″-16 ACME threaded connections for service
hoses. Confirm the set has been used only with refrigerant HFC134a (R-134a) along with specified lubricant.

SHA533D

SERVICE HOSES
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shutoff devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.

RHA272D

Revision: May 2004

MTC-10

2002 Altima

PRECAUTIONS
SERVICE COUPLERS
A

Never attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. However, if an
improper connection is attempted, discharging and contamination
may occur.
Shut-off valve rotation

A/C service valve

Clockwise

Open

Counterclockwise

RHA273D

REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFC-134a (R-134a) and specified lubricants have been used with the scale. If the scale controls
refrigerant flow electronically, the hose fitting must be 1/2″-16
ACME.

RHA274D

CALIBRATING ACR4 WEIGHT SCALE
Calibrate the scale every three months.
I
To calibrate the weight scale on the ACR4 (J-39500-NI):
1. Press Shift/Reset and Enter at the same time.
2. Press 8787 . “A1 ” will be displayed.
MTC
3. Remove all weight from the scale.
4. Press 0 , then press Enter . “0.00 ” will be displayed and change to “A2 ”.
5. Place a known weight (dumbbell or similar weight), between 4.5 and 36.3 kg (10 and 80 lb) on the center
K
of the weight scale.
6. Enter the known weight using four digits. (Example 10 lbs = 10.00, 10.5 lbs = 10.50)
7. Press Enter — the display returns to the vacuum mode.
L
8. Press Shift/Reset and Enter at the same time.
9. Press 6 — the known weight on the scale is displayed.
10. Remove the known weight from the scale. “0.00 ” will be displayed.
M
11. Press Shift/Reset to return the ACR4 to the program mode.

CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder's top valve
when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an
electronic scale or of quality recycle/recharge equipment.

Wiring Diagrams and Trouble Diagnosis

EJS000ZB

When you read wiring diagrams, refer to the following:
●
GI-12, "How to Read Wiring Diagrams"
●
PG-5, "Wiring Diagram — POWER —"
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"

Revision: May 2004

MTC-11

2002 Altima

PREPARATION
PREPARATION
Special Service Tools

PFP:00002
EJS000ZC

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name

Description

KV99234330
(J-38873)
Pulley installer

Installing pulley

LHA171

KV99233130
(J-29884)
Pulley puller

Removing pulley

LHA172

HFC-134a (R-134a) Service Tools and Equipment

EJS000ZD

Never mix HFC-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 container fittings, service hose fittings and service equipment fittings (equipment which handles
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 convert one size fitting to another must never be used: refrigerant/lubricant contamination will
occur and compressor failure will result.
Tool number
(Kent-Moore No.)
Tool name

Description

HFC-134a (R-134a) refrigerant

Container color:Light blue
Container marking:HFC-134a (R134a)
Fitting size: Thread size
●

large container 1/22 -16 ACME

S-NT196

KLH00-PAGS0
(-)
Nissan A/C System Oil Type DHPS

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)
S-NT197

Revision: May 2004

MTC-12

2002 Altima

PREPARATION
Tool number
(Kent-Moore No.)
Tool name
(J-39500-NI)
Recovery/Recycling
Recharging equipment (ACR4)

Description

Function:Refrigerant Recovery and
Recycling and Recharging

D
RJIA0195E

(J-41995)
Electronic refrigerant leak detector

Power supply:
●

DC 12V (Cigarette lighter)

H
AHA281A

(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

Power supply:
DC 12V (Battery terminal)

MTC

K
SHA437F

(J-42220)
Fluorescent dye leak detector

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
SHA438F

(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)

Application: For HFC-134a (R-134a)
PAG oil
Container: 1/4 ounce (7.4cc) bottle
(Includes self-adhesive dye identification labels for affixing to vehicle after
charging system with dye.)

SHA439F

Revision: May 2004

MTC-13

2002 Altima

PREPARATION
Tool number
(Kent-Moore No.)
Tool name

Description

(J-41459)
HFC-134a (R-134a) Dye injector
Use with J-41447, 1/4 ounce bottle

For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.

SHA440F

(J-43872)
Dye cleaner

For cleaning dye spills.

SHA441F

Identification:

(J-39183-C)
Manifold gauge set (with hoses
and couplers)

●

The gauge face indicates R-134a.
Fitting size: Thread size
1/22 -16 ACME

RJIA0196E

Service hoses
●

Hose color:

High side hose
(J-39500-72B)

●

Low side hose
(J-39500-72R)

●

Utility hose
(J-39500-72Y)

S-NT201

Service couplers
●

High side coupler
(J-39500-20A)

●

Low side coupler
(J-39500-24A)

●

Low side hose:Blue with black stripe

●

High side hose:Red with black stripe

●

Utility hose:Yellow with black stripe
or green with black stripe
Hose fitting to gauge:

●

1/22 -16 ACME

Hose fitting to service hose:
●

M14 x 1.5 fitting is optional or permanently attached.

S-NT202

(J-39699)
Refrigerant weight scale

For measuring of refrigerant
Fitting size: Thread size
●

1/22 -16 ACME

S-NT200

Capacity:

(J-39649)
Vacuum pump
(Including the isolator valve)

●

Air displacement: 4 CFM

●

Micron rating: 20 microns

●

Oil capacity: 482 g (17 oz)
Fitting size: Thread size

●

1/22 -16 ACME

S-NT203

Revision: May 2004

MTC-14

2002 Altima

PREPARATION
Commercial Service Tools

EJS000ZE

A
Tool name

Description

(J-41810-NI)
Refrigerant identifier equipment(R-134a)

Checks refrigerant purity and for system contamination

D
RJIA0197E

Power tool

Loosening bolts and nuts

PBIC0190E

(J-44614)
Clutch disc holding tool

G
Clutch disc holding tool

WHA230

MTC

Revision: May 2004

MTC-15

2002 Altima

REFRIGERATION SYSTEM
REFRIGERATION SYSTEM
Refrigeration Cycle

PFP:KA990
EJS000ZF

REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser, the liquid tank,
through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is
controlled by an externally equalized expansion valve, located inside the evaporator case.

REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sensor, located on the condenser. If the system pressure rises above or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high pressure side
detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm2 , 398 psi) or below about 120 kPa
(1.22 kg/cm2 , 17.4 psi).

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/
cm2 , 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.

LJIA0015E

Revision: May 2004

MTC-16

2002 Altima

REFRIGERATION SYSTEM
Component Layout

EJS000ZG

MTC

WJIA0287E

Revision: May 2004

MTC-17

2002 Altima

LUBRICANT
LUBRICANT
Maintenance of Lubricant Quantity in Compressor

PFP:KLG00
EJS000ZH

The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compressor when replacing any component or after a large refrigerant leakage has occurred. It is important to maintain
the specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:
●
Lack of lubricant: May lead to a seized compressor
●
Excessive lubricant: Inadequate cooling (thermal exchange interference)

LUBRICANT
Name: Nissan A/C System Oil Type DH-PS
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 operation be performed?
●
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 operation for about 10 minutes.
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 case 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 Compressor" .
No
>> Carry out the A/C performance test.
Revision: May 2004

MTC-18

2002 Altima

LUBRICANT
Lubricant Adjusting Procedure for Component Replacement Except Compressor
After replacing any of the following major components, add the correct amount of lubricant to the system.
Amount of lubricant to be added
Lubricant to be added to
system
Part replaced

Amount of lubricant
m (US fl oz, Imp fl oz)

B
Remarks

Evaporator

75 (2.5, 2.6)

—

Condenser

75 (2.5, 2.6)

—

Liquid tank

5 (0.2, 0.2)

Add if compressor is not
replaced.

30 (1.0, 1.1)

Large leak

—

Small leak *1

In case of refrigerant leak
●

*1:

If refrigerant leak is small, no addition of lubricant is needed.

Lubricant Adjustment Procedure for Compressor Replacement
1.
2.
3.
4.
5.
6.
7.
8.
9.

F
Before connecting ACR4 to vehicle, check ACR4 gauges. No refrigerant pressure should be displayed. If
OK, recover refrigerant from equipment lines.
Confirm refrigerant purity in supply tank using ACR4 and refrigerant identifier. If NG, refer to MTC-3, "Con- G
taminated Refrigerant" .
Connect ACR4 to vehicle. Confirm refrigerant purity in vehicle A/C system using ACR4 and refrigerant
identifier. If NG, refer to MTC-3, "Contaminated Refrigerant" .
H
Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure lubricant discharged into
the recovery/recycling equipment.
Drain the lubricant from the “old” (removed) compressor into a graduated container and recover the
I
amount of lubricant drained.
Drain the lubricant from the “new” compressor into a separate, clean container.
Measure an amount of new lubricant installed equal to amount drained from “old” compressor. Add this MTC
lubricant to “new” compressor through the suction port opening.
Measure an amount of new lubricant equal to the amount recovered during discharging. Add this lubricant
to “new” compressor through the suction port opening.
K
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.
L

Revision: May 2004

MTC-19

2002 Altima

LUBRICANT

RHA065DD

Revision: May 2004

MTC-20

2002 Altima

AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL
Control Operation

PFP:27500

A
EJS000ZI

WJIA0133E

FAN CONTROL DIAL
This dial turns 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 compressor turns on when the dial is moved to "MAX A/C" or

TEMPERATURE CONTROL DIAL

MTC

This dial allows adjustment 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 light.
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 conditioner switch controls the A/C system. When the switch is depressed with the fan ON, the compressor will turn ON. The indicator lamp will also light.
The air conditioner cooling function operates only when the engine is running.

Revision: May 2004

MTC-21

2002 Altima

AIR CONDITIONER CONTROL
Discharge Air Flow

EJS000ZJ

WJIA0016E

Revision: May 2004

MTC-22

2002 Altima

AIR CONDITIONER CONTROL
System Description

EJS000ZK

SWITCHES AND THEIR CONTROL FUNCTION

I
WJIA0134E

CAN Communication System Description

EJS000ZL

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 operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.

MTC

FOR TCS MODELS
System diagram

LKIA0015E

Input/output signal chart
T: Transmit R: Receive
Signals

ECM

TCM

COMBINATION
METER

Engine speed signal

Engine coolant temperature signal

Revision: May 2004

MTC-23

BCM

ABS/TCS
control unit

IPDM E/R

2002 Altima

AIR CONDITIONER CONTROL

Signals

ECM

Accelerator pedal position signal

Fuel consumption monitor signal

A/T warning lamp signal

TCM

COMBINATION
METER

BCM

ABS/TCS
control unit

R(R range only)

IPDM E/R

R
T

A/T position indicator signal

ABS operation signal

TCS operation signal

Air conditioner switch signal

Air conditioner compressor signal

A/C compressor request signal

Cooling fan motor operation signal

Cooling fan speed request signal

T
R

T
T

Position lights request

Position lights status

Low beam request

Front fog lights request

Front fog light status

Low beam status

High beam request
High beam status

R
R

OD cancel switch signal

Brake switch signal

Vehicle speed signal

Oil pressure switch

Sleep request1

Sleep request2

R
T
T
T

N range switch signal

P range switch signal

Seat belt buckle switch signal

Door switch signal

Tail lamp request

Turn indicator signal

Buzzer output signal

Trunk switch signal

ASCD main switch signal

ASCD cruise signal

Wiper operation

Wiper stop position signal

Rear window defogger switch signal

Rear window defogger control signal

Revision: May 2004

MTC-24

2002 Altima

AIR CONDITIONER CONTROL
FOR A/T MODELS
System diagram

D
LKIA0017E

Input/output signal chart
T: Transmit R: Receive
Signals

ECM

TCM

COMBINATION
METER

Engine speed signal

Engine coolant temperature signal

Accelerator pedal position signal

Fuel consumption monitor signal

A/T warning lamp signal

BCM

IPDM E/R

R(R range only)

Air conditioner switch signal

Air conditioner compressor signal

A/C compressor request signal

R(QR25DE)

Cooling fan motor operation signal

Cooling fan speed request signal

MTC

Position lights status

Low beam request

High beam request
High beam status

R
R

Front fog lights request
Front fog light status

OD cancel switch signal

Brake switch signal

Vehicle speed signal

Oil pressure switch

Sleep request1

Sleep request2
R

P range switch signal

R
T
T

Seat belt buckle switch signal

Door switch signal

MTC-25

T
R

N range switch signal

Revision: May 2004

Position lights request

Low beam status

A/T position indicator signal

Blower fan switch signal

2002 Altima

AIR CONDITIONER CONTROL
Signals

ECM

COMBINATION
METER

TCM

BCM

IPDM E/R
R

Tail lamp request

Turn indicator signal

Buzzer output signal

Trunk switch signal

ASCD main switch signal

ASCD cruise signal

Wiper operation

Wiper stop position signal

Rear window defogger switch signal
Rear window defogger control signal

FOR M/T MODELS
System diagram

LKIA0018E

Input/output signal chart
T: Transmit R: Receive
Signals

ECM

COMBINATION
METER

BCM

IPDM E/R

Engine speed signal

Engine coolant temperature signal

Fuel consumption monitor signal

Air conditioner switch signal

Air conditioner compressor signal

A/C compressor request signal

Blower fan switch signal

R(QR25DE)

Cooling fan motor operation signal

Cooling fan speed request signal

Position lights request

Position lights status

Low beam request

Low beam status

High beam request

Front fog lights request

Front fog light status

High beam status

Vehicle speed signal

R
R

Oil pressure switch

Revision: May 2004

T
R

MTC-26

2002 Altima

AIR CONDITIONER CONTROL
Signals

ECM

Sleep request1

COMBINATION
METER
R

Sleep request2

BCM

IPDM E/R

T
T

Seat belt buckle switch signal

Door switch signal

Tail lamp request

Turn indicator signal

Buzzer output signal

Trunk switch signal

ASCD main switch signal

ASCD cruise signal

E
R

Wiper stop position signal

Rear window defogger switch signal

Wiper operation

Rear window defogger control signal

MTC

Revision: May 2004

MTC-27

2002 Altima

TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
How to Perform Trouble Diagnoses for Quick and Accurate Repair

PFP:00004
EJS000ZM

WORK FLOW

SHA900E

*1: MTC-38, "Operational Check"

SYMPTOM TABLE
Symptom
●

A/C system does not come on.

●

Air outlet does not change.

●

Reference Page
●

Go to Trouble Diagnosis Procedure for A/C system.

MTC-40

Mode door motor does not operate normally.

●

Go to Trouble Diagnosis Procedure for Mode Door Motor.

MTC-42

●

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 normally.

●

Go to Trouble Diagnosis Procedure for Intake Door Motor.

MTC-46

●

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 cooling.

●

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

Revision: May 2004

MTC-28

2002 Altima

TROUBLE DIAGNOSIS
Component Parts and Harness Connector Location

EJS000ZN

ENGINE COMPARTMENT
QR25DE Models

MTC

WJIA0136E

Revision: May 2004

MTC-29

2002 Altima

TROUBLE DIAGNOSIS
VQ35DE Models

WJIA0137E

Revision: May 2004

MTC-30

2002 Altima

TROUBLE DIAGNOSIS
PASSENGER COMPARTMENT
A

MTC

WJIA0138E

Revision: May 2004

MTC-31

2002 Altima

TROUBLE DIAGNOSIS
Circuit Diagram

EJS000ZO

WJWA0011E

Revision: May 2004

MTC-32

2002 Altima

TROUBLE DIAGNOSIS
Wiring Diagram — HEATER —

EJS000ZP

MTC

WJWA0012E

Revision: May 2004

MTC-33

2002 Altima

TROUBLE DIAGNOSIS

WJWA0013E

Revision: May 2004

MTC-34

2002 Altima

TROUBLE DIAGNOSIS
Wiring Diagram — A/C,M —

EJS000ZQ

MTC

WJWA0014E

Revision: May 2004

MTC-35

2002 Altima

TROUBLE DIAGNOSIS

WJWA0015E

Revision: May 2004

MTC-36

2002 Altima

TROUBLE DIAGNOSIS

MTC

WJWA0016E

Revision: May 2004

MTC-37

2002 Altima

TROUBLE DIAGNOSIS
Operational Check

EJS000ZR

The purpose of the operational check is to confirm that the system operates as it should. The systems which
are checked are the blower, mode (discharge air), intake air, temperature decrease, temperature increase.

CONDITIONS:
Engine running at normal operating temperature.

PROCEDURE:
1. Check Blower
1.

Turn fan control dial to 1-speed.
Blower should operate on 1-speed.
2. Then turn fan control dial to 2-speed.
3. Continue checking blower speed until all four speeds are
checked.
4. Leave blower on 4-speed.
If NG, go to MTC-49, "Blower Motor Circuit" .
If OK, continue with next check.
WJIA0139E

2. Check Discharge Air
1. Turn air control dial to each position.
2. Confirm air discharge at all air outlets.
If NG, go to MTC-42, "Mode Door Motor Circuit" .
If OK, continue with next check.

WJIA0140E

3. Check Recirculation
1.

Press recirculation switch.
Recirculation indicator should light.
2. Listen for intake door position change (you should hear blower
sound change slightly).
NOTE:
Confirm that the RECIRCULATION (REC) switch is canceled in
the FOOT (
), D/F ( ) and DEF ( ) modes.
If NG, go to MTC-46, "Intake Door Motor Circuit" .
If OK, continue with next check.
WJIA0141E

4. Check Temperature Decrease
1. Turn fan control dial to 1-speed.
2. Turn temperature control dial to full cold.
3. Check for cold air at discharge air outlets.
If NG, go to MTC-58, "Insufficient Cooling" .
If OK, continue with next check.

WJIA0142E

Revision: May 2004

MTC-38

2002 Altima

TROUBLE DIAGNOSIS
5. Check Temperature Increase
A

1. Turn temperature control dial to full hot.
2. Check for hot air at discharge air outlets.
If NG, go to MTC-63, "Insufficient Heating" .
If OK, continue with next check.

WJIA0143E

6. Check Air Conditioner Switch
Turn fan control dial to the desired (1- to 4-speed) position and push
the air conditioner switch (if equipped) to turn ON the air conditioner.
The indicator light should come on when air conditioner is ON.
If NG, go to MTC-40, "A/C System" .
If all operational checks are OK (symptom can not be duplicated), go
to “Incident Simulation Tests” (GI-25 ) and perform tests as outlined
to simulate driving conditions environment. If symptom appears,
refer to MTC-28, "SYMPTOM TABLE" and perform applicable trouble diagnosis procedures.

WJIA0144E

MTC

Revision: May 2004

MTC-39

2002 Altima

TROUBLE DIAGNOSIS
A/C System

EJS000ZS

SYMPTOM:
●
A/C system does not come on.

INSPECTION FLOW

WJIA0145E

*1: MTC-39, "6. Check Air Conditioner
Switch"

*2: MTC-38, "Operational Check"

MTC-40, "DIAGNOSTIC PROCE*3: DURE"

DIAGNOSTIC PROCEDURE
SYMPTOM:
●
A/C system does not come on.

1. CHECK POWER SUPPLY CIRCUIT FOR A/C CONTROL UNIT
Voltage (V)
(Approx.)

Terminal
(+)

(-)

Connector

Wire color

M51-2

Body ground

12V

OK or NG
OK
>> GO TO 2.
NG
>> Check 10A fuse (No. 12) at fuse block (J/B).

Revision: May 2004

MTC-40

WJIA0147E

2002 Altima

TROUBLE DIAGNOSIS

2. CHECK BODY GROUND CIRCUIT FOR A/C CONTROL UNIT
Terminal
Connector

Wire color

M51-3

Continuity
Body ground

Yes

If OK, check harness for short.
OK or NG
OK
>> INSPECTION END
NG
>> If NG, repair harness or connector.

D
WJIA0146E

MTC

Revision: May 2004

MTC-41

2002 Altima

TROUBLE DIAGNOSIS
Mode Door Motor Circuit

EJS000ZT

SYMPTOM:
●
Air outlet does not change.
●
Mode door motor does not operate normally.

INSPECTION FLOW

WJIA0205E

MTC-44, "MODE DOOR"

MTC-28, "SYMPTOM TABLE"

MTC-38, "Operational Check"

MTC-22, "Discharge Air Flow"

Revision: May 2004

MTC-42

MTC-43, "DIAGNOSTIC PROCEDURE"

2002 Altima

TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Mode Door Motor

The mode door motor is installed on the heater unit. Using a link it
operates the mode door. When the air control dial is turned to each
position, the mode door motor moves the mode door to control air
flow direction.

D
WJIA0206E

H
WJIA0200E

DIAGNOSTIC PROCEDURE

SYMPTOM: Mode door motor does not operate normally.

MTC

L
WJIA0207E

1. CHECK BODY GROUND CIRCUIT FOR MODE DOOR MOTOR
Terminals
Connector

Wire color

M40-2

Continuity
Body ground

Yes

Continuity should exist.
If OK, check harness for short.
OK or NG
OK
>> GO TO 2.
NG
>> Repair harness or connector.

Revision: May 2004

WJIA0208E

MTC-43

2002 Altima

TROUBLE DIAGNOSIS

2. CHECK CIRCUIT CONTINUITY BETWEEN EACH TERMINAL ON A/C CONTROL UNIT AND ON
MODE DOOR MOTOR

Terminals

Continuity

Connectors

Wire colors

Connectors

Wire colors

M51-9

L/B

M40-3

L/B

M51-12

L/R

M40-1

L/R

Yes

Continuity should exist.
If OK, check harness for short.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.

WJIA0209E

3. CHECK FOR A/C CONTROL UNIT OUTPUT
1.
2.

Reconnect mode door motor connector.
Measure voltage across A/C control unit harness connector M51
terminals 9 (L/B) and 12 (L/R) while turning air control dial to
each position.
Voltage (V)

: Approx. 12V

OK or NG
OK
>> Replace mode door motor.
NG
>> Replace A/C control unit.

WJIA0210E

MODE DOOR
1.
2.
3.
4.

Install mode door motor on heater unit.
Ensure that the linkage is properly attached.
Connect mode door motor harness connector.
Turn ignition switch ON.
Check that the mode door operates properly when air control
dial is turned to each position.

WJIA0200E

Revision: May 2004

MTC-44

2002 Altima

TROUBLE DIAGNOSIS
Air Mix Door

EJS001LH

SYMPTOM: Air mix door does not change.

INSPECTION FLOW
B

WJIA0288E

MTC-38

MTC-28

MTC

MTC-45

CONTROL LINKAGE ADJUSTMENT
Temperature control cable

1.
2.
3.

Attach temperature control cable.
Rotate control knob to full cold position.
Remove slack from cable and install temperature control cable
clamp.
After positioning control cable, check for proper operation.

WJIA0192E

Revision: May 2004

MTC-45

2002 Altima

TROUBLE DIAGNOSIS
Intake Door Motor Circuit

EJS000ZU

Symptom:
●
Intake door does not change.
●
Intake door motor does not operate normally.

INSPECTION FLOW

WJIA0148E

*1: MTC-46, "Intake Door Motor Circuit"

Revision: May 2004

*2: MTC-38, "Operational Check"

MTC-46

*3: MTC-28, "SYMPTOM TABLE"

2002 Altima

TROUBLE DIAGNOSIS
SYSTEM DESCRIPTON
Intake Door Motor

The intake door motor is installed on the blower unit. Using a link it
opens and closes the intake door.
When RECIRCULATION switch is at REC (except DEF and D/F
modes), the A/C control unit sets the intake door at the “RECIRCULATION” position.

D
WJIA0149E

WJIA0150E

DIAGNOSTIC PROCEDURE
SYMPTOM: Intake door does not change. Intake door motor
does not operate normally.

MTC

WJIA0151E

1. CHECK BODY GROUND CIRCUIT FOR INTAKE DOOR MOTOR
Terminals
Connector

Wire color

M58-2

Continuity
Body ground

Yes

Continuity should exist.
If OK, check harness for short.
OK or NG
OK
>> GO TO 2.
NG
>> Repair harness or connector.

Revision: May 2004

WJIA0152E

MTC-47

2002 Altima

TROUBLE DIAGNOSIS

2. CHECK CIRCUIT CONTINUITY BETWEEN EACH TERMINAL ON A/C CONTROL UNIT AND ON
INTAKE DOOR MOTOR

Terminals

Continuity

Connectors

Wire colors

Connectors

Wire colors

M51-9

L/B

M58-3

L/B

M51-12

L/R

M58-1

L/R

Yes

Continuity should exist.
If OK, check harness for short.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.

WJIA0154E

3. CHECK FOR A/C CONTROL UNIT OUTPUT
Measure voltage across A/C control unit harness terminals and body ground.
Terminals
RECIRCULATION

(+)

(-)

Connectors

Wire colors

M51-9

L/B

Voltage (V)
(Approx.)
12V

REC(ON)

FRE(OFF)

Condition

REC
M51-12

L/R

M51-9

L/B

M51-12

L/R

Body
ground
FRE

0V
12V

OK or NG
OK
>> Replace intake door motor.
NG
>> Replace A/C control unit.

CONTROL LINKAGE ADJUSTMENT
1.

2.
3.
4.

Install intake door motor on blower unit.
Ensure that the intake door motor lever is fitted into the slit portion of intake door link.
Connect the intake door motor harness connector.
Turn ignition switch to ON.
Check that intake door operates properly when RECIRCULATION switch is turned ON and OFF.

WJIA0150E

Revision: May 2004

MTC-48

2002 Altima

TROUBLE DIAGNOSIS
Blower Motor Circuit

EJS000ZV

Symptom:
●
Blower motor operation is malfunctioning.

INSPECTION FLOW

MTC

K
WJIA0156E

*1: MTC-49, "Blower Motor Circuit"

*2: MTC-38, "Operational Check"

*3: MTC-28, "SYMPTOM TABLE"

DIAGNOSTIC PROCEDURE
SYMPTOM:
●
Blower motor operation is malfunctioning.
Test group No.

INCIDENT

Fan fails to rotate.

Fan does not rotate at 1-speed.

Fan does not rotate at 2-speed.

Fan does not rotate at 3-speed.

Fan does not rotate at 4-speed.

Revision: May 2004

MTC-49

2002 Altima

TROUBLE DIAGNOSIS

1. DIAGNOSTIC PROCEDURE
Check if blower motor rotates properly at each fan speed.
Conduct checks as per table above.
1
>> GO TO 2.
2, 3, 4 >> GO TO 8.
5
>> GO TO 10.

2. CHECK POWER SUPPLY FOR BLOWER MOTOR
Disconnect blower motor harness connector.
Voltage (V)
(Approx.)

Terminals
(+)

(-)

Connector

Wire color

M62-1

W/L

12V

Body ground

Yes or No
Yes
>> GO TO 3.
No
>> ● Check 15A fuses (No. 10 and No. 11) at fuse block (J/
WJIA0159E
B).
● Check blower relay [located in fuse block (J/B)]. Refer to PG-5, "Wiring Diagram — POWER —
".

3. CHECK CIRCUIT CONTINUITY FOR BLOWER MOTOR
Turn fan control switch to any position except OFF.
Terminals
(+)

(-)

Connector

Wire color

M62-2

L/W

Voltage (V)
(Approx.)
12V

Body ground

Continuity should exist.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 5.

WJIA0160E

4. CHECK BLOWER MOTOR
(Refer to Electrical Components Inspection.)
(MTC-53, "Blower motor" )
OK or NG
OK
>> INSPECTION END
NG
>> Replace blower motor.

Revision: May 2004

MTC-50

2002 Altima

TROUBLE DIAGNOSIS

5. CHECK BLOWER MOTOR CIRCUIT BETWEEN BLOWER MOTOR AND RESISTOR

Reconnect blower motor harness connector.
B

Terminals
(+)

Voltage (V)
(Approx.)

(-)

Connector

Wire color

M63-1

L/W

12V

Body ground

Yes or No
Yes
>> GO TO 7.
No
>> GO TO 6.

D
WJIA0161E

6. CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND RESISTOR

Disconnect blower motor and resistor harness connectors.
Terminals

Continuity

Connector

Wire color

Connector

Wire color

M63-1

L/W

M62-2

L/W

Yes

Continuity should exist.
H

If OK, check harness for short.
OK or NG
OK
>> INSPECTION END
NG
>> Repair harness or connector.

WJIA0162E

7. CHECK GROUND CIRCUIT FOR FAN SWITCH
●
●

MTC

Disconnect fan switch harness connector.
Check circuit continuity between fan switch harness terminal
and body ground.
Terminals
(+)

(-)

Connector

Wire color

M41-5

Voltage (V)
(Approx.)

12V
Body ground

OK or NG
OK
>> GO TO 8.
NG
>> Repair harness or connector.

WJIA0163E

8. CHECK BLOWER MOTOR RESISTOR
Refer to MTC-53, "Blower Motor Resistor" .
OK or NG
OK
>> GO TO 9.
NG
>> Replace blower motor resistor.

Revision: May 2004

MTC-51

2002 Altima

TROUBLE DIAGNOSIS

9. CHECK RESISTOR HARNESS CONNECTOR
Reconnect resistor harness connector.
OK or NG
1
>> GO TO 12.
2, 3, 4 >> GO TO 10.

10. CHECK FAN SWITCH CIRCUIT
Do approx. 12 volts exist between each fan switch harness connector terminal and body ground?
Terminal
Test group No.

(-)

Voltage (V)
(Approx.)

Body ground

12V

(+)
Connector

Wire color

M41-4

L/B

M41-3

L/R

M41-2

L/Y

M41-1

L/W

WJIA0164E

Yes or No
Yes
>> GO TO 12.
No
>> GO TO 11.

11. CHECK CIRCUIT CONTINUITY BETWEEN FAN SWITCH HARNESS TERMINAL AND RESISTOR
HARNESS TERMINAL

Terminal No.
Fan switch

Resistor

Continuity

Connectors

Wire colors

Connectors

Wire colors

M41-4

L/B

M63-4

L/B

M41-3

L/R

M63-3

L/R

M41-2

L/Y

M63-2

L/Y

M41-1

L/W

M63-1

L/W

Yes

WJIA0165E

OK or NG
OK
>> Check harness for short.
NG
>> Repair harness or connector.

12. CHECK FAN SWITCH
Refer to MTC-53, "Fan Switch" .
OK or NG
OK
>> INSPECTION END
NG
>> Replace fan switch.

Revision: May 2004

MTC-52

2002 Altima

TROUBLE DIAGNOSIS
ELECTRICAL COMPONENTS INSPECTION
Fan Switch

Check continuity between terminals at each switch position.
SWITCH POSITION

Continuity between terminals

OFF
1

4—5—6

3—5—6

2—5—6

1—5—6

D
WJIA0157E

Blower motor

Confirm smooth rotation of the blower motor.
●
Ensure that there are no foreign particles inside the intake unit.
F

Blower Motor Resistor
Check resistance between terminals.
Terminal No.
(+)

(−)

Resistance (Ω)
(Approx.)

2.27 - 2.78Ω

3
4
2

0.9 - 1.1Ω

0.3 - 0.38Ω

I
WJIA0158E

MTC

Revision: May 2004

MTC-53

2002 Altima

TROUBLE DIAGNOSIS
Magnet Clutch Circuit

EJS000ZW

Symptom:
●
Magnet clutch does not engage when A/C switch and fan switch are ON.

INSPECTION FLOW

WJIA0166E

*1: MTC-91, "Checking for Refrigerant
Leaks"

*2: MTC-55, "DIAGNOSTIC PROCEDURE"

*4: MTC-28, "SYMPTOM TABLE"

*5: MA-14, "Checking Drive Belts"

Revision: May 2004

MTC-54

*3: MTC-38, "Operational Check"

2002 Altima

TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE
A

SYMPTOM:
●
Magnet clutch does not engage when A/C switch and fan switch are ON.

1. CHECK POWER SUPPLY FOR COMPRESSOR

Disconnect compressor harness connector.
Terminals
(+)

(-)

Connector

Wire color

F3-1

Y/B

Voltage (V)
(Approx.)

12V

Body ground

OK or NG
OK
>> GO TO 2.
NG
>> GO TO 3.

E
WJIA0167E

2. CHECK MAGNET CLUTCH COIL

Check magnet clutch coil.
OK or NG
OK
>> Check compressor mounting points for looseness or corrosion and repair as necessary.
NG
>> Replace magnet clutch. Refer to MTC-85, "Removal and Installation for Compressor Clutch" .

3. CHECK MAGNET CLUTCH COIL POWER SUPPLY FROM IPDM E/R
Reconnect compressor harness connector.

I
Terminals
(-)

Voltage (V)
(Approx.)

Body ground

12V

(+)
Connector

Wire color

E124-28

Y/B

OK or NG
OK
>> Repair harness or connector between IPDM E/R and
compressor.
NG
>> GO TO 4.

MTC

WJIA0065E

4. CHECK INTAKE SENSOR CIRCUIT
Refer to MTC-65, "Intake Sensor Circuit" .
OK or NG
OK
>> GO TO 5.
NG
>> Repair as necessary.

5. CHECK REFRIGERANT PRESSURE SENSOR
Refer to EC-595, "REFRIGERANT PRESSURE SENSOR" (QR25DE models) or EC-1266, "REFRIGERANT
PRESSURE SENSOR" (VQ35DE models).
OK or NG
OK
>> GO TO 6.
NG
>> Repair as necessary.

Revision: May 2004

MTC-55

2002 Altima

TROUBLE DIAGNOSIS

6. CHECK FAN ON SIGNAL TO A/C CONTROL UNIT AND BCM
1.
2.
3.
4.

Disconnect A/C control unit harness connector M51.
Measure voltage between A/C control unit and body ground.
Reconnect A/C control unit harness connector M51 and disconnect BCM harness connector M18.
Measure voltage between BCM and body ground.
Terminals
Condition

Voltage (V)
(Approx.)

FAN SW: OFF

FAN SW: ON

G/B

FAN SW: OFF

G/B

FAN SW: ON

(+)
Connectors

(-)

Wire colors
G/B

M51-5

G/B
M18-65

Body ground

WJIA0211E

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.

7. CHECK FAN SWITCH
Check fan switch. Refer to MTC-53, "Fan Switch" .
OK or NG
OK
>> Repair harness or connectors between fan switch and A/C control unit and BCM.
NG
>> Replace fan switch.

8. CHECK COMPRESSOR ON SIGNAL
1.
2.

Reconnect A/C control unit harness connector.
With fan switch ON, measure voltage between A/C control unit
and body ground with A/C switch OFF and ON.
Terminals
(+)
Connector

Voltage (V)
(Approx.)

A/C SW: OFF

A/C SW: ON

Wire color
L/W

M51-1

Condition

(-)

Body ground

L/W

OK or NG
OK
>> GO TO 9.
NG
>> Replace A/C control unit.

WJIA0213E

9. CHECK COMPRESSOR ON SIGNAL CIRCUIT
1.
2.

Disconnect A/C control unit harness connector.
Check continuity between A/C control unit and BCM.
Terminals

Continuity

Connector

Wire color

Connector

Wire color

M18-58

L/W

M51-1

L/W

Yes

If OK, check harness for short.
OK or NG
OK
>> GO TO 10.
NG
>> Repair harness or connectors.
WJIA0170E

Revision: May 2004

MTC-56

2002 Altima

TROUBLE DIAGNOSIS

10. CHECK CAN COMMUNICATION CIRCUITS

Check CAN communication circuits between BCM to ECM and between ECM to IPDM E/R. Refer to LAN-3,
"CAN COMMUNICATION" .
OK or NG
OK
>> ECM is malfunctioning.
NG
>> Repair or replace component based on diagnosis.

REFRIGERANT PRESSURE SENSOR

Make sure that higher A/C refrigerant pressure results in higher
refrigerant pressure sensor output voltage.

OFF
kPa (kg/cm2 , psi)
Low-pressure side

Decreasing to 0.18 (0.00184, 0.03)

High-pressure side

Increasing to 2.74 (0.0279, 0.40)

Refer to EC-595, "REFRIGERANT PRESSURE SENSOR"
(QR25DE models) or EC-1266, "REFRIGERANT PRESSURE SENSOR" (VQ35DE models).

F
BBIA0027E

SHA315F

MTC

Revision: May 2004

MTC-57

2002 Altima

TROUBLE DIAGNOSIS
Insufficient Cooling

EJS000ZX

Symptom:
●
Insufficient cooling.

INSPECTION FLOW

WJIA0175E

*1: MA-14, "Checking Drive Belts"
(QR25DE) or MA-21, "Checking
Drive Belts" (VQ35DE)

*2: MTC-46, "Intake Door Motor Circuit"

*3: EC Section

*4: MTC-3, "Contaminated Refrigerant"

*5: MTC-79, "HFC-134a (R-134a) Service Procedure"

*6: MTC-59, "Performance Chart"

*7: MTC-83, "Removal and Installation
*8: MTC-38, "Operational Check"
for Compressor — QR25DE Models"
or MTC-84, "Removal and Installation for Compressor — VQ35DE
Models"

Revision: May 2004

MTC-58

MTC-28, "SYMPTOM TABLE"

2002 Altima

TROUBLE DIAGNOSIS

PERFORMANCE CHART
Test Condition

Testing must be performed as follows:
Vehicle location

Indoors or in the shade (in a well-ventilated place)

Doors

Closed

Door window

Open

Hood

Open

TEMP.

Max. COLD

Mode switch

(Ventilation) set

Intake switch

(Recirculation) set
Max. speed set

(blower) speed
Engine speed

Idle speed

Operate the air conditioning system for 10 minutes before taking measurements.

Test Reading

Recirculating-to-discharge Air Temperature Table
Inside air (Recirculating air) at blower assembly inlet
Relative humidity
%

Discharge air temperature at center ventilator
°C (°F)

Air temperature
°C (°F)

50 - 60

60 - 70

25 (77)

10.0 - 12.3 (50 - 54)

30 (86)

13.2 - 15.3 (56 - 60)

35 (95)

17.2 - 21.0 (63 - 70)

25 (77)

12.3 - 14.9 (54 - 59)

30 (86)

15.3 - 19.3 (60 - 67)

35 (95)

21.0 - 24.4 (70 - 76)

MTC

Ambient Air Temperature-to-operating Pressure Table
Ambient air
Relative humidity
%

50 - 70

Air temperature
°C (°F)

High-pressure (Discharge side)
kPa (kg/cm2, psi)

Low-pressure (Suction side)
kPa (kg/cm2, psi)

30 (86)

1,220 - 1,500
(12.44 - 15.30, 176.9 - 217.5)

240 - 295
(2.45 - 3.01, 34.8 - 42.8)

35 (95)

1,360 - 1,690
(13.87 - 17.24, 197.2 - 245.1)

275 - 335
(2.81 - 3.42, 39.9 - 48.6)

40 (104)

1,500 - 1,830
(12.44 - 18.67, 176.9 - 265.4)

310 - 375
(3.16 - 3.83, 45.0 - 54.4)

TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE
Whenever system's high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (normal) pressure range. Since the standard (normal) pressure, differs from vehicle to vehicle, refer to Ambient Air Temperature-to-operating Pressure
Table above.

Revision: May 2004

MTC-59

2002 Altima

TROUBLE DIAGNOSIS
Both High and Low-pressure Sides are Too High
Gauge indication

Refrigerant cycle

Probable cause

Pressure is reduced soon after
water is splashed on condenser.

Excessive refrigerant charge in
refrigeration cycle

Air suction by cooling fan is
insufficient.

Insufficient condenser cooling
performance
↓
1. Condenser fins are clogged.

Corrective action
Reduce refrigerant until specified pressure is obtained.

●

Clean condenser.

●

Check and repair cooling fan
as necessary.

2. Improper fan rotation of cooling fan
●

Both high and low-pressure
sides are too high.

●

Low-pressure pipe is not
cold.
When compressor is stopped
high-pressure value quickly
drops by approximately 196
kPa (2 kg/cm2 , 28 psi). It
then decreases gradually
thereafter.

Engine tends to overheat.

Poor heat exchange in condenser
(After compressor operation
stops, high pressure decreases
too slowly.)
↓
Air in refrigeration cycle

Evacuate repeatedly and
recharge system.

Engine cooling systems malfunction.

Check and repair each engine
cooling system.

AC359A

●

An area of the low-pressure
pipe is colder than areas
near the evaporator outlet.

●

Plates are sometimes covered with frost.

●

Excessive liquid refrigerant
on low-pressure side

●

Excessive refrigerant discharge flow

●

Expansion valve is open a little compared with the specification.

Replace expansion valve.

↓
1. Improper thermal valve
installation
2. Improper expansion valve
adjustment

High-pressure Side is Too High and Low-pressure Side is Too Low
Gauge indication

Refrigerant cycle

Probable cause

Corrective action

High-pressure side is too high and
low-pressure side is too low.
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.

High-pressure tube or parts
located between compressor
and condenser are clogged or
crushed.

●

Check and repair or replace
malfunctioning parts.

●

Check lubricant for contamination.

AC360A

High-pressure Side is Too Low and Low-pressure Side is Too High
Gauge indication
High-pressure side is too low and
low-pressure side is too high.

AC356A

Revision: May 2004

Refrigerant cycle

Probable cause

Corrective action

High and low-pressure sides
become equal soon after compressor operation stops.

Compressor pressure operation is improper.
↓
Damaged inside compressor
packings

Replace compressor.

No temperature difference
between high and low-pressure sides

Compressor pressure operation is improper.
↓
Damaged inside compressor
packings.

Replace compressor.

MTC-60

2002 Altima

TROUBLE DIAGNOSIS
Both High- and Low-pressure Sides are Too Low
Gauge indication

Refrigerant cycle
●

There is a big temperature
difference between receiver
drier outlet and inlet. Outlet
temperature is extremely
low.

●

Liquid tank inlet and expansion valve are frosted.

●

Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.

●

Both high- and low-pressure sides
are too low.

Expansion valve inlet may
be frosted.

Liquid tank inside is slightly
clogged.

Corrective action

●

Replace desiccant assy.

●

Check lubricant for contamination.

There is a big temperature difference between expansion
valve inlet and outlet while the
valve itself is frosted.

D
High-pressure pipe located
between receiver drier and
expansion valve is clogged.

●

Check and repair malfunctioning parts.

●

Check lubricant for contamination.

Temperature difference
occurs somewhere in highpressure side

Expansion valve and liquid
tank are warm or only cool
when touched.

AC353A

Probable cause

Low refrigerant charge
↓
Leaking fittings or components

Check refrigerant for leaks.
Refer to MTC-91, "Checking
for Refrigerant Leaks" .

Expansion valve closes a little
compared with the specification.
↓

●

1. Improper expansion valve
adjustment

Remove foreign particles by
using compressed air.

●

Check lubricant for contamination.

2. Malfunctioning thermal
valve

3. Outlet and inlet may be
clogged.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.

Air flow volume is not enough
or is too low.

Low-pressure pipe is clogged
or crushed.

MTC

●

Check and repair malfunctioning parts.

●

Check lubricant for contamination.

●

Check intake sensor operation. Refer to MTC-68,
"INTAKE SENSOR" .

●

Replace compressor.

Evaporator is frozen.

Low-pressure Side Sometimes Becomes Negative
Gauge indication
Low-pressure side sometimes
becomes negative.

Refrigerant cycle
●

●

Air conditioning system
does not function and does
not cyclically cool the compartment air.
The system constantly functions for a certain period of
time after compressor is
stopped and restarted.

Probable cause
Refrigerant does not discharge cyclically.
↓
Moisture is frozen at expansion valve outlet and inlet.
↓
Water is mixed with refrigerant.

Corrective action

●

Drain water from refrigerant
or replace refrigerant.

●

Replace desiccant assy.

AC354A

Revision: May 2004

MTC-61

2002 Altima

TROUBLE DIAGNOSIS
Low-pressure Side Becomes Negative
Gauge indication

Refrigerant cycle

Probable cause

Corrective action
Leave the system at rest until
no frost is present. Start it
again to check whether or not
the problem is caused by
water or foreign particles.
●

If water is the cause, initially
cooling is okay. Then the
water freezes causing a
blockage. Drain water from
refrigerant or replace refrigerant.

●

If due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed air
(not shop air).

●

If either of the above methods cannot correct the problem, replace expansion
valve.

●

Replace desiccant assy.

●

Check lubricant for contamination.

Low-pressure side becomes negative.
Liquid tank or front/rear side of
expansion valve's pipe is
frosted or dewed.

High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid tank
is frosted.

AC362A

Revision: May 2004

MTC-62

2002 Altima

TROUBLE DIAGNOSIS
Insufficient Heating

EJS000ZY

SYMPTOM: Insufficient heating

INSPECTION FLOW
B

MTC

WJIA0176E

*3: MTC-46, "Intake Door Motor Circuit"

*1: MA-14, "Changing Engine Coolant"
(QR25DE) or MA-22, "Changing
Engine Coolant" (VQ35DE)

*2: CO-11, "CHECKING RADIATOR
CAP" (QR25DE) or CO-33,
"CHECKING RADIATOR CAP"
(VQ35DE)

*4: CO-20, "Removal and Installation"
(QR25DE) or EC-1110, "Overall
Function Check" (VQ35DE)

*5: MA-16, "FLUSHING COOLING SYS- *6: CO-11, "Refilling Engine Coolant"
TEM" (QR25DE) or MA-23, "FLUSH(QR25DE) or CO-33, "Refilling
ING COOLING SYSTEM"
Engine Coolant" (VQ35DE)
(VQ35DE)

*7: MTC-38, "Operational Check"

Revision: May 2004

MTC-28, "SYMPTOM TABLE"

MTC-63

2002 Altima

TROUBLE DIAGNOSIS
Noise

EJS000ZZ

SYMPTOM: Noise

INSPECTION FLOW

SHA331F

Revision: May 2004

MTC-64

2002 Altima

TROUBLE DIAGNOSIS
*1

MTC-85, "Removal and Installation
for Compressor Clutch"

MTC-18, "Maintenance of Lubricant
Quantity in Compressor"

MTC-86, "INSTALLATION"

MTC-38, "Operational Check"

MA-14, "Checking Drive Belts"
(QR25DE) or MA-21, "Checking
Drive Belts" (VQ35DE)

Intake Sensor Circuit

EJS00100

COMPONENT DESCRIPTION
Intake Sensor

The intake sensor is located on the heater and cooling unit. It converts temperature of air after it passes through the evaporator into a
resistance value which is then input to the A/C control unit.
After disconnecting intake sensor harness connector, measure resistance between terminals 1 and 2 at sensor harness side, using the
table below.
Temperature °C (°F)

Resistance kΩ

-15 (5)

12.34

-10 (14)

9.62

-5 (23)

7.56

0 (32)

6.00

5 (41)

4.80

10 (50)

3.87

15 (59)

3.15

20 (68)

2.57

25 (77)

2.12

30 (86)

1.76

35 (95)

1.47

40 (104)

1.23

45 (113)

1.04

F
WJIA0091E

MTC

If NG, replace intake sensor.
K

DIAGNOSTIC PROCEDURE
SYMPTOM: Intake sensor circuit is open or shorted.

WJIA0177E

Revision: May 2004

MTC-65

2002 Altima

TROUBLE DIAGNOSIS

1. CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND BODY GROUND
Disconnect intake sensor harness connector.
Terminal
Connector

Wire color

M53-1

Continuity
Body ground

Yes

OK or NG
OK
>> GO TO 2.
NG
>> Repair harness or connector.
WJIA0178E

2. CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND A/C CONTROL UNIT
Disconnect A/C control unit harness connector.
Terminals
Connector
M53-2

Wire color
R/G

Continuity

Connector

Wire color

M51-6

R/G

Yes

OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
WJIA0179E

3. CHECK INTAKE SENSOR
Refer to MTC-65, "Intake Sensor" .
OK or NG
OK
>> Replace A/C control unit.
NG
>> Replace intake sensor.

Revision: May 2004

MTC-66

2002 Altima

CONTROL UNIT
CONTROL UNIT
Removal and Installation

PFP:27500

A
EJS00101

REMOVAL
1.
2.
3.

Remove cluster lid C. Refer to IP-12, "Cluster Lid C" .
Remove audio unit. Refer to AV-22, "AUDIO UNIT" .
Remove the temperature control cable clamp and then remove
the cable from the air mix door lever.

E
WJIA0192E

4.
5.

Remove the A/C control unit screws and then remove it from the
instrument panel.
Disconnect the A/C control unit connectors and then remove it.

I
WJIA0191E

INSTALLATION

MTC

Installation is in the reverse order of removal.

Adjustment
1. Attach temperature control cable.
2. Rotate control knob to full cold position.
3. Remove slack from cable and install temperature control cable clamp.
After positioning control cable, check for proper operation.

Revision: May 2004

MTC-67

2002 Altima

INTAKE SENSOR
INTAKE SENSOR
Removal and Installation
1.
2.

PFP:27723
EJS00102

Remove the evaporator. Refer to MTC-90, "Removal and Installation for Evaporator" .
Remove the intake sensor clip and then the sensor.
CAUTION:
Be careful not to damage the core surface.

WJIA0100E

Revision: May 2004

MTC-68

2002 Altima

BLOWER UNIT
BLOWER UNIT
Removal and Installation

PFP:27200

A
EJS00103

REMOVAL
1.
2.
3.

Remove the glove box assembly. Refer to IP-15, "Glove Box" .
Remove the ECM.
Disconnect the blower motor, intake door motor and fan control amp. connector.

Remove the 2 bolts and 1 screw from the blower unit, then
remove it.

F
WJIA0101E

MTC

Revision: May 2004

MTC-69

2002 Altima

BLOWER MOTOR
BLOWER MOTOR
Removal and Installation
1.
2.

PFP:27226
EJS00104

Remove the blower unit. Refer to MTC-69, "Removal and Installation" .
Release the 8 tabs attaching blower motor to blower unit case
and then remove it.

WJIA0104E

Revision: May 2004

MTC-70

2002 Altima

INTAKE DOOR MOTOR
INTAKE DOOR MOTOR
Removal and Installation
1.
2.

PFP:27730

A
EJS00105

Remove the blower unit. Refer to MTC-69, "Removal and Installation" .
Remove the screws and then the intake door motor from the
blower unit.

WJIA0105E

MTC

Revision: May 2004

MTC-71

2002 Altima

IN-CABIN MICROFILTER
IN-CABIN MICROFILTER
Removal and Installation

PFP:27277
EJS001LK

FUNCTION
Air inside passenger compartment is kept clean at either recirculation or fresh mode by installing in-cabin microfilter into blower unit.

LJIA0012E

REPLACEMENT TIMING
Replace in-cabin microfilter.
Refer to MA-7, "SCHEDULE 1" and MA-10, "SCHEDULE 2" .
Caution label is fixed inside the glove box.

SHA868E

REPLACEMENT PROCEDURES
1.
2.
3.
4.
5.

Remove glove box assembly. Refer to IP-15, "Glove Box" .
Remove in-cabin microfilter cover.
Take out the ventilation air filter from blower unit.
Replace with new in-cabin microfilter and reinstall on blower
unit.
Reinstall glove box assembly.

LJIA0013E

Revision: May 2004

MTC-72

2002 Altima

HEATER & COOLING UNIT ASSEMBLY
HEATER & COOLING UNIT ASSEMBLY
Removal and Installation

PFP:27110

A
EJS00106

REMOVAL
1.
2.
3.
4.

5.
6.
7.

Discharge refrigerant from A/C system. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
Drain coolant from cooling system. Refer to MA-14, "Changing Engine Coolant" (QR25DE models) or
MA-22, "Changing Engine Coolant" (VQ35DE models).
Disconnect heater hoses from heater core pipes.
Disconnect refrigerant lines from evaporator.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid entry of air.
Remove the instrument panel. Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY" .
Remove the blower unit. Refer to MTC-69, "Removal and Installation" .
Remove the temperature control cable clamp and then remove
the cable from the air mix door lever.

WJIA0192E

8.
9.

Disconnect mode door motor connector.
Remove the heater and cooling unit.

MTC

K
WJIA0200E

INSTALLATION
Install in the reverse order of removal.
NOTE:
When filling radiator with coolant, refer to CO-11, "Refilling Engine Coolant" (QR25DE models) or CO-33,
"Refilling Engine Coolant" (VQ35DE models). Recharge the A/C system. Refer to MTC-79, "HFC-134a (R134a) Service Procedure" .

Revision: May 2004

MTC-73

2002 Altima

HEATER CORE
HEATER CORE
Removal and Installation
1.
2.

PFP:27140
EJS00107

Remove heater and cooling unit. Refer to MTC-73, "Removal and Installation" .
Remove heater core pipe support screws and then remove it.

WJIA0185E

Remove heater core cover screws and then remove it.

WJIA0127E

Remove heater core.

WJIA0186E

Revision: May 2004

MTC-74

2002 Altima

MODE DOOR MOTOR
MODE DOOR MOTOR
Removal and Installation

PFP:27731

A
EJS00108

DRIVER SIDE MODE DOOR MOTOR
1.
2.
3.

Remove the driver lower instrument panel assembly. Refer to IP-13, "Driver Lower Instrument Panel" .
Disconnect the mode door motor connector.
Remove the mode door motor screws and then remove it.

E
WJIA0200E

MTC

Revision: May 2004

MTC-75

2002 Altima

BLOWER FAN RESISTER
BLOWER FAN RESISTER
Removal and Installation
1.
2.

PFP:27150
EJS00109

Disconnect blower motor resistor connector.
Remove blower motor resistor screws and then remove it.

WJIA0193E

Revision: May 2004

MTC-76

2002 Altima

DUCTS AND GRILLES
DUCTS AND GRILLES
Removal and Installation
Ventilator Duct, Defroster Nozzle and Defroster Ducts

PFP:27860

A
EJS0010A

EJS0010B

WJIA0112E

Center Ventilator Grille
1.
2.

MTC

EJS0010C

Remove cluster lid D. Refer to IP-13, "Cluster Lid D" .
Release the tabs to remove center ventilator grille.

WJIA0113E

Side Ventilator Grille LH
1.
2.

EJS0010D

Remove cluster lid A. Refer to IP-13, "Cluster Lid A" .
Remove side ventilator grille LH.

WJIA0114E

Revision: May 2004

MTC-77

2002 Altima

DUCTS AND GRILLES
Side Ventilator Grille RH
1.
2.

EJS0010E

Remove glove box assembly. Refer to IP-15, "Glove Box" .
Remove side ventilator grille RH screw and then remove it.

WJIA0108E

Floor duct
1.
2.

EJS0010F

Remove the carpet. Refer to EI-32, "FLOOR TRIM" .
Release foam tape and slide floor duct rearward to release from clips.

WJIA0115E

Revision: May 2004

MTC-78

2002 Altima

REFRIGERANT LINES
REFRIGERANT LINES
HFC-134a (R-134a) Service Procedure

PFP:92600

A
EJS0010G

SETTING OF SERVICE TOOLS AND EQUIPMENT
Discharging Refrigerant

WARNING:
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from A/C system using certified service equipment meeting
requirements of SAE J2210 (R-134a recycling equipment) or J2201 (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.

I
SHA179FD

MTC

Evacuating System and Charging Refrigerant

SHA180FD

Revision: May 2004

MTC-79

2002 Altima

REFRIGERANT LINES

SHA251F

MTC-18, "LUBRICANT"

MTC-91, "Checking for Refrigerant
Leaks"

MTC-59, "Performance Chart"

Components

MTC-3, "Contaminated Refrigerant"

EJS0010H

Refer to MTC-5, "Precautions for Refrigerant Connection" .
Revision: May 2004

MTC-80

2002 Altima

REFRIGERANT LINES
QR25DE Models
A

MTC

WJIA0180E

Revision: May 2004

MTC-81

2002 Altima

REFRIGERANT LINES
VQ35DE Models

WJIA0116E

Revision: May 2004

MTC-82

2002 Altima

REFRIGERANT LINES
Removal and Installation for Compressor — QR25DE Models

EJS0010I

WJIA0182E

REMOVAL
1.
2.
3.
4.

Discharge the refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
Remove the drive belt.
Refer to MA-14, "ENGINE MAINTENANCE (QR25DE ENGINE)" .
Disconnect the compressor connector.
Remove the high-pressure flexible hose and low-pressure flexible hose.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
Remove the mounting bolts from compressor using power tools.

MTC

INSTALLATION

CAUTION:
●
Replace the O-ring of the low-pressure flexible hose and high-pressure flexible hose with a new
one, then apply compressor oil to it when installing it.
●
When charging refrigerant, check for leaks.

Bolts mounting the compressor
Tightening torque
: 28.4 - 33.3 N·m (2.9 - 3.4 kg-m, 21 - 24 ft-lb)
Tightening torque
: 59.8 - 69.6 N·m (6.1 - 7.0 kg-m, 45 - 51 ft-lb)
Bolt mounting the high- and low-pressure flexible hoses
Tightening torque
: 7.8 - 19.6 N·m (0.8 - 1.9 kg-m, 69 - 173 in-lb)

Revision: May 2004

MTC-83

2002 Altima

REFRIGERANT LINES
Removal and Installation for Compressor — VQ35DE Models

EJS0010J

WJIA0117E

REMOVAL
1.
2.
3.
4.
5.
6.

Discharge the refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
Remove the drive belt.
Refer to MA-21, "ENGINE MAINTENANCE (VQ35DE ENGINE)" .
Remove the coolant pipe bracket bolt.
Remove compressor mounting stud.
Disconnect the compressor connector.
Remove the high-pressure flexible hose and low-pressure flexible hose.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
Remove the mounting bolts and nut from compressor using power tools.

INSTALLATION
CAUTION:
●
Replace the O-ring of the low-pressure flexible hose and high-pressure flexible hose with a new
one, then apply compressor oil to it when installing it.
●
When charging refrigerant, check for leaks.
Bolts mounting the compressor (rear side)
Tightening torque
: 56.9 - 65.7 N·m (5.8 - 6.8 kg-m, 42 - 48 ft-lb)
Bolt mounting the compressor (front side)
Tightening torque
: 28.4 - 33.3 N·m (2.9 - 3.4 kg-m, 21 - 24 ft-lb)
Nut mounting the compressor (front side)
Tightening torque
: 59.8 - 69.6 N·m (6.1 - 7.0 kg-m, 45 - 51 ft-lb)
Bolt mounting the high- and low-pressure flexible hoses
Tightening torque
: 7.8 - 19.6 N·m (0.8 - 1.9 kg-m, 69 - 173 in-lb)

Revision: May 2004

MTC-84

2002 Altima

REFRIGERANT LINES
Removal and Installation for Compressor Clutch

EJS0010K

REMOVAL
●
●

When removing center bolt, hold clutch disc with clutch disc tool.
Remove the clutch disc.
Clutch disc holding tool:
(J-44614) Commercial service tool

D
WHA228

●

Remove the snap ring using external snap ring pliers.

RHA072C

●

Pulley removal:
I

MTC

K
LHA173

WHA212

●
●

Use a pulley puller with small adapter. Position the small adapter on the end of the drive shaft and the
center of the puller on the small adapter. Remove the pulley assembly with the puller.
To prevent deformation of the pulley groove, the puller claws should be hooked under (not into)
the pulley groove.
Remove the snap ring using external snap ring pliers.
Remove the magnet coil harness clip using a screwdriver, remove the three magnet coil fixing screws and
remove the magnet coil.

Revision: May 2004

MTC-85

2002 Altima

REFRIGERANT LINES
INSPECTION
Clutch Disc

WHA183

If the contact surface shows signs of damage due to excessive heat, replace clutch disc and pulley.

Pulley
Check the appearance of the pulley assembly. If contact surface of pulley shows signs of excessive grooving,
replace clutch disc and pulley. The contact surfaces of the pulley assembly should be cleaned with a suitable
solvent before reinstallation.

Coil
Check magnet coil for loose connection or cracked insulation.

INSTALLATION
●

●

Install the magnet coil.
Be sure to align the magnet coil pin with the hole in the
compressor front head.
Install the magnet coil harness clip using a screwdriver.

WHA213

●

Install the pulley assembly using the installer and a wrench, and
then install the snap ring using snap ring pliers.

LHA174

●

Install the clutch disc on the drive shaft, together with the original
shim(s). Press the clutch disc down by hand.

WHA184

Revision: May 2004

MTC-86

2002 Altima

REFRIGERANT LINES
●

●

Using the clutch disc tool to prevent clutch disc rotation, tighten
the bolt to 12 N·m (1.2 kg-m, 9 ft-lb).
After tightening the bolt, check that the pulley rotates
smoothly.

C
WHA229

D
●

Check clearance all the way around the clutch disc.
Clutch disc-to-pulley
clearance

: 0.3 - 0.6 mm (0.012 - 0.024 in)

If the specified clearance is not obtained, replace adjusting
spacer and readjust.

MTC

WHA194

BREAK-IN OPERATION
When replacing compressor clutch assembly, always conduct the break-in operation. This is done by engaging and disengaging the clutch about 30 times. Break-in operation raises the level of transmitted torque.

Removal and Installation for Low-pressure Flexible Hose

EJS0010L

REMOVAL
1. Discharge the refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
2. Remove the low-pressure flexible hose. Refer to MTC-80, "Components" .

INSTALLATION
CAUTION:
●
Replace the O-ring of the low-pressure flexible hose with a new one, then apply compressor oil to
it when installing it.
●
When charging refrigerant, check for leaks.
Bolt mounting the low-pressure flexible hose (evaporator side)
Tightening torque
: 2.9 - 5.9 N·m (0.29 - 0.60 kg-m, 26 - 52 in-lb)
Bolt mounting the low-pressure flexible hose (compressor side)
Tightening torque
: 7.8 - 19.6 N·m (0.8 - 1.9 kg-m, 69 - 173 in-lb)

Revision: May 2004

MTC-87

2002 Altima

REFRIGERANT LINES
Bolt connecting the low-pressure flexible hose in-line connection (VQ35DE models)
Tightening torque
: 7.8 - 19.6 N·m (0.8 - 1.9 kg-m, 69 - 173 in-lb)

Removal and Installation for High-pressure flexible hose

EJS0010M

REMOVAL
1. Discharge the refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
2. Remove the high-pressure flexible hose. Refer to MTC-80, "Components" .
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.

INSTALLATION
CAUTION:
●
Replace the O-ring of the high-pressure flexible hose with a new one, then apply compressor oil to
it when installing it.
●
When charging refrigerant, check for leaks.
Bolts mounting the high-pressure flexible hose
Tightening torque
: 7.8 - 19.6 N·m (0.8 - 1.9 kg-m, 69 - 173 in-lb)

Removal and Installation for High-pressure Pipe

EJS0010N

REMOVAL
1. Discharge the refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
2. Remove the high-pressure pipe. Refer to MTC-80, "Components" .
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.

INSTALLATION
CAUTION:
●
Replace the O-ring of the high-pressure pipe with a new one, then apply compressor oil to it when
installing it.
●
When charging refrigerant, check for leaks.
Bolt mounting the high-pressure pipe (evaporator side)
Tightening torque
: 2.9 - 5.9 N·m (0.29 - 0.60 kg-m, 26 - 52 in-lb)
Bolt mounting the high-pressure pipe (condenser side)
Tightening torque
: 7.8 - 19.6 N·m (0.8 - 1.9 kg-m, 69 - 173 in-lb)

Removal and Installation for Refrigerant Pressure Sensor

EJS0010O

1.
2.

Discharge the refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
Disconnect the refrigerant pressure sensor connector and
remove the refrigerant pressure sensor from condenser.
CAUTION:
●
Please be careful not to damage the condenser fins.
●
Apply compressor oil to the O-ring of the refrigerant pressure sensor when installing it.
Tightening
torque

: 9.8 - 11.7 N·m (1.0 - 1.2 kg-m, 7.3 - 8.6 ftlb)
WJIA0123E

Removal and Installation for Condenser

EJS0010P

REMOVAL
1.
2.

Discharge the refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
Remove the radiator. Refer to CO-34, "RADIATOR" .
CAUTION:
Be careful not to damage the core surface of the condenser and the radiator.

Revision: May 2004

MTC-88

2002 Altima

REFRIGERANT LINES
3.

4.
5.

Disconnect the high-pressure flexible hose and the high-pressure pipe from the condenser.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air.
Disconnect the refrigerant pressure sensor connector.
Remove the front fascia. Refer to EI-13, "FRONT BUMPER" .

C
WJIA0124E

Remove the mounting nuts from condenser mounting brackets.
E

G
WJIA0125E

INSTALLATION

CAUTION:
●
Replace the O-rings of the high-pressure pipe and the high-pressure flexible hose with new ones,
then apply compressor oil to them after installing them.
●
When charging refrigerant, check for leaks.
High-pressure flexible hose and pipe mounting bolt
Tightening torque
: 7.8 - 19.6 N·m (0.8 - 1.9 kg-m, 69 - 173 in-lb)
Condenser mounting nuts
Tightening torque
: 5.0 - 6.79 N·m (0.51 - 0.69 kg-m, 45 - 60 in-lb)

Removal and Installation for Liquid Tank

MTC

K
EJS0010Q

WJIA0183E

1.
2.

Discharge the refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
Remove the battery.

Revision: May 2004

MTC-89

2002 Altima

REFRIGERANT LINES
3.
4.
5.
6.

Remove the hood switch (if equipped).
Remove the engine undercover using power tools.
Remove the bolt and line clamp.
Loosen the tank clamp and remove the liquid tank.

Removal and Installation for Evaporator

EJS00317

REMOVAL
1.

Evacuate and recover the A/C system refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service Procedure" .
2. Disconnect the battery negative terminal.
3. Disconnect the air cleaner to electronic throttle control actuator tube. Refer to EM-16, "AIR CLEANER
AND AIR DUCT" (QR25DE), EM-112, "AIR CLEANER AND AIR DUCT" (VQ35DE).
NOTE:
The tube is located between the air cleaner assembly and the intake manifold and is removed to access
the expansion valve.
4. Disconnect the A/C pipe from the expansion valve.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
5. Remove the cooler grommet.
6. Remove the expansion valve.
7. Remove the center console side finisher RH. Refer to IP-16,
"Center Console" .
8. Remove the glove box assembly. Refer to IP-15, "Glove Box" .
9. Remove the ECM.
● Disconnect the ECM connector.
● Remove the wire harness from the ECM mounting bracket.
● Remove the two ECM mounting bracket nuts and disconnect
WJIA0128E
the ground wire.
10. Remove the blower unit. Refer to MTC-69, "BLOWER UNIT" .
11. Remove the heater core cover.

WJIA0127E

12. Remove the evaporator cover.

WJIA0188E

Revision: May 2004

MTC-90

2002 Altima

REFRIGERANT LINES
13. Remove the evaporator.
● Remove the thermo control amplifier.
● Remove the intake sensor.
CAUTION:
● Mark the mounting position of the intake sensor and
thermo control amplifier.

C
WJIA0190E

INSTALLATION
Installation is in the reverse order of removal.
Expansion valve mounting bolts

: 2.9 - 5.0 N·m (0.29 - 0.51 kg-m, 26 - 44 in-lb)

CAUTION:
●
Replace the O-rings with new ones, then apply compressor oil to them when installing them.
F

Removal and Installation for Expansion Valve

EJS00318

REMOVAL
1.
2.

4.
5.

Evacuate and recover the A/C system refrigerant. Refer to MTC-79, "HFC-134a (R-134a) Service ProceG
dure" .
Disconnect the air cleaner to electronic throttle control actuator tube. Refer to EM-16, "AIR CLEANER
AND AIR DUCT" (QR25DE), EM-112, "AIR CLEANER AND AIR DUCT" (VQ35DE).
H
NOTE:
The tube is located between the air cleaner assembly and the intake manifold and is removed to access
the expansion valve.
I
Disconnect the A/C pipe from the expansion valve.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
MTC
Remove the cooler grommet.
Remove the expansion valve.
K

WJIA0128E

INSTALLATION
Installation is in the reverse order of removal.
Expansion valve mounting bolts

: 2.9 - 5.0 N·m (0.29 - 0.51 kg-m, 26 - 44 in-lb)

CAUTION:
●
Replace the O-rings with new ones, then apply compressor oil to them when installing them.

Checking for Refrigerant Leaks

EJS0010T

Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C lubricant
leakage, damage and corrosion. A/C lubricant leakage may indicate an area of refrigerant leakage. Allow
extra inspection time in these areas when using either an electronic refrigerant leak detector or fluorescent
dye leak detector.
If dye is observed, confirm the leak with an electronic refrigerant leak detector. It is possible a prior leak was
repaired and not properly cleaned.
When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all
system components and connections.
Revision: May 2004

MTC-91

2002 Altima

REFRIGERANT LINES
When searching for refrigerant leaks using an electronic leak detector, move the probe along the suspected
leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the component.
CAUTION:
Moving the electronic leak detector probe slower and closer to the suspected leak area will improve
the chances of finding a leak.

Checking System for Leaks Using the Fluorescent Leak Detector

EJS0010U

Check A/C system for leaks using the UV lamp and safety glasses (J-42220) in a low sunlight area (area
without windows preferable). Illuminate all components, fittings and lines. The dye will appear as a bright
green/yellow area at the point of leakage. Fluorescent dye observed at the evaporator drain opening indicates an evaporator core assembly (tubes, core or TXV) leak.
2. If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, with the UV lamp for dye residue.
3. After the leak is repaired, remove any residual dye using dye cleaner (J-43872) to prevent future misdiagnosis.
4. Perform a system performance check and verify the leak repair with an approved electronic refrigerant
leak detector.
NOTE:
Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield
washer fluid, solvents and lubricants, may falsely trigger the leak detector. Make sure the surfaces to be
checked are clean.
Clean with a dry cloth or blow off with shop air.
Do not allow the sensor tip of the detector to contact with any substance. This can also cause false readings
and may damage the detector.

Dye Injection

EJS0010V

(This procedure is only necessary when recharging the system or when the compressor has seized and was
replaced.)
1. Check A/C system static (at rest) pressure. Pressure must be at least 345 kPa (50 psi).
2. Pour one bottle (1/4 ounce / 7.4 cc) of the A/C refrigerant dye into the injector tool (J-41459).
3. Connect the injector tool to the A/C LOW PRESSURE side service fitting.
4. Start engine and switch A/C ON.
5. When the A/C operating (compressor running), inject one bottle (1/4 ounce / 7.4 cc) of fluorescent dye
through the low-pressure service valve using dye injector tool J-41459 (refer to the manufacturer's operating instructions).
6. With the engine still running, disconnect the injector tool from the service fitting.
CAUTION:
Be careful the A/C system or replacing a component, pour the dye directly into the open system connection and proceed with the service procedures.
7. Operate the A/C system for a minimum of 20 minutes to mix the dye with the system oil. Depending on the
leak size, operating conditions and location of the leak, it may take from minutes to days for the dye to
penetrate a leak and become visible.

Electronic Refrigerant Leak Detector

EJS0010W

PRECAUTIONS FOR HANDLING LEAK DETECTOR
When performing a refrigerant leak check, use a J-41995 A/C leak
detector or equivalent. Ensure that the instrument is calibrated and
set properly per the operating instructions.
The leak detector is a delicate device. In order to use the leak detector properly, read the operating instructions and perform any specified maintenance.

SHA196FA

Revision: May 2004

MTC-92

2002 Altima

REFRIGERANT LINES
1.

Position probe approximately 5 mm (3/16 in) away from point to
be checked.

C
SHA707EA

When testing, circle each fitting completely with probe.
E

G
SHA706E

Move probe along component approximately 25 to 50 mm (1 to
2 in)/sec.

MTC

K
SHA708EA

CHECKING PROCEDURE
To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette
smoke in the vicinity of the vehicle. Perform the leak test in calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.
1. Turn engine OFF.
2. Connect a suitable A/C manifold gauge set to the A/C service ports.
Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm2 , 50 psi) above 16°C (61°F). If less
than specification, recover/evacuate and recharge the system with the specified amount of refrigerant.
NOTE:
At temperatures below 16°C (61°F), leaks may not be detected since the system may not reach 345 kPa (3.54
kg/cm2 , 50 psi).
4. Conduct the leak test from the high side (compressor discharge a to evaporator inlet f) to the low side
[evaporator drain hose g to shaft seal k (QR25DE models) or l (VQ35DE models)]. Refer to MTC-80 . Perform a leak check for the following areas carefully. Clean the component to be checked and move the leak
detected probe completely around the connection/component.
Compressor
Check the fitting of high- and low-pressure hoses, relief valve and shaft seal.
Liquid tank
Check the refrigerant pressure sensor.
Service valves
Check all around the service valves. Ensure service valve caps are secured on the service valves (to prevent leaks).

Revision: May 2004

MTC-93

2002 Altima

REFRIGERANT LINES
NOTE:
After removing A/C manifold gauge set from service valves, wipe any residue from valves to prevent any
false readings by leak detector.
Cooling unit (Evaporator)
With engine OFF, turn blower fan on "High" for at least 15 seconds to dissipate any refrigerant trace in the
cooling unit. Wait a minimum of 10 minutes accumulation time (refer to the manufacturer's recommended
procedure for actual wait time) before inserting the leak detector probe into the drain hose.
Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water
or dirt that may be in the drain hose.
5. If a leak detector detects a leak, verify at least once by blowing compressed air into area of suspected
leak, then repeat check as outlined above.
6. Do not stop when one leak is found. Continue to check for additional leaks at all system components.
If no leaks are found, perform steps 7 - 10.
7. Start engine.
8. Set the heater A/C control as follows;
a. A/C switch: ON
b. Face mode
c. Intake position: Recirculation
d. Max cold temperature
e. Fan speed: High
9. Run engine at 1,500 rpm for at least 2 minutes.
10. Turn engine off and perform leak check again following steps 4 through 6 above.
Refrigerant leaks should be checked immediately after stopping the
engine. Begin with the leak detector at the compressor. The pressure on the high pressure side will gradually drop after refrigerant
circulation stops and pressure on the low pressure side will gradually
rise, as shown in the graph. Some leaks are more easily detected
when pressure is high.

SHA839E

11. Before connecting ACR4 to vehicle, check ACR4 gauges. No refrigerant pressure should be displayed. If
pressure is displayed, recover refrigerant from equipment lines and then check refrigerant purity.
12. Confirm refrigerant purity in supply tank using ACR4 and refrigerant identifier.
13. Confirm refrigerant purity in vehicle A/C system using ACR4 and refrigerant identifier.
14. Discharge A/C system using approved refrigerant recovery equipment. Repair the leaking fitting or component as necessary.
15. Evacuate and recharge A/C system and perform the leak test to confirm no refrigerant leaks.
16. Conduct A/C performance test to ensure system works properly.

Revision: May 2004

MTC-94

2002 Altima

SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Service Data and Specifications (SDS)

PFP:00030

A
EJS0010X

COMPRESSOR
B

Model

CALSONIC KANSEI make

Type

DKS-17D

Displacement
cm3 (cu in)/rev

175.5 (10.7)/rev

Cylinder bore × stroke
mm (in)

30.5 (1.201) x 21.4 (0.84)

Direction of rotation

Clockwise (viewed from drive end)

Drive belt

Poly V

LUBRICANT

Model

CALSONIC KANSEI make DKS-17D

Name

Nissan A/C System Oil Type DH-PS

Part number

KLH00-PAGS0

Capacity
m (US fl oz, lmp fl oz)

Total in system

150 (5.03, 5.3)

Compressor (Service part) charging amount

150 (5.03, 5.3)

REFRIGERANT

Type

HFC-134a (R-134a)

Capacity
kg (lb)

0.475 - 0.525 (1.045 - 1.155)

ENGINE IDLING SPEED
Refer to EC-38, "Idle Speed and Ignition Timing Check" (QR25DE models) or EC-656, "Idle Speed and Igni- MTC
tion Timing Check" (VQ35DE models).

BELT TENSION
Refer to MA-14, "ENGINE MAINTENANCE (QR25DE ENGINE)"
(VQ35DE ENGINE)" .

or MA-21, "ENGINE MAINTENANCE

Revision: May 2004

MTC-95

2002 Altima

SERVICE DATA AND SPECIFICATIONS (SDS)

Revision: May 2004

MTC-96

2002 Altima

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Nissan 2002 Altima Owners Manual MTC

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