Nissan Maxima 2008 User Manual

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Edition: July 2007 Revision: July 2007 Publication No. SM8E-1A34U0

QUICK REFERENCE INDEX

GENERAL INFORMATION

B ENGINE

TRANSMISSION/ TRANSAXLE

D DRIVELINE/AXLE

E SUSPENSION

F BRAKES

G STEERING H RESTRAINTS

I BODY

J AIR CONDITIONER

K ELECTRICAL

L MAINTENANCE

General Information

Engine Mechanical

Engine Lubrication System

Engine Cooling System

Engine Control System

Fuel System

Exhaust System

ACC

Accelerator Control System

CVT

FAX

Front Axle

RAX

Rear Axle

FSU

Front Suspension

RSU

Rear Suspension

Road Wheels & Tires

Brake System

Parking Brake System

BRC

Brake Control System

Power Steering System

Seat Belts

SRS

Supplemental Restraint System (SRS)

Body, Lock & Security System

Glasses, Window System & Mirrors

Roof

Exterior & Interior

Instrument Panel

Seat

ATC

Automatic Air Conditioner

Starting & Charging System

Lighting System

Driver Information System

Wiper, Washer & Horn

BCS

Body Control System

LAN

LAN System

Audio Visual, Navigation & Telephone System

ACS

Auto Cruise Control System

Power Supply, Ground & Circuit Elements

Maintenance

A B C D E

© 2007 NISSAN NORTH AMERICA, INC. All rights reserved. No p a rt of this Se rvice Manual m ay be reproduc ed or sto red in a retrie val s yste m, or tran smit ted in an y form, or by any means, electroni c, mechanical, pho to-copyin g, recording or otherwise, with out the prior written permi ssion of Nissan North America, Inc., Gardena, California.

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This manual contains maintenance and repair procedures for the 2008 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 specifica lly 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: (248) 488-3910

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:

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QUICK REFERENCE CHART: MAXIMA

2008

QUICK REFERENCE CHART: MAXIMA

Engine Tune-up Data INFOID:0000000003289043

GENERAL SPECIFICATIONS

Cylinder arrangement V-6

Displacement cm Bore and stroke mm (in) 95.5 x 81.4 (3.76 x 3.205) Valve arrangement DOHC Firing order 1-2-3-4-5-6

Number of piston rings

Number of main bearings 4 Compression ratio 10.3:1

Compression pressure kPa

(kg/cm

, psi)/300 rpm

(in3)

Compression 2 Oil 1

Standard 1,275 (13.0, 185) Minimum 981 (10.0, 142) Differential limit be-

tween cylinders

3,498 (213.45)

98 (1.0, 14)

Cylinder number

SEM713A

Va lve timing (IVTC - OFF)

PBIC0187E

abcdef

240° 238° - 6° 64° 8° 52°

Unit: degree

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QUICK REFERENCE CHART: MAXIMA

2008

Front Wheel Alignment (Unladen*1) INFOID:0000000003289046

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′ (2.67°) Maximum 3°35

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°)

′ (3.58°)3°25′ (3.42°)

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 mats in designated po sitions. *2: On power steering models, wheel turning force (at circu mference of steering wheel) of 98 to 147 N (10 to 15 kg, 22 to 33 lb) wi th

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 0°2′ (0.03°)0°3′ (0.05°) Maximum — — Minimum 32°00 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°)—

′ (32.0°)31°00′ (31.0°)—

Rear Wheel Alignment (Unladen*) INFOID:0000000003289048

Market

United States

and Canada

Mexico

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QUICK REFERENCE CHART: MAXIMA

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 en gine oil full. Spare tire, jack, hand tools and mats in designated positions.

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°)

2008

Wheelarch Height (Unladen*) INFOID:0000000003289047

Unit: mm (in)

SFA818A

Market United S tates and Canada Mexico Tire 225/55R17 245/45R18 225/55R17 245/45R18 Front (Hf) 738 (29.06) 737 (29.02) 787 (30.98) 761 (29.96) Rear (Hr) 705 (27.76) 705 (27.76) 743 (29.25) 726 (28.58)

*: Fuel, radiator coolant and en gine oil full. Spare tire, jack, hand tools and mats in designated positions.

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QUICK REFERENCE CHART: MAXIMA

2008

Brake Speci fi cation INFOID:0000000003289049

Unit: mm (in)

Brake model CLZ25VE disc brake Cylinder bore diameter 57.2 (2.25)

Front brake

Rear brake

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

Brake booster

Pad Length × width × thickness

Rotor outer diameter × thickness 320 × 28 (12.60 × 1.10) Brake model Kiriu Cylinder bore diameter 34.93 (1.375) 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 × 31.9 × 8.5 (3.268 × 1.256 × 0.335)

Disc Brake INFOID:0000000003289050

Unit: mm (in)

Brake model CLZ25VE Kiriu Pad wear limit Minimum thickness 2.0 (0.079) 1.0 (0.039)

Maximum runout 0.07 (0.0028) 0.05 (0.0020)

Rotor repair limit

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

sured at 8 positions)

0.015 (0.0006) or less

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QUICK REFERENCE CHART: MAXIMA

2008

Brake Pedal

INFOID:0000000003289051

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 reinforcement 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 swit ch

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)

Fluids and Lubricants INFOID:0000000003289052

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

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

Capacity (approximate)

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QUICK REFERENCE CHART: MAXIMA

2008

Description

Cooling system 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 Brake fluid — — — Brake grease — — — Brake pad plate grease — — — Multi-purpose grease — — — Windshield washer fluid — — — Air conditioning system refriger ant 0.55 ± 0.025 kg 1.21 ± 0.055 lb 1.21 ± 0.055 lb Air conditioning system oil

With reservoir at MAX level

Liter US measure Imp measure

8.5 2 1/4 gal 1 7/8 gal

150 m

Capacity (approximate)

5.03 fl oz 5.3 fl oz

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ENGINE

Revision: July 2007 2008 Maxima

ACC

SECTION ACC

ACCELERATOR CONTROL SYSTEM

CONTENTS

SERVICE INFORMATION ............................2

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

Precaution for Supplemental Restrain t System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-

SIONER" ...................................................................

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

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

SERVICE DATA AND SPECIFICATIONS

(SDS) ..................................................................

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

ACC-1

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PRECAUTIONS

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

SERVICE INFORMATION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" INFOID:0000000001720744

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted. Information necessary to service the system safely is included in the SRS and SB section of this Service Manual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the SRS section.

• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors.

ACC-2

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ACCELERATOR CONTROL SYSTEM

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

ACCELERATOR CONTROL SYSTEM

Removal and Installation INFOID:0000000001720745

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 sensor as shown.

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

pedal position sensor as shown.

LBIA0333E

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-497, "

CAUTION:

• Do not disassemble the pedal assembly. Do not remove

the accelerator pedal position sensor from the pedal assembly.

• Avoid impact from dropping during handling.

• Keep the pedal assembly away from water.

INSTALLATION

1. Installation is in the reverse order of removal.

• Check the accelerator pedal for smooth operation. There should be no binding or sticking when applying

or releasing the accelerator pedal.

• Check that the accelerator pedal moves through the full speci-

fied distance of pedal travel.

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

Component Inspection".

LBIA0334E

ACC

CAUTION:

When the harness connector of the accelerator pedal position sensor is disconnected, perform the "Accelerator pedal released position learning". Refer to EC-75, "

Accelerator

Pedal Released Position Learning".

LBIA0062E

ACC-3

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SERVICE DATA AND SPECIFICATIONS (SDS)

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

SERVICE DATA AND SPECIFICATIONS (SDS)

Accelerator Control INFOID:0000000001720746

Pedal TRAVEL

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

ACC-4

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ELECTRICAL

Revision: July 2007 2008 Maxima

SECTION ACS

AUTO CRUISE CONTROL SYSTEM

CONTENTS

SERVICE INFORMATION ............................2

AUTOMATIC SPEED CONTROL DEVICE

(ASCD) ...............................................................

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

ACS

ACS-1

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AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

SERVICE INFORMATION

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Description INFOID:0000000001721978

Regarding the information for ASCD system, refer to EC-27.

ACS-2

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AIR CONDITIONER

Revision: July 2007 2008 Maxima

SECTION ATC

AUTOMATIC AIR CONDITIONER

CONTENTS

SERVICE INFORMATION ............................3

PRECAUTIONS ...................................................3

Precaution for Supplemental Restrain t System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-

SIONER" ...................................................................

Precaution for Working with HFC-134a (R-134a) ......3

Contaminated Refrigerant .........................................3

General Refrigerant Precaution ................................4

Precaution for Leak Detection Dye ...........................4

A/C Identification Label .............................................4

Precaution for Refrigerant Connectio n ......................4

Precaution for Service of Compressor ......................8

Precaution for Service Equipment .............................8

PREPARATION ..................................................10

Special Service Tool ................................. ... .... .......10

HFC-134a (R-134a) Service Too l a nd Eq uipment ....10

Commercial Service Tool ........................................12

REFRIGERATION SYSTEM ..............................14

Refrigerant Cycle ....................................................14

Refrigerant System Protection ................................14

Component Part Location ...................... ... ... .... .......15

OIL ......................................................................16

Maintenance of Oil Quantity in Compressor ...........16

AIR CONDITIONER CONTROL .........................18

Description of Air Conditioner LAN Control Sys-

tem ..........................................................................

System Construction ...............................................18

Description of Control System .................................20

Control Operation ....................................................21

Fail-Safe Function ...................................................22

Discharge Air Flow ..................................................22

System Description .................................................23

CAN Communication System Description ...............24

TROUBLE DIAGNOSIS .....................................25

CONSULT-III Function (BCM) .................................25

How to Perform Trouble Diagnosis for Quick and

Accurate Repair .......................................................

Component Parts and Harness Connector Loca-

tion ................................ ................................... ........

Schematic ........................... ................................ .....29

Wiring Diagram - A/C,A - .........................................30

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

ence Value ...............................................................

A/C System Self-Diagnosis Function .......................34

Operational Check ...................................................40

Power Supply and Ground Circuit for Front Air

Control and Unified Meter and A/C Amp .................

LAN System Circuit ......... ... ... ..................................45

Mode Door Motor Circuit .........................................47

Air Mix Door Motor Circuit .......................................50

Air Mix Door Motor PBR Circuit ...............................53

Intake Door Motor Circuit .........................................53

Blower Motor Circuit ................................................55

Magnet Clutch Circuit ..............................................61

Insufficient Cooling ..................................................65

Insufficient Heating ..................................................73

Noise .......................................................................74

Self-Diagnosis .........................................................75

Memory Function .....................................................77

Ambient Sensor Circuit ............................................77

In-vehicle Sensor Circuit ............... ... ........................80

Sunload Sensor Circuit ............................................82

Intake Sensor Circuit .................................... ... ........85

Multiplex Communication Circuit .............................87

A/C Display (without NAVI) ......................................89

Front Air Control Self - Diagnosis ............................90

UNIFIED METER AND A/C AMP. .....................92

Removal and Installation .........................................92

AMBIENT SENSOR ..........................................93

Removal and Installation .........................................93

IN-VEHICLE SENSOR ......................................94

Removal and Installation .........................................94

ATC

ATC-1

Page 17

SUNLOAD SENSOR ......................................... 95

Revision: July 2007 2008 Maxima

Removal and Installation ........................................ 95

INTAKE SENSOR .............................................. 96

Removal and Installation ........................................ 96

BLOWER UNIT ..................................................97

Removal and Installation ........................................ 97

BLOWER MOTOR .............................................98

Removal and Installation ........................................ 98

INTAKE DOOR MOTOR .................................... 99

Removal and Installation ........................................ 99

IN-CABIN MICROFILTER ................................ 100

Removal and Installation .......................................100

HEATER & COOLING UNIT ASSEMBLY ....... 101

Removal and Installation .......................................101

HEATER CORE ............................................... 102

Removal and Installation .......................................102

MODE DOOR MOTOR .................................... 103

Removal and Installation .......................................103

AIR MIX DOOR MOTOR .................................. 104

Removal and Installation .......................................104

FAN CONTROL AMPLIFIER ........................... 105

Removal and Installation ....................................... 105

DUCTS AND GRILLES ....................................106

Removal and Installation ....................................... 106

REFRIGERANT LINES .....................................109

HFC-134a (R-134a) Service Procedure ................ 109

Component ........................................................... 111

Removal and Installation for Compressor ............. 112

Removal and Installation for Compressor Clutch ..112 Removal and Installation for Low-Pressure Flexi-

ble Hose ........................... ... ... .... ... ... .....................

Removal and Installation for High-pressure Flexi-

ble Hose ........................... ... ... .... ... ... .....................

Removal and Installation for High-pressure Pipe .. 116 Removal and Installation for Refrigerant Pressure

Sensor ........................... ............. ............ .......... .....

Removal and Installation for Condenser ............... 116

Removal and Installation for Evaporator ............... 117

Removal and Installation for Expansion Valve ......118

Checking of Refrigerant Leaks .............................. 119

Checking System for Leaks Using the Fluorescent

Leak Detector ......... ... .... ... .....................................

Dye Injection .......................... .... ... ... ... .................. 120

Electronic Refrigerant Leak Detector .................... 120

115

116

119

SERVICE DATA AND SPECIFICATIONS

(SDS) ................................................................

Service Data and Specification (SDS) .................. 123

123

ATC-2

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< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

PRECAUTIONS

SERVICE INFORMATION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" INFOID:0000000001721274

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the SRS section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

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

Precaution for Working with HFC-134a (R-134a) INFOID:0000000001721275

WARNING:

• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants

are mixed compressor failure is likely to occur. Refer AT C - 3 , " mine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use refrigerant recovery/recycling equipment and refrigerant identifier .

• Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If

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

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

handling precautions must be observed:

- When removing refrigerant components from a vehicle, immediately cap (seal) the component to

minimize the entry of moisture from the atmosphere.

- When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just

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

- Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without

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

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

Remove R-134a from the A/C system using certified service equipment meeting requirements of SAE J2210 (R-134a recycling equipment), or SAE J2209 (R-134a recovery equipment). If accidental system discharge occurs, ventilate work area before resuming service. Additional health and safety information may be obtained from refrigerant and oil manufacturers.

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

Contaminated Refrigerant". To deter-

Contaminated Refrigerant INFOID:0000000001721276

If a refrigerant other than pure R-134a is identified in a vehicle, your options are:

• Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into

the atmosphere.

• Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant

supply.

• Suggest the customer return the vehicle to the location of previous service where the contamination may

have occurred.

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

ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility does

ATC

ATC-3

Page 19

PRECAUTIONS

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available service. This refrigerant must be disposed of in accordance with all federal and local regulations. In addition, replacement of all refrigerant system components on the vehicle is recommended.

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

General Refrigerant Precaution INFOID:0000000001721277

WARNING:

• Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the refrigerant every time an air conditioning system is discharged.

• Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or air conditioning system.

• Do not store or heat refrigerant containers above 52°C (125°F).

• Do not heat a refrigerant container with an open flame; if container warming is required, place the bottom of the container in a warm pail of water.

• Do not in tentionally drop, puncture, or incinerate refrigerant containers.

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

• Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent suffocation.

• Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air conditioning systems with compressed air during repair. Some mixtures of air and HFC-134a (R-134a) have been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause injury or property damage. Additional health and safety information may be obtained from refrigerant manufacturers.

Precaution for Leak Detection Dye INFOID:0000000001721278

• The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet (UV) lamp is required to illuminate the dye when inspecting for leaks.

• Always wear fluorescence enhancing UV safety glasses to protect your eyes and enhance the visibility of the fluorescent dye.

• The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluorescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector (J-

41995).

• For your safety and the customer's satisfaction, read and follow all manufacturer's operating instructions and precautions prior to performing work.

• A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).

• Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a future service.

• Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled, clean immediately with the approved dye cleaner. Fluorescent dye lef t on a surface for an extended period of time cannot be removed.

• Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.).

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

• Leak detection dyes for R-134a and R-12 A/C systems are different. Do not use R-134a leak detection dye in R-12 A/C systems or R-12 leak detection dye in R-134a A/C systems or A/C system damage may result.

• The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure occurs.

A/C Identification Label INFOID:0000000001721279

Vehicles with factory installed fluorescent dye have this identification label on the underside of hood.

NOTE:

Vehicles with factory installed fluorescent dye have a green label.

Precaution for Refrigerant Connection INFOID:0000000001721280

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

ATC-4

Page 20

PRECAUTIONS

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

FEATURES OF NEW TYPE REFRIGERANT CONNECTION

• The O-ring has been relocated. It has also been provided with a groove for proper installation. This eliminates the chance of the O-ring being caught in, or damaged by, the mating part. The sealing direction of the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing characteristics.

• The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facilitating piping connections.

SHA815E

ATC

ATC-5

Page 21

PRECAUTIONS

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

O-RING AND REFRIGERANT CONNECTION

WJIA0982E

CAUTION:

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

O-Ring Part Numbers and Specifications

ATC-6

Page 22

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

PRECAUTIONS

Connection type

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

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

New

Former 92475 71L00 11.0 (0.433) 2.4 (0.094)

New

Former 92475 72L00 14.3 (0.563) 2.3 (0.091)

New

SHA814E

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

Former 92477 N8200 17.12 (0.6740) 1.78 (0.0701)

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

O-ring

size

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

92472 N8210 10.9 (0.429) 2.43 (0.0957)

92473 N8210 13.6 (0.535) 2.43 (0.0957)

92474 N8210 16.5 (0.650) 2.43 (0.0957)

WARNING:

Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.

CAUTION:

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

• When the compressor is removed, store it in the same position as it is when mounted on the car. Failure to do so will cause oil to enter the low pressure chamber.

• When connecting tubes, always use a torque wrench and a back-up wrench.

• After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.

• When installing an air conditioner in the vehicle, connect the pipes as the final stage of the operation. Do not remove the seal caps of pipes and other components until just before required for connection.

• Allow components stored in cool areas to warm to working area temperature before removing seal caps. This prevents condensation from forming inside A/C components.

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

• Always replace used O-rings.

• When connecting tube, apply oil to circle of the O-rings shown in illustration. Be careful not to apply oil to threaded portion. 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.

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

ATC

RHA861F

ATC-7

Page 23

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

PRECAUTIONS

Precaution for Service of Compressor

INFOID:0000000001721281

• 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-16, "

Maintenance of Oil Quantity in Compressor".

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

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

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

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

• After replacing the compressor magnet clutch, apply voltage to the new one and check for normal

operation. Refer to ATC-61, "

Magnet Clutch Circuit".

Precaution for Service Equipment INFOID:0000000001721282

RECOVERY/RECYCLING EQUIPMENT

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

ELECTRONIC LEAK DETECTOR

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

VACUUM PUMP

The oil contained inside the vacuum pump is not compatible with the specified oil for HFC-134a (R-134a) A/C systems. The vent side of the vacuum pump is exposed to atmospheric pressure so the vacuum pump oil may migrate out of the pump into the service hose. This is possible when the pump is switched off af ter evacuation (vacuuming) and hose is connected to it. To prevent this migration, use a manual valve situated near the hose-to-pump connection, as follows.

• Usually vacuum pumps have a manual isolator valve as part of the pump. Close this valve to isolate the service hose from the pump.

• For pumps without an isolator, use a hose equipped with a manual shut-off valve near the pump end. Close the valve to isolate the hose from the pump.

• If the hose has an automatic shut off valve, disconnect the hose from the pump: as long as the hose is connected, the valve is open and lubricating oil may migrate.

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

RHA270D

MANIFOLD GAUGE SET

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

SHA533D

ATC-8

Page 24

PRECAUTIONS

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

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.

SERVICE COUPLERS

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

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

REFRIGERANT WEIGHT SCALE

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

RHA272D

RHA273D

ATC

RHA274D

CHARGING CYLINDER

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

ATC-9

Page 25

PREPARATION

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

PREPARATION

Special Service Tool INFOID:0000000001721283

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 Tool and Equipment INFOID:0000000001721284

Never mix HFC-134a refrigerant and/or its specified oil with CFC-12 (R-12) refrigerant and/or its oil. Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/oil. Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles refrigerant and/or oil) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid mixed use of the refrigerants/oil. Adapters that convert one size fitting to another must never be used refrigerant/oil contamination will occur and compressor failure will result.

Tool number (Kent-Moore No.) Tool name

HFC-134a (R-134a) (—) Refrigerant

— (—) 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

S-NT196

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

ATC-10

Page 26

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

PREPARATION

Tool number (Kent-Moore No.) Tool name

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

— (J-41995) Electronic refrigerant leak detector

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

— (J-42220) Fluorescent dye leak detector

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

WJIA0293E

SHA438F

AHA281A

ZHA200H

Description

Refrigerant recovery, recycling and recharging

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

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

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

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

ATC

SHA439F

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

SHA440F

ATC-11

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

Page 27

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

PREPARATION

Tool number (Kent-Moore No.) Tool name

— (J-43872) Refrigerant dye cleaner

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

Service hoses:

• (J-39500-72B)

High side hose

• (J-39500-72R)

Low side hose

• (J-39500-72Y)

Utility hose

Service couplers:

• (J-39500-20A)

High side coupler

• (J-39500-24A)

Low side coupler

Description

For cleaning dye spills.

SHA441F

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

S-NT201

Hose fitting to service hose:

• M14 x 1.5 fitting is optional or permanently 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

• 1/2”-16 ACME

S-NT203

Commercial Service Tool

ATC-12

INFOID:0000000001721285

Page 28

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

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

WHA230

ATC

ATC-13

Page 29

REFRIGERATION SYSTEM

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

REFRIGERATION SYSTEM

Refrigerant Cycle INFOID:0000000001721286

Refrigerant flow

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

Refrigerant System Protection INFOID:0000000001721287

Refrigerant pressure sensor

The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sensor, located on the condenser. If the system pressure rises above or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM. ECM makes the A/C relay go OFF and stops the compressor when pressure on the high pressure side

detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm

(1.22 kg/cm

, 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/

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

the atmosphere.

, 398 psi), or below about 120 kPa

WJIA0358E

ATC-14

Page 30

REFRIGERATION SYSTEM

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< SERVICE INFORMATION >

Component Part Location INFOID:0000000001721288

ATC

WJIA0294E

ATC-15

Page 31

OIL

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

OIL

Maintenance of Oil Quantity in Compressor INFOID:0000000001721289

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 cooling (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 needed.

Oil Adjustment Procedure for Compressor Replacement

Amount of oil

m (US fl oz, Imp fl oz)

30 (1.0, 1.1) Large leak

— Small leak *1

Remarks

ATC-16

Page 32

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

OIL

WJIA1716E

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

4. Measuring cup X 5. Measuring cup Y 6. New oil A. Drain oil from the new compressor

into clean container

D. Install new oil equal to recorded

amounts in measuring cups X plus Y

B. Record amount of oil recovered C.

Add an additional 5 m (0.2 US fl oz,

0.2 Imp fl oz) of new oil when repl acing 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 the recovery/recycling equipment to vehicle. Confirm refrigerant purity in supply tank using the recovery/recycling equipment and refrigerant identifier. If NG, refer to ATC-3, "

Contaminated Refrigerant".

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

Contaminated Refrigerant".

4. Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure oil discharged into the recovery/recycling equipment.

5. Drain the oil from the “old” (removed) compressor into a graduated container and recover the amount of oil drained.

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

7. Measure an amount of new oil installed equal to amount drained from “old” compressor. Add this oil to “new” compressor through the suction port opening.

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

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

CAUTION:

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

ATC

ATC-17

Page 33

AIR CONDITIONER CONTROL

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

AIR CONDITIONER CONTROL

Description of Air Conditioner LAN Control System INFOID:0000000001721290

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

SJIA0262E

System Construction INFOID:0000000001721291

A small network is constructed between the unified meter and A/C amp., air mix door motor, mode door motor and intake door motor. The unified meter and A/C amp. and motors are connected by data transmission lines and motor power supply lines. The LAN communication is achieved using the dedicated communication 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 functions are contained in LCU's built into the air mix motor, mode door motor, and intake door motor.

• Address

• Motor opening angle signals

• Data transmission

• Motor stop and drive decision

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

• Comparison

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

RJIA1747E

OPERATION

The unified meter and A/C amp. sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door motor LCU and intake door motor LCU. The mode door motor, air mix door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals are sent from the unified meter and A/C amp. to each of the motors and are compared by the LCUs in each motor with the existing position and opening angles. Subsequently , HOT/COLD, DEFROST/VENT or FRESH/RECIRCULATION 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.

ATC-18

Page 34

AIR CONDITIONER CONTROL

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

RJIA1748E

TRANSMISSION DATA AND TRANSMISSION ORDER

Unified meter and A/C amp. data is transmitted consecutively to each of the door motors following 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 door motor. If the addresses are identical, the opening angle data and error check signals are received by the door motor 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 indicated door opening angle of each door motor. Error check: Procedure by which sent and received data is checked for errors. Error data is then compiled. The error check 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 leakage from transmission lines

• Signal level 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.

ATC

RJIA1749E

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.

FAN SPEED CONTROL

Blower speed is automatically controlled based on temperature setting, ambient temperature, in-vehicle temperature, intake temperature, amount of sunload and air mix door position.

ATC-19

Page 35

AIR CONDITIONER CONTROL

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

When pressing AUTO switch, the blower motor starts to gradually increase air flow volume. When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flowing.

INTAKE DOOR CONTROL

The intake doors are automatically controlled by: The temperature setting, ambient temperature, in-vehicle temperature, intake temperature, amount of sunload and ON-OFF operation of the compressor.

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

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, throttle angle, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to IPDM E/R, via CAN communication line. Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate compressor.

SELF-DIAGNOSTIC SYSTEM

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

Description of Control System INFOID:0000000001721292

The control system consists of input sensors, switches, the unified meter and A/C amp. (microcomputer) and outputs.

ATC-20

Page 36

AIR CONDITIONER CONTROL

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

The relationship of these components is shown in the figure below:

WJIA2175E

Control Operation INFOID:0000000001721293

WJIA2176E

ATC

DISPLAY SCREEN

Displays the operational status of the system.

AUTO SWITCH

• The compressor, intake doors, air mix doors, outlet doors and blower speed are automatically controlled so

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

• When pressing AUTO switch, air inlet, air outlet, fan speed, and discharge air temperature are automatically

controlled.

TEMPERATURE CONTROL DIAL (DRIVER SIDE)

ATC-21

Page 37

AIR CONDITIONER CONTROL

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

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 turned 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.

OFF SWITCH

The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet doors are set to the foot (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.

BLOWER CONTROL SWITCH

Manually control the blower speed. Seven speeds are available for manual control (as shown on the display screen).

DUAL SWITCH (WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATE CONTROL SYSTEM)

• When the DUAL switch indicator is not illuminated and the DUAL switch is pressed, the driver-side setting temperature and passenger-side setting temperature can each be set independently.

• When DUAL switch indicator is illuminated and the DUAL switch is pressed, the driver-side setting temperature is applied to both sides.

Fail-Safe Function INFOID:0000000001721294

• If a communication error exists between unified meter and A/C amp. and front air control for 30 seconds or longer, air condi tioner is controlled under following conditions:

- Compressor: ON

- Air outlet: AUTO

- Air inlet: ( ) Fresh

- Blower fan speed: AUTO

- Set temperature: Setting before communication error occurs.

Discharge Air Flow INFOID:0000000001721295

ATC-22

Page 38

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

AIR CONDITIONER CONTROL

WJIA2191E

Mode door position

Vent Foot Defroster

100% 0% —

60% 40% —

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

( ): Manually control

Air outlet/distribution

System Description INFOID:0000000001721296

SWITCHES AND THEIR CONTROL FUNCTION

ATC

WJIA1722E

ATC-23

Page 39

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

AIR CONDITIONER CONTROL

CAN Communication System Description

Refer to LAN-3.

WJIA2181E

INFOID:0000000001721297

ATC-24

Page 40

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

CONSULT-III Function (BCM) INFOID:0000000001721298

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

BCM

diagnostic test item

Inspection by part

DATA MONITOR

Display Item List

Monitor item name “operation or

unit” IGN ON SW “ON/OFF” Displays “IGN Position (ON)/OFF, ACC Position (OFF)” status as j u dged fr om i gni tion s witc h si gnal . 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 (OFF)” status as judged from air conditioner switch signal.

How to Perform Trouble Diagnosis for Quick and Accurate Repair INFOID:0000000001721299

Diagnostic mode Description

Supports inspections and adjustments. Commands are transmitted 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 Performs BCM configuration read/write functions.

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 sending drive signal to them.

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

Contents

ATC

WORK FLOW

*1 ATC-40, "Operational Check"

SYMPTOM TABLE

SHA900E

ATC-25

Page 41

TROUBLE DIAGNOSIS

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

Symptom Reference Page

ATC-42, "

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

A/C system is partially inoperativ e. 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. Discharge air temperature does not change. Air mix door motor does not operate normally. Intake door does not change. Intake door motor does not operate norm ally. 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 Insufficient Heating. Noise Go to Trouble Diagnosis Procedure for Noise. ATC-74, "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 Memory Function.

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

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.

Ground Circuit for

Front Air Control

and Unified Meter

and A/C Amp"

ATC-90, "

Control Self - Diag-

AV-133, "

Self-Diagnosis

Function" (with

NAVI) ATC-89, "

C Display (without

ATC-47, "Mode

Door Motor Cir-

ATC-50, "

Door Motor Cir-

ATC-53, " Door Motor Cir-

ATC-55, "

Motor Circuit"

ATC-61, "

Clutch Circuit"

ATC-65, "

cient Cooling"

ATC-73, "

cient Heating"

ATC-75, "

ATC-77, "

Power

Supply and

Front Air

nosis"

On Board

NAVI)"

cuit"

Air Mix

cuit"

Intake

cuit"

Blower

Magnet

Insuffi-

Self-Di-

agnosis"

Memory

Function"

Component Parts and Harness Connector Location

INFOID:0000000001721300

ENGINE COMPARTMENT

ATC-26

Page 42

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TROUBLE DIAGNOSIS

WJIA1906E

1. Refrigerant pressure senor E11 2. Radiator 3. A/C compressor F3 (view from tire housing RH)

4. Ambient sensor E1 5. Grille

ATC

PASSENGER COMPARTMENT

ATC-27

Page 43

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TROUBLE DIAGNOSIS

WJIA2182E

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

4. Unified meter and A/C amp. M49, 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) M87

5. Front air control M201 6. Intake sensor M33

ATC-28

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TROUBLE DIAGNOSIS

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< SERVICE INFORMATION >

Schematic INFOID:0000000001721301

ATC

WJWA0441E

ATC-29

Page 45

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TROUBLE DIAGNOSIS

Wiring Diagram - A/C,A -

INFOID:0000000001721302

WJWA0442E

ATC-30

Page 46

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

ATC

WJWA0443E

ATC-31

Page 47

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

WJWA0444E

ATC-32

Page 48

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

ATC

LJWA0014E

ATC-33

Page 49

< SERVICE INFORMATION >

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TROUBLE DIAGNOSIS

WJWA0445E

Unified Meter and A/C Amp. Terminal and Reference Value

Refer to DI-28, "Terminal and Reference Value for Unified Meter and A/C Amp".

INFOID:0000000001721303

A/C System Self-Diagnosis Function INFOID:0000000001721304

DESCRIPTION

ATC-34

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< SERVICE INFORMATION >

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 "FUNCTION CONFIRMATION PROCEDURE".

FUNCTION CONFIRMATION PROCEDURE

1.ENTER SELF-DIAGNOSTIC MODE

CAUTION:

• If battery voltage drops below 12V during diagnosis STEP 3, actuator speed becomes slower 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 BACK button if equipped 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.

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-90, "

Front Air Control Self - Diagnosis".

4.CHECK TO RETURN SELF-DIAGNOSIS STEP 2

Rotate the temperature control dial (driver) counterclockwise.

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

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

>> Check front air control. Refer to ATC-90, "

Front Air Control Self - Diagnosis".

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

ATC

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

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).

ATC-35

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< SERVICE INFORMATION >

>> GO TO 7.

7.CHECK ACTUATORS

Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and compressor operation.

RJIA1761E

Actuator test code no.414243444546 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 automatically controls the mode door position. Refer to the Discharge air flow table "AUXILIARY MECHANISM: DEFROST/FOOT POSITION SETTING TRIMMER".

OK or NG

OK >> GO TO 8. NG >> • Air outlet does not change.

GO TO ATC-47, "

• Intake door does not change. GO TO ATC-53, "

• Blower motor operation is malfunctioning. GO TO ATC-55, "

• Magnet clutch does not engage. GO TO ATC-61, "

• Discharge air temperature does not change. GO TO ATC-50, "

Mode Door Motor Circuit". Intake Door Motor Circuit". Blower Motor Circuit". Magnet Clutch Circuit". Air Mix Door Motor Circuit".

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

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

2. Code No. 51 appears 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 temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.

OK or NG

OK >> GO TO 10. NG >> GO TO ATC-77, "

Ambient Sensor Circuit".

10.CHECK IN-VEHICLE SENSOR

ATC-36

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< SERVICE INFORMATION >

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 temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.

OK or NG

OK >> GO TO 11. NG >> GO TO ATC-80, "

In-vehicle Sensor Circuit".

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 temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.

OK or NG

OK >> GO TO 12. NG >> GO TO ATC-85, "

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.

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

• Unified meter and A/C amp. - DISPLAY CONTROL UNIT

RJIA1762E

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.

ATC

Code No. Malfunctioning sensor (Including circuits) Reference page

21 / −21 Ambient sensor ATC-77 22 / −22 In-vehicle sensor ATC-80 24 / −24 Intake sensor ATC-85 25 / −25 Sunload sensor *1 ATC-82 26 / −26 Air mix door motor PBR (Driver) 27 / −27 Air mix door motor PBR (Passenger)

ATC-45

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

ATC-37

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< SERVICE INFORMATION >

RJIA0493E

>> Inspection End.

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 "AUXILIARY MECHANISM: DEFROST/FOOT POSITION SETTING TRIMMER".

Mode door motor ATC-47

Intake door motor ATC-53

RJIA0494E

>> Inspection End.

AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER

The trimmer compensates for differences in range of ±3°C (±6°F) between temperature setting (displayed digitally) and temperature felt by driver.

Operating procedures for this trimmer are as follows:

• Begin Self-diagnosis STEP 5 mode. Refer to "A/C System Self-diagnosis Function".

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

ATC-38

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< SERVICE INFORMATION >

• Display initially shows 61 in auxiliary mechanism. It takes approximately 3 seconds to display the temperature 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.

ATC

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).

AUXILIARY MECHANISM: DEFROST/FOOT POSITION SETTING TRIMMER

Air distribution ratio in FOOT mode can be set.

ATC-39

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< SERVICE INFORMATION >

Operating procedures for this trimmer are as follows:

• Begin Self-diagnosis STEP 5 mode. Refer to "A/C System Self-diagnosis Function".

• 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 temperature trimmer value.

• Press the mode switch as desired.

RJIA1764E

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 this trimmer are as follows:

• Begin Self-diagnosis STEP 5 mode. Refer to "A/C System Self-diagnosis Function".

• 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 memorized. (Initial setting) REC SW: ON

OFF Manual FRE status is memorized. REC SW: OFF

Setting status Setting changeover method

Operational Check INFOID:0000000001721305

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 switch.

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 switch.

If NG, go to trouble diagnosis procedure for ATC-77, " If OK, continue with next check.

Memory Function".

CHECKING BLOWER

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

blade lit.

ATC-40

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< SERVICE INFORMATION >

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 for ATC-55, " If OK, continue with next check.

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 ATC-22, "

Air Flow".

If NG, go to trouble diagnosis procedure for ATC-47, " If OK, continue with next check.

Blower Motor Circuit".

Discharge

Mode Door Motor Circuit".

CHECKING RECIRCULATION

1. Press the OFF switch.

2. Press the AUTO switch.

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

4. Listen for intake door position change (blower sound should change slightly).

If NG, go to trouble diagnosis procedure for ATC-53, " 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 for ATC-65, " If OK, continue with next check.

Insufficient Cooling".

CHECKING TEMPERATURE INCREASE

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

2. Check for hot air at discharge air outlets.

If NG, go to trouble diagnosis procedure for ATC-73, "Insufficient Heating". If OK, continue with next check.

CHECKING TEMPERATURE DECREASE

1. Press the DUAL switch (indicator ON).

2. Rotate temperature control 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-65, " If OK, continue with next check.

Insufficient Cooling".

ATC

CHECKING TEMPERATURE INCREASE

1. Rotate temperature control dial clockwise (passenger) 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-73, " If OK, continue with next check.

Insufficient Heating".

CHECK A/C SWITCH

1. Press the OFF switch.

2. Press the top of the fan switch. the fan should operate.

3. Press A/C switch.

4. A/C switch indicator will turn ON.

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

ATC-41

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< SERVICE INFORMATION >

If NG, go to trouble diagnosis procedure for ATC-61, "Magnet Clutch Circuit". If OK, continue with next check.

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-133, " C display refer to ATC-89, " If OK, continue with next check.

A/C Display (without NAVI)".

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, in-vehicle, and set temperatures.)

If NG, go to trouble diagnosis procedure for ATC-42, "

and Unified Meter and A/C Amp", then if necessary, trouble diagnosis procedure for ATC-61, "Magnet Clutch Circuit".

If all operational checks are OK (symptom cannot be duplicated), go to malfunction Simulation Tests in ATC-

25, "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-25, "

for Quick and Accurate Repair" and perform applicable trouble diagnosis procedures.

Power Supply and Ground Circuit for Front Air Control

On Board Self-Diagnosis Function". For A/

How to Perform Trouble Diagnosis

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

INFOID:0000000001721306

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE

1. Press AUTO switch.

2. Display should indicate AUTO. Confirm that the compressor clutch engages (sound or visual inspection). (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-40, " Can a symptom be duplicated

YES >> Refer to ATC-25, "How to Perform Troubl e Diagnosis for Quick and Accurate Repair". NO >> System OK.

Operational Check".

3.CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

OK >> Check power and ground circuits. Refer to "DIAGNOSTIC PROCEDURE FOR A/C SYSTEM".

COMPONENT DESCRIPTION

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

ATC-42

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< SERVICE INFORMATION >

The unified meter and A/C amp. has a built-in microcomputer which processes information 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 meter and A/C amp. is unitized with control mechanisms. 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 the front air control. It can be set at an interval 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

SYMPTOM: A/C system does not come on.

WJIA2184E

ATC

WJIA1171E

WJIA2201E

1.CHECK FRONT AIR CONTROL

Perform front air control self-diagnosis. Refer to ATC-90, " 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.

ATC-43

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< SERVICE INFORMATION >

2. Disconnect front 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.

(-) OFF ACC ON

Battery voltage

OK or NG

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

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.

WJIA2203E

OK or NG

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

Assembly".

NG >> Repair harness or connector.

WJIA2206E

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

1. Turn ignition switch 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-73

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

• If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as necessary.

(-) OFF ACC ON

Battery voltage

Ground

Battery

voltage

Battery voltage

RJIA1984E

Battery voltage

ATC-44

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< SERVICE INFORMATION >

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TROUBLE DIAGNOSIS

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

1. Turn ignition switch OFF.

2. Check continuity between unified 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-

87, "Multiplex Communication Circuit".

NG >> Repair harness or connector.

RJIA1376E

LAN System Circuit INFOID:0000000001721307

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

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-92

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

RJIA1775E

RJIA1378E

ATC

ATC-45

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< SERVICE INFORMATION >

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

M89 43 Ground

Terminal No.

(-)

Voltage

HAK0652D

OK or NG

OK >> GO TO 3. NG >> Replace unified meter and A/C amp. Refer to ATC-92

3.CHECK POWER SUPPLY FOR INOPERATIVE DOOR MOTOR

RJIA1597E

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

1 – Ground : Battery volt age

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 oscilloscope.

Terminals

Door motor

nector Mode M40 3 Air mix

(Driver) Air mix

(Passenger)

Intake M58 3

(+)

Con-

M39 3

M87 3

Terminal

No.

(-)

Ground

Voltage

HAK0652D

OK or NG

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

5.CHECK INOPERATIVE DOOR MOTOR GROUND CIRCUIT

WJIA2244E

WJIA2245E

ATC-46

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< SERVICE INFORMATION >

1. Turn ignition switch 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-

103.

• Replace intake door motor if inoperative. Refer to

ATC-103

• Replace driver side air mix door motor if inoperative. Refer to ATC-104, "

tion".

• Replace passenger side air mix door motor if inoperative. Refer to ATC-104, "

Installation".

NG >> Repair harness or connector.

Removal and Installa-

WJIA2246E

Removal and

Mode Door Motor Circuit INFOID:0000000001721308

SYMPTOM:

• Air outlet does not change.

• Mode door motor does not operate normally.

INSPECTION FLOW

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 ATC-22, "

Air Flow".

Can a symptom be duplicated?

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

Discharge

2.PERFORM COMPLETE OPERATIONAL CHECK

ATC

Perform a complete operational check and check for any symptoms. Refer to ATC-40, " Can a symptom be duplicated?

YES >>Refer to ATC-25, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". 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-90, " OK or NG

OK >> GO TO 5. NG >> Perform power and ground circuit for front air control. Refer to ATC-42, "

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

Front Air Control Self - Diagnosis".

Power Supply and

5.PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-34, "

A/C System Self-Diagnosis Function".

ATC-47

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< SERVICE INFORMATION >

OK or NG

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

6.PERFORM SELF-DIAGNOSIS STEP - 3

Perform self-diagnosis STEP - 3. Refer toATC-34, " OK or NG

OK >> GO TO 7. NG >> Perform diagnostic procedure for LAN system circuit. Refer to ATC-45, "

A/C System Self-Diagnosis Function".

LAN System Circuit".

7.PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4 to check mode door control. Refer to ATC-34, "

Function".

OK or NG

OK >> GO TO 8. NG >> Check and repair mode door motor linkage. Refer to ATC-103

A/C System Self-Diagnosis

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

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-77, " 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-80, " 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-82, " 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-85, " 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-50, " OK or NG

OK >> If the symptom still exists, perform a complete operational check. Refer to ATC-40, "Operational

Check". If no other symptom exists replace unified meter and A/C amp. Refer to ATC-92.

NG >> Repair as necessary.

SYSTEM DESCRIPTION

Component Parts

Mode door control system components 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

Air Mix Door Motor Circuit".

ATC-48

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< SERVICE INFORMATION >

• Sunload sensor

• Intake sensor

System Operation

The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp. sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU. The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the unified meter and A/C amp.

Mode Door Control Specification

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 meter and A/C amp. Motor rotation is conveyed to a link which activates the mode door.

WJIA2217E

ATC

WJIA0363E

WJIA0316E

DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR

SYMPTOM: Mode door motor does not operate normally. Perform diagnostic procedure for LAN circuit. Refer to ATC-45, "

ATC-49

LAN System Circuit".

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TROUBLE DIAGNOSIS

Air Mix Door Motor Circuit

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

INSPECTION FLOW

INFOID:0000000001721309

1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

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

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 displayed.

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-40, " Can a symptom be duplicated?

YES >> Refer to ATC-25, "How to Perform Troubl e Diagnosis for Quick and Accurate Repair". NO >> System OK.

Operational Check".

4.CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 5.

5.PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

Perform front air control self-diagnosis. Refer to ATC-90, " OK or NG

OK >> GO TO 6. NG >> Perform power and ground circuit for front air control. Refer to ATC-42, "

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

Front Air Control Self - Diagnosis".

Power Supply and

6.PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-34, " OK or NG

OK >> GO TO 7. OK >> Perform appropriate malfunctioning sensor circuit.

A/C System Self-Diagnosis Function".

7.PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-34, " OK and NG

OK >> GO TO 8. NG >> Check LAN system circuit. Refer to ATC-45, "

A/C System Self-Diagnosis Function".

LAN System Circuit".

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

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-77, " OK or NG

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

ATC-50

Ambient Sensor Circuit".

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< SERVICE INFORMATION >

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TROUBLE DIAGNOSIS

9.CHECK IN-VEHICLE SENSOR CIRCUIT

Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to ATC-80, " 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-82, " OK or NG

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

Sunload Sensor Circuit".

11.CHECK INTAKE SENSOR CIRCUIT

Perform diagnostic procedure for the intake sensor circuit. Refer to ATC-85, " 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 "Air Mix Door Motor Circuit". OK or NG

OK >> If the symptom still exists, perform a complete operational check. Refer to ATC-40, "Operational

Check" and check for other symptoms. Refer to ATC-25, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". If no other symptom exists, replace unified meter and A/C amp.

Refer to ATC-92

NG >> Repair as necessary.

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 and A/C amp. receives data from each of the sensors. The unified meter and A/C amp. sends air mix door, mode door and int ake door motor opening angle dat a to the air mix door motor LCU, mode door motor LCU and intake door motor LCU. The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening

ATC

ATC-51

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< SERVICE INFORMATION >

angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the unified meter and A/C amp.

WJIA2216E

Air Mix Door Control Specification

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 rotation is then conveyed through a shaft and the air mix door position is then fed back to the unified meter and A/C amp. by PBR built-in air mix door motor.

RJIA1782E

WJIA0319E

WJIA0320E

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR

Perform diagnostic procedure for LAN circuit. Refer to ATC-45, "LAN System Circuit".

ATC-52

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< SERVICE INFORMATION >

Air Mix Door Motor PBR Circuit INFOID:0000000001721310

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-45, "LAN System Circuit".

Intake Door Motor Circuit INFOID:0000000001721311

SYMPTOM:

• Intake door does not change.

• Intake door motor does not operate normally.

INSPECTION FLOW

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 (blower sound should change 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-40, " Can a symptom be duplicated?

YES >>Refer to ATC-25, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK.

Operational Check".

3.CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

ATC

>> GO TO 4.

4.PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

Perform front air control self-diagnosis. Refer to ATC-90, " OK or NG

OK >> GO TO 5. NG >> Perform power and ground circuit for front air control. Refer to ATC-42, "

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

Front Air Control Self - Diagnosis".

Power Supply and

5.PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-34, " OK or NG

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

A/C System Self-Diagnosis Function".

6.PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-34, " OK and NG

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

A/C System Self-Diagnosis Function".

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

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-77, "

ATC-53

Ambient Sensor Circuit".

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< SERVICE INFORMATION >

OK or NG

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

8.CHECK IN-VEHICLE SENSOR CIRCUIT

Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to ATC-80, " OK or NG

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

In-vehicle Sensor Circuit".

9.CHECK SUNLOAD SENSOR CIRCUIT

Perform diagnostic procedure for the sunload sensor circuit. Refer to ATC-82, " OK or NG

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

Sunload Sensor Circuit".

10.CHECK INTAKE SENSOR CIRCUIT

Perform diagnostic procedure for the intake sensor circuit. Refer to ATC-85, " OK or NG

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

Intake Sensor Circuit".

11.CHECK AIR MIX DOOR MOTOR PBR CIRCUIT

Perform diagnostic procedure for the air mix door motor circuit. Refer to ATC-50, " OK or NG

OK >> If the symptom still exists, perform a complete operational check. Refer to ATC-40, "Operational

Check" and check for other symptoms. Refer to ATC-25, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". If no other symptoms exists replace unified meter and A/C amp.

Refer to ATC-92

NG >> Repair as necessary.

Air Mix Door Motor Circuit".

12.CHECK INTAKE DOOR CONTROL LINKAGE

Check intake door control linkage. Refer toATC-99 OK or NG

OK >> Check LAN system circuit. Refer to ATC-45, "LAN System Circuit". NG >> Repair or adjust control linkage.

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 motor)

• In-vehicle sensor

• Ambient sensor

• Sunload sensor

• Intake sensor

• Front air control

System Operation

ATC-54

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< SERVICE INFORMATION >

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 OFF switches are pushed or A/C switch is OFF, the unified meter and A/C amp. sets the intake door at the FRESH position.

WJIA2212E

Intake Door Control Specification

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.

WJIA0359E

ATC

RJIA1788E

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

SYMPTOM: Intake door motor does not operate normally. Perform diagnostic procedure for LAN system circuit. Refer to ATC-45, "

LAN System Circuit".

Blower Motor Circuit INFOID:0000000001721312

SYMPTOM:

• Blower motor operation is malfunctioning.

INSPECTION FLOW

1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER

ATC-55

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< SERVICE INFORMATION >

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-40, " Can a symptom be duplicated?

YES >> Refer to ATC-25, "How to Perform Troubl e Diagnosis for Quick and Accurate Repair". 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-90, " OK or NG

OK >> GO TO 5. NG >> Perform power and ground circuit for front air control. Refer to ATC-42, "

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

Front Air Control Self - Diagnosis".

Power Supply and

5.PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-34, " OK or NG

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

A/C System Self-Diagnosis Function".

6.PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-34, "

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 according to each code No.?

YES >> GO TO 7. NO >> Check blower motor circuit. Refer to "DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR".

A/C System Self-Diagnosis Function".

7.CHECK ENGINE COOLANT TEMPERATURE

Check engine coolant temperature. Is engine coolant temperature below 56

YES >> GO TO 8. NO >> Blower motor operation is normal.

°C (133°F)?

8.CHECK BLOWER MOTOR SPEED

Check blower motor speed. Is blower motor operating under starting blower speed control?

YES >> GO TO 9. NO >> Check blower motor circuit. Refer to "DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR".

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

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-77, " OK or NG

OK >> GO TO 10.

Ambient Sensor Circuit".

ATC-56

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< SERVICE INFORMATION >

NG >> Repair as necessary.

10.CHECK IN-VEHICLE SENSOR CIRCUIT

Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to ATC-80, " 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-82, " 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-85, " OK or NG

OK >> If the symptom still exists, perform a complete operational check and check for other symptoms.

Refer to ATC-40, "

Perform Trouble Diagnosis for Quick and Accurate Repair". If no other symptom exists replace

unified meter and A/C amp. Refer to ATC-92

NG >> Repair as necessary.

Operational Check". and check for other symptoms. Refer to ATC-25, "How to

SYSTEM DESCRIPTION

Component Parts

Fan speed control system components are:

• Unified meter and A/C amp.

• In-vehicle sensor

• Ambient sensor

• Sunload sensor

• Intake sensor

• Fan control amp.

• Front air control

System Operation

Intake Sensor Circuit".

ATC

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 flow is increased, the duty ratio of the blower fan motor′s drive signal is changed at 8%/sec. to prevent a sudden increase in air flow.

ATC-57

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TROUBLE DIAGNOSIS

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< SERVICE INFORMATION >

In addition to manual 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.

St arting Blower Speed Co ntrol

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.

Start Up From Usual or HOT SOAK Condition (Automatic mode) The blower will begin operation momentarily after the AUTO swi tch is pushed. The bl ower speed will gradual ly rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective blower speed).

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 Cont rol Specification

COMPONENT DESCRIPTION

Fan Control Amp.

The fan control amplifier is located on the cooling unit. 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.).

RJIA1996E

WJIA0049E

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR

ATC-58

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TROUBLE DIAGNOSIS

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< SERVICE INFORMATION >

SYMPTOM: Blower motor operation is malfunctioning under starting fan speed control.

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.

WJIA2215E

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 motor relay. Refer to PG-5, "

Wiring Diagram - POWER -"

• 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

Check blower motor. Refer to "Front Blower Motor". OK or NG

OK >> GO TO 3. NG >> Replace blower motor. Refer to ATC-98

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

WJIA0056E

ATC

Terminals

Connector - Terminal Connector

M62-2 M64-3 Yes

OK or NG

Continuity

WJIA0857E

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

4.CHECK VOLTAGE FOR FAN CONTROL AMP.

ATC-59

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TROUBLE DIAGNOSIS

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< SERVICE INFORMATION >

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 switch OFF.

2. Disconnect unified meter and A/C amp.

3. Check continuity between unified 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.

WJIA2241E

NG >> Repair harness or connector.

6.CHECK BODY GROUND CIRCUIT FOR FAN CONTROL AMP.

Check continuity between fan control amp. harness connector M64 terminal 1 and ground.

Terminals Continuity

Connector - Terminal

M64-1

Body ground Yes

OK or NG

OK >> 1. Replace fan control amp. Refer to ATC-105.

2. Confirm that blower motor operation is normal.

NG >> Repair harness or connector.

WJIA0856E

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 and unified meter and A/C amp. harness connector M89 terminal 60.

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-92, "Removal and Installation".

Yes

WJIA1180E

ATC-60

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TROUBLE DIAGNOSIS

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< SERVICE INFORMATION >

2. Confirm that blower motor operation 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.

WJIA2240E

Magnet Clutch Circuit INFOID:0000000001721313

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 operational check for any symptoms. Refer to ATC-40, " Does another symptom exist?

YES >>Refer to ATC-25, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK.

Operational Check".

3.CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

ATC

>> GO TO 4.

4.PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

Perform front air control self-diagnosis. Refer to ATC-90, " OK or NG

OK >> GO TO 5. NG >> Perform power and ground circuit for front air control. Refer to ATC-42, "

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

Front Air Control Self - Diagnosis".

Power Supply and

5.PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-34, " OK or NG

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

A/C System Self-Diagnosis Function".

ATC-61

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TROUBLE DIAGNOSIS

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< SERVICE INFORMATION >

6.PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-34, " OK and NG

OK >> GO TO 7. NG >> Check for refrigerant pressure. Refer to ATC-65, "

A/C System Self-Diagnosis Function".

Insufficient Cooling"

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

Perform diagnostic procedure for the ambient sensor circuit. Refer to ATC-77, " OK or NG

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

Ambient Sensor Circuit".

8.CHECK INTAKE SENSOR CIRCUIT

Perform diagnostic procedure for the intake sensor circuit. Refer to ATC-85, " OK or NG

OK >> If the symptom still exists, perform a complete operational check. Refer to ATC-40, "Operational

Check" and check for other symptoms. Refer to ATC-25, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". If no other symptom exists replace unified meter and A/C amp. Refer

to ATC-92

NG >> Repair as necessary.

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 temperature is lower than 2.5°C (37°F).

Intake Sensor Circuit".

RHA094GD

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

WJIA1175E

ATC-62

Page 78

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

1.CHECK INTAKE SENSOR CIRCUIT

Check intake sensor. Refer to ATC-34, " OK or NG

OK >> GO TO 2. NG >> Malfunctioning intake sensor. Refer to ATC-85, "

A/C System Self-Diagnosis Function".

Intake Sensor Circuit".

2.PERFORM AUTO ACTIVE TEST

Refer to PG-21, " Does magnet clutch operate?

YES or NO

YES >>• WITH CONSULT-III

NO >> Check 10A fuse (No. 33, located in IPDM E/R), and GO TO 3.

Auto Active Test".

GO TO 5.

• WITHOUT CONSULT-III GO TO 6.

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 operation sound when applying battery voltage direct current to terminal.

OK or NG

OK >> Replace IPDM E/R. Refer to PG-29, "Removal and

Installation of IPDM E/R".

NG >> Replace magnet clutch. Refer to ATC-112, "

and Installation for Compressor Clutch".

Removal

5.CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

Check compressor ON/OFF signal. Refer to ATC-25, "

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-III Function (BCM)".

6.CHECK CIRCUIT CONTINUITY BETWEEN BCM AND UNIFIED METER AND A/C AMP.

WJIA0331E

SJIA0197E

ATC

ATC-63

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< SERVICE INFORMATION >

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 terminal 27 and unified meter and A/C amp. harness connector M89 terminal 42.

27 – 42 : Continuity should exist.

OK or NG

OK >> GO TO 7. NG >> Repair harness or connector.

WJIA0332E

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

Voltage

(Approx.)

RJIA1446E

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-92

NG-2 >> If the voltage is approx. 0V when A/C switch is OFF: Replace BCM. Refer to BCS-18, "

BCM".

8.CHECK REFRIGERANT PRESSURE SENSOR

WITH CONSULT-III

1. Start engine.

2. Check voltage of refrigerant pressure sensor. Refer to ATC-25, "

CONSULT-III Functi on (BCM)".

WITHOUT CONSULT-III

1. Start engine.

2. Check voltage between ECM harness connector F54 terminal 70 and ground.

Terminals

(+)

ECM connector Terminal No.

F54 70 Ground A/C switch: ON 3.60 - 3.88V

(-)

Condition

Voltage

(Approx.)

OK or NG

OK >> • WITH CONSULT-III

GO TO 9.

• WITHOUT CONSULT-III GO TO 10.

NG >> Refer to EC-568

9.CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to ATC-25, "

CONSULT-III Function (BCM)".

ATC-64

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TROUBLE DIAGNOSIS

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.

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)

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.

WJIA2247E

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

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-

92.

NG-2 >> If the voltage is approx. 0V when blower motor is OFF: Replace BCM. Refer to BCS-18, "

BCM".

12.CHECK CAN COMMUNICATION

Check CAN communication. Refer to LAN-38

•BCM – ECM

• ECM – IPDM E/R

• ECM – Unified meter and A/C amp.

OK or NG

OK >> Inspection End NG >> Repair or replace malfunctioning part(s).

ATC

Insufficient Cooling INFOID:0000000001721314

SYMPTOM: Insufficient cooling

INSPECTION FLOW

ATC-65

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TROUBLE DIAGNOSIS

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< SERVICE INFORMATION >

1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1. Press the AUTO switch.

2. Turn temperature control 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.

2.CHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Refer to ATC-40, " Does another symptom exist?

YES >> Refer to ATC-25, "How to Perform Troubl e Diagnosis for Quick and Accurate Repair". 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-90, " OK or NG

OK >> GO TO 5. NG >> Perform power and ground circuit for front air control. Refer to ATC-42, "

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

Front Air Control Self - Diagnosis".

Power Supply and

5.PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-34, " OK or NG

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

A/C System Self-Diagnosis Function".

6.PERFORM SELF-DIAGNOSIS STEP - 4

Perform self-diagnosis STEP - 4. Refer to ATC-34, " OK and NG

OK >> GO TO 7. NG >> • Check Magnet clutch mechanism. Refer to ATC-61, "

• Check LAN system circuit. Refer to ATC-45, "

• Check blower motor circuit. Refer to ATC-55, "

A/C System Self-Diagnosis Function".

Magnet Clutch Circuit".

LAN System Circuit".

Blower Motor Circuit".

7.CHECK COMPRESSOR DRIVE BELT TENSION

Check compressor belt tension. Refer to EM-13, " OK or NG

OK >> GO TO 8. NG >> Adjust or replace compressor belt. Refer to EM-13, "

Checking Drive Belts".

Adjusting Drive Belts".

8.CHECK AIR MIX DOOR OPERATION

Check and verify air mix door operation. Refer to ATC-50, " Does air mix door operate correctly?

YES >> GO TO 9. NO >> Repair or replace air mix door control linkage.

Air Mix Door Motor Circuit".

9.CHECK COOLING F AN MO TOR OPERATION

Check and verify cooling fan motor for smooth operation. Refer to EC-433, " Does cooling fan motor operate correctly?

YES >> GO TO 10.

Description".

ATC-66

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TROUBLE DIAGNOSIS

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< SERVICE INFORMATION >

NO >> Check cooling fan motor. Refer to EC-433.

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 ATC-3, "

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 ATC-3, "

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 "PERFORMANCE TEST DIAGNOSES". NO >> GO TO 14.

14.CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Refer to "Test Reading". OK or NG

OK >> GO TO 15. NG >> Perform performance test diagnoses. Refer to "PERFORMANCE TEST DIAGNOSES".

15.CHECK AIR DUCTS

Check ducts for air leaks. OK or NG

OK >> Perform temperature setting trimmer procedure. Refer to ATC-34, "A/C System Self-Diagnosis

Function".

NG >> Repair air leaks.

PERFORMANCE TEST DIAGNOSES

ATC

ATC-67

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TROUBLE DIAGNOSIS

WJIA2248E

*1 "PERFORMANCE CHART" *2 ATC-50, " Air Mix Door Motor Circuit" *3 "Trouble Diagnoses for UNUSUAL

Pressure"

ATC-68

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Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

ATC

WJIA0361E

*1 ATC-112, "Removal and Installation

for Compressor Clutch"

*2 ATC-55, "Blower Motor Circuit" *3 EM-13, "Checking Drive Belts"

PERFORMANCE CHART

Test Condition

Testing must be performed as follows:

ATC-69

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TROUBLE DIAGNOSIS

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< SERVICE INFORMATION >

Vehicle location Indoors or in the shade (in a well-ventilated place) Doors Closed Door window Open Hood Open TEMP. Max. COLD Mode switch

Recirculation (REC) switch (Recirculation) set

Fan (blower) speed Engine speed Idle speed Operate the air conditioning system for 10 minutes before taking measurements.

Test Reading

Recirculating-to-discharge Air Temperature Table

(Ventilation) set

Max. speed set

Inside air (Recirculating air) at blower assembly inlet

Relative humidity

50 - 60

60 - 70

Air temperature

°C (°F) 20 (68) 5.3 - 6.5 (42 - 44) 25 (77) 9.7 - 11.5 (49 - 53) 30 (86) 13.8 - 16.3 (57 - 61) 35 (95) 18.0 - 21.2 (64 - 70)

40 (104) 22.2 - 25.7 (72 - 78)

20 (68) 6.5 - 7.7 (44 - 46) 25 (77) 11.5 - 13.3 (53 - 56) 30 (86) 16.3 - 18.8 (61 - 66) 35 (95) 21.2 - 24.0 (70 - 75)

40 (104) 25.7 - 29.2 (78 - 85)

Ambient Air Temperature-to-operating Pressure Table

Relative humidity

50 - 70

Ambient air

Air temperature

°C (°F) 20 (68)

25 (77)

30 (86)

35 (95)

40 (104)

High-pressure (Discharge side)

(6.94 - 8.57, 98.6 - 121.8)

(8.16 - 10.05, 116.0 - 142.8)

(9.59 - 11.73, 136.3 - 166.8)

(11.83 - 14.38, 168.2 - 204.5)

(13.52 - 16.52, 192.1 - 234.9)

kPa (kg/cm

680 - 840

800 - 985

940 - 1,150

1,160 - 1,410

1,325 - 1,620

Discharge air temperature at center ventilator

°C (°F)

, psi)

Low-pressure (Suction side)

kPa (kg/cm2, psi)

160 - 198

(1.63 - 2.02, 23.2 - 28.7)

198 - 245

(2.02 - 2.50, 28.7 - 35.5)

225 - 278

(2.30 - 2.84, 32.6 - 40.3)

273 - 335

(2.78 - 3.42, 39.6 - 48.6)

325 - 398

(3.32 - 4.06, 47.1 - 57.7)

Trouble Diagnoses for Unusual Pressure

Whenever system′s high and/or low side pressure is unusual, diagnose using a manifold gauge. The marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperatureto-operating pressure table).

Both High- and Low-pressure Sides are Too High

ATC-70

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Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

Gauge indication Refrigerant cycle Probable cause Correctiv e action

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

AC359A

Pressure is reduced soon after water is splashed on condenser.

Air suction by cooling fan is insufficient.

• Low-pressure pipe is not cold.

• When compressor is stopped high-pressure value quickly drops by ap prox-

imately 196 kPa (2 kg/cm 28 psi). It then decreases gradually thereafter.

Engine tends to overheat.

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

• Plates are sometimes covered with frost.

Excessive refrigerant char ge in refrigeration cycle

Insufficient condenser cooling performance

↓

1. Condenser fins are clogged.

2. Improper fan rotation of cooling fan

Poor heat exchange in condenser (After compressor operation stops, high-pressure decreases too slowly.)

↓

Air in refrigeration cycle

Engine cooling systems malfunction.

• Excessive liquid refrigerant

on low-pressure side

• Excessive refrigerant dis-

charge flow

• Expansion valve is open a lit-

tle compared with the speci-

fication. ↓ Improper expansion valve adjustment

Reduce refrigerant until specified pressure is obtained.

• Clean condenser.

• Check and repair cooling fan as necessary.

Evacuate and recharge system.

Check and repair engine cooling system.

Replace expansion valve.

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

Gauge indication Refrigerant cycle Probable cause Corrective action

High-pressure side is too high a nd low-pressure side is too low.

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

AC360A

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

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

Gauge indication Refrigerant cycle Probable cause Corrective action

High-pressure side is too low and low-pressure side is too high.

AC356A

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

No temperature difference between high- and low-pressure sides

Compressor pressure operation is improper.

↓

Damaged inside compressor packings

Compressor pressure operation is improper.

↓

Damaged inside compressor packings.

• Check and repair or replace malfunctioning parts.

• Check oil for contamination.

Replace compressor.

ATC

Both High- and Low-pressure Sides are Too Low

ATC-71

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< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

Gauge indication Refrigerant cycle Probable cause Corrective action

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

AC353A

TROUBLE DIAGNOSIS

• There is a big temperature difference between liquid tank outlet and inlet. Outlet temperature is extremely low.

• Liquid tank inlet and expansion valve are frosted.

• Temperature of exp ansion valve inlet is extremely low as compared with areas near liquid tank.

• Expansion valve inlet may be frosted.

• Temperature difference occurs somewhere in highpressure side.

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

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

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

Air flow volume is not enough or is too low.

Liquid tank inside is slightly clogged.

High-pressure pipe located between liquid tank and expansion valve is clogged.

Low refrigerant charge

↓

Leaking fittings or components Expansion valve closes a little

compared with the specification.

↓

1. Improper expansion valve adjustment

2. Malfunctioning expansion valve

3. Outlet and inlet may be clogged.

Low-pressure pipe is clogged or crushed.

Evaporator is frozen.

• Replace liquid tank.

• Check oil for contamination.

• Check and repair malfunctioning parts.

• Check oil for contamination.

Check refrigerant for leaks. Refer to ATC-119, "

of Refrigerant Leaks".

• Remove foreign particle s by using compressed air.

• Check oil for contamination.

• Check and repair malfunctioning parts.

• Check oil for contamination.

• Check intake sensor circuit. Refer to ATC-85, "

Sensor Circuit".

• Replace compressor.

Checking

Intake

Low-pressure Side Sometimes Becomes Negative

Gauge indication Refrigerant cycle Probable cause Corrective action

Low-pressure side sometimes becomes negative.

AC354A

• Air conditioning system does not function and does not cyclically cool the compartment air.

• The system constantly functions for a certain period of time after compressor is stopped and restarted.

Refrigerant does not discha rge cyclically.

↓

Moisture is frozen at expansion valve outlet and inlet.

↓

Water is mixed with refrigerant.

• Drain water from refrigerant or replace refrigerant.

• Replace liquid tank.

Low-pressure Side Becomes Negative

ATC-72

Page 88

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

Gauge indication Refrigerant cycle Probable cause Corrective action

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

• If water is the cause, initially

Low-pressure side becom es nega tive.

AC362A

Liquid tank or front/rear side of expansion valve′s pipe is frosted or dewed.

High-pressure side is closed and refrigerant does not flow.

↓

Expansion valve or liquid tank is frosted.

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

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

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

• Replace liquid tank.

• Check oil for contamination.

Insufficient Heating INFOID:0000000001721315

SYMPTOM: Insufficient heating

INSPECTION FLOW

1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Press the AUTO switch.

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

3. Check for hot air at discharge air outlets. Can this symptom be duplicated?

YES >>GO TO 2. NO >> Perform complete system operational check. Refer to ATC-40, "

Operational Check".

2.CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 3.

3.PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

Perform front air control self-diagnosis. Refer to ATC-90, " OK or NG

OK >> GO TO 4. NG >> Perform power and ground circuit for front air control. Refer to ATC-42, "

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

Front Air Control Self - Diagnosis".

Power Supply and

4.PERFORM SELF-DIAGNOSIS STEP - 2

Perform self-diagnosis STEP - 2. Refer to ATC-34, " OK or NG

OK >> GO TO 5. NG >> Perform appropriate malfunctioning sensor circuit.

A/C System Self-Diagnosis Function".

5.PERFORM SELF-DIAGNOSIS STEP - 4

ATC

Perform self-diagnosis STEP - 4. Refer to ATC-34, "

A/C System Self-Diagnosis Function".

OK and NG

OK >> GO TO 6.

ATC-73

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TROUBLE DIAGNOSIS

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

NG >> • Check LAN system circuit. Refer to ATC-45, "LAN System Circuit".

• Check blower motor circuit. Refer to ATC-55, "

Blower Motor Circuit".

6.CHECK ENGINE COOLING SYSTEM

1. Check for proper engine coolant level. Refer to CO-9, "

2. Check hoses for leaks or kinks.

3. Check radiator cap. Refer to CO-9, "

4. Check for air in cooling system. OK or NG

OK >> GO TO 7. NG >> Repair as necessary.

System Inspection".

7.CHECK AIR MIX DOOR OPERATION

Check the operation of the air mix door. OK or NG

OK >> GO TO 8. NG >> Check the air mix door motor circuit. Refer to ATC-50, "

8.CHECK AIR DUCTS

Check for disconnected or leaking air ducts. OK or NG

OK >> GO TO 9. NG >> Repair all disconnected or leaking air ducts.

9.CHECK HEATER HOSE TEMPERATURES

1. Start engine and warm it up to normal operating temperature.

2. Touch both the inlet and outlet heater hoses. OK or NG

OK >> Hot inlet hose and a warm outlet hose: GO TO 10. NG >> Both hoses warm: GO TO 11.

10.CHECK ENGINE COOLANT SYSTEM

Air Mix Door Motor Circuit".

Check engine control temperature sensor. Refer to EC-186 OK or NG

OK >> System OK. NG >> Repair or replace as necessary. Retest.

11.CHECK HEATER HOSES

Check heater hoses for proper installation. OK or NG

OK >> System OK. NG >> 1. Back flush heater core.

2. Drain the water from the system.

3. Refill system with new engine coolant. Refer to CO-10, "

4. GO TO 12 to retest.

Changing Engine Coolant".

12.CHECK HEATER HOSE TEMPERATURES

1. Start engine and warm it up to normal operating temperature.

2. Touch both the inlet and outlet heater hoses. OK or NG

OK >> System OK. NG >> Replace heater core. Refer to ATC-102

Noise INFOID:0000000001721316

SYMPTOM: Noise

INSPECTION FLOW

ATC-74

Page 90

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

*1 ATC-112, "Removal and Installation

for Compressor Clutch"

*4 ATC-40, "Operational Check" *5 EM-13, "Checking Drive Belts"

*2 ATC-112, "Removal and Installation

for Compressor Clutch"

RJIA1596E

*3 ATC-16, "Maintenance of Oil Quanti-

ty in Compressor"

ATC

Self-Diagnosis INFOID:0000000001721317

SYMPTOM: Self-diagnosis cannot be performed.

INSPECTION FLOW

1.CONFIRM AUTO MODE OPERATION

ATC-75

Page 91

TROUBLE DIAGNOSIS

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

1. Press the AUTO switch.

2. Display should indicate AUTO. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower speed will depend on ambient, in-vehicle and set temperatures.)

OK or NG

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

2.PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to ATC-40, " Can a symptom be duplicated?

YES >> Refer to ATC-25, "How to Perform Troubl e Diagnosis for Quick and Accurate Repair". NO >> System OK.

Operational Check".

3.CHECK FOR SERVICE BULLETINS

Check for any service bulletins. Have any service bulletins been issued?

YES >> Refer to appropriate service bulletin. NO >> GO TO 4.

4.PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS

Perform front air control self-diagnosis. Refer to ATC-90, " OK or NG

OK >> GO TO 5. NG >> Perform power and ground circuit for front air control. Refer to ATC-42, "

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

Front Air Control Self - Diagnosis".

Power Supply and

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

Check unified meter and A/C amp. main power supply and ground circuit. Refer to ATC-42, "

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

OK or NG

OK >> GO TO 6. NG >> Repair as necessary.

Power Supply

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

Check ambient sensor circuit. Refer to ATC-77, " OK or NG

OK >> GO TO 7. NG >> Repair or replace as necessary.

7.CHECK IN-VEHICLE SENSOR CIRCUIT

Check in-vehicle sensor circuit. Refer to ATC-80, " OK or NG

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

8.CHECK SUNLOAD SENSOR CIRCUIT

Check sunload sensor circuit. Refer to A TC-82, " OK or NG

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

Sunload Sensor Circuit".

9.CHECK INTAKE SENSOR CIRCUIT

Check intake sensor circuit. Refer to ATC-85, " OK or NG

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

Intake Sensor Circuit".

Ambient Sensor Circuit".

In-vehicle Sensor Circuit".

ATC-76

Page 92

< SERVICE INFORMATION >

Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

10.CHECK AIR MIX DOOR MOTORS PBR CIRCUIT

Check air mix door motors PBR circuit. Refer to ATC-50, " OK or NG

OK >> If the symptom still exists, perform a complete operational check. Refer to ATC-40, "Operational

Check" and check for other symptoms. Refer to ATC-25, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". If no other symptom exists replace unified meter and A/C amp. Refer

to ATC-92

NG >> Repair or replace as necessary.

Memory Function INFOID:0000000001721318

SYMPTOM: Memory function does not operate.

INSPECTION FLOW

Air Mix Door Motor Circuit".

1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MEMORY FUNCTION

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

2. Press the OFF switch.

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 switch. 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-40, " Can a symptom be duplicated?

YES >>Refer to ATC-25, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK.

Operational Check".

3.CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

ATC

OK >> GO TO 4.

4.CHECK POWER AND GROUND CIRCUIT

Check main power supply and ground circuit. Refer to ATC-42, "

Control and Unified Meter and A/C Amp".

OK or NG

OK >> 1. Replace the unified meter and A/C amp. Refer to ATC-92

2. Perform self-diagnosis STEP - 2 to confirm that code No. 20 is displayed. Refer to ATC-34,

"A/C System Self-Diagnosis Function".

NG >> Repair as necessary.

Ambient Sensor Circuit INFOID:0000000001721319

COMPONENT DESCRIPTION

Ambient Sensor

ATC-77

Power Supply and Ground Circuit for Front Air

Page 93

TROUBLE DIAGNOSIS

Revision: July 2007 2008 Maxima

< SERVICE INFORMATION >

The ambient sensor (1) is attached on the front bumer reinforcement (left side). It detects ambient temperature and converts it into a resistance value which is then input into the unified meter and A/C amp.

WJIA2188E

AMBIENT TEMPERA TURE INPUT PROCESS

The unified meter and A/C amp. includes a processing circuit for the ambient sensor input. However, when the temperature detected by the ambient sensor increases quickly, the processi ng ci rcuit retards the unified meter and A/C amp. function. It only allows the unified meter and A/C amp. to recognize an ambient temperature increase of 0.33°C (0.6°F) per 100 seconds. As an example, consider stopping for a cup of coffee after high speed driving. Although the actual ambient temperature has not changed, the temperature detected by the ambient sensor will increase. This is because the heat from the engine compartment can radiate to the front grille area, location of the ambient sensor.

DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR

SYMPTOM: Ambient sensor circuit is open or shorted. (21 or − 21 is indicated on unified meter and A/C amp. As a result of conducting Self-diagnosis STEP-2.)

RJIA1461E

1.CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND

1. Turn ignition switch OFF.

2. Disconnect ambient sensor connector.

3. Turn ignition switch ON.

4. Check voltage between ambient sensor harness connector E1 terminal 1 and ground.

1 – Ground : Approx. 5V

OK or NG

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

RJIA0244E

2.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND UNIFIED METER AND A/C AMP.

ATC-78

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< SERVICE INFORMATION >

1. Turn ignition switch OFF.

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

3. Check continuity between ambient sensor harness connector E1 terminal 2 and unified meter and A/C amp. harness connector M89 terminal 49.

2 – 49 : Continuity should exist.

OK or NG

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

RJIA1450E

3.CHECK AMBIENT SENSOR

Refer to "Ambient Sensor". OK or NG

OK >> 1. Replace unified meter and A/C amp. Refer to ATC-92.

2. GO TO ATC-34, " Confirm that code No. 20 is displayed.

NG >> 1. Replace ambient sensor. Refer to ATC-93

2. GO TO ATC-34, " Confirm that code No. 20 is displayed.

A/C System Self-Diagnosis Function" and perform self-diagnosis STEP-2.

4.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR 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 ambient sensor harness connector E1 terminal 1 and unified meter and A/C amp. harness connector M89 terminal 39.

1 – 39 : Continuity should exist.

4. Check continuity between ambient sensor harness connector E1 terminal 1 and ground.

ATC

1 – Ground : Continuity should not exist.

OK or NG

OK >> 1. Replace unified meter and A/C amp. Refer to ATC-92.

2. GO TO ATC-34, " Confirm that code No. 20 is displayed.

NG >> Repair harness or connector.

A/C System Self-Diagnosis Function" and perform self-diagnosis STEP -2.

COMPONENT INSPECTION

Ambient Sensor

RJIA1451E

ATC-79

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< SERVICE INFORMATION >

After disconnecting ambient sensor connector (1), measure resistance between terminals 2 and 1 at sensor harness side, using the table below.

Temperature °C (°F) Resistance kΩ

−15 (5) 12.73

−10 (14) 9.92

−5 (23) 7.80

0 (32) 6.19

5 (41) 4.95 10 (50) 3.99 15 (59) 3.24 20 (68) 2.65 25 (77) 2.19 30 (86) 1.81 35 (95) 1.51

40 (104) 1.27 45 (113) 1.07

If NG, replace ambient sensor. Refer to ATC-93

WJIA1909E

In-vehicle Sensor Circuit INFOID:0000000001721320

COMPONENT DESCRIPTION

In-vehicle Sensor

The in-vehicle sensor is located on the lower driver instrument panel. It converts variations in temperature of compartment air drawn from the aspirator into a resistance value. It is then input into the unified meter and A/C amp.

RJIA1802E

Aspirator

The aspirator is located on driver′s side of heater and cooling unit assembly. It produces vacuum pressure due to air discharged from the heater and cooling unit assembly, continuously taking compartment air in the aspirator.

RJIA1803E

ATC-80

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Revision: July 2007 2008 Maxima

TROUBLE DIAGNOSIS

DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR

SYMPTOM: In-vehicle sensor circuit is open or shorted. (22 or −22 is indicated on unified meter and A/C amp. as a result of conducting Self-diagnosis STEP-2.)

1.CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND

1. Turn ignition switch OFF.

2. Disconnect in-vehicle sensor connector.

3. Turn ignition switch ON.

4. Check voltage between in-vehicle sensor harness connector M32 terminal 1 and ground.

RJIA1804E

RJIA1452E

1 – Ground : Approx. 5V

OK or NG

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

RJIA0559E

2.CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR 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 in-vehicle sensor harness connector M32 terminal 2 and unified meter and A/C amp. harness connector M89 terminal 49.

2 – 49 : Continuity should exist.

OK or NG

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

RJIA1453E

3.CHECK IN-VEHICLE SENSOR

Refer to "In-vehicle Sensor". OK or NG

OK >> 1. Replace unified meter and A/C amp. Refer to ATC-92.

2. Go to ATC-34, " Confirm that code No. 20 is displayed.

NG >> 1. Replace in-vehicle sensor. Refer to ATC-94

2. Go to ATC-34, " Confirm that code No. 20 is displayed.

A/C System Self-Diagnosis Function" and perform self-diagnosis STEP 2.

ATC

ATC-81

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< SERVICE INFORMATION >

4.CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR 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 in-vehicle sensor harness connector M32 terminal 1 and unified meter and A/C amp. harness connector M89 terminal 40.

1 – 40 : Continuity should exist.

4. Check continuity between in-vehicle sensor harness connector M32 terminal 1 and ground.

1 – Ground : Continuity should not exist.

OK or NG

OK >> 1. Replace unified meter and A/C amp. Refer to ATC-92.

2. Go to ATC-34, "

A/C System Self-Diagnosis Function" and perform self-diagnosis STEP 2.

Confirm that code No. 20 is displayed.

NG >> Repair harness or connector.

COMPONENT INSPECTION

In-vehicle Sensor

After disconnecting in-vehicle sensor connector, measure resistance between terminals 1 and 2 at sensor harness side, using the table below.

Temperature °C (°F) Resistance kΩ

−15 (5) 12.73

−10 (14) 9.92

−5 (23) 7.80 0 (32) 6.19 5 (41) 4.95

10 (50) 3.99 15 (59) 3.24 20 (68) 2.65 25 (77) 2.19 30 (86) 1.81

35 (95) 1.51 40 (104) 1.27 45 (113) 1.07

If NG, replace in-vehicle sensor. Refer to ATC-94

RJIA1454E

RJIA1805E

Sunload Sensor Circuit INFOID:0000000001721321

COMPONENT DESCRIPTION

Sunload Sensor

ATC-82

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< SERVICE INFORMATION >

The sunload sensor is located on the passenger side defroster grille. It detects sunload entering through windshield by means of a photo diode. The sensor converts the sunload into a current value which is then input into the unified meter and A/C amp.

RJIA1806E

SUNLOAD INPUT PROCESS

The unified meter and A/C amp. also includes a processing circuit which averages the variations in detected sunload over a period of time. This prevents drastic swings in the ATC system operation due to small or quick variations in detected sunload. For example, consider driving along a road bordered by an occasional group of large trees. The sunload detected by the sunload sensor will vary whenever the trees obstruct the sunlight. The processing circuit averages the detected sunload over a period of time, so that the (insignificant) effect of the trees momentarily obstructing the sunlight does not cause any change in the ATC system operation. On the other hand, shortly after entering a long tunnel, the system will recognize the change in sunload, and the system will react accordingly.

DIAGNOSTIC PROCEDURE FOR SUNLOAD SENSOR

SYMPTOM: Sunload sensor circuit is open or shorted. (25 or −25 is indicated on unified meter and A/C amp. as a result of conducting Self-diagnosis STEP-2.)

RJIA1455E

1.CHECK VOLTAGE BETWEEN SUNLOAD SENSOR AND GROUND

1. Turn ignition switch OFF.

2. Disconnect sunload sensor connector.

3. Turn ignition switch ON.

4. Check voltage between sunload sensor harness connector M65 terminal 1 and ground.

1 – Ground : Approx. 5V

OK or NG

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

RJIA0254E

2.CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND UNIFIED METER AND A/C AMP.

ATC

ATC-83

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< SERVICE INFORMATION >

1. Turn ignition switch OFF.

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

3. Check continuity between sunload sensor harness connector M65 terminal 2 and unified meter and A/C amp. harness connector M89 terminal 49.

2 – 49 : Continuity should exist.

OK or NG

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

RJIA1456E

3.CHECK SUNLOAD SENSOR

Refer to "Sunload Sensor". OK or NG

OK >> 1. Replace unified meter and A/C amp. Refer to ATC-92.

2. Go to ATC-34, " Confirm that code No. 20 is displayed.

NG >> 1. Replace sunload sensor. Refer to ATC-95

2. Go to ATC-34, " Confirm that code No. 20 is displayed.

A/C System Self-Diagnosis Function" and perform self-diagnosis STEP-2.

4.CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR 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 sunload sensor harness connector M65 terminal 1 and display and unified meter and A/C amp. harness connector M89 terminal 50.

1 – 50 : Continuity should exist.

4. Check continuity between sunload sensor harness connector M65 terminal 1 and ground.

1 – Ground : Continuity should not exist.

OK or NG

OK >> 1. Replace unified meter and A/C amp. Refer to ATC-92.

2. Go to ATC-34, " Confirm that code No. 20 is displayed.

NG >> Repair harness or connector.

A/C System Self-Diagnosis Function" and perform self-diagnosis STEP-2.

COMPONENT INSPECTION

Sunload Sensor

RJIA1457E

ATC-84

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< SERVICE INFORMATION >

Measure voltage between unified meter and A/C amp. harness connector M89 terminal 50 and ground. If NG, replace unified meter and A/C amp. Refer to ATC-92

WJIA1176E

• When checking sunload sensor, select a place where sun shines directly on it.

SHA930E

Intake Sensor Circuit INFOID:0000000001721322

COMPONENT DESCRIPTION

ATC

Intake Sensor

The intake sensor is located in the heater and cooling unit assembly on the evaporator. It converts temperature of air after it passes through the evaporator into a resistance value which is then input to the unified meter and A/C amp.

RJIA1808E

ATC-85

Nissan Maxima 2008 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual