Nissan Maxima 2007 User Manual

Edition: May 2006
Revision: May 2006
Publication No. SM7E-1A34U0

QUICK REFERENCE INDEX

A

GENERAL INFORMATION

B ENGINE

C

TRANSMISSION/
TRANSAXLE

D DRIVELINE/AXLE

E SUSPENSION

F BRAKES

G STEERING
H RESTRAINTS

I BODY

J AIR CONDITIONER

K ELECTRICAL

L MAINTENANCE
M INDEX

GI

General Information

EM

Engine Mechanical

LU

Engine Lubrication System

CO

Engine Cooling System

EC

Engine Control System

FL

Fuel System

EX

Exhaust System

ACC

Accelerator Control System

CVT

CVT

FAX

Front Axle

RAX

Rear Axle

FSU

Front Suspension

RSU

Rear Suspension

WT

Road Wheels & Tires

BR

Brake System

PB

Parking Brake System

BRC

Brake Control System

PS

Power Steering System

SB

Seat Belts

SRS

Supplemental Restraint System (SRS)

BL

Body, Lock & Security System

GW

Glasses, Window System & Mirrors

RF

Roof

EI

Exterior & Interior

IP

Instrument Panel

SE

Seat

ATC

Automatic Air Conditioner

SC

Starting & Charging System

LT

Lighting System

DI

Driver Information System

WW

Wiper, Washer & Horn

BCS

Body Control System

LAN

LAN System

AV

Audio Visual, Navigation & Telephone System

ACS

Auto Cruise Control System

PG

Power Supply, Ground & Circuit Elements

MA

Maintenance

IDX

Alphabetical Index

A
B
C
D
E

F

G

H

I

J

K

L

M

© 2006 NISSAN NORTH AMERICA, INC.
All rights reserved. No p a rt of this Se rvice Man ual may be reproduc ed or sto re d in a retrie val system, or tran smitted in any
form, or by any means, electronic, mecha nical, photo-co pying, recording or oth erwise, without the prio r written permissi on
of Nissan North America, Inc., Gardena, California.

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This manual contains maintenance and repair procedures for the
2007 NISSAN MAXIMA.

In order to assure your safety and the efficient functioning of the vehicle,
this manual should be read thoroughly. It is especially important that the
PRECAUTIONS in the GI section be completely understood before starting
any repair task.

All information in this manual is based on the latest product information
at the time of publication. The right is reserved to make changes in specifi­cations and methods at any time without notice.

IMPORTANT SAFETY NOTICE

The proper performance of service is essential for both the safety of
the technician and the efficient functioning of the vehicle.
The service methods in this Service Manual are described in such a
manner that the service may be performed safely and accurately.
Service varies with the procedures used, the skills of the technician
and the tools and parts available. Accordingly, anyone using service
procedures, tools or parts which are not specifically recommended
by NISSAN must first be completely satisfied that neither personal
safety nor the vehicle’s safety will be jeopardized by the service
method selected.

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PLEASE HELP MAKE THIS SERVICE MANUAL BETTER!

Your comments are important to NISSAN and will help us to improve our Service Manuals.

Use this form to report any issues or comments you may have regarding our Service Manuals.

Please print this form and type or write your comments below. Mail or fax to:

Nissan North America, Inc.
Technical Service Information
39001 Sunrise Drive, P.O. Box 9200
Farmington Hills, MI USA 48331
FAX: [phone]

SERVICE MANUAL: Model: Year:

PUBLICATION NO. (Refer to Quick Reference Index ):

Please describe any Service Manual issues or problems in detail:

Page number(s)

Note: Please include a copy of each page, marked with your comments.

Are the trouble diagnosis procedures logical and easy to use? (circle your answer) YES NO

If no, what page number(s)?

Please describe the issue or problem in detail:

Is the organization of the manual clear and easy to follow? (circle your answer) YES NO

Please comment:

What information should be included in NISSAN Service Manuals to better support you in servicing or
repairing customer vehicles?

Note: Please include a copy of each page, marked with your comments.

DATE: YOUR NAME: POSITION:

DEALER: DEALER NO.: ADDRESS:

CITY: STATE/PROV./COUNTRY: ZIP/POSTAL CODE:

QUICK REFERENCE CHART: MAXIMA

2007

QUICK REFERENCE CHART: MAXIMA PFP:00000

Engine Tune-Up Data ELS001PU

Cylinder arrangement V-6
Displacement
Bore and stroke 95.5 x 81.4 mm (3.76 x 3.205 in)

Valve arrangement DOHC
Firing order 1-2-3-4-5-6

Number of piston ring s

Number of main bearings 4
Compression ratio 10.3:1

Compression pressure

Compression 2
Oil 1

Standard
Minimum
Differential limit between cylinders

1,275 kPa (13.0 cm

3,498 cm

981 kPa (10.0 cm

98 kPa (1.0 cm

3

(213.45 in3 )

2

, 185 psi) / 300 rpm

2

, 142 psi) / 300 rpm

2

, 14 psi) / 300 rpm

Cylinder number

SEM713A

Valve timing (IVTC - OFF)

PBIC0187E

abcdef

240° 238° - 6° 64° 8° 52°

Unit: degree

QUICK REFERENCE CHART: MAXIMA

Spark Plugs (Double-Platinum Tipped)

Make NGK
Part number DILFR5A11
Gap (nominal) 1.1 mm (0.043 in)

Drive Belt Deflection and Tension

2007

Deflection adjustment Unit: mm (in) Tension adjustment* Unit: N (kg, lb)

Used belt

Limit After adjustment Limit After adjustment

Alternator and
air conditioning
compressor

Power steering
pump

Applied pushing
force

*: If belt tension gauge cannot be installed at check points shown , che ck dr iv e belt tensi on at different locat ion on th e bel t.

7 (0.28)

11 (0.43)

98 (10, 22) —

4.2 - 4.6
(0.17 - 0.18)

7.3 - 8
(0.29 - 0.30)

New belt

3.7 - 4.1
(0.15 - 0.16)

6.5 - 7.2
(0.26 - 0.28)

294 (30, 66)

196 (20, 44)

Used belt

730 - 818

(74.5 - 83.5,

164 - 184)

495 - 583

(50.5 - 59.5,

111 - 131)

LBIA0076E

New belt

838 - 926

(85.5 - 94.5,

188 - 208)

603 - 691

(61.5 - 70.5,

135.6 - 155.4)

QUICK REFERENCE CHART: MAXIMA

2007

Front Wheel Alignmen t (Unladen*1) ELS001PV

Market United States and Canada Mexico
Tire size 225/55R17 245/45R18 All
Camber

degree minute (decimal degree)

Caster
degree minute (decimal degree)

Kingpin inclination
degree minute (decimal degree)

Minimum −1°00′ (−1.00°) −0°50′ (−0.83°)
Nominal −0°15′ (−0.25°) −0°05′ (−0.08°)
Maximum 0°30′ (0.50°)0°40′ (0.67°)

Left and right difference 45′ (0.75°) or less
Minimum 2°05′ (2.08°)1°55′ (1.92°)

Nominal 2°50′ (2.83°)2°40′ (2.6 7 °)
Maximum 3°35′ (3.58°)3°25′ (3.42°)

Left and right difference 45′ (0.75°) or less

Minimum 13°50′ (13.83°)13°10′ (13.17°)
Nominal 14°35′ (14.58°)13°55′ (13.92°)
Maximum 15°20′ (15.33°)14°40′ (14.67°)

45′ (0.75°) or

less

45′ (0.75°) or

less

SFA234AC

Total toe-in

Distance (A − B)
mm (in)

Angle (left plus right)
degree minute (decimal
degree)

Wheel turning
angle
full turn*2

*1: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand tools and ma ts in designate d posi t ions.
*2: On power steering m odels, wheel turning force (at circumferenc e of steering wheel) of 98 to 147 N (10 t o 15 kg, 22 to 33 l b) with
engine idle.

Inside
degree minute (decimal
degree)

Outside
degree minute (decimal
degree)

Minimum −0.5 (−0.020) 0.0 (0.000)
Nominal 0.5 (0.020) 1.0 (0.040)
Maximum 1.5 (0.059) 2.0 (0.080)
Minimum — —
Nominal 2′ (0.03°)3′ (0.05°)
Maximum — —
Minimum 32°00′ (32.0°)31°00′ (31.0°)—
Nominal 35°30′ (35.5°)34°30′ (34.5°)—
Maximum 36°30′ (36.5°)35°30′ (35.5°)—

Nominal 29°00′ (29.0°)28°30′ (28.5°)—

QUICK REFERENCE CHART: MAXIMA

2007

Rear Wheel Alignment (Unladen*) ELS001PW

Market

Minimum -0° 08' (-0.13°)-0° 30' (-0.5°)
Camber
Degree minute (Decimal degree)

Distance (A − B)
mm (in)

Distance difference

Total toe-in

*: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand tools and ma ts in design ated posi t io ns.

between RH and LH side
mm (in)

Angle (left plus right)
Degree minute (Decimal degree)

Nominal -0° 38′ (-0.63°)0° 0' (0°)

Maximum -0° 68′ (-1.13°)0° 30' (0.5°)

SFA234AC

Minimum 2.3 (0.091) 1.3 (0.051)

Nominal 3.8 (0.150) 2.8 (0.110)

Maximum 5.3 (0.209) 4.3 (0.169)

Minimum -2.0 (-0.079)

Nominal 0 (0)

Maximum 2.0 (0.079)

Minimum 0° 6′ (0.10°)0° 3' (0.05°)

Nominal 0° 10′ (0.17°)0° 7' (0.12°)

Maximum 0° 14′ (0.23°)0° 11' (0.18°)

United States

and Canada

Mexico

Brake ELS001PX

Unit: mm (in)
Brake mode l CLZ25VE disc brake
Cylinder bore diameter 57.2 (2.25)

Front brake

Rear brake

Master cylinder Cylinder bore diame te r 23.81 (15/16)
Control valve Screw in type 30 × 0.4 (1.18 × 0.02)

Brake booster

Recommended brake fluid

Pad
Length × width × thickness

Rotor outer diameter × thickness 320 × 28 (12.60 × 1.10)
Brake model AD9A disc brake
Cylinder bore diameter 34.9 (1.374)
Pad

Length × width × thickness
Rotor outer diameter × thickness 292 × 9 (11.50 × 0.35)

Booster model M215T

Diaphragm diameter

Primary 230 (9.06)
Secondary 205 (8 .07 )

111.0 × 62.5 × 9.5 (4.37 × 2.46 × 0.37)

83.0 × 33.0 × 8.5 (3.27 × 1.30 × 0.33)

Genuine NISSAN Super Heavy Duty Brake Fluid, or

equivalent DOT 3 (US FMVSS No. 116)

QUICK REFERENCE CHART: MAXIMA

Disc Brake - Repair Limits

Brake model CLZ25VE (Front) AD9A (Rear)
Pad wear limit Minimum thickness 2.0 (0.079) 2.0 (0.079)

Maximum runout 0.07 (0.0028) 0.05 (0.0020)

Rotor repair limit

Brake Pedal

Minimum thickness 26.0 (1.02 ) 8.0 (0.31)
Maximum uneven wear (mea-

sured at 8 positions)

0.015 (0.0006) or less

2007

Unit: mm (in)

Unit: mm (in)

WFIA0423E

Free height “H”*

Pedal height (with engine running, brake pedal force 490 N
{50 kg-f, 110 lb-f) “H”

Clearance “I1” or “I2” between pedal stopper and threaded end of stop lamp switch or
ASCD switch

Pedal play 3 - 11 (0.12 - 0.43)

*: Measured from surface of dash reinforce me nt panel to surface of pedal pad
A: Input rod
B: Floor carpet
C: Dash Insulator
D: Floor Panel
E: Dash reinforcement panel
F: Dash insulator
G: Floor carpet
I1, I2: Gap
J: Stop lamp switch and ASCD switch

M/T 164.1 - 174.1 (6.46 - 6.85)
A/T 173.1 - 183.1 (6.81 - 7.21)
M/T More than 84 (3.31)
A/T More than 90.3 (3.55)

0.74 - 1.96 (0.0291 - 0.0772)

QUICK REFERENCE CHART: MAXIMA

2007

Refill Capacities ELS001PY

Description

Fuel 75.6 20 gal 16 5/8 gal
Engine oil

Drain and refill
Dry engine (engine overhaul) 4.6 4 7/8 qt 4 qt

Cooling system With reservoir at MAX level 8.5 2 1/4 gal 1 7/8 gal
CVT fluid 10 10 5/8 qt 8 3/4 qt
Power steering fluid (PSF) 1.0 2 1/8 pt 1 3/4 pt
Air conditioning system refrigerant 0.55 ± 0.025 kg 1.21 ± 0.055 lb 1.21 ± 0.055 lb
Air conditioning system lubricant

With oil filter change 4.2 4 1/2 qt 3 3/4 qt
Without oil filter change 4.0 4 1/4 qt 3 1/2 qt

Liter US measure Imp measure

150 m

Capacity (approximate)

5.03 fl oz 5.3 fl oz

B ENGINE

A

ACC

SECTION

ACCELERATOR CONTROL SYSTEM

CONTENTS

PRECAUTIONS .......................................................... 2

Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-

SIONER” .................................................................. 2

ACCELERATOR CONTROL SYSTEM .......................3

Removal and Installation .......................................... 3

REMOVAL ............................................................. 3

INSTALLATION .....................................................3

SERVICE DATA AND SPECIFICATIONS (SDS) ........ 4

Accelerator Control ................................................... 4

PEDAL TRAVEL .................................................... 4

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Revision: May 2006 2007 Maxima

ACC-1

PRECAUTIONS

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

BELT PRE-TENSIONER”

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front sea t belt , helps t o redu ce th e r isk or s everi ty of injury to th e driv er an d front passenge r for c ertain
types of collisi on . Thi s s ys te m in cludes seat belt switch inputs and dual stage front air bag mod ul es . The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information ne ce ss ary t o se rvi ce th e sy stem saf e ly is i nclu de d in th e SR S and SB se ct i on of th is Ser vic e Man­ual.

WARNING:

● To avoid rendering the SRS inoperativ e, which cou ld increase the risk of persona l 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, in cluding incorrect removal a nd installation of the SRS, can lead to per-

sonal injury caused by unintentional activation of th e sy ste m. For rem ova l of Spiral Cable and Air
Bag Module, see the SRS section.

● Do not use electrical test equipme nt on any circuit related to the SRS unle ss instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors .

EBS00RBM

Revision: May 2006

ACC-2

2007 Maxima

ACCELERATOR CONTROL SYSTEM

ACCELERATOR CONTROL SYSTEM PFP:18005

Removal and Installation EBS00JTF

REMOVAL

1. Disconnect the negative battery cable.

2. Disconnect the accelerator position sensor electrical connector.
a. Pull the connector lock back to unlock the connector from the

accelerator pedal position s ensor as shown.

b. Pull up on the connector to disconnect it from the accelerator

pedal position sensor as shown.

LBIA0333E

A

ACC

C

D

E

3. Remove the upper accelerator pedal nuts and lower accelerator
pedal bolt.

4. Remove the accelerator pedal and accelerator position sensor
assembly.

● For electrical inspection of the accelerator pedal position sen-

sor, refer to EC-570, "

ACCELERATOR PEDAL POSITION

SENSOR" .

CAUTION:

● Do not disassemble the pe dal assembly. Do not remove

the accelerator pedal position sensor from the pedal
assembly.

● Avoid impact from dropping during handling.

● Keep the pedal assemb ly away from water.

INSTALLATION

1. Installation is in the reverse order of removal.

● Check the accelerato r pedal for sm ooth opera tion. Ther e should be no bindin g or stickin g when appl y-

ing or releasing the accelera tor pe da l.

● Check that the accelerator pedal moves through the full spec-

ified distance of pedal travel.

Pedal travel A : 52.6 - 58.2 mm (2.07 - 2.29 in)

CAUTION:

When the harness connector of the accelerator pedal posi­tion sensor is disconnected, perform the "Accelerator pedal
released position learning". Refer to EC-79, "

Pedal Released Position Learning" .

Accelerator

LBIA0334E

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LBIA0062E

Revision: May 2006 2007 Maxima

ACC-3

SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS) PFP:0003 0
Accelerator Control EBS00JTG

PEDAL TRAVEL

Accelerator control pedal - total travel 52.6 - 58.2 mm (2.07 - 2.29 in)

Revision: May 2006

ACC-4

2007 Maxima

K ELECTRICAL

A

B

SECTION

AUTO CRUISE CONTROL SYSTEM

CONTENTS

AUTOMA TIC SPEED CONTROL DEVICE (ASCD) ..... 2

Description ............................................................... 2

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Revision: May 2006 2007 Maxima

ACS-1

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

AUTOMATIC SPEED CONTROL DEVICE (ASCD) PFP:18930
Description EKS009HW

Regarding the information for ASCD system, refer to EC-29, "AUTOMATIC SPEED CONTROL DEVICE

(ASCD)" .

Revision: May 2006 2007 Maxima

ACS-2

J AIR CONDITIONER

A

B

SECTION

AUTOMATIC AIR CONDITIONER

CONTENTS

PRECAUTIONS .......................................................... 4

Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-

SIONER” .................................................................. 4

Precautions for Working with HFC-134a (R-134a) ..... 4

Contaminated Refrigerant ........................................ 4

General Refrigerant Precautions .............................. 5

Precautions for Leak Detection Dye ......................... 5

A/C Identification Label ............................................ 5

Precautions for Refrigerant Connection ................... 6

FEATURES OF NEW TYPE REFRIGERANT

CONNECTION ................................ ...................... 6

O-RING AND REFRIGERANT CONNECTION ..... 7

Precautions for Servicing Compressor ..................... 9

Precautions for Service Equipment .......................... 9

RECOVERY/RECYCLING EQUIPMENT .............. 9

ELECTRONIC LEAK DETECTOR ........................ 9

VACUUM PUMP ................................................. 10

MANIFOLD GAUGE SET .................................... 10

SERVICE HOSES ............................................... 10

SERVICE COUPLERS .........................................11

REFRIGERANT WEIGHT SCALE .......................11

CHARGING CYLINDER .......................................11

PREPARATIO N ................. .................... .................... 12

Special Service Tools ............................................. 12

HFC-134a (R-134a) Service Tools and Equipment ... 12

Commercial Service Tools ...................................... 14

REFRIGERATION SYSTEM .............................. ....... 16

Refrigerant Cycle ................................................... 16

REFRIGERANT FLOW ....................................... 16

Refrigerant System Protection ............................... 16

REFRIGERANT PRESSURE SENSOR ............. 16

PRESSURE RELIEF VALVE .............................. 16

Component Layout ................................................. 17

OIL ............................................................................ 18

Maintenance of Oil Quantity in Compressor .......... 18

OIL ...................................................................... 18

CHECKING AND ADJUSTING ........................... 18

AIR CONDITIONER CONTROL ............................... 21

Description of Air Conditioner LAN Control System ... 21

System Construction .............................................. 21

OPERATION ........................................................21

TRANSMISSION DATA AND TRANSMISSION

ORDER ............................................................... 22

AIR MIX DOOR CONTROL (AUTOMATIC TEM-

PERATURE CONTROL) ..................................... 23

FAN SPEED CONTROL ...................................... 23

INTAKE DOOR CONTROL .................................23

OUTLET DOOR CONTROL ................................23

MAGNET CLUTCH CONTROL ...........................23

SELF-DIAGNOSTIC SYSTEM ............................ 23

Description of Control System ................................ 24

Control Operation ................................................... 25

DISPLAY SCREEN ..............................................25

AUTO SWITCH ...................................................25

TEMPERATURE CONTROL DIAL (DRIVER

SIDE) .............................. ..................................... 25

TEMPERATURE CONTROL DIAL (PASSEN-

GER SIDE) ...................................................... .... 25

RECIRCULATION () SWITCH .............................25

DEFROSTER (DEF) SWITCH .............................25

REAR WINDOW DEFOGGER SWITCH ............. 25

OFF SWITCH ......................................................25

A/C SWITCH .......................................................25

MODE SWITCH .................................................. 25

BLOWER CONTROL SWITCH ........................... 26

DUAL SWITCH (WITH LEFT AND RIGHT VEN-

TILATION TEMPERATURE SEPARATE CON-

TROL SYSTEM) .................................................. 26

Fail-safe Function ................................................... 26

Discharge Air Flow ................................................. 27

............................................................................27

System Description .................................................28

SWITCHES AND THEIR CONTROL FUNCTION ...28

CAN Communication System Description ..............29

TROUBLE DIAGNOSIS ............................................ 30

CONSULT-II Function (BCM) ................ ...... ....... ....30

CONSULT-II START PROCEDURE ....................30

DATA MONITOR .................................................30

How to Perform Trouble Diagnosis for Quick and

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Revision: May 2006 2007 Maxima

ATC-1

Accurate Repair ...................................................... 31

WORK FLOW ......................................................31

SYMPTOM TABLE ..............................................31

Component Parts and Harness Connector Location ...33

ENGINE COMPARTMENT .................................. 33

PASSENGER COMPARTMENT ..........................34

Schematic ................. ..............................................35

Wiring Diagram — A/C,A — ...................................36

Unified Meter and A/C Amp. Terminals and Refer-

ence Value ..............................................................41

A/C System Self-diagnosis Function ......................41

DESCRIPTION ....................................................41

FUNCTION CONFIRMATION PROCEDURE ......41

AUXILIARY MECHANISM: TEMPERATURE

SETTING TRIMMER ...........................................46

AUXILIARY MECH ANISM: DEFROST/FOOT

POSITION SETTING TRIMMER .........................48

AUXILIARY MECHANISM: INLET PORT MEM-

ORY FUNCTION .................................................48

Operational Check .................................................. 49

CHECKING MEMORY FUNCTION .....................49

CHECKING BLOWER .........................................49

CHECKING DISCHARGE AIR ............................49

CHECKING RECIRCULATION ............................49

CHECKING TEMPERATURE DECREASE ......... 49

CHECKING TEMPERATURE INCREASE ..........49

CHECKING TEMPERATURE DECREASE ......... 50

CHECKING TEMPERATURE INCREASE ..........50

CHECK A/C SWITCH .......................................... 50

CHECK NAVI DISPLAY OR A/C DISPLAY ..........50

CHECKING AUTO MODE ...................................50

Power Supply and Ground Circuit for Front Air Con-

trol and Unified Meter and A/C Amp. ......................51

INSPECTION FLOW ...........................................51

COMPONENT DESCRIPTION ............................52

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ...52

LAN System Circuit ................................................ 55

DIAGNOSTIC PROCEDURE FOR LAN CIR-

CUIT .................................................................... 55

Mode Door Motor Circuit ........................................ 57

INSPECTION FLOW ...........................................57

SYSTEM DESCRIPTION ....................................59

COMPONENT DESCRIPTION ............................60

DIAGNOSTIC PROCEDURE FOR MODE

DOOR MOTOR ...................................................60

Air Mix Door Motor Circuit ......................................61

INSPECTION FLOW ...........................................61

SYSTEM DESCRIPTION ....................................63

COMPONENT DESCRIPTION ............................64

DIAGNOSTIC PROCEDURE FOR AIR MIX

DOOR MOTOR ...................................................64

Air Mix Door Motor PBR Circuit ..............................64

DIAGNOSTIC PROCEDURE FOR AIR MIX

DOOR MOTOR PBR CIRCUIT ............................64

Intake Door Motor Circuit ........................................65

INSPECTION FLOW ...........................................65

SYSTEM DESCRIPTION ....................................67

COMPONENT DESCRIPTION ............................68

DIAGNOSTIC PROCEDURE FOR INTAKE

DOOR MOTOR ....................................................68

Blower Motor Circuit ................................................69

INSPECTION FLOW ....... ....... ...... ....... ...... ...........69

SYSTEM DESCRIPTION .....................................71

COMPONENT DESCRIPTION ............................72

DIAGNOSTIC PROCEDURE FOR BLOWER

MOTOR .................................. ............. ............. ....72

COMPONENT INSPECTION ...............................75

Magnet Clutch Circuit ..............................................76

INSPECTION FLOW ....... ....... ...... ....... ...... ...........76

SYSTEM DESCRIPTION .....................................78

DIAGNOSTIC PROCEDURE FOR MAGNET

CLUTCH ..............................................................78

Insufficient Cooling ..................................................83

INSPECTION FLOW ....... ....... ...... ....... ...... ...........83

PERFORMANCE TEST DIAGNOSES ................85

PERFORMANCE CHART ....................................87

TROUBLE DIAGNOSES FOR UNUSUAL PRES-

SURE .............................. .....................................88

Insufficient Heating .................................................91

INSPECTION FLOW ....... ....... ...... ....... ...... ...........91

Noise ............................ ...........................................93

INSPECTION FLOW ....... ....... ...... ....... ...... ...........93

Self-diagnosis .........................................................94

INSPECTION FLOW ....... ....... ...... ....... ...... ...........94

Memory Function ....................................................96

INSPECTION FLOW ....... ....... ...... ....... ...... ...........96

Ambient Sensor Circuit ...........................................97

COMPONENT DESCRIPTION ............................97

AMBIENT TEMPERATURE INPUT PROCESS ...97
DIAGNOSTIC PROCEDURE FOR AMBIENT

SENSOR ......................... .....................................97

COMPONENT INSPECTION ...............................99

In-vehicle Sensor Circuit .......................................100

COMPONENT DESCRIPTION ..........................100

DIAGNOSTIC PROCEDURE FOR IN-VEHICLE

SENSOR ......................... ...................................101

COMPONENT INSPECTION .............................102

Sunload Sensor Circuit .........................................103

COMPONENT DESCRIPTION ..........................103

SUNLOAD INPUT PROCESS ...........................103

DIAGNOSTIC PROCEDURE FOR SUNLOAD

SENSOR ......................... ...................................103

COMPONENT INSPECTION .............................105

Intake Sensor Circuit .............................................106

COMPONENT DESCRIPTION ..........................106

DIAGNOSTIC PROCEDURE FOR INTAKE SEN-

SOR ...................................................................106

COMPONENT INSPECTION .............................107

Multiplex Communication Circuit ...........................108

DIAGNOSIS PROCEDURE FOR MULTIPLEX

COMMUNICATION ............................................108

A/C Display (without NAVI) ...................................110

DIAGNOSIS PROCEDURE FOR A/C DISPLA Y .110

Front Air Control Self - Diagnosis .........................112

DIAGNOSIS PROCEDURE FOR FRONT AIR

CONTROL .........................................................112

Revision: May 2006 2007 Maxima

ATC-2

UNIFIED METER AND A/C AMP. ............................113

Removal and Installation .......................................113

REMOVAL ..........................................................113

INSTALLATION ..................................................113

AMBIENT SENSOR .............................. ...... ....... ......114

Removal and Installation .......................................114

REMOVAL ..........................................................114

INSTALLATION ..................................................114

IN-VEHICLE SENSOR .............................................115

Removal and Installation .......................................115

REMOVAL ..........................................................115

INSTALLATION ..................................................115

SUNLOAD SENSOR ...............................................116

Removal and Installation .......................................116

REMOVAL ..........................................................116

INSTALLATION ..................................................116

INTAKE SENSOR ....................................................117

Removal and Installation .......................................117

REMOVAL ..........................................................117

INSTALLATION ..................................................117

BLOWER UNIT ........................................................118

Removal and Installation .......................................118

REMOVAL ..........................................................118

INSTALLATION ..................................................118

BLOWER MOTOR ...................................................119

Removal and Installation .......................................119

REMOVAL ..........................................................119

INSTALLATION ..................................................119

INTAKE DOOR MOTOR ......................................... 120

Removal and Installation ...................................... 120

REMOVAL ......................................................... 120

INSTALLATION ................................................. 120

IN-CABIN MICROFILTER ....................................... 121

Removal and Installation ...................................... 121

FUNCTION ...................................... ............. ..... 121

REPLACEMENT TIMING .................................. 121

REPLACEMENT PROCEDURES ..................... 121

HEATER & COOLING UNIT ASSEMBLY .............. 122

Removal and Installation ...................................... 122

REMOVAL ......................................................... 122

INSTALLATION ................................................. 122

HEATER CORE ................................................. ..... 123

Removal and Installation ...................................... 123

REMOVAL ......................................................... 123

INSTALLATION ................................................. 123

MODE DOOR MOTOR ........................................... 124

Removal and Installation ...................................... 124

REMOVAL ......................................................... 124

INSTALLATION ................................................. 124

AIR MIX DOOR MOTOR ......................................... 125

Removal and Installation ...................................... 125

DRIVER SIDE AIR MIX DOOR MOTOR ........... 125

PASSENGER SIDE AIR MIX DOOR MOTOR .. 125

FAN CONTROL AMPLIFIER .................................. 126

Removal and Installation ...................................... 126

REMOVAL ......................................................... 126

INSTALLATION ................................................. 126

DUCTS AND GRILLES ...........................................127

Removal and Installation ......................................127

CENTER VENTILATOR GRILLE . ....... ...... ....... ..127

SIDE VENTILATOR GRILLE LH .......................127

SIDE VENTILATOR GRILLE RH .......................128

FLOOR DUCT ...................................................128

REFRIGERANT LINES ...........................................130

HFC-134a (R-134a) Service Procedure ...............130

SETTING OF SERVICE TOOLS AND EQUIP-

MENT ................................................................130

Components .........................................................132

Removal and Installation for Compressor ............133

REMOVAL .........................................................133

INSTALLATION .................................................133

Removal and Installation for Compressor Clutch .133

REMOVAL .........................................................133

INSPECTION AFTER REMOVAL .....................134

INSTALLATION .................................................135

INSPECTION AFTER INSTALLATION ..............136

BREAK-IN OPERATION ....................................136

Removal and Installation for Low-pressure Flexible

Hose .....................................................................136

REMOVAL .........................................................136

INSTALLATION .................................................136

Removal and Installation for High-pressure Flexible

Hose .....................................................................136

REMOVAL .........................................................136

INSTALLATION .................................................137

Removal and Installation for High-pressure Pipe .137

REMOVAL .........................................................137

INSTALLATION .................................................137

Removal and Installation for Refrigerant Pressure

Sensor ..................................................................137

REMOVAL .........................................................137

INSTALLATION .................................................137

Removal and Installation for Condenser ..............137

REMOVAL .........................................................137

INSTALLATION .................................................138

Removal and Installation for Evaporator ..............138

REMOVAL .........................................................138

INSTALLATION .................................................139

Removal and Installation for Expansion Valve ......139

REMOVAL .........................................................139

INSTALLATION .................................................140

Checking for Refrigerant Leaks ............................140

Checking System for Leaks Using the Fluorescent

Leak Detector .......................................................140

Dye Injection .........................................................141

Electronic Refrigerant Leak Detector ....................141

PRECAUTIONS FOR HANDLING LEAK

DETECTOR ........................... ............................141

CHECKING PROCEDURE ...............................142

SERVICE DATA AND SPECIFICATIONS (SDS) ....144

Service Data and Specifications (SDS) ................144

COMPRESSOR ................................................144

LUBRICANT ......................................................144

REFRIGERANT ..................... ............................144

ENGINE IDLING SPEED ..................................144

BELT TENSION .................................................144

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ATC-3

PRECAUTIONS

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

BELT PRE-TENSIONER”

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front sea t belt , helps t o redu ce th e r isk or s everi ty of injury to th e driv er an d front passenge r for c ertain
types of collisi on . Thi s s ys te m in cludes seat belt switch inputs and dual stage front air bag mod ul es . The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information ne ce ss ary t o se rvi ce th e sy stem saf e ly is i nclu de d in th e SR S and SB se ct i on of th is Ser vic e Man­ual.

WARNING:

● To avoid rendering the SRS inoperativ e, which cou ld increase the risk of persona l 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, in cluding incorrect removal a nd installation of the SRS, can lead to per-

sonal injury caused by unintentional activation of th e sy ste m. For rem ova l of Spiral Cable and Air
Bag Module, see the SRS section.

● Do not use electrical test equipme nt on any circuit related to the SRS unle ss instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors .

EJS002TV

Precautions for Working with HFC-134a (R-134a) EJS002TW

WARNING:

● CFC-12 (R-12) refrigeran t and HFC -134a (R -134a) refrige rant are not com patible. If the re friger ants

are mixed compressor failure is likely to occur. Refer ATC-4, "
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use refrigerant recov­ery/recycling equipmen t and refrigerant identifier.

● Use only specified oil for the HF C-134a (R-134a ) A/C system a nd HFC-134a (R-134a) c omponents.

If oil other than that specified is used, compressor failure is likely to occur.

● The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following

handling precautions must be observed:

– When removing refrigerant com ponents from a vehicle, immediately cap (seal) the component to

minimize the entry of moisture from the atmosphere.

– When installing refrigerant comp onents to a vehicle, do not remove the ca ps (unseal) until jus t

before connecting the comp onents. Connect all refrigerant loop components as quickly as possi­ble to minimize the entry of moisture into system.

– Only use the specifie d oil from a sealed container. Immediately reseal con tainers of oil. Without

proper sealing, oil will become moisture saturated and should not be used.

– Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.

Remove R-134a from the A/C system using certified service equipment meeting requirements of
SAE J2210 (R-1 34 a re cy cl i ng eq u ipme n t) , or SAE J220 9 ( R- 13 4a reco ve ry e qu ipm en t) . If ac ci den tal
system discharge occurs, ventilate work area before resuming service. Additional health and
safety information may be obtained from refrigerant and oil manufacturers.

– Do not allow refrigerant oil to come in contact with styrofoam parts. Damage may result.

Contaminated Refrigerant" . To

Contaminated Ref rigerant EJS002TX

If a refrigerant other tha n 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 recove ry of the contamin ated refri gerant co uld dam age your s ervice equ ipment a nd refriger -

ant supply.

● Suggest the customer return the ve hicle to the location of previous service where the contami nation ma y

have occurred.

● If you choose to perform the repair, recover the refrigerant using only dedicated equipment and contain-

ers. Do not reco ver contaminated refri gerant into your ex isting service eq uipment. If you r facility

does not have de dicat ed re cover y equi pmen t, you ma y cont ac t a loc al ref rig erant produ ct ret ai ler f or avai l-

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ATC-4

PRECAUTIONS

able service. This refrigerant must be disposed of in accordance with all federal and local regulations. In
addition, replacement of all refrigerant system components on the vehicle is recommended.

● If the vehicle is within the warranty period, the air con ditioner warranty is void. Pleas e contact NISSAN

Customer Affairs for furthe r assis tance .

General Refrigerant Precauti on s EJS002TY

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 a nd hand protection (goggles and glove s) 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 r e frige r an t c ontainer with an open flame; i f co ntainer wa r mi ng i s re qu ir ed , pl ac e the

bottom of the container in a warm pail of water.

● Do not intentionally drop, puncture, or incinerate refrigerant containers.

● Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.

● Refrigerant will displace 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 condi-

tioning systems with compressed air during re pair. Some mixtures of air and HF C-134a (R-134a)
have been show n to be combusti ble at elevated pressu res. The se mixtu res, i f ignited, may ca use
injury or property damage. Additional health and safety information may be obtained from refriger­ant manufacturers.

Precautions for Leak Detection Dye EJS002TZ

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D

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F

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H

● The A/C system cont a ins a fluor esce nt le ak de tecti on dye used f or loc ati ng r efrig erant lea ks. An ul trav iole t

(UV) lamp is required to illuminate the dye when inspecting for leaks.

● Always wear fluorescence enhancing UV safety glasses to protect your eyes and enhance the visibility of

the fluorescent dye.

● The fluorescen t dy e le ak de te ct o r is no t a re pl a cem en t for a n e le ct ron i c r efr i ge ran t le ak de tec to r. The fluo-

rescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector (J-

41995).

● For your safety and the cus tomer's sa tisfaction , read and f ollow all m anufacturer' s operating instruction s

and precautions prior to performing work.

● A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal

should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).

● Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a

future service.

● Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled,

clean immedia tely w ith the ap prov ed dy e clea ner. Fl uoresc ent dye l eft on a sur face for an ex tende d per iod
of time cannot be removed .

● Do not spray the fluorescent dye c leaning agent on hot surfaces (engine exhaust manifold, etc.).

● Do not use more than one bottle of refrigerant dye, 40 m (1/4 ounce), per A/C system.

● Leak detect ion dyes for R-1 34a and R-12 A/C systems are differen t. Do not use R-1 34a leak detec tion

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.

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A/C Identification Label EJS002U0

V ehicles with factory installed fluorescent dye have this ide ntification label on the unders ide of hood.

NOTE:

Vehicles with factory installed fluoresc ent dye have a green label.

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ATC-5

PRECAUTIONS

Precautions for Refrigerant Connection EJS002U1

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 reloca ted. It ha s als o been provid ed with a g roo ve for pro per ins tallatio n. This elimi -

nates the chance of the O-ring bei ng caught in, or da maged by, the mating part. The sealing dire ction of
the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing
characteristics.

● The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facil-

itating piping connec tio ns .

SHA815E

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ATC-6

PRECAUTIONS

O-RING AND REFRIGERANT CONNECTION

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WJIA0982E

CAUTION:

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

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ATC-7

PRECAUTIONS

O-Ring Part Numbers and Specifications

Connec­tion type

New 8 92471 N8210 6.8 (0.268) 1.85 (0.0728)

Former 10 J2476 89956 9.25 (0.3642) 1.78 (0.0701)

New

Former 92475 71L00 11.0 (0.433) 2 .4 (0.0 94)

New

Former 92475 72L00 14.3 (0.563) 2 .3 (0.0 91)

New

SHA814E

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

Former 924 77 N 8200 17.12 (0.6740) 1.78 (0.0701)

New 24 92195 AH300 21.8 (0.858) 2.4 (0.094)

WARNING:

Make sure all refrigera nt is disc ha rg ed into the rec yc ling equi pm ent a nd the pr es su re in the sy ste m is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.

CAUTION:

When replacing or cleaning refrigerant cycle components, observe the following.

● When the compressor is re moved, s tore it in the same pos ition as it i s when moun ted on the c ar.

Failure to do so will cause oil to enter the low pressure chamber.

● When connect ing tubes, always use a torque wrench and a back-up wrench.

● After disconnecting tu bes, immediately plug all op enings to prevent entry of di rt and moisture.

● When installing an air conditioner in the veh icl e, c onne ct the pip es as the final stage of the opera -

tion. Do not remove the seal ca ps of pipes and other compon ents until just before required for
connection.

● Allow components stored in cool areas to warm to working area temperature before removing seal

caps. This prevents condensation from forming inside A/C components.

● Thoroughly remove moisture from the refrigeration system before charging the refrigerant.

● Always replace used O-rings.

● When connecting tube, appl y oil to circle of the O-rings shown in illustration. Be ca reful not to

apply oil to threaded portion.
Oil name: NISSAN A/C System Oil Type S

● 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.

O-ring

size

12

16

19

Part number* D mm (in) W mm (in)

92472 N8210 10.9 (0.429) 2.43 (0.0957)

92473 N8210 13.6 (0.535) 2.43 (0.0957)

92474 N8210 16.5 (0.650) 2.43 (0.0957)

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ATC-8

PRECAUTIONS

● After connecting li ne, conduct leak test and make sure that the re is no leakage from connec tion s.

When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten con­nections of seal seat to the specified torque.

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RHA861F

Precautions for Servicing Compressor EJS002U2

● Plug all openings to prevent moisture and foreign matter from entering.

● When the compressor is removed, store it in the same position as it is when mounted on the car.

● When replacing or repairing compressor, follow “Maintenance of Oil Quantity in Compressor”

exactly. Refer to ATC-18, "

● Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with oil,

Maintenance of Oil Quantity in Compressor" .

wipe it off by using a clean waste cloth moistened with thinner .

● After compressor service operation, turn the compressor shaft by hand more than 5 turns in both

directions. This will equally distribute oil inside the compressor. After the compressor is installed,
let the engine idle and operate the compressor for 1 hour.

● After replaci ng the compressor magnet clutch, apply voltage to the new one and check for normal

operation. Refer to ATC-76, "

Magnet Clutch Circuit" .

Precautions for Service Equipment EJS002U3

RECOVERY/ RECYCLING EQUIPMENT

Follow the man uf ac turer's instructio ns for ma c hin e operation and m achine maintenance . N e ve r introduce any
refrigerant other than that specified into the machine.

ELECTRONIC LEAK DETECTOR

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

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ATC-9

PRECAUTIONS

VACUUM PUMP

The oil cont ained inside the vacuum pump is no t compatible with the
specified oil for HFC-134a (R-134a) A/C systems. The vent side of
the vacuum pump is exposed to atmospheric pressure so the vac­uum pump oil may migrate out of the pump into the service hose.
This is possible when the pump is switched off after evacuation (vac­uuming) and hos e is connected to it.
To prevent this migration, use a manual valve situated near the
hose-to-pump connection, as follows.

● Usually vacuum pumps have a manual isolator valve as part of

the pump. Close this valve to isolate the service hose from the
pump.

● For pumps without an isolator, use a hose equipped with a man-

ual shut-off valve near th e pump end. Clo se the valv e to isolate
the hose from the pump.

● If the hose has an automatic shut off valve, disconnect the hose

from the pump: as long as the hose is connected, the valve is
open and lubricating oil may migrate.

Some one-way valves open when vacuum is applied and close
under a no vacuum co ndition. Such valves ma y restrict the pump's
ability to pull a deep vacuum and are not recommended.

MANIFOLD GAUGE SET

Be certain that the gaug e fac e indi cates R-13 4a or 1 34a. Mak e su re
the gauge set has 1/2″-16 ACME threaded connections for service
hoses. Confirm the set has been used only with refrigerant HFC­134a (R-134a) along with specified oil.

SERVICE HOSES

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

RHA270D

SHA533D

RHA272D

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ATC-10

PRECAUTIONS

SERVICE COUPLERS

Never attempt to conn ect HFC-134a (R-1 34a) service coupl ers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly conn ect to the CFC-12 (R-12) sy stem. However, if an
improper connection is attempted, discharging and contamination
may occur.

Shut-off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close

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RHA273D

REFRIGERANT WEIGHT SCALE

Verify that no refrigerant other than HFC134a (R-134a) and specified
oils have been us ed with the scale. If the scale controls refrigeran t
flow electronically , the hose fitting must be 1/2”-16 ACME.

RHA274D

CHARGING CYLINDER

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

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ATC-11

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PREPARATION PFP:00002
Special Service Tools EJS002U5

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number
(Kent-Moore No.)
Tool name

—
(J-38873-A)
Pulley installer

LHA171

KV99233130
(J-29884)
Pulley puller

LHA172

Description

Installing pulley

Removing pulley

HFC-134a (R-134a) Service Tools and Equipment EJS002U6

Never mix HFC-134a refrigerant and/or its specified oil with CFC-12 (R-12) refrigerant and/or its oil.
Separate and non-interchangeable ser vice equipmen t must be used for handling each type of refrigerant/oil.
Refrigerant containe r fittings, service hose fitti ngs and service equipment fit tings (equipment which handle s
refrigerant and/or oil) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid mixed
use of the refrigerants/ oil.
Adapters that convert one size fitting to another must never be used refrigerant/oil contamination will occur
and compressor failure will r esult.

Tool number
(Kent-Moore No.)
Tool name

HFC-134a (R-134a)
(—)
Refrigerant

S-NT196

—
(—)
NISSAN A/C System Oil Type S

Description

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

● large container 1/2”-16 ACME

Type: Poly alkylene glycol oil (PAG),
type S
Application: HFC-134a (R-134a) vane
rotary compressors (NISSAN only)
Lubricity: 40 m (1.4 US fl oz, 1.4 Imp
fl oz)

S-NT197

KV991J0130
(ACR2005-NI)
ACR5 A/C Service Center

WJIA0293E

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ATC-12

Refrigerant recovery, recycling and re ­charging

PREPARATION

Tool number
(Kent-Moore No.)
Tool name

—
(J-41995)
Electronic refrigerant leak detector

—
(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220)
UV lamp and UV safety goggles
(J-41459)
Refrigerant dye injector
(J-41447)
Quantity 24, 1/4 ounce bottles of
HFC-134a (R-134a) fluorescent
leak detection dye
(J-43872)
Refrigerant dye cleaner

—
(J-42220)
Fluorescent dye leak detector

AHA281A

ZHA200H

Description

Checking for refrigerant leaks
Power supply: DC 12V (battery termi­nal)

Leak detection dye
Power supply: DC 12V (battery termi­nal)

Checking for refrigerant leaks when flu­orescent dye is installed in A/C system.
Includes: UV lamp and UV safety gog­gles
Power supply: DC 12V (battery termi­nal)

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

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

—
(J-43872)
Refrigerant dye cleaner

SHA438F

SHA439F

SHA440F

SHA441F

Application: For HFC-134a (R-134a)
PAG oil
Containe r: 1/4 ounce ( 7.4cc) bot tle
(Includes self-adhesive dye identi fica ­tion labels for affixing to vehicle after
charging system with dye.)

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

For cleaning dye spills.

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ATC-13

PREPARATION

Tool number
(Kent-Moore No.)
Tool name

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

Service hoses:

● (J-39500-72B)

High side hose

● (J-39500-72R)

Low side hose

● (J-39500-72Y)

Utility hose
Service couplers:

● (J-39500-20A)

High side coupler

● (J-39500-24A)

Low side coupler

S-NT201

Description

Identification:

● The gauge face indicates R- 134a.

Fitting size: Thread size

● 1/2”-16 ACME

RJIA0196E

Hose colors:

● Low side hose: Blue with black stripe

● High side hose: Red with black stripe

● Utility hose: Yellow with black stripe

or green with black stripe
Hose fitting to gauge:

● 1/2”-16 ACME

Hose fitting to service hose:

● M14 x 1.5 fitting is optional or perma-

nently attached.

S-NT202

—
(J-39699)
Refrigerant weight scale

S-NT200

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

For measuring of refrigerant
Fitting size - thread size:

● 1/2” - 16 ACME

Capacity:

● Air displacement: 4 CFM

● Micron rating: 20 microns

● Oil capacity: 482 g (17 oz)

Fitting size: Thread size

S-NT203

● 1/2”-16 ACME

Commercial Service Tools EJS002U7

Revision: May 2006 2007 Maxima

ATC-14

PREPARATION

Tool name Description
(J-41810-NI)

Refrigerant identifier equipment (R­134a)

RJIA0197E

Power tool Loosening bolts and nuts

PBIC0190E

(J-44614)
Clutch disc holding tool

For checking refrigerant purity and
system contamination

Clutch disc holding tool

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WHA230

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ATC-15

REFRIGERATION SYSTEM

REFRIGERATION SYSTEM PFP:KA990
Refrigerant Cycle EJS002U8

REFRIGERANT FLOW

The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the evap ora tor, and ba ck to the compr esso r. The refri ger ant ev apor atio n thro ugh the e vapor at or coil is
controlled by an externally equalized expansion valve, located inside the evaporator case.

Refrigerant System Protect ion EJS002U9

REFRIGERANT PRESSURE SENSOR

The refrigerant system is prot ected against excessively high or low pressures by the refrigerant pr essure sen­sor , l oc at ed on t he co nd enser. If the system pressure r is es ab ove o r fa lls be lo w t he sp eci fic at i on s, t he ref r ige r­ant pressure sens or detec ts the pressu re inside the refr igerant li ne and sen ds the vo ltage signa l to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high pressure side

detected by refr ige rant pressur e sen sor is over ab out 2,746 kP a (28 kg /cm
(1.22 kg/cm

2

, 17.4 psi).

PRESSURE RELIEF VALVE

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an abnormal level [more than 3,727 kPa (38 kg/

2

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

cm
the atmosphere.

2

, 398 psi), or below about 120 kPa

WJIA0358E

Revision: May 2006 2007 Maxima

ATC-16

REFRIGERATION SYSTEM

Component Layout EJS002UA

A

B

C

D

E

F

G

H

I

ATC

K

L

M

WJIA0294E

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ATC-17

OIL

OIL PFP:KLG00
Maintenance of Oil Quantity in Compressor EJS002UB

The oil in the compressor circulates through the system with the refrigerant. Add oil to compressor when
replacing any component or after a large refrigerant leakage has occurred. It is important to maintain the spec­ified amount.
If oil quantity is not maintained properly, the following malfunctions may result:

● Lack of oil, may lead to a seized compressor.

● Excessive oil, may cause inadequate coolin g (thermal exchange interference).

OIL

Oil type: NISSAN A/C System Oil Type S

CHECKING AND ADJUSTING

CAUTION:

If excessive oil leakage is noted, do not perform the oil return operation.

Start the engine and set the following conditions:

Test Condition

● Engine speed: Idling to 1,200 rpm

● A/C switch: On

● Blower fan speed: Max. position

● Temperature control: Optional [Set with intake air temperature at 25° to 30° C (77° to 86°F).]

● Intake position: Recirculation ( )

● Perform oil return operation for about ten minutes

Adjust the oil quantity according to the following table.

Oil Adjusting Procedure for Components Replacement Except Compressor

After replacing any of the following major components, add the correct amount of oil to the system.

Amount of Oil to be Added

Oil to be added to system

Part replaced

Evaporator 75 (2.5, 2.6) —
Condenser 75 (2.5, 2.6) —
Liquid tank 5 (0.2, 0.2) Add if compressor is not replaced.

In case of refrigerant leak

*1: If refrigerant leak is small, no additional oil is neede d.

Amount of oil

m (US fl oz, Imp fl o z )

30 (1.0, 1.1) Large leak

— Small lea k *1

Remarks

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ATC-18

OIL

Oil Adjustment Procedure for Compressor Replacement

A

B

C

D

E

F

G

WJIA1716E

1. New compressor 2. Old compressor 3. Recovery/recycling equipment

4. Measuring cup X 5. Measuring cup Y 6. N ew oil
A. D ra in oil from the new com pressor

into clean container

D. Install new oil equal to recorded

amounts in measuring cups X plus Y

B. Record amount of oi l recovered C.

Add an additional 5 m (0.2 US fl oz,

0.2 Imp fl oz) of new oil when replac­ing liquid tank

1. Before connecting the recovery/recycling equipment to vehicle, check the recovery/recycling equipment
gauges. No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines.

2. Connect th e recovery/recyclin g equipment to vehicl e. Confirm refrigerant purity in supply tank usin g the
recovery/recycling equipment and refrigerant identifier. If NG, refer to ATC-4, "

Contaminated Refrigerant" .

3. Confirm refrigerant purity in vehicle A/C system using the recovery/recycling equipment and refrigerant
identifier. If NG, refer to ATC-4, "

Contaminated Refrigerant" .

4. Discharg e refrigerant into the ref rigerant recovery/recyc ling equipment. Me asure oil discharged in to the
recovery/recyclin g eq uip m en t.

5. Drain the oi l from the “old” (remove d) compressor into a grad uated container an d recover the amount of
oil drained.

6. Drain the oil from the “new” compressor into a separate, clean container.

7. Measure an amount of new oil ins talled equal to amount dra ined from “old” compressor. Add this oil to
“new” compressor through the suction port op ening.

8. Measure an amount of new oil equal to the amount recovered during discharging. Add this oil to “new”
compressor through the suction port opening.

9. If the liquid tank also needs to be replaced, add an additional 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil at this
time.

H

I

ATC

K

L

M

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ATC-19

OIL

CAUTION:

Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor.

Revision: May 2006 2007 Maxima

ATC-20

AIR CONDITIONER CONTROL

AIR CONDITIONER CONTROL PFP:27500

Description of Air Conditioner LAN Control System EJS002UC

The LAN (Local Area Network) system consists of unified meter and A/C amp., mode door motor, air mi x door
motor and intake door motor.
A configuration of these components is show n in the figure below.

SJIA0262E

System Construction EJS002UD

A small network is constructed between the unified meter an d A/C amp., air mix door motor, mode door motor
and intake door motor. The unifie d mete r and A /C am p. an d moto rs are conn ected by data t ransm iss ion li nes
and motor powe r supply line s. The LAN co mmunicatio n is achieved using the d edicated co mmunication line
and ground line between each door motor and the unified meter and A/C amp.
The unified meter and A/C amp. identifies each motor type by its unique Address. Serial communication
includes positioning and error checking information.
The following f unction s are c ontained in LCU's built i nto the air mix motor, mode door mot or, and intake door
motor.

● Address

● Motor opening angle signals

● Data transmission

● Motor stop and driv e deci si on

● Opening angle sensor [Position balanced resistor (PBR) function]

● Comparison

● Decision (Unified meter and A/C amp. indicated value and motor opening angle comparison)

A

B

C

D

E

F

G

H

I

ATC

K

RJIA1747E

OPERATION

The unified met er and A/C amp. se nds mode door, air mix door an d intake door opening a ngle data to the
mode door motor LCU, air mix door mo tor LC U and intake door motor LCU.
The mode door motor, air mix door moto r and intak e do or m oto r rea d th ei r resp ec ti ve signals according to th e
address signal. Opening angle indication signals are sent from the unified meter and A/C amp. to each of the
motors and are c ompared by the LCUs in each motor with the existing pos ition and op ening angles. Subse­quently , HOT/COLD, DEFROST/VENT or FRESH/RECIRCULA T ION operation is selected. When the selected
angle position is reached a reply is sent from the motors back to the unified meter and A/C amp.

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ATC-21

L

M

AIR CONDITIONER CONTROL

RJIA1748E

TRANSMISSION DATA AND TRANSMISSION ORDER

Unified meter and A/C amp. data is transmitted consecutively to eac h of the door motors foll owing the form
shown in figure below.
Start: Initial compulsory signal sent to each of the door motors.
Address: Data sent from the unified meter and A/C amp. is selected according to data-based decisions made
by the air mix door motor, mode door motor and intake d oor motor.
If the address es are iden tical , the o peni ng an gle d ata and e rror ch eck sig nals are rec eiv ed by the d oor mo tor
LCUs. The LCUs then make the appropriate error decision. If the opening angle data is usual, door control
begins.
If an error exists, the received data is rejected and corrected data received. Finally, door control is based upon
the corrected opening angle data.
Opening angle:
Data that shows the indicate d door opening an gle of each door mo tor.
Error check:
Procedure by wh ic h se nt and r ece iv ed data is checked f or er ror s . Error da t a i s th en com pi led. Th e err o r che ck
prevents corrupted data from being used by the air mix door motor, mode door motor and intake door motor.
Error data can be related to the following symptoms.

● Unusual electrical frequency

● Poor electrical connections

● Signal leak age from transmission lines

● Signal leve l fluctuation

Stop signal:
At the end of each transmission, a stop operation, in-operation, or internal error message is delivered to the
unified meter and A/C amp. This completes one data transmission and control cycle.

RJIA1749E

Revision: May 2006 2007 Maxima

ATC-22

AIR CONDITIONER CONTROL

AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)

The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by: The temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.

A

FAN SPEED CONTROL

Blower speed is automatically controlled based on temperature setting, ambient temperature, in-vehicle tem­perature, intake tempera ture, amount of sunload and air mix door position.
When pressing AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coola nt temper ature is low, the blower moto r operatio n is dela yed to prev ent cool air from flow­ing.

INTAKE DOOR CONTROL

The intake doors are au tomatically controlled by: The temper ature setting, ambient temperatur e, in-vehicle
temperature, intake temp era ture, amount of sunload and ON-O FF op era tio n of the com pres so r.

OUTLET DOOR CONTROL

The outlet door is automatically controlled by: The temperature setting, ambient temperature, in-vehicle tem­perature, intake temperature and amount of sunload.

MAGNET CLUTCH CONTROL

B

C

D

E

F

G

H

I

WJIA2174E

When A/C switch or DEF switch is pressed, unified meter and A/C amp. inputs compressor ON signal to BCM.
BCM sends compressor ON signal to ECM, and unified meter and amp. via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen­sor signal, throttl e angle, etc.). If i t judges compress or can be turned ON, it sends compre ssor ON signal to
IPDM E/R, via CAN communication line.
Upon receipt of comp ressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com­pressor.

SELF-DIAGNOSTIC SYSTEM

The self-diagnostic system is built into the unified meter and A/C amp. to quickly locate the cause of symp­toms.

ATC

K

L

M

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ATC-23

AIR CONDITIONER CONTROL

Description of Control Syste m EJS002UE

The control system consists of input sensors, switches, the unified meter and A/C amp. (microcomputer) and
outputs.
The relation ship of these components is shown in the figur e below:

WJIA2175E

Revision: May 2006 2007 Maxima

ATC-24

AIR CONDITIONER CONTROL

Control Operation EJS002UF

WJIA2176E

DISPLAY SCREEN

Displays the operational status of the system.

A

B

C

D

E

F

G

AUTO SWITCH

● The compress or, intake doors, air m ix doors, ou tlet door s and blo wer speed are automa tically c ontrolled

so that the in-vehicle temperature will reach, and be maintained at the set temperature selected by the
operator.

● When pressing AUTO swi tch, air inlet, air outl et, fan speed, and discharge air temperature are au tomati-

cally controlled.

TEMPERATURE CONTROL DIAL (DRIVER SIDE)

Increases or decreases the set temperature.

TEMPERATURE CONTROL DIAL (PASSENGER SIDE)

● Increases or decreases the set temperature.

● When the temperature dial is turned, the dual switch indicator will automatically illuminate.

RECIRCULATION () SWITCH

● When REC switch is ON, REC switch indicator turns ON, air inlet is set to REC and A/C compressor will

turn ON.

● REC switch is not operated when DEF switch is turn ed ON, or at the D/ F position.

DEFROSTER (DEF) SWITCH

Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position.
The compressor remains ON until the ignition is turned OFF.

REAR WINDOW DEFOGGER SWITCH

When illumination is ON, rear window is defogged.

H

I

ATC

K

L

M

OFF SWITCH

The compressor a nd blower are OFF, the intake doors are set to the outside air position, and t he air outlet
doors are set to the foot (75% foot and 25% defrost) position.

A/C SWITCH

The compressor is ON or OFF.
(Pressing the A/C switch when the AUTO switch is ON will turn off the A/C switch and compressor.)

MODE SWITCH

Controls the air discharge outlets.

Revision: May 2006 2007 Maxima

ATC-25

AIR CONDITIONER CONTROL

BLOWER CONTROL SWITCH

Manually control the blower spee d. Seven speed s are availabl e for manual control (a s shown on the d isplay
screen).

DUAL SWITCH (WITH LEFT AND RIGHT VENTILA TI ON TEMPERATURE SEPARATE CONTROL
SYSTEM)

● When the DUAL swit ch ind icat o r is no t illum in at e d and th e D UA L swi tch is pr e ssed, th e dri ve r -si de sett in g

temperature and passenge r-side setting temperature can each be set independently.

● When DUAL swit ch indicato r is illumi nated and the DUAL sw itch is pr essed, the driver-side setting tem-

perature is applied to both si des.

Fail-safe Function EJS002UG

● If a communication error exists between unified meter and A/C amp. and front air control for 30 seconds

or longer, air co nditioner is controlled under following conditions:

– Compressor: ON
– Air outlet: AUTO
– Air inlet: ( ) Fresh
– Blower fan speed: AUTO
– Set temperature: Setting before communication error occurs.

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ATC-26

AIR CONDITIONER CONTROL

Discharge Air Flow EJS00592

WJIA2191E

A

B

C

D

Mode door position

( ): Manually control

Air outlet/distribution

Vent Foot Defroster

100% 0% —

60% 40% —

— 75% (100%) 25% (—-)
— 60% 40%
— — 100%

E

F

G

H

I

ATC

K

L

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ATC-27

M

AIR CONDITIONER CONTROL

System Description EJS002UI

SWITCHES AND THEIR CONTROL FUNCTION

WJIA1722E

WJIA2181E

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ATC-28

AIR CONDITIONER CONTROL

CAN Communication System Description EJS002UJ

Refer to LAN-4, "SYSTEM DESCRIPTION" .

A

B

C

D

E

F

G

H

I

ATC

K

L

M

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ATC-29

TROUBLE DIAGNOSIS

TROUBLE DIAGNOSIS PFP:00004
CONSULT-II Function (BCM) EJS002UK

CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.

BCM

diagnostic test item

Inspection by part

CONSULT-II START PROCEDURE

Refer to GI-37, "CONSULT-II Start Procedure" .

Diagnostic mode Description

Supports inspections and adjustments. Commands ar e transm i t ted to the

WORK SUPPORT

DATA MONITOR Displays BCM input/output data in real time.

ACTIVE TEST

SELF-DIAG RESULTS Displays BCM self-diagnosis results.

CAN DIAG SUPPORT MNTR

ECU PART NUMBER BCM part number can be read.

CONFIGURATION Per form s BC M co nfigu rati on re ad/ w rite func tions .

BCM for setting the status suitable for required operation, input/output sig­nals are received from the BCM and received date is displayed.

Operation of electrical loads can be checked by sendi ng dr iv e sig nal to
them.

The result of transmit/receive diagnosis of CA N communication can be
read.

DATA MONITOR
Operation Procedure

1. Touch “AIR CONDITIONER” on “SELECT TEST ITEM” screen.

2. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.

WJIA0357E

BCIA0031E

Revision: May 2006 2007 Maxima

ATC-30

TROUBLE DIAGNOSIS

3. Touch ei th er “ ALL SI GNA L S” o r “S ELE CT ION FROM MENU” o n
“DATA MONITOR” screen.

ALL SIGNALS Monitors all the items.
SELECTION FROM

MENU

4. Touch “START”.

5. When “SELECTION FROM MENU” is selected, touch items to
be monitored. When “ALL SIGNALS” is selected, all the items
will be monitored.

6. Touch “RECORD” while mo nitori ng, then the statu s of the moni­tored item can be recorded. T o stop recording, touch “STOP”.

Display Item List

Monitor item name “operation or

unit”
IGN ON SW “ON/OFF” Displays “IGN Position (ON)/OFF, ACC Position (OFF)” status as judged from ignition switch signal.
FAN ON SIG “ON/OFF” Displays “FAN (ON)/FAN (OFF)” status as judged from blower fan motor switch signal.
AIR COND SW “ON/OFF” Displays “AIR COND (ON)/AIR COND (OF F)” status as judged f rom ai r cond itioner sw itch signal.

Selects and monitors the individual item selected.

SJIA0270E

Contents

A

B

C

D

E

F

How to Perform Trouble Diagnosis for Quick and Accurate Repair EJS002UL

WORK FLOW

SHA900E

*1 ATC-49, "Operational Check"

SYMPTOM TABLE

Symptom Reference Page

A/C system is completely inoperative. Go to Trouble Diagnosis Procedure for A/C System.

A/C system is partially inoperative. Go to Diagnostic Procedure for Front Air Control.

A/C display inoperative. Go to Diagnostic Procedure for A/C Display.

Air outlet does not change.
Mode door motor does not operate normally.

Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN)

ATC-51, "

Ground Circuit for

Front Air Control

and Unified Meter

and A/C Amp."

ATC-112, "

Air Control Self -

Board Self-Diag-

nosis Function"

(with NAVI) ATC-

110, "A/C Display

(without NAVI)"
ATC-57, "Mode

Door Motor Cir-

Power

Supply and

Front

Diagnosis"

AV-151, "

On

cuit"

G

H

I

ATC

K

L

M

Revision: May 2006 2007 Maxima

ATC-31

TROUBLE DIAGNOSIS

Symptom Reference Page
Discharge air temperature does not change.
Air mix door motor does not operate nor-

mally.
Intake door does not change.

Intake door motor does not operate normally.
Blower motor operation is malfunctioning.

Blower motor operation is malfunctioning
under out of starting fan speed control.

Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch.

Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling.

Insufficient heating Go to Trouble Diagnosis Procedure for Insu fficient Heati ng.

Noise Go to Trouble Diagnosis Procedure for Noise. ATC- 93, "Noise"

Self-diagnosis cannot be performed. Go to Trouble Diagnosis Procedure for Self-diagnosis.

Memory function does not operate. Go to Trouble Diagnosis Procedure for Memor y Func tion.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor. (LAN)

Go to Trouble Diagnosis Procedure for Intake Door Motor. (LAN)

Go to Trouble Diagnosis Procedure for Blower Motor.

ATC-61 , "Air Mix

Door Motor Cir-

cuit"

ATC-65 , "
Door Motor Cir-

ATC-69 , "

Motor Circuit"

ATC-76 , "

Clutch Circuit"

ATC-83, "

cient Cooling"

ATC-91, "

cient Heating"

ATC-94, "

ATC-96, "

Intake

cuit"

Blower

Magnet

Insuffi-

Insuffi-

Self-

diagnosis"

Memory

Function"

Revision: May 2006 2007 Maxima

ATC-32

TROUBLE DIAGNOSIS

Component Parts and Harness Connector Location EJS002UM

ENGINE COMPARTMENT

A

B

C

D

E

F

G

H

I

ATC

K

L

M

WJIA1906E

1. Refrigerant pressure senor E11 2. Radiat or 3. A/C compr essor F3 (view from tire
housing RH)

4. Ambient sensor E1 5. Grille

Revision: May 2006 2007 Maxima

ATC-33

PASSENGER COMPARTMENT

TROUBLE DIAGNOSIS

WJIA2182E

1. Mode door motor M40 2. Air mix door motor (dr iver) M39 3. In-vehicle sensor M32

4. Uni fie d me ter and A/ C amp. M4 9,
M50, M89

7. Evaporator 8. Blower motor M62 9. Fan control amp. M64

10. Sunload sensor M65 11. Intake door motor M58 12. Air mix door motor (passenger)

Revision: May 2006 2007 Maxima

5. Front air control M201 6. Intake sensor M33

M87

ATC-34

TROUBLE DIAGNOSIS

Schematic EJS002UN

A

B

C

D

E

F

G

H

I

ATC

K

L

M

WJWA0441E

Revision: May 2006 2007 Maxima

ATC-35

TROUBLE DIAGNOSIS

Wiring Diagram — A/C,A — EJS002UO

WJWA0442E

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ATC-36

TROUBLE DIAGNOSIS

A

B

C

D

E

F

G

H

I

ATC

K

L

M

WJWA0443E

Revision: May 2006 2007 Maxima

ATC-37

TROUBLE DIAGNOSIS

WJWA0444E

Revision: May 2006 2007 Maxima

ATC-38

TROUBLE DIAGNOSIS

A

B

C

D

E

F

G

H

I

ATC

K

L

M

LJWA0014E

Revision: May 2006 2007 Maxima

ATC-39

TROUBLE DIAGNOSIS

WJWA0445E

Revision: May 2006 2007 Maxima

ATC-40

TROUBLE DIAGNOSIS

Unified Meter and A/C Amp. Terminals and Reference V alue EJS002UP

Refer to DI-30, "Terminals and Reference Value for Unified Meter and A/C Amp." .

A/C System Self-diagnosis Function EJS002UQ

DESCRIPTION

The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli­cable sections (items) for details. To shift from usual control to the self-diagnostic system refer to ATC-41,

"FUNCTION CONFIRMATION PROCEDURE" .

FUNCTION CONFIRMA TION PROCEDURE

A

B

C

1. ENTER SELF-DIAGNOSTIC MODE

CAUTION:

● If battery voltage dro ps below 12V duri ng diagnos is STEP 3, actuator speed b ecomes slo wer and

as a result, the system may generate an error even when operation is usual. To avoid this, start
engine before performing this diagnosis.

NOTE:

Former STEP 1 (LEDs and display screen are checked) no longer exist in this self-diagnosis function.

1. Start engine.

2. Within 10 seconds after starting engine, press OFF switch for at least 5 seconds.

NOTE:

Self-diagnostic mode can be canceled by either pressing AUTO switch, turning the ignition switch OFF, or
pressing the B ACK button if eq uipped with NAVI.

>> GO TO 2.

2. SELF-DIAGNOSIS STEP 2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT

NOTE:

When conducting test indoors, aim a light (more than 60W) at sunload sensor, otherwise Code No. 25 will indi­cate despite that sunload sensor is functioning properly

Does code No. 20 appear on the display 25 seconds after " 2" is illuminated?

YES >> GO TO 3.
NO >> GO TO 13.

D

E

F

G

H

I

ATC

K

3. CHECK OPERATION OF TEMPERATURE CONTROL DIAL

Rotate the temperature control dial (driver) clockwise.

Does the temperature control dial advance to self-diagnosis STEP 3?

YES >> GO TO 4.
NO >> Malfunctioning temperature control dial.

>> Check front air control. Refer to ATC-112, "

Front Air Control Self - Diagnosis" .

4. CHECK TO RETURN SELF-DIAGNOSIS STEP 2

Rotate the temperature control dial (driver) counterclockwise.

Does the temperature contro l dial return to self-diagnosis STEP 2?

YES >> GO TO 5.
NO >> Malfunctioning temperature control dial.

>> Check front air control. Refer to ATC-112, "

Front Air Control Self - Diagnosis" .

5. SELF-DIAGNOSIS STEP 3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED

Rotate the temperature control dial (driver) clockwise to STE P 3.

Revision: May 2006 2007 Maxima

ATC-41

L

M

TROUBLE DIAGNOSIS

Does code No. 30 appear on the display 50 seconds after "3" is illuminated?

YES >> GO TO 6.
NO >> GO TO 14.

6. STEP 4: CHECK OPERATION OF EACH ACTUATOR

1. Rotate the temperature control dial (driver) clockwise to STEP 4.

2. Press (DEF) switch. Code No. "41" is indicated on the display. Continue to press (DEF) switch to
cycle through each actuator test (41 to 46).

>> GO TO 7.

7. CHECK ACTUATORS

Refer to the followin g chart and confirm di scharge air flow, air tem­perature, blower motor voltage and compressor operation.

RJIA1761E

Actuator test code no. 41 42 43 44 45 46
Mode door position VENT B/L 1 B/L 2 D/F1*1 D/F DEF
Intake door position REC REC 20%FRE FRE FRE FRE
Air mix door position FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Blower motor voltage (approx.) 5V 11.75V 8.5V 8.5V 8.5V 11.75V
Compressor ONONOFFOFFONON

Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for
improper operation.
*1: D/F1 automatica ll y con tro ls th e m od e d oo r po s iti on . Ref er to th e Di sc ha rge a ir fl ow tabl e ATC-48, "

AUXIL-

IARY MECHANISM: DEFROST/FOOT POSITION SETTING TRIMMER" .

OK or NG

OK >> GO TO 8.
NG >>

● Air outlet does not change.

GO TO ATC-60, "

● Intake door does not change.

GO TO ATC-68, "

● Blower motor operation is malfunctioning.

GO TO ATC-72, "

● Magnet clutc h do es not en ga ge .

GO TO ATC-78, "

● Discharge air temperature does not change.

GO TO ATC-64, "

DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR" .

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR" .

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR" .

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH" .

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR" .

Revision: May 2006 2007 Maxima

ATC-42

TROUBLE DIAGNOSIS

8. SELF-DIAGNOSIS STEP 5: TEMPERATURE OF EACH SENSOR IS CHECKED

1. Rotate the temperature control dial c lockwise (driver) to STEP 5.

2. Code No. 51 appear s on the display.

>> GO TO 9.

9. CHECK AMBIENT SENSOR

Press (DEF) switch one time. Temperature detected by ambient sensor is indicated on the display (°F for
U.S.A. model, °C for Canada and Mexico models).

NOTE:

If temperat ure shown on di splay greatly differs f rom actual temperature, check sensor circuit first, t hen inspect
sensor.

OK or NG

OK >> GO TO 10.
NG >> GO TO ATC-97, "

Ambient Sensor Circuit" .

10. CHECK IN-VEHICLE SENSOR

Press (DEF) switch a second time. Temperature detected by in-vehicle sensor is indicated on the display
(°F for U.S.A. model, °C for Canada and Mexico models).

NOTE:

If temperat ure shown on di splay greatly differs f rom actual temperature, check sensor circuit first, t hen inspect
sensor.

OK or NG

OK >> GO TO 11.
NG >> GO TO ATC-100, "

In-vehicle Sensor Circuit" .

A

B

C

D

E

F

G

H

I

11. CHECK INTAKE SENSOR

Press (DEF) switch a third time. Temperature detected by intake sensor is indicated on the display (°F for
U.S.A. model, °C for Canada and Mexico models).

NOTE:

If temperat ure shown on di splay greatly differs f rom actual temperature, check sensor circuit first, t hen inspect
sensor.

OK or NG

OK >> GO TO 12.
NG >> GO TO ATC-106, "

Intake Sensor Circuit" .

12. CHECK CAN COMMUNICATION ERROR

1. Press (REC) switch.

2. CAN communication error between unified meter and A/C amp.
and DISPLAY UNIT or DISPLAY CONTROL UNIT is detected.

OK or NG

OK >> 1. Turn ignition switch OFF or AUTO switch ON.

2. Inspection End.

NG >> Go to CAN communication. Refer to DI-28, "CAN Com-

munication System Description" .

● Unified meter and A/C amp. - DISPLAY UNIT

● Unified meter and A/C amp. - DISPLAY CONTROL

UNIT

RJIA1762E

ATC

K

L

M

Revision: May 2006 2007 Maxima

ATC-43

TROUBLE DIAGNOSIS

13. CHECK MALFUNCTIONING SENSOR

Refer to the following chart for malfunctioning code No.
(If two or more sensors malfunction, corresponding code Nos. blink respectively twice.)
When conducting indoors, aim a light (more than 60W) at sunload sensor, otherwise Code No. 25 will indicate
despite that sunload sensor is functioning properly.

NOTE:

Code 20 will be displayed if all sensors and PBR(s) are OK.

Code No. Malfunctioning sensor (Including circuits) Reference page

21 / −21 Ambient sensor ATC-97
22 / −22 In-vehicle sen sor ATC-101
24 / −24 Intake sensor ATC-106
25 / −25 Sunload sensor *1 ATC-103
26 / −26 Air mix door motor PBR (Driver)
27 / −27 Air mix door motor PBR (Passenger)

*1: Conduct self-diagnosis STEP-2 under sunshine.

ATC-55

>> Inspection End.

RJIA0493E

Revision: May 2006 2007 Maxima

ATC-44

TROUBLE DIAGNOSIS

14. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH

Mode and/or intake door motor PBR(s) malfunctioning.

NOTE:

Code 30 will be displayed if all doors are OK.

Code No. *1 *2 Mode or intake door position Reference page

31 VENT
32 B/L 1
33 B/L 2
34 FOOT*3
35 D/F
36 DEF
37 FRE
38 20% FRE
39 REC

(If two or more mode or intake doors are out of order, corresponding code numbers blink respectively twice.)
*1: If mode door motor harness connector is disconnected, the following display pattern will appear.
31→32→33→34→35→36→Return to 31
*2: If intake door motor harness connector is disconnected, the following display pattern will appear.
37→38→39→Return to 37
*3: FOOT position during automatic control. Refer to AT C - 4 8 , "

POSITION SETTING TRIMMER" .

Mode door motor ATC-57

Intake door motor ATC-65

AUXILIARY MECHANISM: DEFROST/FOOT

A

B

C

D

E

F

G

H

>> Inspection End.

I

ATC

K

RJIA0494E

L

M

Revision: May 2006 2007 Maxima

ATC-45

TROUBLE DIAGNOSIS

AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER

The trimmer comp en sate s fo r differences in ran ge of ±3°C (±6°F) between temperature setting (displayed dig­itally) and temperature felt by driver.

Operating procedures for th is trimmer are as follows:

● Begin Self-diagnosis STEP 5 mode. Refer to ATC-41, "A/C System Self-diagnosis Funct ion" .

● Press top of blower control switch to set system in auxiliary mode.

● Display initially shows 61 in auxiliary mechanism. It takes approximately 3 seconds to display the temper-

ature trimmer value.

● Rotate temperature control dial clockwise (driver) as desired. Temperature will change at a rate of 0.5°C

(1.0°F) each time the dial is turned.

Revision: May 2006 2007 Maxima

ATC-46

TROUBLE DIAGNOSIS

A

B

C

D

E

F

G

H

I

ATC

K

L

M

WJIA2186E

When battery cable is disconnected or if battery voltages falls below 10V, trimmer operation (setting) is can­celed. Temperature set becomes that of initial condition, i.e. 0°C (0°F).

Revision: May 2006 2007 Maxima

ATC-47

TROUBLE DIAGNOSIS

AUXILIARY MECHANISM: DEFROST/FOOT POSITION SETTING TRIMMER

Air distribution ratio in FOOT mode can be set.
Operating procedures for th is trimmer are as follows:

● Begin Self-diagnosis STEP 5 mode. Refer to ATC-41, "A/C System Self-diagnosis Funct ion" .

● Press top of blower control switch to set system in auxiliary mode.

● Display initially shows 61 in auxiliary mechanism. It takes approximately 3 seconds to display the temper-

ature trimmer value.

● Press the mode switch as desired.

AUXILIARY MECHANISM: INLET PORT MEMORY FUNCTION

When ignition key is turned from OFF to ON, inlet port can be set to AUTO or manual.
Operating procedures for th is trimmer are as follows:

● Begin Self-diagnosis STEP 5 mode. Refer to ATC-41, "A/C System Self-diagnosis Funct ion" .

● Press top of blower control switch to set system in auxiliary mode.

● Display shows 61 in auxiliary mechanism. It takes approximately 3 seconds.

● Press the recirculation (REC) switch as desired.

Switch

REC

LED status of

REC switch

ON Manual REC status is memorize d. (Init ial sett ing) REC SW: ON

OFF Manual FRE status is memorized. REC SW: OFF

Setting status Setting changeover method

RJIA1764E

Revision: May 2006 2007 Maxima

ATC-48

TROUBLE DIAGNOSIS

Operational Check EJS002UR

The purpose of the operational check is to confirm that the system operates properly.

Conditions : Engine running and at usual operating temperature

CHECKING MEMORY FUNCTION

1. Set the temperature to 32°C (90°F).

2. Press the OFF swi tch.

3. Turn ignition switch OFF.

4. Start engine.

5. Press the AUTO switch.

6. Confirm that the set temperature remains at previous temperature.

7. Press the OFF swi tch.

If NG, go to trouble diagnosis procedure fo r ATC-96, "
If OK, continue with next check.

CHECKING BLOWER

1. Press top of blower control switch. Blower should operate on low speed. The fan symbol should have one
blade lit.

2. Press top of blower control switch again, and continue checking blower speed and fan symbol until all
speeds are checked.

3. Leave blower on maximum speed.

If NG, go to trouble diagnosis procedure fo r ATC-69, "
If OK, continue with next check.

Memory Funct ion" .

Blower Motor Circuit" .

A

B

C

D

E

F

G

H

CHECKING DISCHARGE AIR

1. Press MODE switch four times and (DEF) switch.

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at

(FRE) when the (DEF) or (D/F) is selected.

2. Each position indicator should change shape in display.

3. Confirm that discharge air comes out according to the air distribution table. Refer to AT C -27, "

Air Flow" .

If NG, go to trouble diagnosis procedure fo r ATC-57, "
If OK, continue with next check.

Mode Door Motor Circuit" .

Discharge

CHECKING RECIRCULATION

1. Press the OFF swi tch.

2. Press the AUTO switch.

3. Press recirculation (REC) switch one time. Recirculation indicator should illuminate.

4. Listen for intake door position change (blowe r sound should cha nge slightly).

If NG, go to trouble diagnosis procedure fo r ATC-65, "
If OK, continue with next check.

Intake Door Motor Circuit" .

CHECKING TEMPERATURE DECREASE

1. Rotate temperature control dial counterclockwise (driver) until 16 °C (60°F) is displayed.

2. Check for cold air at discharge air outlets.

If NG, go to trouble diagnosis procedure fo r ATC-83, "
If OK, continue with next check.

Insufficient Cooling " .

I

ATC

K

L

M

CHECKING TEMPERATURE INCREASE

1. Rotate temperature control dial clockwis e (driver) until 32°C (90°F) is displayed.

2. Check for hot air at discharge air outlets.

If NG, go to trouble diagnosis procedure fo r ATC-91, "
If OK, continue with next check.

Revision: May 2006 2007 Maxima

Insufficient Heating" .

ATC-49

TROUBLE DIAGNOSIS

CHECKING TEMPERATURE DECREASE

1. Press the DUAL switch (indicator ON).

2. Rotate temperature co ntrol dial counterclockwise (passenger) until 16°C (60°F) is displayed.

3. Check for cold air at passenger discharge air outlets.
If NG, go to trouble diagnosis procedure for ATC-83, "

If OK, continue with next check.

CHECKING TEMPERATURE INCREASE

1. Rotate temperature control dial clockwise (passeng er) until 32°C (90°F) is displayed.

2. Check for hot air at passenger discharge air outlets.
If NG, go to trouble diagnosis procedure for ATC-91, "

If OK, continue with next check.

CHECK A/C SWITCH

1. Press the OFF switch.

2. Press the top of the fan switch. the fan sho uld operate.

3. Press A/C switch.

4. A/C switch indicator will turn ON.

● Confirm that the compressor clutch engages (sound or visual inspection).

If NG, go to trouble diagnosis procedure for ATC-76, "
If OK, continue with next check.

Insufficient Cooling" .

Insufficient Heating" .

Magnet Clutch Circu it" .

CHECK NAVI DISPLAY OR A/C DISPLAY

1. Turn ignition switch ON.

2. Press each switch on the front air control and monitor the HVAC display.

● Confirm that the HVAC display operates correctly for each switch pressed.

If NG , go to trouble diagnosis procedure for NAVI, refer to AV-151, "
C display refer to ATC-110, "

A/C Display (without NAVI)" .

On Board Self-Diagnosi s Func tion" . For A/

If OK, continue with next check.

CHECKING AUTO MODE

1. Press the OFF switch.

2. Press AUTO switch.

3. Display should indicate AUTO.

● Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower

speed will depend on ambient, i n-vehicle, and set temperatures.)

If NG, go to trouble diagnosis proc edure for AT C -51, "

and Unified Meter and A/C Amp." , then if necessary, tro uble diagnosis procedure for ATC-76, "Magnet Clutch
Circuit" .

If all operation al checks are OK (sympto m cannot b e duplicat ed), go to ma lfunction S imulation Tests in ATC-

31, "How to Perform Trouble Diagnosis for Quick and Accurate Repair" and perform tests as outlined to simu-

late driving conditions environment. If symptom appears, refer to, ATC- 31, "
applicable tr ouble diagnosis procedures.

Power Supply and Ground Circuit for Front Air Control

SYMPTOM TABLE" and perform

Revision: May 2006 2007 Maxima

ATC-50

TROUBLE DIAGNOSIS

Power Supply and Ground Circuit for Front Air Control and Unified Meter and A/
C Amp.

SYMPTOM: A/C system does not come on.

EJS002US

A

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE

1. Press A UTO swi t c h.

2. Display shou ld ind icate AU TO. Con firm th at th e compre ssor clutc h en gage s (s ound or visua l ins pect ion).
(Discharge air and fan speed will depend on ambient, in-vehicle and set temperatures.)

Can a symptom be duplicated?

YES >> GO TO 3.
NO >> GO TO 2.

2. PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to ATC-49, "
Can a symptom be duplicated

YES >> Refer to ATC-31, "SYMPTOM TABLE" .
NO >> System OK.

Operational Check" .

3. CHECK FOR SERVICE BULLETINS

Check for any service bull et ins .

OK >> Check power and ground circuits. Refer to ATC-52, "

TEM" .

DIAGNOSTIC PROCEDURE FOR A/C SYS-

B

C

D

E

F

G

H

I

ATC

K

L

M

Revision: May 2006 2007 Maxima

ATC-51

TROUBLE DIAGNOSIS

COMPONENT DESCRIPTION
Unified meter and A/C amp. (Automatic Amplifier)

The unified meter and A/C amp. has a built-in microcompute r which
processes info rmation sent from various sensors needed for air con­ditioner operation. The air mix door motors, mode door motor, intake
door motor, blower motor and compressor are then controlled.
The unified met er and A /C amp. is unit ized w ith cont ro l mecha nism s.
When the various switches and temperature dials are operated from
the front air control, data is input to the unified meter and A/C amp.
from the front air control using the multiplex communication.
Self-diagnostic functions are also built into unified meter and A/C
amp. to provide quick check of malfunctions in the auto air condi­tioner system .

Potentio Temperature Control (PTC)

The PTC is built into th e front air control. It can be se t at an interva l
of 0.5°C (1.0°F) in the 16°C (60°F) to 32°C (90°F) temperature range
by rotating the temperature dial. The set temperature is displayed.

WJIA0301E

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

SYMPTO M: A/C system does not come on.

WJIA2184E

WJIA1171E

WJIA2201E

Revision: May 2006 2007 Maxima

ATC-52

TROUBLE DIAGNOSIS

1. CHECK FRONT AIR CONTROL

Perform front air control self-diagn os is. Refe r to ATC-112, "
OK or NG

OK >> GO TO 4.
NG >> GO TO 2.

Front Air Control Self - Diagnosis" .

2. CHECK POWER SUPPLY CIRCUIT FOR FRONT AIR CONTROL.

1. Turn ignition switch OFF.

2. Disconnect fr ont air control connector.

3. Turn ignition switch ON.

4. Check voltage between unified meter and A/C amp. harness
connector M49 terminal 1 and ground.

Terminals Ignition switch position

(+)

Front air

control

M201 1 Ground Approx. 0V Approx. 0V

Terminal No.

OK or NG

OK >> GO TO 3.
NG >> Check harness for open circuit. Repair harness as necessary.

(-) OFF ACC ON

Battery
voltage

WJIA2203E

A

B

C

D

E

F

G

H

3. CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Check continuity between front air control harness connector
M201 terminal 2 and ground.

2 – Ground : Continuity should exist.

OK or NG

OK >> Replace front air control. Refer to IP-13, "Center Stack

Assembly" .

NG >> Repair harness or connector.

I

ATC

K

L

WJIA2206E

M

Revision: May 2006 2007 Maxima

ATC-53

TROUBLE DIAGNOSIS

4. CHECK POWER SUPPLY CIRCUIT FOR UNIFIED METER AND A/C AMP.

1. Turn ignition sw itch OFF.

2. Disconnect unified meter and A/C amp. connector.

3. Check voltage between unified meter and A/C amp. harness
connector M50 terminals 21, 22 and 35, unified meter and A/C
amp. harness connector M89 terminal 46 and ground.

Terminals Ignition switch position

(+)

Unified

meter and

A/C amp.

connector

M50 21

M50 22 Approx. 0V Approx. 0V

M50 35 Approx. 0V

M89 46 Approx. 0V Approx. 0V

Terminal No.

OK or NG

OK >> GO TO 5.
NG >> Check fuses [Nos. 6, 12 and 19 (10A) and 10 (15A), located in the fuse block (J/B)]. Refer to PG-

77, "FUSE BLOCK-JUNCTION BOX (J/B)" .

● If fuses are OK, check harness for open circuit. Repair or replace as necessary.

● If fuses a re NG, replace fuse an d check ha rness for sh ort circuit. Re pair or replac e as neces-

sary.

(-) OFF ACC ON

Battery

voltage

Ground

Battery
voltage

Battery
voltage

RJIA1984E

Battery
voltage

Battery
voltage

Battery
voltage

Battery
voltage

5. CHECK GROUND CIRCUIT FOR UNIFIED METER AND A/C AMP.

1. Turn ignition sw itch OFF.

2. Check contin uity between unifi ed meter and A/C amp. harness
connector M50 terminals 29, 30 and ground.

29, 30 – Ground : Continuity should exist.

OK or NG

OK >> Check multiplex communication circuit. Refer to ATC-

108, "Multiplex Communication Circuit" .

NG >> Repair harness or connector.

RJIA1376E

Revision: May 2006 2007 Maxima

ATC-54

TROUBLE DIAGNOSIS

LAN System Circuit EJS002UT

SYMPTOM: Mode door motor, intake door motor and/or air mix door motor(s) does not operate normally.

A

B

C

D

E

F

DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT

1. CHECK POWER SUPPLY FOR UNIFIED METER AND A/C AMP. SIDE

1. Turn ignition switch ON.

2. Check voltage between unified meter and A/C amp. harness
connector M89 terminal 54 and ground.

54 – Ground : Battery voltage

OK or NG

OK >> GO TO 2.
NG >> Replace unified meter and A/C amp. Refer to ATC-113,

"UNIFIED METER AND A/C AMP." .

2. CHECK SIGNAL FOR UNIFIED METER AND A/C AMP. SIDE

Confirm A/C LAN signal between unified meter and A/C amp. har­ness connector M89 terminal 43 and ground using an oscilloscope.

Terminals

(+)

Unified meter

and A/C amp.

connector

Terminal No.

(-)

Voltage

RJIA1775E

RJIA1378E

G

H

I

ATC

K

L

M

RJIA1597E

M89 43 Ground

HAK0652D

OK or NG

OK >> GO TO 3.
NG >> Replace unified meter and A/C amp. Refer to ATC-113, "

Revision: May 2006 2007 Maxima

ATC-55

UNIFIED METER AND A/C AMP." .

TROUBLE DIAGNOSIS

3. CHECK POWER SUPPLY FOR INOPERATIVE DOOR MOTOR

Check voltage between inoperative door motor harness connector
terminal 1 and ground.

1 – Ground : Battery voltage

OK or NG

OK >> GO TO 4.
NG >> Repair harness or connector.

4. CHECK SIGNAL SIDE FOR INOPERATIVE DOOR MOTOR

Confirm A/C LAN signal between inoperative door motor harness
connector terminal 3 and ground using an oscil loscope.

Terminals

Door motor

nector
Mode M40 3
Air mix

(Driver)
Air mix

(Passen­ger)

Intake M58 3

OK or NG

OK >> GO TO 5.
NG >> Repair harness or connector.

(+)

Con-

M39 3

M87 3

Terminal

No.

(-)

Ground

Voltage

HAK0652D

WJIA2244E

WJIA2245E

5. CHECK INOPERATIVE DOOR MOTOR GROUND CIRCUIT

1. Turn ignition sw itch OFF.

2. Disconnect inoperative door motor connector.

3. Check continuity between inoperative door motor harness con­nector terminal 2 and ground.

2 – Ground : Continuity should exist.

OK or NG

OK >> ● Replace mode door motor if inoperative. Refer to

ATC-124, "

● Replace intake door motor if inoperative. Refer to

ATC-124, "

● Replace driver side air mix door motor if inoperative. Refer to ATC-125, "DRIVER SIDE AIR

MIX DOOR MOTOR" .

● Replace passen ger side air mix door motor if ino perative. Refer to ATC-125, "PASSENGER

SIDE AIR MIX DOOR MOTOR" .

NG >> Repair harness or connector.

MODE DOOR MOTOR" .

MODE DOOR MOTOR" .

WJIA2246E

Revision: May 2006 2007 Maxima

ATC-56

TROUBLE DIAGNOSIS

Mode Door Motor Circuit EJS002UU

SYMPTOM:

● Air outlet does not change.

● Mode door motor does not operate normally.

INSPECTION FLOW

A

B

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR

1. Start engine.

2. Press mode switch four times and then press the (defrost) switch. Each position indicator should
change shape (on display).

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at

(FRE) when (DEF) or (D/F) is selected.

3. Confirm that discharge air comes out according to the air distribution table. Refer to AT C -27, "

Air Flow" .

Can a symptom be duplicated?

YES >> GO TO 3.
NO >> GO TO 2.

Discharge

2. PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to ATC-49, "
Can a symptom be duplicated?

YES >> Refer to ATC-31, "SYMPTOM TABLE" .
NO >> System OK.

Operational Check" .

3. CHECK FOR SERVICE BULLETINS

Check for any service bull et ins .

C

D

E

F

G

H

I

ATC

>> GO TO 4.

4. PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

Perform front air control self-diagn os is. Refe r to ATC-112, "
OK or NG

OK >> GO TO 5.
NG >> Perform power and ground circuit for front air control. Refer to ATC-51, "

Ground Circuit for Front A ir Control and Unified Meter and A/C Amp." .

Front Air Control Self - Diagnosis" .

5. PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-41, "
OK or NG

OK >> GO TO 6.
NG >> Check appropriate malfunctioning sensor circuit.

FUNCTION CONFIRMATION PROCEDURE" .

6. PERFORM SELF-DIAGNOSIS STEP - 3

Perform self-diagnosis STEP - 3. Refer toATC-41, "
OK or NG

OK >> GO TO 7.
NG >> Perform diagnostic procedure for LAN system circuit. Refer to ATC - 5 5 , "

DURE FOR LAN CIRCUIT" .

FUNCTION CONFIRMATION PROCEDURE" .

Power Supply and

DIAGNOSTIC PROCE-

K

L

M

Revision: May 2006 2007 Maxima

ATC-57

TROUBLE DIAGNOSIS

7. PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4 to check mode door control. Refer to ATC- 41, "

PROCEDURE" .

OK or NG

OK >> GO TO 8.
NG >> Check and repair mode door motor linkage. Refer to ATC-124, "

FUNCTION CONFIRMATION

MODE DOOR MOTOR" .

8. CHECK AMBIENT SENSOR CIRCUIT (CAUSE CANNOT BE CONFIRMED BY SELF-DIAGNOSIS)

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-97, "
OK or NG

OK >> GO TO 9.
NG >> Repair as necessary.

Ambient Sensor Circuit" .

9. CHECK IN-VEHICLE SENSOR CIRCUIT

Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to ATC-100, "
OK or NG

OK >> GO TO 10.
NG >> Repair as necessary.

In-vehicle Sensor Circuit" .

10. CHECK SUNLOAD SENSOR CIRCUIT

Perform diagnostic procedure for the sunload sensor circuit. Refer to ATC-103, "
OK or NG

OK >> GO TO 11.
NG >> Repair as necessary.

Sunload Sensor Circuit" .

11. CHECK INTAKE SENSOR CIRCUIT

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-106, "
OK or NG

OK >> GO TO 12.
NG >> Repair as necessary.

Intake Sensor Circuit" .

12. CHECK AIR MIX DOOR MOTOR PBR CIRCUIT

Perform diagnostic procedure for the air mix door motor circuit. Refer to ATC-61, "
OK or NG

OK >> If the symptom still exists, perform a complete operational check. Refer to ATC -49 , "Operational

Check" . If no other symptom exists replace unified meter and A/C amp. Refer to ATC-113, "UNI-
FIED METER AND A/C AMP." .

NG >> Repair as necessary.

Air Mix Door Motor Circuit" .

Revision: May 2006 2007 Maxima

ATC-58

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION
Component Parts

Mode door control system componen ts are:

● Unified meter and A/C amp.

● Mode door motor (LCU)

● A/C LAN system (PBR built-into mode door motor, intake door motor and air mix door motor)

● In-vehicle sensor

● Ambient sensor

● Sunload sensor

● Intake sensor

System Operation

The unified meter an d A/C amp. receives data from each of the sensors. The unified meter an d A/C amp.
sends air mix door, mode door and intake do or op ening angle data to t he a ir m ix door motor LC U, mode door
motor LCU and intake door motor LCU.
The air mix door motor, mode door moto r and intak e do or m oto r rea d th ei r resp ec ti ve si gnals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor pos ition sensor s are compared by the LCUs in each moto r with the ex isting deci sion and op ening
angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected.
The new selection data is r e turned to the un ified meter an d A/C amp.

A

B

C

D

E

F

G

Mode Door Control Specification

H

I

ATC

K

L

WJIA2217E

M

WJIA0363E

Revision: May 2006 2007 Maxima

ATC-59

TROUBLE DIAGNOSIS

COMPONENT DESCRIPTION
Mode Door Motor

The mode door motor is attached to the heater and cooling unit
assembly. It rotates so that air is discharged from the outlet set by
the unified me ter and A/C amp. M otor rotation is co nveyed to a lin k
which activates the mo de doo r.

DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR

SYMPTO M: Mode door motor does not operate normally.
Perform diagnostic procedure for LAN circuit. Refer to ATC-55, "

CUIT" .

DIAGNOSTIC PROCEDURE FOR LAN CIR-

WJIA0316E

Revision: May 2006 2007 Maxima

ATC-60

TROUBLE DIAGNOSIS

Air Mix Door Motor Circuit EJS002UV

SYMPTOM:

● Discharge air te mperature does not change.

● Air mix door motor does not operate.

INSPECTION FLOW

A

B

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Turn the temperature control dial (driver) clockwise until 32°C (90°F) is displayed.

2. Check for hot air at discharge air outlets.

>> GO TO 2.

2. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1. Turn the temperature control dial (driver) counterclockwise until 16°C (60°F) is displa ye d.

2. Check for cold air at discharge air outlets.

Can a symptom be duplicated?

YES >> GO TO 4.
NO >> GO TO 3.

3. PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to ATC-49, "
Can a symptom be duplicated?

YES >> Refer to ATC-31, "SYMPTOM TABLE" .
NO >> System OK.

Operational Check" .

4. CHECK FOR SERVICE BULLETINS

Check for any service bull et ins .

C

D

E

F

G

H

I

ATC

>> GO TO 5.

5. PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

Perform front air control self-diagn os is. Refe r to ATC-112, "
OK or NG

OK >> GO TO 6.
NG >> Perform power and ground circuit for front air control. Refer to ATC-51, "

Ground Circuit for Front A ir Control and Unified Meter and A/C Amp." .

Front Air Control Self - Diagnosis" .

6. PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-41, "
OK or NG

OK >> GO TO 7.
OK >> Perform appropriate malfunctionin g sensor circuit.

FUNCTION CONFIRMATION PROCEDURE" .

7. PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-41, "
OK and NG

OK >> GO TO 8.
NG >> Check LAN system circuit. Ref er to ATC-55, "

FUNCTION CONFIRMATION PROCEDURE" .

LAN System Circuit" .

Power Supply and

K

L

M

Revision: May 2006 2007 Maxima

ATC-61

TROUBLE DIAGNOSIS

8. CHECK AMBIENT SENSOR CIRCUIT (CAUSE CANNOT BE CONFIRMED BY SELF-DIAGNOSIS)

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-97, "
OK or NG

OK >> GO TO 9.
NG >> Repair as necessary.

Ambient Sensor Circuit" .

9. CHECK IN-VEHICLE SENSOR CIRCUIT

Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to ATC-100, "
OK or NG

OK >> GO TO 10.
NG >> Repair as necessary.

10. CHECK SUNLOAD SENSOR CIRCUIT

Perform diagnostic procedure for the sunload sensor circuit. Refer to ATC-103, "
OK or NG

OK >> GO TO 11.
NG >> Repair as necessary.

11. CHECK INTAKE SENSOR CIRCUIT

Perform diagnostic procedure for the intake sensor circuit. Refer to ATC-106, "
OK or NG

OK >> GO TO 12.
NG >> Repair as necessary.

Intake Sensor Circuit" .

In-vehicle Sensor Circuit" .

Sunload Sensor Circuit" .

12. CHECK AIR MIX DOOR MOTOR PBR CIRCUIT

Perform diagnostic procedure for the air mix door motor circuit. Refer to ATC-61, "
OK or NG

OK >> If the symptom still exists, perform a complete operational check. Refer to ATC -49 , "Operational

Check" and check for other symptoms. Ref er to ATC-31, "SYMPTOM TABLE" . If no other symp-

tom exists, replace unified meter and A/C amp. Refer to ATC - 11 3 , "

AMP." .

NG >> Repair as necessary.

Air Mix Door Motor Circuit" .

UNIFIED METER AND A/C

Revision: May 2006 2007 Maxima

ATC-62

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION
Component Parts

Air mix door control system components are:

● Unified meter and A/C amp.

● Air mix door motor (LCU)

● A/C LAN system (PBR built-into mode door motor, intake door motor and air mix door motor)

● In-vehicle sensor

● Ambient sensor

● Sunload sensor

● Intake sensor

System Operation

The unified meter an d A/C amp. receives data from each of the sensors. The unified meter an d A/C amp.
sends air mix do or, mode door and intake do or mo t or o pe ning an gl e data to the air mix d oo r mot o r LC U, mode
door motor LCU and intake door motor LCU.
The air mix door motor, mode door moto r and intak e do or m oto r rea d th ei r resp ec ti ve si gnals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor pos ition sensor s are compared by the LCUs in each moto r with the ex isting deci sion and op ening
angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected.
The new selection data is r e turned to the un ified meter an d A/C amp.

A

B

C

D

E

F

G

Air Mix Door Control Specification

H

I

ATC

K

L

WJIA2216E

M

RJIA1782E

Revision: May 2006 2007 Maxima

ATC-63

TROUBLE DIAGNOSIS

COMPONENT DESCRIPTION
Air Mix Door Motor

The air mix door motor is attached to the heater and cooling unit
assembly. It rotates so that the air mix door is opened or closed to a
position set by the unified meter and A/C amp. Motor rotatio n is the n
conveyed throu gh a shaft and the air m ix door position is then fed
back to the un ified m eter an d A/C amp . by PB R buil t-in air mi x door
motor.

WJIA0319E

WJIA0320E

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR

Perform diagnostic procedure for LAN circuit. Refer to ATC-55, "DIAGNOSTIC PROCEDURE FOR LAN CIR-

CUIT" .

Air Mix Door Motor PBR Circuit EJS002UW

SYMPTOM:

● Discharge air temperature does not change.

● PBR circuit is open or shorted.

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR PBR CIRCUIT

Perform diagnostic procedure for LAN circuit. Refer to ATC-55, "DIAGNOSTIC PROCEDURE FOR LAN CIR-

CUIT" .

Revision: May 2006 2007 Maxima

ATC-64

TROUBLE DIAGNOSIS

Intake Door Motor Circuit EJS002UX

SYMPTOM:

● Intake door does not change.

● Intake door mo tor does not operate normally.

INSPECTION FLOW

A

B

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC ( )

1. Press the vent mode ( ).

2. Press REC ( ) switch. The REC ( )indicator should illuminate.

3. Press REC ( ) switch again. The REC ( ) indicator should go out.

4. Listen for intake door position change (blowe r sound should cha nge slightly).

Can a symptom be duplicated?

YES >> GO TO 3.
NO >> GO TO 2.

2. PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to ATC-49, "
Can a symptom be duplicated?

YES >> Refer to ATC-31, "SYMPTOM TABLE" .
NO >> System OK.

3. CHECK FOR SERVICE BULLETINS

Check for any service bull et ins .

>> GO TO 4.

4. PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

C

D

E

F

Operational Check" .

G

H

I

ATC

Perform front air control self-diagn os is. Refe r to ATC-112, "
OK or NG

OK >> GO TO 5.
NG >> Perform power and ground circuit for front air control. Refer to ATC-51, "

Ground Circuit for Front A ir Control and Unified Meter and A/C Amp." .

Front Air Control Self - Diagnosis" .

5. PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-41, "
OK or NG

OK >> GO TO 6.
NG >> Perform appropriate malfunctioning sensor circuit.

FUNCTION CONFIRMATION PROCEDURE" .

6. PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-41, "
OK and NG

OK >> GO TO 7.
NG >> GO TO 12.

FUNCTION CONFIRMATION PROCEDURE" .

K

Power Supply and

L

M

Revision: May 2006 2007 Maxima

ATC-65

TROUBLE DIAGNOSIS

7. CHECK AMBIENT SENSOR CIRCUIT (CAUSE CANNOT BE CONFIRMED BY SELF-DIAGNOSIS)

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-97, "
OK or NG

OK >> GO TO 8.
NG >> Repair as necessary.

Ambient Sensor Circuit" .

8. CHECK IN-VEHICLE SENSOR CIRCUIT

Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to ATC-100, "
OK or NG

OK >> GO TO 9.
NG >> Repair as necessary.

9. CHECK SUNLOAD SENSOR CIRCUIT

Perform diagnostic procedure for the sunload sensor circuit. Refer to ATC-103, "
OK or NG

OK >> GO TO 10.
NG >> Repair as necessary.

10. CHECK INTAKE SENSOR CIRCUIT

Perform diagnostic procedure for the intake sensor circuit. Refer to ATC-106, "
OK or NG

OK >> GO TO 11.
NG >> Repair as necessary.

Intake Sensor Circuit" .

In-vehicle Sensor Circuit" .

Sunload Sensor Circuit" .

11. CHECK AIR MIX DOOR MOTOR PBR CIRCUIT

Perform diagnostic procedure for the air mix door motor circuit. Refer to ATC-61, "
OK or NG

OK >> If the symptom still exists, perform a complete operational check. Refer to ATC -49 , "Operational

Check" and check for other symptoms. Ref er to ATC-31, "SYMPTOM TABLE" . If no other symp-

toms exists replace unified meter and A/C amp. Refer to ATC - 11 3 , "

AMP." .

NG >> Repair as necessary.

Air Mix Door Motor Circuit" .

UNIFIED METER AND A/C

12. CHECK INTAKE DOOR CONTROL LINKAGE

Check intake door control linkage. Refer toAT C -12 0, "
OK or NG

OK >> Check LAN system circuit. Refer to ATC-55, "LAN System Circuit" .
NG >> R epai r or adjus t co ntrol linkage.

INTAKE DOOR MOTOR" .

Revision: May 2006 2007 Maxima

ATC-66

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION
Component Parts

Intake door control system components are:

● Unified meter and A/C amp.

● Intake door motor

● A/C LAN system (PBR built-in mode door motor, intake door motor and air mix door mot or)

● In-vehicle sensor

● Ambient sensor

● Sunload sensor

● Intake sensor

● Front air control

A

B

C

D

System Operation

The intake door control determines intake door position based on the ambient temperature, the intake air tem­perature and the in-vehicle temperature . When the DEFROST or OF F switches a re pushed or A/C swit ch is
OFF, the unified meter and A/C amp. sets the intake door at the FRESH positi on.

WJIA2212E

Intake Door Control Specification

E

F

G

H

I

ATC

K

L

WJIA0359E

Revision: May 2006 2007 Maxima

ATC-67

M

TROUBLE DIAGNOSIS

COMPONENT DESCRIPTION
Intake door motor

The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the unified meter and A/C amp. Motor
rotation is conveyed to a lever which activates the intake door.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

SYMPTO M: Intake do or motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to AT C- 5 5 , "

LAN CIRCUIT" .

RJIA1788E

DIAGNOSTIC PROCEDURE FOR

Revision: May 2006 2007 Maxima

ATC-68

TROUBLE DIAGNOSIS

Blower Motor Circuit EJS002UY

SYMPTOM:

● Blower motor operation is mal functioning.

A

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER

1. Press the top of the fan switch. Fan should operate.

2. Press the top of the fan switch and continue checking fan speed and fan symbol until all speeds are
checked.

Can the symptom be duplicated?

YES >> GO TO 3.
NO >> GO TO 2.

2. PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to ATC-49, "
Can a symptom be duplicated?

YES >> Refer to ATC-31, "SYMPTOM TABLE" .
NO >> System OK.

Operational Check" .

3. CHECK FOR SERVICE BULLETINS

Check for any service bull et ins .

>> GO TO 4.

4. PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

B

C

D

E

F

G

H

I

Perform front air control self-diagn os is. Refe r to ATC-112, "
OK or NG

OK >> GO TO 5.
NG >> Perform power and ground circuit for front air control. Refer to ATC-51, "

Ground Circuit for Front A ir Control and Unified Meter and A/C Amp." .

Front Air Control Self - Diagnosis" .

5. PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-41, "
OK or NG

OK >> GO TO 6.
NG >> Perf orm the ap pro pria te malfunctioning sens or ci rcuit.

FUNCTION CONFIRMATION PROCEDURE" .

6. PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-41, "

Code No. 41 42 43 44 45 46

Blower motor voltage 5V 11.75V 8.5V 8.5V 8.5V 11.75V

Does blower motor speed change ac cording to each code No.?

YES >> GO TO 7.
NO >> Check blower motor circuit. Refer to ATC-72, "

MOTOR" .

FUNCTION CONFIRMATION PROCEDURE" .

DIAGNOSTIC PROCEDURE FOR BLOWER

Power Supply and

ATC

K

L

M

Revision: May 2006 2007 Maxima

ATC-69

TROUBLE DIAGNOSIS

7. CHECK ENGINE COOLANT TEMPERATURE

Check engine coolant temperature.
Is engine coolan t tem pe rature below 56

YES >> GO TO 8.
NO >> Blower motor operation is normal.

°C (133°F)?

8. CHECK BLOWER MOTOR SPEED

Check blower mot or speed.
Is blower motor operating under starting blower speed control?

YES >> GO TO 9.
NO >> Check blower motor circuit. Refer to ATC-72, "

MOTOR" .

DIAGNOSTIC PROCEDURE FOR BLOWER

9. CHECK AMBIENT SENSOR CIRCUIT (CAUSE CANNOT BE CONFIRMED BY SELF-DIAGNOSIS)

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-97, "
OK or NG

OK >> GO TO 10.
NG >> Repair as necessary.

Ambient Sensor Circuit" .

10. CHECK IN-VEHICLE SENSOR CIRCUIT

Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to ATC-100, "
OK or NG

OK >> GO TO 11.
NG >> Repair as necessary.

In-vehicle Sensor Circuit" .

11. CHECK SUNLOAD SENSOR CIRCUIT

Perform diagnostic procedure for the sunload sensor circuit. Refer to ATC-103, "
OK or NG

OK >> GO TO 12.
NG >> Repair as necessary.

Sunload Sensor Circuit" .

12. CHECK INTAKE SENSOR CIRCUIT

Perform diagnostic procedure for the intake sensor circuit. Refer to ATC-106, "
OK or NG

OK >> If the symptom still exists, perform a complete operational check and check for other symptoms.

Refer to ATC -49, "

TOM TABLE" . If no other symptom exists replace unified meter and A/C amp. Refer to ATC-113,
"UNIFIED METER AND A/C AMP." .

NG >> Repair as necessary.

Operational Check" . and check for other symptoms. Refe r to ATC-31, "SYMP-

Intake Sensor Circuit" .

Revision: May 2006 2007 Maxima

ATC-70

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION
Component Parts

Fan speed control sy st em com po ne nts ar e:

● Unified meter and A/C amp.

● In-vehicle sensor

● Ambient sensor

● Sunload sensor

● Intake sensor

● Fan control amp.

● Front air control

System Operation

A

B

C

D

E

F

G

WJIA2213E

Automatic Mode

In the automatic mode, the blower motor speed is calculated by the unified meter and A/C amp. based on
input from the PBR, in-vehicle sensor, sunload sensor, intake sensor and ambient sensor.
When the air fl ow is inc reased, th e duty rati o of the b lower fan m otor′s drive signal is change d at 8%/sec. to
prevent a sudden increase in air flow .
In addition to manua l air flow control and the usual automatic air flow control, starting air flow control, low
water temperature starting control and high passenger compartment temperature starting control are avail­able.

Starting Blower Speed Control

Start Up From COLD SOAK Condition (Automatic mode)
In a cold start up condition where the engine coolant temperature is below 56°C (133°F), the blower will not
operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the
ambient and engine coolant temperature.
In the most extreme case (very low ambient) the blower starting delay will be 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56°C (133°F), at which time the blower speed will increase to the objective speed.

H

I

ATC

K

L

M

Start Up From Usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the AUTO switch is pushed. The blower speed will gradually
rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).

Revision: May 2006 2007 Maxima

ATC-71

TROUBLE DIAGNOSIS

Blower Speed Compensation

When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed.

Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The low speed will vary depending on the sunload. During conditions of low or no sunload, the blower
low speed is usual low speed (duty ratio 25%). During high sunload conditions, the display and unified meter
and A/C amp. causes the blower speed to increase (duty ratio 49%).

Blower Speed Control Specification

RJIA1996E

COMPONENT DESCRIPTION
Fan Control Amp.

The fan control a mplifie r is loc ated on the co oling u nit. The fan con­trol amp. receives a gate voltage from the unified meter and A/C
amp. to steplessly maintain the blower fan motor voltage in the 5 to
12 volt range (approx.).

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR

SYMPTOM: Blower motor operation is malfunctioning under starting
fan speed contr ol.

WJIA0049E

WJIA2215E

Revision: May 2006 2007 Maxima

ATC-72

TROUBLE DIAGNOSIS

1. CHECK POWER SUPPLY FOR BLOWER MOTOR

1. Disconnect blower motor harness connector.

2. Turn ignition switch ON.

3. Check voltage between blower motor harness connector M62
terminal 1 and ground.

Terminal

(+) (-)

Connector - Terminal

M62-1

Body ground 12V

Voltage (V)

(Approx.)

OK or NG

OK >> GO TO 2.
NG >> Check power supply circuit and 15A fuses [Nos. 10 and 11, located in the fuse block ( J/B)].

● Check blower mo tor relay. Refer to PG-12, "IGNITION POWER SUPPLY — IGNITION SW. IN

ON"

● If OK, check for open circuit in wiring harness.

Repair or replace as necessary.

● If OK, replace fuse and check wiring harness for short circuit.

Repair or replace as necessary.

2. CHECK BLOWER MOTOR

A

B

C

D

WJIA0056E

E

F

G

H

Check blower motor. Refer to ATC-75, "

Front Blower Motor" .

OK or NG

OK >> GO TO 3.
NG >> Replace blower motor. Refer to ATC-119, "

BLOWER MOTOR" .

3. CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND FAN CONTROL AMP.

1. Turn ignition switch OFF.

2. Disconnect fan control amp.

3. Check continuity between blower motor harness connector M62
terminal 2 and fan control amp. harness connector M64 terminal

3.

Terminals

Connector - Terminal Connector

M62-2 M64-3 Yes

OK or NG

OK >> GO TO 4.
NG >> Repair harness or connector.

Continuity

I

ATC

K

L

M

WJIA0857E

Revision: May 2006 2007 Maxima

ATC-73

TROUBLE DIAGNOSIS

4. CHECK VOLTAGE FOR FAN CONTROL AMP.

1. Turn ignition switch ON.

2. Press fan switch to any position except OFF or AUTO.

3. Check voltage between fan control amp. harness connector
M64 terminal 2 and ground.

Terminals

Voltage (V)

(Approx.)

WJIA2242E

Connector - Terminal

OK or NG

(+) (-)

M64-2 12V

Body ground

OK >> GO TO 5.
NG >> GO TO 7.

5. CHECK CIRCUIT CONTINUITY BETWEEN UNIFIED METER AND A/C AMP. AND FAN CONTROL

AMP.

1. Turn ignition sw itch OFF.

2. Disconnect unified meter and A/C amp.

3. Check contin uity between unifi ed meter and A/C amp. harness
connector M89 (A) terminal 47 and fan control amp. harness
connector M64 (B) terminal 3.

Terminals

Connector - Terminal Connector

M89-47 M64-3 Yes

Continuity

OK or NG

OK >> GO TO 6.
NG >> Repair harness or connector.

6. CHECK BODY GROUND CIRCUIT FOR FAN CONTROL AMP.

Check contin uity between fan control amp. harne ss connector M64
terminal 1 and ground.

Terminals Continuity

Connector - Terminal

M64-1

OK or NG

OK >> 1. Replace fan control amp. Refer to ATC-126, "FAN

CONTROL AMPLIFIER" .

2. Confirm that blower motor operation is normal.

NG >> Repair harness or connector.

Body ground Yes

WJIA2241E

WJIA0856E

Revision: May 2006 2007 Maxima

ATC-74

TROUBLE DIAGNOSIS

7. CHECK FAN CONTROL AMP. CIRCUIT BETWEEN FAN CONTROL AMP. AND UNIFIED METER AND

A/C AMP.

1. Turn ignition switch OFF.

2. Disconnect unified meter and A/C amp. connector .

3. Check continuity between fan control amp. harness connector
M64 terminal 2 a nd unified meter and A/C amp. harne ss con­nector M89 termi nal 60.

4.

Terminals Continuity

Connector - Terminal Connector

M64-2 M89-60

If OK, check harness for short.
OK or NG

OK >> 1. Replace unified meter and A/C amp. Refer to ATC-113, "Removal and Installation" .

2. C o nfi r m tha t blo w er mo tor opera tion is normal.

NG >> Repair harness or connector.

COMPONENT INSPECTION
Front Blower Motor

Confirm smooth rotation of the blower motor.

● Ensure that there are no foreign particles inside the blower unit.

● Apply 12 volts to terminal 1 and ground to terminal 2 and verify

that the motor operates freely and quietly.

Yes

WJIA1180E

A

B

C

D

E

F

G

H

I

WJIA2240E

ATC

K

L

M

Revision: May 2006 2007 Maxima

ATC-75

TROUBLE DIAGNOSIS

Magnet Clutch Circuit EJS002UZ

SYMPTOM: Magnet clutch does not engage.

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1. Turn ignition switch ON.

2. Press the AUTO switch.

3. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower
speed will depend on ambient, in-vehicle and set temperatures.)

Can the symptom be duplicated?

YES >> GO TO 3.
NO >> GO TO 2.

2. CHECK FOR ANY SYMPTOMS

Perform a complete opera tio nal check for any symptoms . Refe r to ATC-49, "
Does another symptom exist?

YES >> Refer to ATC-31, "SYMPTOM TABLE" .
NO >> System OK.

Operational Check" .

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4. PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

Perform front air control self-diagnosis. Refer to ATC-112, "
OK or NG

OK >> GO TO 5.
NG >> Perform power and ground circuit for front air control. Refer to ATC-51, "

Ground Circuit for Front Air Control and Unified Meter and A/C Amp." .

Front Air Control Self - Diagnosis" .

5. PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-41, "
OK or NG

OK >> GO TO 6.
NG >> Check appropriate malfunctioni ng sensor circui t.

FUNCTION CONFIRMATION PROCEDURE" .

Power Supply and

6. PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-41, "
OK and NG

OK >> GO TO 7.
NG >> Check for refrigerant pressure. Refer to ATC-88, "

FUNCTION CONFIRMATION PROCEDURE" .

Trouble Diagnoses for Unusual Pressure"

7. CHECK AMBIENT SENSOR CIRCUIT (CAUSE CANNOT BE CONFIRMED BY SELF-DIAGNOSIS.)

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-97, "
OK or NG

OK >> GO TO 8.
NG >> Repair as necessary.

Revision: May 2006 2007 Maxima

ATC-76

Ambient Sensor Circuit" .

TROUBLE DIAGNOSIS

8. CHECK INTAKE SENSOR CIRCUIT

Perform diagnostic procedure for the intake sensor circuit. Refer to ATC-106, "
OK or NG

OK >> If the symptom still exists, perform a complete operational check. Refer to ATC-4 9, "Operational

Check" and check for other symptoms. Refer to ATC-31 , "SYMPTOM TABLE" . If no other symp-

tom exists replace unified meter and A/C amp. Refer to ATC - 11 3, "

AMP." .

NG >> Repair as necessary .

Intake Sensor Circuit " .

UNIFIED METER AND A/C

A

B

C

D

E

F

G

H

I

ATC

K

L

M

Revision: May 2006 2007 Maxima

ATC-77

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION

Unified meter and A/C amp. controls compressor operation by ambient temperature and signal from ECM.

Low Temperature Protection Control

Unified meter and A/C amp. will turn the compressor ON or OFF as determined by a signal detected by intake
sensor.
When intake air temperature is higher than 4°C (39°F), the compres­sor turns ON. The compressor turns OFF when intake air tempe ra­ture is lower than 2.5°C (37°F).

RHA094GD

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

WJIA1175E

1. CHECK INTAKE SENSOR CIRCUIT

Check intake sensor. Refer to ATC-41, "
OK or NG

OK >> GO TO 2.
NG >> Malfunctioning intake sensor. Refer to ATC-106, "

FUNCTION CONFIRMATION PROCEDURE" .

Intake Sensor Circuit" .

2. PERFORM AUTO ACTIVE TEST

Refer to PG-22, "
Does magnet clutch operate?

YES or NO

YES >> ● WITH CONSULT-II

NO >> Check 10A fuse (No. 33, located in IPDM E/R), and GO TO 3.

Revision: May 2006 2007 Maxima

Auto Active T e st" .

GO TO 5.

● WITHOUT CONSULT-II

GO TO 6.

ATC-78

TROUBLE DIAGNOSIS

3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R connector and compressor (magnet
clutch) connector.

3. Check continuity between IPDM E/R harness connector E124
terminal 33 and compressor harness connector F3 terminal 1.

33 – 1 : Continuity should exist.

OK or NG

OK >> GO TO 4.
NG >> Repair harness or connector.

4. CHECK MAGNET CLUTCH OPERATION

Check for operatio n sound when appl ying bat tery voltage direct cu r­rent to terminal.

OK or NG

OK >> Replace IPDM E/R. Refer to PG-31, "Removal and

Installation of IPDM E/R" .

NG >> Replace magnet clutch. Refer to ATC-133, "

and Installation for Compressor Clutch" .

Removal

A

B

C

D

WJIA0331E

E

F

G

H

5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

Check compress or ON/OFF signal. Refer to AT C - 30 , "

Function (BCM)" .

A/C SW ON : COMP ON SIG ON
A/C SW OFF : COMP ON SIG OFF

OK or NG

OK >> GO TO 8.
NG >> GO TO 6.

CONSULT-II

6. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND UNIFIED METER AND A/C AMP.

1. Turn ignition switch OFF.

2. Disconnect BCM connector and unified meter and A/C amp.
connector.

3. Check continuity b etwee n BCM ha rness co nnec tor M18 termi nal
27 and unified meter and A/C amp. harness connector M89 ter­minal 42.

SJIA0197E

I

ATC

K

L

SJIA0270E

M

27 – 42 : Continuity should exist.

OK or NG

OK >> GO TO 7.
NG >> Repair harness or connector.

Revision: May 2006 2007 Maxima

ATC-79

WJIA0332E

TROUBLE DIAGNOSIS

7. CHECK VOLTAGE FOR UNIFIED METER AND A/C AMP. (COMPRESSOR ON SIGNAL)

1. Reconnect BCM connector and unified meter and A/C amp.
connector.

2. Turn ignition switch ON.

3. Check voltage between unified meter and A/C amp. harness
connector M89 terminal 42 and ground.

Terminals

(+)

Unified

meter and A/

C amp. con-

nector

M89 42 Ground

Terminal No.

(-)

Condition

A/C switch: ON 0V

A/C switch: OFF 5V

OK or NG

OK >> GO TO 8.
NG-1 >> If the voltage is approx. 5V when A/C switch is ON: Replace unified meter and A/C amp. Refer to

ATC-113, "

UNIFIED METER AND A/C AMP." .

NG-2 >> If the voltage is approx. 0V when A/C switch is OFF: Replace BCM. Refer to BCS-25, "

Voltage

(Approx.)

RJIA1446E

BCM" .

8. CHECK REFRIGERANT PRESSURE SENSOR

WITH CONSULT-II

1. Start engine.

2. Check voltage of refrigerant pressure sensor. Refer to ATC-30, "

WITHOUT CONSULT-II

1. Start engine.

2. Check voltage between ECM harness connector F54 terminal 70 and ground.

Terminals

(+)

ECM con-

nector

F54 70 Ground A/C switch: ON 3.60 - 3.88V

Terminal No.

(-)

Condition

Voltage

(Approx.)

OK or NG

OK >> ● WITH CONSULT-II

GO TO 9.

● WITHOUT CONSULT-II

GO TO 10.

NG >> Refer to EC-649, "

REFRIGERANT PRESSURE SENSOR" .

CONSULT-II Function (BCM)" .

Revision: May 2006 2007 Maxima

ATC-80

TROUBLE DIAGNOSIS

9. CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to ATC-30, "

(BCM)" .

FAN CONTROL SWITCH ON : FAN ON SIG ON
FAN CONTROL SWITCH OFF : FAN ON SIG OFF

OK or NG

OK >> GO TO 12.
NG >> GO TO 10.

CONSULT-II Function

10. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND UNIFIED METER AND A/C AMP.

1. Turn ignition switch OFF.

2. Disconnect BCM connector and unified meter and A/C amp.
connector.

3. Check continuity between BCM harness connector M18 (A) ter­minal 28 and unified meter and A/C amp. harness connector
M89 (B) terminal 57.

28 – 57 : Continuity should exist.

OK or NG

OK >> GO TO 11.
NG >> Repair harness or connector.

11. CHECK VOLTAGE FOR UNIFIED METER AND A/C AMP. (FAN ON SIGNAL)

A

B

C

D

SJIA0270E

E

F

G

H

WJIA2247E

I

1. Reconnect BCM connector and unified meter and A/C amp.
connector.

2. Turn ignition switch ON.

3. Check voltage between unified meter and A/C amp. harness
connector M89 terminal 57 and ground.

Terminals

(+)

Unified meter
and A/C amp.

connector

M89 57 Ground

Terminal No.

(-)

Condition

A/C switch: ON
Blower motor
operates

A/C switch: OFF 5V

Voltage

(Approx.)

RJIA1449E

0V

OK or NG

OK >> GO TO 12.
NG-1 >> If the voltage is approx. 5V when blower motor is ON: Replace unified meter and A/C amp. ATC-

113, "UNIFIED METER AND A/C AMP." .

NG-2 >> If the voltage is approx. 0V when blower motor is OFF: Replace BCM. Refer to BCS-25, "

BCM" .

ATC

K

L

M

Revision: May 2006 2007 Maxima

ATC-81

12. CHECK CAN COMMUNICATION

TROUBLE DIAGNOSIS

Check CAN communication. Refer to LAN-44, "

● BCM – ECM

● ECM – IPDM E/R

● ECM – Unified meter and A/C amp.

OK or NG

OK >> Insp ec tio n End
NG >> Repair or replace malfunctioning part(s).

TROUBLE DIAGNOSIS" .

Revision: May 2006 2007 Maxima

ATC-82

TROUBLE DIAGNOSIS

Insufficient Cooling EJS002V0

SYMPTOM: Insufficient cooling

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1. Press the AUTO switch.

2. Turn temperature cont rol dial (driver) counterclockwise until 16° C (32° F) is displayed.

3. Check for cold air at discharge air outlets.

Can the symptom be duplicated?

YES >> GO TO 3.
NO >> GO TO 2.

A

B

C

D

2. CHECK FOR ANY SYMPTOMS

Perform a compl ete operational check for any sym ptoms. Refer to ATC-49, "
Does another symptom exist?

YES >> Refer to ATC-31, "SYMPTOM TABLE" .
NO >> System OK.

Operational Check" .

3. CHECK FOR SERVICE BULLETINS

Check for any service bull et ins .

>> GO TO 4.

4. PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

Perform front air control self-diagn os is. Refe r to ATC-112, "
OK or NG

OK >> GO TO 5.
NG >> Perform power and ground circuit for front air control. Refer to ATC-51, "

Ground Circuit for Front A ir Control and Unified Meter and A/C Amp." .

Front Air Control Self - Diagnosis" .

5. PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-41, "
OK or NG

OK >> GO TO 6.
NG >> Perform appropriate malfunctioning sensor circuit.

FUNCTION CONFIRMATION PROCEDURE" .

E

F

G

H

I

ATC

Power Supply and

K

L

M

6. PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-41, "
OK and NG

OK >> GO TO 7.
NG >>

● Check Magnet clutch mechanism. Refer to ATC-76, "Magnet Clutch Circuit" .

● Check LAN system circuit. Refer to ATC-55, "LAN System Circuit" .

● Check blower motor circuit. Refer to ATC-69, "Blower Motor Circuit" .

FUNCTION CONFIRMATION PROCEDURE" .

7. CHECK COMPRESSOR DRIVE BELT TENSION

Check compre ssor belt tension. Refer to EM-13, "
OK or NG

OK >> GO TO 8.
NG >> Adj ust or replace compressor belt. Refer to EM-14, "

Belt" .

Revision: May 2006 2007 Maxima

Checking Drive Belts" .

Generator and Air Cond itioner Compre ssor

ATC-83

TROUBLE DIAGNOSIS

8. CHECK AIR MIX DOOR OPERATION

Check and verify air mix door operation. Refer to ATC-61, "
Does air mix door operate correctl y ?

YES >> GO TO 9.
NO >> Repair or replace air mix door control linkage.

Air Mix Door Motor Circuit" .

9. CHECK COOLING FAN MOTOR OPERATION

Check and verify cooling fan motor for smooth operation. Refer to EC-499, "
Does cooling fan motor operate correctly?

YES >> GO TO 10.
NO >> Check cooling fan motor. Refer to EC-499, "

DTC P1217 ENGINE OVER TEMPERATURE" .

Description" .

10. CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE

Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/
recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.

>> GO TO 11.

11. CHECK REFRIGERANT PURITY

1. Connect recovery/recycling equipment to vehicle.

2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
OK or NG

OK >> GO TO 12.
NG >> Check contaminated refrigerant. Refer to AT C-4, "

Contaminated Refrigerant" .

12. CONNECT ACR2005 TO VEHICLE

Confirm refrigerant purity in vehicle A/C system using ACR2005 and refrigerant identifier.
OK or NG

OK >> GO TO 13.
NG >> Check contaminated refrigerant. Refer to AT C-4, "

Contaminated Refrigerant" .

13. CHECK FOR EVAPORATOR FREEZE UP

Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?

YES >> Perform performance test diagnoses. Refer to ATC-85, "PERFORMANCE TEST DIAGNOSES" .
NO >> GO TO 14.

14. CHECK REFRIGERANT PRESSURE

Check refrigerant pressur e with manifold gauge connected. Refer to ATC-87, "
OK or NG

OK >> GO TO 15.
NG >> Perform performance test diagnoses. Refer to ATC-85, "

PERFORMANCE TEST DIAGNOSES" .

Test Re ading " .

15. CHECK AIR DUCTS

Check ducts fo r air leaks.
OK or NG

OK >> Perform temperature setting trimmer procedure. Refer to ATC-46, "AUXILIARY MECHANISM:

TEMPERAT URE SETTING TRIMMER" .

NG >> Repair air leaks.

Revision: May 2006 2007 Maxima

ATC-84

TROUBLE DIAGNOSIS

PERFORMANCE TEST DIAGNOSES

A

B

C

D

E

F

G

H

I

ATC

K

L

M

WJIA2248E

*1 ATC-87, "PERFORMANCE CHART" *2 ATC-61, "Air Mix Door Motor Circuit" *3 ATC-88, " Trouble Diagnoses for

Unusual Pressure"

Revision: May 2006 2007 Maxima

ATC-85