manual air conditioner

manual air conditioner

J AIR CONDITIONER

SECTION

MANUAL AIR CONDITIONER

B

C

D

A

E

CONTENTS

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

Precautions for Supplemental Restraint System

(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-

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

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

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

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

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

A/C Identification Label ............................................ 6

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

FEATURES OF NEW TYPE REFRIGERANT

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

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

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

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

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

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

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

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

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

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

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

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

Wiring Diagrams and Trouble Diagnosis .................11

PREPARATION ......................................................... 12

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

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

Commercial Service Tools ...................................... 15

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

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

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

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

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

PRESSURE RELIEF VALVE .............................. 17

Component Layout ................................................. 18

REFRIGERATION SYSTEM ............................... 18

LUBRICANT ............................................................. 20

Maintenance of Lubricant Quantity in Compressor... 20

LUBRICANT ........................................................ 20

CHECKING AND ADJUSTING ........................... 20

AIR CONDITIONER CONTROL ............................... 22

Description .............................................................. 22

Operation ................................................................ 22

AIR MIX DOOR CONTROL ................................. 22

BLOWER SPEED CONTROL ............................. 22

INTAKE DOORS CONTROL ............................... 22

MODE DOOR CONTROL ................................... 22

DEFROSTER DOOR CONTROL ........................ 22

MAGNET CLUTCH CONTROL ........................... 22

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

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

Control Operation ................................................... 24

TEMPERATURE CONTROL DIAL (TEMPERA-

TURE CONTROL) ............................................... 25

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

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

OFF SWITCH (BLOWER SPEED SET TO 0) ..... 25

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

MODE CONTROL DIAL ...................................... 25

FRONT BLOWER CONTROL DIAL .................... 25

Discharge Air Flow ................................................. 25

System Description ................................................. 26

SWITCHES AND THEIR CONTROL FUNCTION... 26

CAN Communication System Description .............. 27

TROUBLE DIAGNOSIS ............................................ 28

CONSULT-II Function (HVAC) ................................ 28

CONSULT-II BASIC OPERATION ....................... 28

SELF-DIAGNOSIS .............................................. 29

DATA MONITOR ................................................. 29

CONSULT-II Function (BCM) ................................. 31

CONSULT-II BASIC OPERATION ....................... 31

DATA MONITOR ................................................. 32

How to Perform Trouble Diagnosis for Quick and

Accurate Repair ...................................................... 33

WORK FLOW ...................................................... 33

SYMPTOM TABLE .............................................. 33

Component Parts and Harness Connector Location... 34

ENGINE COMPARTMENT .................................. 34

FRONT PASSENGER COMPARTMENT ............ 35

Schematic ............................................................... 36

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Wiring Diagram — A/C — ....................................... 37

Front Air Control Terminals and Reference Value... 43

PIN CONNECTOR TERMINAL LAYOUT ............ 43

TERMINALS AND REFERENCE VALUE FOR

FRONT AIR CONTROL ....................................... 43

A/C System Self-diagnosis Function (With NAVI

Only) ....................................................................... 45

DESCRIPTION .................................................... 45

Operational Check .................................................. 47

CHECKING BLOWER ......................................... 47

CHECKING DISCHARGE AIR ............................ 47

CHECKING RECIRCULATION ............................ 47

CHECKING TEMPERATURE DECREASE ......... 48

CHECKING TEMPERATURE INCREASE .......... 48

CHECK A/C SWITCH .......................................... 48

Power Supply and Ground Circuit for Front Air Control ........................................................................... 49

INSPECTION FLOW ........................................... 49

COMPONENT DESCRIPTION ............................ 50

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM... 50

Mode Door Motor Circuit ........................................ 52

INSPECTION FLOW ........................................... 52

SYSTEM DESCRIPTION .................................... 53

COMPONENT DESCRIPTION ............................ 53

DIAGNOSTIC PROCEDURE FOR MODE

DOOR MOTOR ................................................... 53

Air Mix Door Motor Circuit ...................................... 56

INSPECTION FLOW ........................................... 56

SYSTEM DESCRIPTION .................................... 57

COMPONENT DESCRIPTION ............................ 57

DIAGNOSTIC PROCEDURE FOR AIR MIX

DOOR MOTOR (FRONT) .................................... 58

Intake Door Motor Circuit ........................................ 60

INSPECTION FLOW ........................................... 60

SYSTEM DESCRIPTION .................................... 61

COMPONENT DESCRIPTION ............................ 61

DIAGNOSTIC PROCEDURE FOR INTAKE

DOOR MOTOR ................................................... 62

Defroster Door Motor Circuit ................................... 63

SYMPTOM: .......................................................... 63

INSPECTION FLOW ........................................... 63

SYSTEM DESCRIPTION .................................... 64

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

DIAGNOSTIC PROCEDURE FOR

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

Front Blower Motor Circuit ...................................... 67

INSPECTION FLOW ........................................... 67

SYSTEM DESCRIPTION .................................... 68

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

DIAGNOSTIC PROCEDURE FOR BLOWER

MOTOR ............................................................... 69

COMPONENT INSPECTION .............................. 73

Magnet Clutch Circuit ............................................. 74

INSPECTION FLOW ........................................... 74

SYSTEM DESCRIPTION .................................... 75

DIAGNOSTIC PROCEDURE FOR MAGNET

CLUTCH .............................................................. 75

COMPONENT INSPECTION .............................. 79

Insufficient Cooling ................................................. 80

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MTC-2

INSPECTION FLOW ............................................80

PERFORMANCE TEST DIAGNOSES ................81

PERFORMANCE CHART ....................................83

TROUBLE DIAGNOSES FOR UNUSUAL PRES-

SURE ...................................................................84

Insufficient Heating .................................................87

INSPECTION FLOW ............................................87

Noise .......................................................................88

INSPECTION FLOW ............................................88

Self-diagnosis .........................................................89

INSPECTION FLOW ............................................89

Water Valve Circuit ..................................................90

COMPONENT DESCRIPTION ............................90

DIAGNOSTIC PROCEDURE FOR WATER

VALVE ..................................................................90

COMPONENT INSPECTION ...............................92

Intake Sensor Circuit ...............................................92

COMPONENT DESCRIPTION ............................92

DIAGNOSTIC PROCEDUREFOR INTAKESEN-

SOR .....................................................................92

COMPONENT INSPECTION ...............................94

CONTROL UNIT ........................................................95

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

REMOVAL ............................................................95

INSTALLATION ....................................................95

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

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

REMOVAL ............................................................96

INSTALLATION ....................................................96

BLOWER MOTOR .....................................................97

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

REMOVAL ............................................................97

INSTALLATION ....................................................97

IN-CABIN MICROFILTER ..........................................98

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

FUNCTION ..........................................................98

REPLACEMENT TIMING ....................................98

REPLACEMENT PROCEDURE ..........................98

HEATER & COOLING UNIT ASSEMBLY ...............100

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

REMOVAL ..........................................................100

INSTALLATION ..................................................101

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

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

REMOVAL ..........................................................103

INSTALLATION ..................................................103

DEFROSTER DOOR MOTOR .................................104

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

REMOVAL ..........................................................104

INSTALLATION ..................................................104

INTAKE DOOR MOTOR ..........................................105

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

REMOVAL ..........................................................105

INSTALLATION ..................................................105

MODE DOOR MOTOR ............................................106

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

REMOVAL ..........................................................106

INSTALLATION ..................................................106

2005 Titan

AIR MIX DOOR MOTOR ......................................... 107

Removal and Installation ...................................... 107

REMOVAL ......................................................... 107

INSTALLATION ................................................. 107

VARIABLE BLOWER CONTROL .......................... 108

Removal and Installation ...................................... 108

REMOVAL ......................................................... 108

INSTALLATION ................................................. 108

DUCTS AND GRILLES .......................................... 109

Removal and Installation ...................................... 109

DEFROSTER NOZZLE ......................................110

RH AND LH SIDE DEMISTER DUCT ................110

RH AND LH VENTILATOR DUCT ......................110

CENTER VENTILATOR DUCT .......................... 111

FLOOR DUCT .................................................... 111

GRILLES ............................................................ 111

REFRIGERANT LINES ............................................112

HFC-134a (R-134a) Service Procedure ................112

SETTING OF SERVICE TOOLS AND EQUIP-

MENT .................................................................112

Components ..........................................................114

Removal and Installation for Compressor .............115

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

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

Removal and Installation for Compressor Clutch ..116

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

INSPECTION .....................................................117

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

BREAK-IN OPERATION ....................................119

Removal and Installation for Low-pressure Flexible

Hose ......................................................................119

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

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

Removal and Installation for High-pressure Flexible

Hose ......................................................................119

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

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

Removal and Installation for High-pressure Pipe . 120

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

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

Removal and Installation for Low-pressure Pipe .. 120

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

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

Removal and Installation for Refrigerant Pressure

Sensor .................................................................. 120

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

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

Removal and Installation for Condenser .............. 120

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

INSTALLATION ................................................. 121

Removal and Installation for Evaporator .............. 122

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

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

Removal and Installation for Expansion Valve ...... 123

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

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

Checking for Refrigerant Leaks ............................ 123

Checking System for Leaks Using the Fluorescent

Dye Leak Detector ................................................ 123

Dye Injection ......................................................... 124

Electronic Refrigerant Leak Detector .................... 124

PRECAUTIONS FOR HANDLING LEAK

DETECTOR ....................................................... 124

CHECKING PROCEDURE ............................... 125

SERVICE DATA AND SPECIFICATIONS (SDS) .... 127

Service Data and Specifications (SDS) ................ 127

COMPRESSOR ................................................ 127

LUBRICANT ...................................................... 127

REFRIGERANT ................................................. 127

ENGINE IDLING SPEED .................................. 127

BELT TENSION ................................................. 127

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PRECAUTIONS

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT

BELT PRE-TENSIONER”

EJS0031M

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 equipment on any circuit related to the SRS unless instructed to in this

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

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

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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

MTC-4, "Contaminated Refrigerant"

. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant

Recovery/Recycling Recharging equipment and Refrigerant Identifier.

Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If lubricant other than that specified is used, compressor failure is likely to occur.

The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The following handling precautions must be observed:

When removing refrigerant components from a vehicle, immediately cap (seal) the component to 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 lubricant from a sealed container. Immediately reseal containers of lubricant. Without proper sealing, lubricant will become moisture saturated and should not be used.

Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and throat. Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting requirements of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a) recovery equipment]. If accidental system discharge occurs, ventilate work area before resuming service. Additional health and safety information may be obtained from refrigerant and lubricant manufacturers.

Do not allow lubricant, NISSAN A/C System Lubricant Type S (DH-PS) or equivalent, to come in contact with styrofoam parts. Damage may result.

Contaminated Refrigerant

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If a refrigerant other than pure HFC-134a (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.

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PRECAUTIONS

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 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 Precautions

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WARNING:

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

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

Do not store or heat refrigerant containers above 52

°

C (125

°

F).

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

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

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

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

Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air conditioning systems with compressed air during repair. Some mixtures of air and 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.

Precautions for Leak Detection Dye

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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 goggles to protect your eyes and enhance the visibility of the fluorescent dye.

The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The 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 left on a surface for an extended period of time cannot be removed .

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

Do not use more than one refrigerant dye bottle (1/4 ounce / 7.4 cc) per A/C system.

Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12) A/C systems are different. Do not use

HFC-134a (R-134a) leak detection dye in CFC-12 (R-12) A/C systems or CFC-12 (R-12) leak detection dye in HFC-134a (R-134a) A/C systems or A/C system damage may result.

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

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PRECAUTIONS

A/C Identification Label

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

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Precautions for Refrigerant Connection

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A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.

Expansion valve to cooling unit

Evaporator pipes to evaporator (inside cooling unit)

Refrigerant pressure sensor

FEATURES OF NEW TYPE REFRIGERANT CONNECTION

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

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

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PRECAUTIONS

O-RING AND REFRIGERANT CONNECTION

A/C Compressor and Condenser

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PRECAUTIONS

1.

High-pressure service valve

4.

Refrigerant pressure sensor

7.

High-pressure flexible hose

10. Low-pressure pipe

2.

Grommet

5.

Condenser

8.

Low-pressure flexible hose

11.

Expansion valve

3.

High-pressure pipe

6.

Compressor shaft seal

9.

Low-pressure service valve

12. Drain hose

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

SHA814E

Connection type

New

Former

New

Former

New

Former

New

Former

New

O-ring size

8

10

12

16

19

Part number*

92471 N8210

J2476 89956

92472 N8210

92475 71L00

92473 N8210

92475 72L00

92474 N8210

92477 N8200

92195 AH300

D mm (in)

6.8 (0.268)

9.25 (0.3642)

10.9 (0.429)

11.0 (0.433)

13.6 (0.535)

14.3 (0.563)

16.5 (0.650)

17.12 (0.6740)

21.8 (0.858)

W mm (in)

1.85 (0.0728)

1.78 (0.0701)

2.43 (0.0957)

2.4 (0.094)

2.43 (0.0957)

2.3 (0.091)

2.43 (0.0957)

1.78 (0.0701)

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

WARNING:

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

CAUTION:

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

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

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

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

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

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

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

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

Always replace used O-rings.

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

Lubricant name: NISSAN A/C System Lubricant Type S (DH-PS)

Part number: KLH00-PAGS0

O-ring must be closely attached to dented portion of tube.

When replacing the O-ring, be careful not to damage O-ring and tube.

Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that the O-ring is installed to tube correctly.

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PRECAUTIONS

After connecting line, conduct leak test and make sure that there is no leakage from connections.

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

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Precautions for Servicing Compressor

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

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

When replacing or repairing compressor, follow “Maintenance of Lubricant Quantity in Compressor” exactly. Refer to

MTC-20, "Maintenance of Lubricant Quantity in Compressor"

.

Keep friction surfaces between clutch and pulley clean. If the surface is contaminated with lubricant, wipe it off by using a clean waste cloth moistened with thinner.

After compressor service operation, turn the compressor shaft by hand more than 5 turns in both directions. This will equally distribute lubricant inside the compressor. After the compressor is installed, let the engine idle and operate the compressor for 1 hour.

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

MTC-116, "Removal and Installation for Compressor Clutch"

.

Precautions for Service Equipment

RECOVERY/RECYCLING EQUIPMENT

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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.

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PRECAUTIONS

VACUUM PUMP

The lubricant contained inside the vacuum pump is not compatible with the specified lubricant for HFC-134a (R-134a) A/C systems.

The vent side of the vacuum pump is exposed to atmospheric pressure so the vacuum pump lubricant may migrate out of the pump into the service hose. This is possible when the pump is switched off after evacuation (vacuuming) and hose is connected to it.

To prevent this migration, use a manual valve situated near the hose-to-pump connection, as follows.

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

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

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

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

MANIFOLD GAUGE SET

Be certain that the gauge face indicates HFC-134a (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 HFC-134a (R-134a) along with specified lubricant.

SERVICE HOSES

Be certain that the service hoses display the markings described

(colored hose with black stripe). All hoses must include positive shutoff devices (either manual or automatic) near the end of the hoses opposite the manifold gauge.

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PRECAUTIONS

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. If an improper connection is attempted, discharging and contamination may occur.

Shut-off valve rotation

Clockwise

Counterclockwise

A/C service valve

Open

Close

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REFRIGERANT WEIGHT SCALE

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

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CHARGING CYLINDER

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

Wiring Diagrams and Trouble Diagnosis

When you read wiring diagrams, refer to the following:

GI-14, "How to Read Wiring Diagrams"

PG-4, "POWER SUPPLY ROUTING CIRCUIT"

When you perform trouble diagnosis, refer to the following:

GI-9, "How to Follow Trouble Diagnoses"

GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident"

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PREPARATION

PREPARATION

Special Service Tools

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

PFP:00002

EJS003RG

Description Tool number

(Kent-Moore No.)

Tool name

(J-38873-A)

Pulley installer

Installing pulley

LHA171

KV99233130

(J-29884)

Pulley puller

Removing pulley

LHA172

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

EJS003RH

Never mix HFC-134a (R-134a) refrigerant and/or the specified lubricant with CFC-12 (R-12) refrigerant and/or the lubricant.

Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/lubricant.

Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles refrigerant and/or lubricant) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid mixed use of the refrigerants/lubricant.

Adapters that convert one size fitting to another must never be used refrigerant/lubricant contamination will occur and compressor failure will result.

Description Tool number

(Kent-Moore No.)

Tool name

HFC-134a (R-134a)

( — )

Refrigerant

Container color: Light blue

Container marking: HFC-134a (R-

134a)

Fitting size: Thread size

● large container 1/2”-16 ACME

S-NT196

KLH00-PAGR0

( — )

NISSAN A/C System Lubricant

Type S (DH-PS)

(J-43600)

Recovery/Recycling

Recharging equipment (ACR2000)

S-NT197

Type: Poly alkylene glycol oil (PAG), type S (DH-PS)

Application: HFC-134a (R-134a) swash plate compressors (NISSAN only)

Lubricity: 40 m (1.4 US fl oz, 1.4 Imp fl oz)

Refrigerant Recovery and Recycling and Recharging

Revision: October 2004

MTC-12

WJIA0293E

2005 Titan

Tool number

(Kent-Moore No.)

Tool name

(J-41995)

Electronic refrigerant leak detector

(J-43926)

Refrigerant dye leak detection kit

Kit includes:

(J-42220) UV lamp and UV safety goggles

(J-41459) Refrigerant dye injector

(J-41447) qty. 24

HFC-134a (R-134a) refrigerant 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)

(J-41459)

HFC-134a (R-134a) Dye injector

Use with J-41447, 1/4 ounce bottle

(J-43872)

Refrigerant dye cleaner

PREPARATION

Description

Power supply:

DC 12V (battery terminal)

A

B

AHA281A

Power supply:

DC 12V (battery terminal)

F

G

SHA438F

SHA439F

ZHA200H

H

Power supply:

DC 12V (battery terminal)

For checking refrigerant leak when fluorescent dye is installed in A/C system.

Includes: UV lamp and UV safety goggles

I

MTC

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.)

K

L

M

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

C

D

E

SHA440F

For cleaning dye spills.

Revision: October 2004

MTC-13

SHA441F

2005 Titan

Tool number

(Kent-Moore No.)

Tool name

(J-39183-C)

Manifold gauge set (with hoses and couplers)

PREPARATION

Description

Identification:

The gauge face indicates R-134a.

Fitting size-Thread size

1/2”-16 ACME

Service hoses:

High side hose

(J-39500-72B)

Low side hose

(J-39500-72R)

Utility hose

(J-39500-72Y)

Service couplers

High side coupler

(J-39500-20A)

Low side coupler

(J-39500-24A)

(J-39699)

Refrigerant weight scale

(J-39649)

Vacuum pump

(Including the isolator valve)

S-NT201

RJIA0196E

Hose color:

Low side hose: Blue with black stripe

High side hose: Red with black stripe

Utility hose: Yellow with black stripe or green with black stripe

Hose fitting to gauge:

1/2”-16 ACME

Hose fitting to service hose:

M14 x 1.5 fitting is optional or permanently attached.

S-NT202

For measuring of refrigerant

Fitting size-Thread size

1/2”-16 ACME

S-NT200

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

Revision: October 2004

MTC-14

2005 Titan

Commercial Service Tools

Tool name

(J-41810-NI)

Refrigerant identifier equipment (R-

134a)

Power tool

(J-44614)

Clutch disc holding tool

PREPARATION

PBIC0190E

RJIA0197E

Description

For checking refrigerant purity and system contamination

EJS003RI

A

B

Loosening bolts and nuts

C

D

E

Clutch disc holding tool

F

G

H

WHA230

K

L

M

I

MTC

Revision: October 2004

MTC-15

2005 Titan

REFRIGERATION SYSTEM

REFRIGERATION SYSTEM

PFP:KA990

Refrigerant Cycle

REFRIGERANT FLOW

EJS0031Z

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 coils are controlled by externally equalized expansion valve, located inside the evaporator case.

Refrigerant System Protection

REFRIGERANT PRESSURE SENSOR

EJS00320

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 a voltage signal to the ECM.

The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm

2

, 398 psi), or below about 120 kPa (1.22 kg/cm

2

, 17.4 psi).

Revision: October 2004

MTC-16

2005 Titan

REFRIGERATION SYSTEM

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 2,990 kPa (30.5 kg/ cm

2

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

A

B

C

D

E

F

G

H

I

MTC

K

L

M

WJIA1347E

Revision: October 2004

MTC-17

2005 Titan

Component Layout

REFRIGERATION SYSTEM

REFRIGERATION SYSTEM

EJS00321

Revision: October 2004

MTC-18

LJIA0141E

2005 Titan

1.

Defroster nozzle

4.

RH side demister duct

7.

Heater and cooling unit assembly

REFRIGERATION SYSTEM

2.

LH side demister duct

5.

RH ventilator duct

8.

Floor duct

3.

LH ventilator duct

6.

Center ventilator duct

9.

Clips

F

G

H

I

MTC

K

L

M

C

D

E

A

B

Revision: October 2004

MTC-19

2005 Titan

LUBRICANT

LUBRICANT

Maintenance of Lubricant Quantity in Compressor

PFP:KLG00

EJS00322

The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compressor when replacing any component or after a large refrigerant leakage has occurred. It is important to maintain the specified amount.

If lubricant quantity is not maintained properly, the following malfunctions may result:

Lack of lubricant: May lead to a seized compressor

Excessive lubricant: Inadequate cooling (thermal exchange interference)

LUBRICANT

Name: NISSAN A/C System Lubricant Type S (DH-PS)

Part number: KLH00-PAGS0

CHECKING AND ADJUSTING

CAUTION:

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

Start the engine and set the following conditions:

test condition

Engine speed: Idling to 1,200 rpm

A/C switch: On

Blower speed: Max. position

Temperature control: Optional [set so that intake air temperature is 25

°

to 30

°

C (77

°

to 86

°

F).]

Intake position: Recirculation ( )

Perform lubricant return operation for about ten minutes

Adjust the lubricant quantity according to the following table.

Lubricant Adjusting Procedure for Components Replacement Except Compressor

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

Amount of lubricant to be added:

Front evaporator

Condenser

Liquid tank

Part replaced

In case of refrigerant leak

Lubricant to be added to system

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

75 (2.5, 2.6)

75 (2.5, 2.6)

5 (0.2, 0.2)

30 (1.0, 1.1)

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

Remarks

Add if compressor is not replaced.

Large leak

Small leak *1

Lubricant Adjustment Procedure for Compressor Replacement

1.

Before connecting recovery/recycling equipment to vehicle, check recovery/recycling equipment gauges.

No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines.

2.

Connect recovery/recycling equipment to vehicle. Confirm refrigerant purity in supply tank using recovery/ recycling equipment and refrigerant identifier. If NG, refer to

MTC-4, "Contaminated Refrigerant"

.

3.

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

MTC-4, "Contaminated Refrigerant"

.

4.

Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure lubricant discharged into the recovery/recycling equipment.

5.

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

6.

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

7.

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

Revision: October 2004

MTC-20

2005 Titan

LUBRICANT

8.

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

9.

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

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

A

B

C

D

E

RHA065DD

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-21

2005 Titan

AIR CONDITIONER CONTROL

AIR CONDITIONER CONTROL

Description

PFP:27500

EJS003TN

The front air control provides regulation of the vehicle's interior temperature. The system is based on the position of the front air controls temperature switch selected by the driver. This is done by utilizing a microcomputer, also referred to as the front air control, which receives input signals from the following two sensors:

Intake sensor

PBR (Position Balanced Resistor).

The front air control uses these signals (including the set position of the temperature switch) to control:

Outlet air volume

Air temperature

Air distribution

Operation

AIR MIX DOOR CONTROL

EJS003TO

The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature switch.

BLOWER SPEED CONTROL

Blower speed is controlled based on front blower switch settings.

When blower switch is turned, the blower motor starts and increases air flow volume each time the blower switch is turned clockwise, and decreases air flow volume each time the blower switch is turned counterclockwise.

When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flowing.

INTAKE DOORS CONTROL

The intake doors are controlled by the recirculation switch setting, and the mode (recirculation is not allowed in floor, floor/defrost or defrost modes) control dial setting.

MODE DOOR CONTROL

The mode door is controlled by the position of the mode control dial.

DEFROSTER DOOR CONTROL

The defroster door is controlled by turning the defroster dial to front defroster.

MAGNET CLUTCH CONTROL

WJIA1379E

When A/C switch or DEF switch is pressed, front air control inputs compressor ON signal to BCM.

BCM sends compressor ON signal to ECM, via CAN communication line.

Revision: October 2004

MTC-22

2005 Titan

AIR CONDITIONER CONTROL

ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sensor signal, throttle angle sensor, 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 front air control to quickly locate the cause of symptoms. Refer to

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)"

.

A

B

C

D

E

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-23

2005 Titan

AIR CONDITIONER CONTROL

Description of Control System

The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.

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

EJS003TP

Control Operation

Front air control

WJIA1448E

EJS003TQ

Revision: October 2004

MTC-24

WJIA1405E

2005 Titan

AIR CONDITIONER CONTROL

TEMPERATURE CONTROL DIAL (TEMPERATURE CONTROL)

Increases or decreases the set temperature.

RECIRCULATION () SWITCH

When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.

When REC switch is turned OFF, or when compressor is turned from ON to OFF, REC switch is automatically turned OFF. REC mode can be re-entered by pressing REC switch again.

REC switch is not operated when DEF switch is turned ON, at the D/F position, or in floor mode.

REAR WINDOW DEFOGGER SWITCH

When switch is ON, rear window is defogged.

OFF SWITCH (BLOWER SPEED SET TO 0)

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 position.

A/C SWITCH

The compressor is ON or OFF.

MODE CONTROL DIAL

Controls the air discharge outlets through control of the mode and defroster doors.

FRONT BLOWER CONTROL DIAL

Manually control the blower speed. Fourteen speeds are available for manual control.

A

B

C

D

E

F

G

Discharge Air Flow

EJS003TR

H

I

MTC

WJIA0540E

K

L

M

WJIA1297E

Revision: October 2004

MTC-25

2005 Titan

AIR CONDITIONER CONTROL

System Description

SWITCHES AND THEIR CONTROL FUNCTION

EJS003TS

WJIA0531E

Revision: October 2004

MTC-26

WJIA1406E

2005 Titan

AIR CONDITIONER CONTROL

CAN Communication System Description

Refer to LAN-7, "CAN COMMUNICATION" .

EJS003TU

A

B

C

D

E

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-27

2005 Titan

TROUBLE DIAGNOSIS

TROUBLE DIAGNOSIS

CONSULT-II Function (HVAC)

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

Diagnostic mode

SELF-DIAG RESULTS

DATA MONITOR

CAN DIAG SUPPORT MNTR

ECU PART NUMBER

Description

Displays front air control self-diagnosis results.

Displays front air control input/output data in real time.

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

Front air control part number can be read.

PFP:00004

EJS003TV

CONSULT-II BASIC OPERATION

CAUTION:

If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be detected in self-diagnosis depending on control unit which carries out CAN communication.

1.

With the ignition switch OFF, connect CONSULT-II and CON-

SULT-II CONVERTER to the data link connector, and turn the ignition switch ON.

BBIA0369E

2.

Touch “START (NISSAN BASED VHCL)”.

BCIA0029E

3.

Touch “HVAC” on “SELECT SYSTEM” screen. If “HVAC” is not indicated, go to GI-38, "CONSULT-II Data Link Connector (DLC)

Circuit" .

Revision: October 2004

MTC-28

BCIA0030E

2005 Titan

TROUBLE DIAGNOSIS

SELF-DIAGNOSIS

Operation Procedure

1.

Touch “SELF-DIAG RESULTS” on “SELECT DIAG MODE” screen to view all set DTC's.

A

B

C

D

BCIA0031E

Display Item List

E

DTC

B2573

B2575

B2576

B2577

B2581

B2582

B2583

U1000

B2586

B2587

B2588

Description

Battery voltage out of range

BCM not responding to A/C request

BCM not responding to rear defroster request

Air mix door motor (Front) circuit failure

Intake sensor circuit short

Intake sensor circuit open

Defroster door motor circuit failure

CAN bus fault

Intake door motor (front) circuit malfunction

Stuck button

Mode door motor circuit failure

Reference page

SC-4, "BATTERY"

MTC-75, "DIAGNOSTIC PROCEDURE FOR MAGNET

CLUTCH"

GW-95, "REAR WINDOW DEFOGGER"

MTC-58, "DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR

MOTOR (FRONT)"

MTC-60, "Intake Door Motor Circuit"

MTC-63, "Defroster Door Motor Circuit"

LAN-7, "CAN COMMUNICATION"

MTC-60, "Intake Door Motor Circuit"

MTC-95, "CONTROL UNIT"

MTC-52, "Mode Door Motor Circuit"

F

G

H

I

MTC

K

DATA MONITOR

Operation Procedure

1.

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

L

M

BCIA0031E

2.

Touch either “MAIN SIGNALS” or “SELECTION FROM MENU” on “DATA MONITOR” screen.

All signals

Selection from menu

Monitors all the items.

Selects and monitors the individual item selected.

3.

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

4.

Touch “START”.

Revision: October 2004

MTC-29

2005 Titan

TROUBLE DIAGNOSIS

5.

Touch “RECORD” while monitoring, then the status of the monitored item can be recorded. To stop recording, touch “STOP”.

Display Item List

Monitor item

BATT VIA CAN

IGN VIA CAN

EVAP TEMP SEN

RR TEMPSET FR

MODE FDBCK

DVR MIX FDBCK

DEF FDBCK

RECIRC

Value

"V" Displays battery voltage signal.

"ON/OFF" Displays ignition switch signal.

"

°

C/

°

F" Displays intake sensor signal.

Contents

"V"

"V"

"V"

"V"

Displays air mix door (front) set point signal.

Displays mode door motor feedback signal.

Displays air mix door motor (front) feedback signal.

Displays defroster door motor feedback signal.

"ON/OFF" Displays recirculation switch signal.

A/C

RR DEFOG

MODE SELECT

"ON/OFF" Displays A/C switch signal.

"ON/OFF" Displays rear defroster request signal.

" [ PNL ]"

" [ MIX ]"

" [ FLR ]"

" [ DEFR ]"

" [ MAX ]"

" [ DENT ]"

Displays mode door motor position.

*: DENT is displayed when MODE switch is between selections.

Revision: October 2004

MTC-30

2005 Titan

TROUBLE DIAGNOSIS

CONSULT-II Function (BCM)

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

BCM diagnostic test item

Diagnostic mode Description

Inspection by part

EJS003TW

WORK SUPPORT

DATA MONITOR

ACTIVE TEST

Supports inspections and adjustments. Commands are transmitted to the BCM for setting the status suitable for required operation, input/output signals are received from the BCM and received data is displayed.

Displays BCM input/output data in real time.

Operation of electrical loads can be checked by sending drive signal to them.

SELF-DIAG RESULTS Displays BCM self-diagnosis results.

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

ECU PART NUMBER

CONFIGURATION

BCM part number can be read.

Performs BCM configuration read/write functions.

A

B

C

D

E

CONSULT-II BASIC OPERATION

CAUTION:

If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be detected in self-diagnosis depending on control unit which carries out CAN communication.

1.

With the ignition switch OFF, connect CONSULT-II and CON-

SULT-II CONVERTER to the data link connector, and turn the ignition switch ON.

F

G

H

2.

Touch “START (NISSAN BASED VHCL)”.

I

BBIA0369E

MTC

K

L

M

BCIA0029E

3.

Touch “BCM” on “SELECT SYSTEM” screen. If “BCM” is not indicated, go to GI-38, "CONSULT-II Data Link Connector (DLC)

Circuit" .

Revision: October 2004

MTC-31

BCIA0030E

2005 Titan

TROUBLE DIAGNOSIS

DATA MONITOR

Operation Procedure

1.

Touch “AIR CONDITIONER" on "SELECT TEST ITEM" screen.

WJIA0468E

2.

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

BCIA0031E

3.

Touch either "ALL SIGNALS" or "SELECTION FROM MENU" on

"DATA MONITOR" screen.

All Signals

Selection from menu

Monitors all the items.

Selects and monitors the individual item selected.

4.

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

5.

Touch "START".

6.

Touch "RECORD" while monitoring, then the status of the monitored item can be recorded. To stop recording, touch "STOP".

Display Item List

WJIA0469E

Monitor item name “operation or unit”

IGN ON SW

COMP ON SIG

FAN ON SIG

Contents

“ON/OFF”

Displays “IGN Position (ON)/(OFF), ACC Position (OFF)” status as judged from ignition switch signal.

“ON/OFF” Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.

“ON/OFF” Displays “FAN (ON)/FAN (OFF)” status as judged from blower motor switch signal.

Revision: October 2004

MTC-32

2005 Titan

TROUBLE DIAGNOSIS

How to Perform Trouble Diagnosis for Quick and Accurate Repair

WORK FLOW

*1

MTC-47, "Operational Check"

.

SYMPTOM TABLE

Symptom

A/C system does not come on.

A/C system cannot be controlled.

Air outlet does not change.

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Air mix door motor is malfunctioning.

Intake door does not change.

Intake door motor is malfunctioning.

Defroster door motor is malfunctioning.

Front blower motor operation is malfunctioning.

Magnet clutch does not engage.

Insufficient cooling

Insufficient heating

Noise

Self-diagnosis cannot be performed.

Reference Page

Go to Trouble Diagnosis Procedure for A/C System.

Go to Self-diagnosis Function.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

Go to Trouble Diagnosis Procedure for Defroster Door Motor.

Go to Trouble Diagnosis Procedure for Front Blower Motor.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

Go to Trouble Diagnosis Procedure for Insufficient Heating.

Go to Trouble Diagnosis Procedure for Noise.

Go to Trouble Diagnosis Procedure for Self-diagnosis.

MTC-49

MTC-45

MTC-52

MTC-56

MTC-60

MTC-63

MTC-67

MTC-74

MTC-80

MTC-87

MTC-88

MTC-89

SHA900E

EJS003TX

A

B

C

D

E

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-33

2005 Titan

TROUBLE DIAGNOSIS

Component Parts and Harness Connector Location

ENGINE COMPARTMENT

EJS003TY

Revision: October 2004

MTC-34

WJIA1407E

2005 Titan

TROUBLE DIAGNOSIS

FRONT PASSENGER COMPARTMENT

Revision: October 2004

MTC-35

WJIA1449E

2005 Titan

F

G

H

I

MTC

K

L

M

C

D

E

A

B

Schematic

TROUBLE DIAGNOSIS

EJS003TZ

Revision: October 2004

MTC-36

WJWA0217E

2005 Titan

Wiring Diagram — A/C —

TROUBLE DIAGNOSIS

EJS003U0

A

B

C

D

E

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-37

WJWA0218E

2005 Titan

TROUBLE DIAGNOSIS

Revision: October 2004

MTC-38

WJWA0219E

2005 Titan

Revision: October 2004

TROUBLE DIAGNOSIS

MTC-39

WJWA0220E

2005 Titan

F

G

H

I

MTC

K

L

M

C

D

E

A

B

TROUBLE DIAGNOSIS

Revision: October 2004

MTC-40

WJWA0221E

2005 Titan

Revision: October 2004

TROUBLE DIAGNOSIS

MTC-41

WJWA0222E

2005 Titan

F

G

H

I

MTC

K

L

M

C

D

E

A

B

TROUBLE DIAGNOSIS

Revision: October 2004

MTC-42

WJWA0223E

2005 Titan

TROUBLE DIAGNOSIS

Front Air Control Terminals and Reference Value

Measure voltage between each terminal and ground by following

Terminals and Reference Value for front air control.

PIN CONNECTOR TERMINAL LAYOUT

TERMINALS AND REFERENCE VALUE FOR FRONT AIR CONTROL

6

7

4

5

8

9

Terminal No.

1

2

3

10

11

12

18

19

20

21

14

15

16

22

23

W/G

Y/B

W/R

Y/G

P

GR

SB

LG

P/B

V/R

Y/R

R/L

Wire color

B

Y

W/G

Item

Ground

Sensor power

Air mix door motor (Front) CW

G Air mix door motor (Front) CCW

BR/W Mode door motor CW

P/L

O

G/B

Mode door motor CCW

Intake door motor CCW

Intake door motor CW

L/B Intake sensor

Water valve

Rear defroster request

Compressor ON signal

Power supply for IGN

Sensor ground

Mode door motor feedback

Air mix door motor (Front) feedback

Defroster door motor CW

Defroster door motor CCW

Sensor return

Power supply for BAT

Illumination +

Ignition switch

-

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

-

ON

Condition

-

-

Clockwise rotation

Counterclockwise rotation

Clockwise rotation

Counterclockwise rotation

Counterclockwise rotation

Clockwise rotation

-

Water valve open

Water valve closed

-

A/C switch OFF

A/C switch ON

-

-

-

-

Clockwise rotation

Counterclockwise rotation

-

-

Park lamps ON

Revision: October 2004

MTC-43

EJS003U1

A

B

C

WJIA1412E

D

E

F

G

WJIA0402E

H

Voltage (V)

(Approx.)

0V

5V

Battery voltage

Battery voltage

Battery voltage

Battery voltage

Battery voltage

Battery voltage

0 - 5V

0V

5V

Battery voltage

5V

0V

Battery voltage

0V

0 - 5V

0 - 5V

Battery voltage

Battery voltage

0 - 5V

Battery voltage

Battery voltage

2005 Titan

I

MTC

K

L

M

Terminal No.

Wire color

24 BR Illumination -

Item

TROUBLE DIAGNOSIS

Ignition switch

Condition

Park lamps ON

34

35

36

40

25

26

LG/B Defroster door motor feedback

R/B Front blower request

L

P

L/R

G/R

CAN-H

CAN-L

Fan ON signal

Variable Blower Control output

ON

ON

ON

ON

ON

ON

-

Front blower motor OFF

Front blower motor ON

Fan switch OFF

Fan switch ON

-

-

-

Voltage (V)

(Approx.)

0 - 5V

Battery voltage

0V

0 - 5V

0 - 5V

5V

0V

0 - 5V

PIIA2344E

Revision: October 2004

MTC-44

2005 Titan

TROUBLE DIAGNOSIS

A/C System Self-diagnosis Function (With NAVI Only)

DESCRIPTION

EJS003U2

The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. Refer to applicable sections

(items) for details. Fault codes (if any are present) will be displayed in the ambient temperature display area.

Refer to

MTC-46, "SELF-DIAGNOSIS CODE CHART"

.

A

B

C

D

E

WJIA1414E

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-45

2005 Titan

TROUBLE DIAGNOSIS

SELF-DIAGNOSIS CODE CHART

Code No.

03 Battery voltage out of range

20

21

22

56

57

62

80

82

90

92

BCM not responding to A/C request

BCM not responding to rear defroster request

Air mix door motor (Front) circuit failure

Intake sensor circuit short

Intake sensor circuit open

Defroster door motor circuit failure

CAN bus fault

Intake door motor (front) circuit malfunction

Stuck button

Mode door motor circuit failure

Reference page

SC-4, "BATTERY"

MTC-75, "DIAGNOSTIC PROCEDURE FOR MAGNET

CLUTCH"

GW-95, "REAR WINDOW DEFOGGER"

MTC-56, "Air Mix Door Motor Circuit"

MTC-92, "Intake Sensor Circuit"

MTC-63, "Defroster Door Motor Circuit"

LAN-7, "CAN COMMUNICATION"

MTC-62, "DIAGNOSTIC PROCEDURE FOR INTAKE DOOR

MOTOR"

MTC-95, "CONTROL UNIT"

MTC-52, "Mode Door Motor Circuit"

Revision: October 2004

MTC-46

2005 Titan

TROUBLE DIAGNOSIS

Operational Check

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

Conditions : Engine running and at normal operating temperature

CHECKING BLOWER

1.

Turn fan control switch clockwise. Blower should operate on low speed.

2.

Turn the fan control switch again, and continue checking blower speed and fan symbol until all speeds are checked.

3.

Leave blower on MAX speed.

If NG, go to

MTC-69, "DIAGNOSTIC PROCEDURE FOR BLOWER

MOTOR"

If OK, continue with next check.

CHECKING DISCHARGE AIR

1.

Turn the mode switch to each mode position.

2.

Confirm that discharge air comes out according to the air distribution table. Refer to

MTC-25, "Discharge Air Flow"

.

Mode door position is checked in the next step.

If NG, go to trouble diagnosis procedure for

MTC-52, "Mode Door

Motor Circuit"

.

If OK, continue with next check.

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh when the DEF or D/F is selected.

CHECKING RECIRCULATION

1.

Press recirculation ( tor should illuminate.

) switch one time. Recirculation indica-

2.

Press recirculation ( indicator should go off.

) switch one more time. Recirculation

3.

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

If NG, go to trouble diagnosis procedure for

MTC-60, "Intake Door

Motor Circuit"

.

If OK, continue with next check.

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh when the DEF, D/F or floor is selected.

Revision: October 2004

MTC-47

WJIA1428E

2005 Titan

EJS003U3

A

B

C

D

E

WJIA1426E

F

G

H

WJIA1427E

I

MTC

K

L

WJIA1297E

M

TROUBLE DIAGNOSIS

CHECKING TEMPERATURE DECREASE

1.

Rotate temperature control dial counterclockwise.

2.

Check for cold air at appropriate discharge air outlets.

If NG, listen for sound of air mix door motor operation if OK, go to trouble diagnosis procedure for

MTC-80, "Insufficient Cooling"

. If air mix door motor appears to be malfunctioning, go to

MTC-58, "DIAG-

NOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)"

.

If OK, continue with next check.

CHECKING TEMPERATURE INCREASE

1.

Rotate temperature control dial clockwise.

2.

Check for hot air at appropriate discharge air outlets.

If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for

MTC-87, "Insufficient Heating"

. If air mix door motor appears to be malfunctioning, go to

MTC-58, "DIAG-

NOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)"

.

If OK, continue with next check.

CHECK A/C SWITCH

1.

Press A/C switch with the fan switch ON.

2.

A/C switch indicator will turn ON.

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

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection).

If NG, go to trouble diagnosis procedure for

MTC-74, "Magnet Clutch

Circuit"

.

If OK, continue with next check.

WJIA1429E

WJIA1430E

WJIA1431E

Revision: October 2004

MTC-48

2005 Titan

TROUBLE DIAGNOSIS

Power Supply and Ground Circuit for Front Air Control

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

*1

MTC-49, "Power Supply and Ground

Circuit for Front Air Control"

.

*2

MTC-47, "Operational Check"

EJS003U5

A

B

C

D

E

F

G

H

I

WJIA1411E

MTC

K

L

M

Revision: October 2004

MTC-49

2005 Titan

TROUBLE DIAGNOSIS

COMPONENT DESCRIPTION

Front Air Control

The front air control has a built-in microcomputer which processes information sent from various sensors needed for air conditioner operation. The air mix door motor, mode door motor, intake door motor, defroster door motor, blower motor and compressor are then controlled.

The front air control is unitized with control mechanisms. When the various switches and temperature dial are operated, data is input to the front air control.

Self-diagnostic functions are also built into the front air control to provide quick check of malfunctions in the air conditioner system.

Potentio Temperature Control (PTC)

The PTC is built into the front air control. It can be set from cold to hot or any intermediate position by rotating the temperature dial.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

SYMPTOM: A/C system does not come on.

WJIA1412E

WJIA1413E

WJIA0414E

Revision: October 2004

MTC-50

2005 Titan

TROUBLE DIAGNOSIS

1.

CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL

1.

Disconnect front air control connector.

2.

Check voltage between front air control harness connector M49 terminals 14 (Y/G) and 22 (Y/R), and ground.

A

B

Terminals Ignition switch position

(+)

Front air control connector

Terminal No.

(Wire color)

(-) OFF ACC ON

M49 14 (Y/G) Approx. 0V Approx. 0V

Battery voltage

WJIA0415E

M49 22 (Y/R)

Ground

Battery voltage

Battery voltage

Battery voltage

OK or NG

OK

NG

>> GO TO 2.

>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to PG-77, "FUSE BLOCK-

JUNCTION BOX(J/B)" .

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

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

2.

CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Check continuity between front air control harness connector

M49 terminal 1 (B) and ground.

1 - Ground : Continuity should exist.

OK or NG

OK

NG

>> Replace front air control. Refer to

MTC-95, "CONTROL

UNIT"

.

>> Repair harness or connector.

C

D

E

F

G

H

I

MTC

K

WJIA1351E

L

M

Revision: October 2004

MTC-51

2005 Titan

TROUBLE DIAGNOSIS

Mode Door Motor Circuit

SYMPTOM:

Air outlet does not change.

Mode door motor does not operate normally.

INSPECTION FLOW

EJS003U6

*1

MTC-25, "Discharge Air Flow"

.

*2

MTC-47, "Operational Check"

.

*4

MTC-46, "SELF-DIAGNOSIS CODE

CHART" .

*5

MTC-53, "DIAGNOSTIC PROCE-

DURE FOR MODE DOOR

MOTOR"

.

WJIA1425E

*3

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)"

.

*6

MTC-33, "SYMPTOM TABLE"

Revision: October 2004

MTC-52

2005 Titan

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION

Component Parts

Mode door control system components are:

Front air control

Mode door motor

PBR (built into mode door motor)

System Operation

The mode door position (vent, B/L, foot, and defrost) is set by the front air control by means of the mode door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of the mode door motor while ground is applied to the other circuit, causing the mode door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied to it.

The front air control monitors the mode door position by measuring the voltage signal on the PBR circuit.

A

B

C

D

E

COMPONENT DESCRIPTION

Mode Door Motor

The mode door motor is attached to the heater & cooling unit. It rotates so that air is discharged from the outlet as indicated by the front air control. Motor rotation is conveyed to a link which activates the mode door.

F

G

H

WJIA0587E

DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR

1.

CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS

Self-diagnosis code 92 or DTC B2588 is present. Refer to

MTC-45, "A/C System Self-diagnosis Function

(With NAVI Only)"

.

YES or NO

YES >> GO TO 2.

NO >> GO TO 3.

2.

CHECK POWER SUPPLY AND GROUND CIRCUITS FOR MODE DOOR MOTOR

I

MTC

K

L

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and mode door motor connector.

3.

Check continuity between front air control harness connector

M49 terminal 5 (BR/W) and mode door motor harness connector

M142 terminal 5 (BR/W) and between front air control harness connector M49 terminal 6 (P/L) and mode door motor harness connector M142 terminal 6 (P/L).

5 - 5

6 - 6

: Continuity should exist.

: Continuity should exist.

OK or NG

OK

NG

>> Replace mode door motor. Refer to

MTC-106, "MODE DOOR MOTOR"

.

>> Repair or replace harness as necessary.

LJIA0027E

M

Revision: October 2004

MTC-53

2005 Titan

TROUBLE DIAGNOSIS

3.

CHECK PBR REFERENCE SIGNAL VOLTAGE

1.

Disconnect the mode door motor connector.

2.

Turn ignition switch ON.

3.

Check voltage between mode door motor harness connector

M142 terminal 3 (Y) and ground.

: Approx. 5V 3 - Ground

OK or NG

OK

NG

>> GO TO 5.

>> GO TO 4.

LJIA0028E

4.

CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN MODE DOOR AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between mode door motor harness connector

M142 terminal 3 (Y) and front air control harness connector M49 terminal 2 (Y).

3 - 2 : Continuity should exist.

OK or NG

OK

NG

>> Replace front air control. Refer to

MTC-95, "CONTROL

UNIT"

.

>> Repair or replace harness as necessary.

5.

CHECK PBR GROUND REFERENCE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between mode door motor harness connector

M142 terminal 1 (P) and front air control harness connector M49 terminal 15 (P).

1 - 15 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 6.

>> Repair or replace harness as necessary.

LJIA0029E

LJIA0031E

6.

CHECK PBR FEEDBACK SIGNAL

1.

Reconnect the front air control connector and mode door motor connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49 terminal 16 (GR) and ground.

4.

Press mode switch through all modes.

16 - Ground : Approx. 0 - 5V

OK or NG

OK

NG

>> Replace front air control. Refer to

MTC-95, "CONTROL

UNIT"

.

>> GO TO 7.

LJIA0032E

Revision: October 2004

MTC-54

2005 Titan

TROUBLE DIAGNOSIS

7.

CHECK PBR FEEDBACK CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the mode door motor connector and front air control harness connector.

3.

Check continuity between mode door motor harness connector

M142 terminal 2 (GR) and front air control harness connector

M49 terminal 16 (GR).

2 - 16 : Continuity should exist.

OK or NG

OK

NG

>> Replace mode door motor. Refer to

MTC-106, "MODE

DOOR MOTOR"

.

>> Repair or replace harness as necessary.

LJIA0034E

C

D

E

A

B

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-55

2005 Titan

TROUBLE DIAGNOSIS

Air Mix Door Motor Circuit

SYMPTOM:

Discharge air temperature does not change.

Air mix door motor does not operate.

INSPECTION FLOW

EJS003U7

*1

MTC-47, "Operational Check" .

*4

MTC-58, "DIAGNOSTIC PROCE-

DURE FOR AIR MIX DOOR

MOTOR (FRONT)"

.

*2

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)" .

WJIA1432E

*3

MTC-46, "SELF-DIAGNOSIS CODE

CHART" .

Revision: October 2004

MTC-56

2005 Titan

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:

Front air control

Air mix door motors (Front)

PBR (built-into air mix motors)

System Operation

The front air control receives data from the temperature selected by the driver. The front air control then applies a voltage to one circuit of the appropriate air mix door motor, while ground is applied to the other circuit, causing the appropriate air mix door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied to it. The front air control monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.

A

B

C

D

E

Air Mix Door Control Specification

COMPONENT DESCRIPTION

Air Mix Door Motors

F

G

The front air mix door motor is attached to the front heater & cooling unit. This motor rotates so that the air mix door is opened or closed to a position set by the front air control. Motor rotation is then conveyed through a shaft and the air mix door position is then fed back to the front air control by the PBR built into the air mix door motors.

WJIA0435E

H

I

MTC

K

WJIA1417E

L

M

Revision: October 2004

MTC-57

2005 Titan

TROUBLE DIAGNOSIS

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)

1.

CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS

Self-diagnosis code 22 or DTC B2577 is present. Refer to

MTC-45, "A/C System Self-diagnosis Function

(With NAVI Only)"

.

YES or NO

YES >> GO TO 2.

NO >> GO TO 3.

2.

CHECK POWER SUPPLY CIRCUITS FOR AIR MIX DOOR MOTOR (FRONT)

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and air mix door motor

(front) connector.

3.

Check continuity between front air control harness connector

M49 terminal 3 (W/G) and 4 (G) and air mix door motor (front) harness connector M147 terminal 1 (W/G) and 6 (G).

3 - 1

4 - 6

: Continuity should exist.

: Continuity should exist.

OK or NG

OK

NG

>> Replace air mix door motor (front). Refer to

MTC-107,

"AIR MIX DOOR MOTOR"

.

>> Repair or replace harness as necessary.

3.

CHECK PBR REFERENCE SIGNAL VOLTAGE

1.

Turn ignition switch OFF.

2.

Disconnect the air mix door motor (front) connector.

3.

Turn ignition switch ON.

4.

Check voltage between air mix door motor (front) harness connector M147 terminal 3 (Y) and ground.

WJIA1418E

3 - Ground : Approx. 5V

OK or NG

OK

NG

>> GO TO 5.

>> GO TO 4.

WJIA1419E

4.

CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR MOTOR (FRONT) AND

FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between air mix door motor (front) harness connector M147 terminal 3 (Y) and front air control harness connector M49 terminal 2 (Y).

3 - 2 : Continuity should exist.

OK or NG

OK

NG

>> Replace front air control. Refer to

MTC-95, "CONTROL

UNIT"

.

>> Repair or replace harness as necessary.

WJIA1420E

Revision: October 2004

MTC-58

2005 Titan

TROUBLE DIAGNOSIS

5.

CHECK PBR GROUND REFERENCE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between air mix door motor (front) harness connector M147 terminal 2 (P) and front air control harness connector M49 terminal 15 (P).

2 - 15 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 6.

>> Repair or replace harness as necessary.

6.

CHECK PBR FEEDBACK SIGNAL

1.

Reconnect the front air control connector and air mix door motor

(Front) connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49 terminal 18 (SB) and ground.

4.

Rotate Front temperature control dial through complete range.

18 - Ground : Approx. 0V - 5V

OK or NG

OK

NG

>> Replace front air control. Refer to

MTC-95, "CONTROL

UNIT"

.

>> GO TO 7.

7.

CHECK PBR FEEDBACK CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the air mix door motor (front) connector and front air control connector.

3.

Check continuity between air mix door motor (front) harness connector M147 terminal 4 (SB) and front air control harness connector M49 terminal 18 (SB).

4 - 18 Continuity should exist.

OK or NG

OK

NG

>> Replace air mix door motor (Front). Refer to

MTC-107,

"AIR MIX DOOR MOTOR"

.

>> Repair or replace harness as necessary.

WJIA1421E

C

D

E

A

B

F

G

H

LJIA0041E

I

MTC

K

L

WJIA1422E

M

Revision: October 2004

MTC-59

2005 Titan

TROUBLE DIAGNOSIS

Intake Door Motor Circuit

SYMPTOM:

Intake door does not change.

Intake door motor does not operate normally.

INSPECTION FLOW

EJS003U8

*1

MTC-47, "Operational Check"

.

*2

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)"

.

WJIA1433E

*3

MTC-46, "SELF-DIAGNOSIS CODE

CHART" .

Revision: October 2004

MTC-60

2005 Titan

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION

Component Parts

Intake door control system components are:

Front air control

Intake door motor

System Operation

The intake door control determines the intake door positions based on the position of the recirculation switch.

When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the opposite direction, again allowing fresh air into the cabin.

Intake Doors Control Specification

A

B

C

D

E

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 front air control. Motor rotation is conveyed to a lever which activates the intake door.

WJIA0436E

F

G

H

I

MTC

K

WJIA0552E

L

M

Revision: October 2004

MTC-61

2005 Titan

TROUBLE DIAGNOSIS

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

1.

CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS

Self-diagnosis code 82 or DTC B2586 is present. Refer to

MTC-45, "A/C System Self-diagnosis Function

(With NAVI Only)"

.

YES or NO

YES >> GO TO 2.

NO >> Replace front air control. Refer to

MTC-95, "CONTROL UNIT"

.

2.

CHECK POWER SUPPLY CIRCUIT FOR INTAKE DOOR MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and intake door motor connector.

3.

Check continuity between front air control harness connector

M49 terminal 7 (O) and intake door motor harness connector

M58 terminal 1 (O) and between front air control harness connector M49 terminal 8 (G/B) and intake door motor harness connector M58 terminal 6 (G/B).

7 - 1

8 - 6

Continuity should exist.

Continuity should exist.

OK or NG

OK

NG

>> Replace intake door motor. Refer to

MTC-105, "INTAKE DOOR MOTOR"

.

>> Repair or replace harness as necessary.

WJIA0591E

Revision: October 2004

MTC-62

2005 Titan

Defroster Door Motor Circuit

SYMPTOM:

Defroster door does not change.

Defroster door motor does not operate normally.

INSPECTION FLOW

TROUBLE DIAGNOSIS

*1

MTC-47, "Operational Check"

.

*2

MTC-45, "A/C System Self-diagnosis

Function (With NAVI Only)" .

*3

WJIA1423E

MTC-46, "SELF-DIAGNOSIS CODE

CHART" .

EJS003U9

A

B

C

D

E

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-63

2005 Titan

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION

Component Parts

Defroster door control system components are:

Front air control

Defroster door motor

System Operation

The front air control determines defroster door position based on the position of the mode switch. When the mode switch is in the defroster position, the defroster door motor rotates directing air to the defroster ducts.

When any mode other than defroster is selected, the defroster motor rotates in the opposite direction closing off air flow to the defroster ducts.

COMPONENT DESCRIPTION

Defroster door motor

The defroster door motor is attached to the front heater & cooling unit. The front air control sends a voltage to rotate the defroster door directing the air flow either to the defroster ducts, or to the floor ducts, depending on which way the voltage and ground are applied to the motor leads. Motor rotation is conveyed to a lever which activates the defroster door.

WJIA0592E

DIAGNOSTIC PROCEDURE FOR DEFROSTER DOOR MOTOR

1.

CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS

Self-diagnosis code 62 or DTC B2583 is present. Refer to

MTC-45, "A/C System Self-diagnosis Function

(With NAVI Only)"

.

YES or NO

YES >> GO TO 2.

NO >> GO TO 3.

2.

CHECK POWER SUPPLY CIRCUIT FOR DEFROSTER DOOR MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and defroster door motor connector.

3.

Check continuity between front air control harness connector

M49 terminal 19 (LG) and defroster door motor connector M144 terminal 1 (LG) and between front air control harness connector

M49 terminal 20 (P/B) and defroster door motor connector M144 terminal 6 (P/B).

19 - 1

20 - 6

: Continuity should exist.

: Continuity should exist.

OK or NG

OK

NG

>> Replace defroster door motor. Refer to

MTC-104, "DEFROSTER DOOR MOTOR"

.

>> Repair or replace harness as necessary.

WJIA0553E

Revision: October 2004

MTC-64

2005 Titan

TROUBLE DIAGNOSIS

3.

CHECK PBR REFERENCE SIGNAL VOLTAGE

1.

Disconnect the defroster door motor harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between defroster door motor harness connector

M144 terminal 3 (Y) and ground.

: Approx. 5V.

3 - Ground

OK or NG

OK

NG

>> GO TO 5.

>> GO TO 4.

A

B

C

D

WJIA0554E

4.

CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN DEFROSTER DOOR MOTOR AND FRONT

AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between defroster door motor harness connector M144 terminal 3 (Y) and front air control harness connector

M49 terminal 2 (Y).

3 - 2 : Continuity should exist.

OK or NG

OK

NG

>> Replace front air control. Refer to

MTC-95, "CONTROL

UNIT"

.

>> Repair or replace harness as necessary.

5.

CHECK PBR GROUND REFERENCE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between defroster door motor harness connector M144 terminal 2 (P) and front air control harness connector

M49 terminal 15 (P).

WJIA0555E

2 - 15 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 6.

>> Repair or replace harness as necessary.

E

F

G

H

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MTC

K

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WJIA0556E

6.

CHECK PBR FEEDBACK SIGNAL

1.

Reconnect the front air control connector and defroster door motor connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49 terminal 25 (LG/B) and ground.

4.

Change mode between floor, defroster, and panel.

25 - Ground : Approx.0 - 5V

OK or NG

OK

NG

>> Replace front air control. Refer to

MTC-95, "CONTROL

UNIT"

.

>> GO TO 7.

WJIA0557E

Revision: October 2004

MTC-65

2005 Titan

TROUBLE DIAGNOSIS

7.

CHECK PBR FEEDBACK CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the defroster door motor connector and front air control connector.

3.

Check continuity between defroster door motor harness connector M144 terminal 4 (LG/B) and front air control harness connector M49 terminal 25 (LG/B).

4 - 25 : Continuity should exist.

OK or NG

OK

NG

>> Replace defroster door motor. Refer to

MTC-104,

"DEFROSTER DOOR MOTOR"

.

>> Repair or replace harness as necessary.

WJIA0558E

Revision: October 2004

MTC-66

2005 Titan

Front Blower Motor Circuit

SYMPTOM:

Blower motor operation is malfunctioning.

Blower motor operation is malfunctioning under cold starting conditions.

INSPECTION FLOW

TROUBLE DIAGNOSIS

*1

.

MTC-47, "Operational Check"

.

*4

MTC-69, "DIAGNOSTIC PROCE-

DURE FOR BLOWER MOTOR" .

*2

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)"

.

*5 EC-192, "DTC P0117, P0118 ECT

SENSOR"EC-205, "DTC P0125

ECT SENSOR"

WJIA1451E

*3

MTC-46, "SELF-DIAGNOSIS CODE

CHART"

.

Revision: October 2004

MTC-67

2005 Titan

EJS003UA

A

B

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SYSTEM DESCRIPTION

Component Parts

Front air control

Front blower switch

Variable blower control

Front blower motor

Front blower motor relay

System Operation

TROUBLE DIAGNOSIS

COMPONENT DESCRIPTION

Variable Blower Control

The variable blower control is located on the cooling unit. The variable blower control receives a gate voltage from the front air control to steplessly maintain the blower motor voltage in the 0 to 5 volt range (approx.).

WJIA1385E

WJIA0559E

Revision: October 2004

MTC-68

2005 Titan

TROUBLE DIAGNOSIS

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR

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

F

G

WJIA1386E

1.

CHECK FUSES

H

Check 20A fuses [No. 24 and 27 (Located in the fuse and fusible link box)]. For fuse layout. Refer to PG-78,

"FUSE AND FUSIBLE LINK BOX" .

Fuses are good.

OK or NG

OK

NG

>> GO TO 2.

>> GO TO 10.

2.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT

I

MTC

K

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor connector.

3.

Press the mode switch to select any mode except off.

4.

Turn the front blower control dial to high.

5.

Check voltage between front blower motor harness connector

M62 terminal 2 (W/L) and ground.

L

M

2 - Ground

OK or NG

OK

NG

>> GO TO 12.

>> GO TO 3.

: Battery voltage.

WJIA0593E

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D

E

A

B

Revision: October 2004

MTC-69

2005 Titan

TROUBLE DIAGNOSIS

3.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor relay.

3.

Turn ignition switch ON.

4.

Check voltage between front blower motor relay harness connector M107 terminals 5 (GR) and ground.

5 - Ground : Battery voltage.

OK or NG

OK

NG

>> GO TO 4.

>> Repair harness or connector.

4.

CHECK FRONT BLOWER MOTOR RELAY

Turn ignition switch OFF.

Refer to

MTC-73, "Front Blower Motor Relay"

.

OK or NG

OK

NG

>> GO TO 5.

>> Replace front blower motor relay.

5.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN

Check continuity between front blower motor relay harness connector M107 terminal 3 (W/L) and front blower motor harness connector

M62 terminal 2 (W/L).

3 - 2 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 6.

>> Repair harness or connector.

WJIA1359E

WJIA1360E

6.

CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN

1.

Disconnect variable blower control harness connector.

2.

Check continuity between front blower motor relay harness connector M107 terminals 3 (W/L) and variable blower control harness connector M122 terminal 1 (W/L).

3 - 1 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 7.

>> Repair harness or connector.

WJIA1361E

Revision: October 2004

MTC-70

2005 Titan

TROUBLE DIAGNOSIS

7.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1.

Disconnect front air control connector.

2.

Check continuity between front air control harness connector

M49 terminal 40 (G/R) and variable blower control harness connector M122 terminal 2 (G/R).

40 - 2 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 8.

>> Repair harness or connector.

8.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY

1.

Turn ignition switch ON.

2.

Check voltage between front blower motor relay harness connector M107 terminal 2 (Y/G) and ground.

2 - Ground : Battery voltage.

OK or NG

OK

NG

>> GO TO 9.

>> Repair harness or connector.

9.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between front blower motor relay connector

M107 terminal 1 (R/B) and front air control harness connector

M49 terminal 26 (R/B).

1 - 26 : Continuity should exist.

OK or NG

OK

NG

>> Replace front air control. Refer to

MTC-95, "CONTROL

UNIT"

.

>> Repair harness or connector.

10.

REPLACE FUSES

1.

Replace fuses.

2.

Activate the front blower motor.

3.

Do fuses blow?

YES or NO

YES >> GO TO 11.

NO >> Inspection End.

WJIA1387E

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M

Revision: October 2004

MTC-71

2005 Titan

TROUBLE DIAGNOSIS

11.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor connector and variable blower control connector.

3.

Check continuity between variable blower control harness connector M122 terminal 1 (W/L) and ground.

1 - Ground.

: Continuity should not exist.

OK or NG

OK

NG

>> GO TO 12.

>> Repair harness or connector.

12.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1.

Disconnect front air control connector.

2.

Check continuity between front air control harness connector

M49 terminal 40 (G/R) and variable blower control harness connector M122 terminal 2 (G/R).

40 - 2 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 13.

>> Repair harness or connector.

13.

CHECK FRONT BLOWER MOTOR

Refer to

MTC-97, "BLOWER MOTOR"

.

OK or NG

OK

NG

>> GO TO 14.

>> Replace front blower motor. Refer to

MTC-97, "BLOWER MOTOR"

.

14.

CHECK BLOWER MOTOR GROUND CIRCUIT

Check continuity between front blower motor harness connector

M62 terminal 1 (L/W) and variable blower control harness connector

M122 terminal 3 (L/W).

1 - 3 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 15.

>> Repair harness or connector.

WJIA1365E

WJIA1387E

WJIA1367E

Revision: October 2004

MTC-72

2005 Titan

TROUBLE DIAGNOSIS

15.

CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT

Check continuity between variable blower control harness connector

M122 terminal 4 (B/W) and ground.

4 - ground : Continuity should exist.

OK or NG

OK

NG

>> Replace variable blower control. Refer to

MTC-108,

"VARIABLE BLOWER CONTROL"

.

>> Repair harness or connector.

COMPONENT INSPECTION

Front Blower Motor Relay

Check continuity between terminals by supplying 12 volts and ground to coil side terminals of relay.

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.

Revision: October 2004

MTC-73

WJIA1368E

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D

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A

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WJIA1401E

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MTC

F

G

H

WJIA1265E

2005 Titan

TROUBLE DIAGNOSIS

Magnet Clutch Circuit

SYMPTOM: Magnet clutch does not engage.

INSPECTION FLOW

EJS003UD

*1

MTC-47, "Operational Check" .

*4

MTC-92, "Intake Sensor Circuit" .

*2

MTC-45, "A/C System Self-diagnosis

Function (With NAVI Only)"

.

WJIA1435E

*3

MTC-46, "SELF-DIAGNOSIS CODE

CHART"

.

Revision: October 2004

MTC-74

2005 Titan

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION

The front air control controls compressor operation based on ambient and intake temperature and a signal from ECM.

Low Temperature Protection Control

The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sensor.

When intake air temperature is higher than the preset value, the compressor turns ON. The compressor turns

OFF when intake air temperature is lower than the preset value.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

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

A

B

C

D

E

I

1.

CHECK INTAKE SENSOR CIRCUITS

Check intake sensor. Refer to

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)"

.

OK or NG

OK

NG

>> GO TO 2.

>> Malfunctioning intake sensor. Refer to

MTC-92, "Intake Sensor Circuit"

.

2.

PERFORM AUTO ACTIVE TEST

Refer to PG-22, "Auto Active Test" .

Does magnet clutch operate?

YES or NO

YES >>

WITH CONSULT-II

GO TO 5.

NO

WITHOUT CONSULT-II

GO TO 6.

>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.

WJIA1392E

MTC

K

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H

Revision: October 2004

MTC-75

2005 Titan

TROUBLE DIAGNOSIS

3.

CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R connector and A/C compressor (magnet clutch) connector.

3.

Check continuity between IPDM E/R harness connector E119 terminal 11 (Y/B) and A/C compressor harness connector F3 terminal 1 (Y/B).

11 – 1 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 4.

>> Repair harness or connector.

4.

CHECK MAGNET CLUTCH CIRCUIT

Check for operation sound when applying battery voltage to terminal

1 of A/C compressor.

OK or NG

OK

NG

>> Replace IPDM E/R. Refer to PG-28, "Removal and

Installation of IPDM E/R" .

>> Replace magnet clutch. Refer to

MTC-116, "Removal and Installation for Compressor Clutch"

.

5.

CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

Check compressor ON/OFF signal. Refer to

MTC-31, "CONSULT-II

Function (BCM)"

.

A/C SW ON

A/C SW OFF

: COMP ON SIG ON

: COMP ON SIG OFF

OK or NG

OK

NG

>> GO TO 8.

>> GO TO 6.

6.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector and front air control connector.

3.

Check continuity between BCM harness connector M18 terminal

27 (W/R) and front air control harness connector M49 terminal

12 (W/R).

27 - 12 Continuity should exist.

OK or NG

OK

NG

>> GO TO 7.

>> Repair harness or connector.

Revision: October 2004

MTC-76

WJIA0560E

WJIA1452E

WJIA0469E

WJIA1443E

2005 Titan

TROUBLE DIAGNOSIS

7.

CHECK VOLTAGE FOR FRONT AIR CONTROL (COMPRESSOR ON SIGNAL)

1.

Reconnect BCM connector and front air control connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49 terminal 12 (W/R) and ground.

A

B

Terminals

(+)

Terminal No.

(Wire color)

(-)

Condition Voltage

Front air control connector

WJIA0449E

A/C switch: ON Approx. 0V

M49 12 (W/R) Ground

A/C switch: OFF Approx. 5V

OK or NG

OK >> GO TO 8.

NG-1 >> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to

MTC-95,

"CONTROL UNIT"

.

NG-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to BCS-19, "Removal and Installation of BCM" .

8.

CHECK REFRIGERANT PRESSURE SENSOR

WITH CONSULT-II

1.

Start engine.

2.

Check voltage of refrigerant pressure sensor. Refer to

MTC-28, "CONSULT-II Function (HVAC)"

.

WITHOUT CONSULT-II

1.

Start engine.

2.

Check voltage between ECM harness connector F54 terminal

70 (B/W) and ground.

(+)

Terminals

Condition Voltage

ECM connector

F54

Terminal No.

(Wire color)

70 (B/W)

(-)

Ground A/C switch: ON Approx. 0.36 - 3.88V

OK or NG

OK >>

WITH CONSULT-II

GO TO 9.

NG

WITHOUT CONSULT-II

GO TO 10.

>> Refer to EC-620, "REFRIGERANT PRESSURE SENSOR" .

LJIA0124E

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Revision: October 2004

MTC-77

2005 Titan

TROUBLE DIAGNOSIS

9.

CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to

MTC-31, "CONSULT-II Function (BCM)"

.

: FAN ON SIG ON FRONT BLOWER CONTROL

DIAL ON

FRONT BLOWER CONTROL

DIAL OFF

: FAN ON SIG OFF

OK or NG

OK

NG

>> GO TO 12.

>> GO TO 10.

WJIA0469E

10.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector and front air control connector.

3.

Check continuity between BCM harness connector M18 terminal

28 (L/R) and front air control harness connector M50 terminal 36

(L/R).

28 - 36 Continuity should exist.

OK or NG

OK

NG

>> GO TO 11.

>> Repair harness or connector.

11.

CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)

1.

Reconnect BCM connector and front air control connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49 terminal 36 (L/R) and ground.

WJIA1393E

Terminals

(+)

Condition Voltage

Front air control connector

Terminal No.

(Wire color)

(-)

M50 36 (L/R) Ground

A/C switch: ON

Blower motor operates

Approx. 0V

A/C switch: OFF Approx. 5V

WJIA1394E

OK or NG

OK >> GO TO 12.

NG-1 >> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to

MTC-95,

"CONTROL UNIT"

.

NG-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to BCS-19, "Removal and Installation of BCM" .

Revision: October 2004

MTC-78

2005 Titan

TROUBLE DIAGNOSIS

12.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to LAN-7, "CAN COMMUNICATION" .

BCM – ECM

ECM – IPDM E/R

ECM – Front air control

OK or NG

OK

NG

>> Inspection End.

>> Repair or replace malfunctioning part(s).

COMPONENT INSPECTION

Refrigerant Pressure Sensor

The refrigerant pressure sensor is attached to the condenser.

F

G

WJIA1444E

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B

Revision: October 2004

MTC-79

2005 Titan

Insufficient Cooling

SYMPTOM: Insufficient cooling

INSPECTION FLOW

TROUBLE DIAGNOSIS

EJS003UE

*1 .

MTC-47, "Operational Check"

.

*4 EC-436, "DTC P1217 ENGINE

OVER TEMPERATURE" .

*7

MTC-83, "Test Reading"

WJIA1436E

*2

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)" .

*5

MTC-4, "Contaminated Refrigerant" .

*6 .

MTC-81, "PERFORMANCE TEST

DIAGNOSES"

*8 EM-12, "Checking Drive Belts"

*3

MTC-46, "SELF-DIAGNOSIS CODE

CHART"

.

Revision: October 2004

MTC-80

2005 Titan

TROUBLE DIAGNOSIS

PERFORMANCE TEST DIAGNOSES

*1

MTC-83, "PERFORMANCE

CHART" .

*4

MTC-56, "Air Mix Door Motor Circuit" .

*2

MTC-83, "PERFORMANCE

CHART"

.

WJIA0533E

*3

MTC-84, "Trouble Diagnoses for

Unusual Pressure"

.

Revision: October 2004

MTC-81

2005 Titan

F

G

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MTC

K

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D

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TROUBLE DIAGNOSIS

*1

MTC-116, "Removal and Installation for Compressor Clutch" .

*2

MTC-67, "Front Blower Motor Circuit" .

WJIA1371E

*3 EM-12, "Checking Drive Belts" .

Revision: October 2004

MTC-82

2005 Titan

TROUBLE DIAGNOSIS

PERFORMANCE CHART

Test Condition

Testing must be performed as follows:

Doors

Door window

Hood

TEMP.

Vehicle location

Closed

Open

Open

Max. COLD

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

Mode switch

(Ventilation) set

Recirculation (REC) switch

(Recirculation) set

Blower speed

Engine speed

Max. speed set

Idle speed

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

Test Reading

Recirculating-to-discharge Air Temperature Table

Inside air (Recirculating air) at blower assembly inlet

Relative humidity

%

Air temperature

°

C (

°

F)

50 - 60

20 (68)

25 (77)

30 (86)

60 - 70

35 (95)

40 (104)

20 (68)

25 (77)

30 (86)

35 (95)

40 (104)

Discharge air temperature at center ventilator

°

C (

°

F)

5.3 - 6.5 (42 - 44)

9.7 - 11.5 (49 - 53)

13.8 - 16.3 (57 - 61)

18.0 - 21.2 (64 - 70)

22.2 - 25.7 (72 - 78)

6.5 - 7.7 (44 - 46)

11.5 - 13.3 (53 - 56)

16.3 - 18.8 (61 - 66)

21.2 - 24.0 (70 - 75)

25.7 - 29.2 (78 - 85)

Ambient Air Temperature-to-operating Pressure Table

Relative humidity

%

Ambient air

Air temperature

°

C (

°

F)

High-pressure (Discharge side) kPa (kg/cm

2

, psi)

50 - 70

20 (68)

25 (77)

30 (86)

35 (95)

40 (104)

680 - 840

(6.94 - 8.57, 98.6 - 121.8)

800 - 985

(8.16 - 10.05, 116.0 - 142.8)

940 - 1,150

(9.59 - 11.73, 136.3 - 166.8)

1,160 - 1,410

(11.83 - 14.38, 168.2 - 204.5)

1,325 - 1,620

(13.52 - 16.52, 192.1 - 234.9)

Low-pressure (Suction side) kPa (kg/cm

2

, 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)

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Revision: October 2004

MTC-83

2005 Titan

TROUBLE DIAGNOSIS

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

Gauge indication Refrigerant cycle

Pressure is reduced soon after water is splashed on condenser.

Probable cause

Excessive refrigerant charge in refrigeration cycle

Air suction by cooling fan is insufficient.

Insufficient condenser cooling performance

1. Condenser fins are clogged.

2. Improper fan rotation of cooling fan

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

Low-pressure pipe is not cold.

When compressor is stopped high-pressure value quickly drops by approximately 196 kPa (2 kg/cm

2

, 28 psi). It then decreases gradually thereafter.

Poor heat exchange in condenser

(After compressor operation stops, high-pressure decreases too slowly.)

Air in refrigeration cycle

Corrective action

Reduce refrigerant until specified pressure is obtained.

Clean condenser.

Check and repair cooling fan if necessary.

Evacuate repeatedly and recharge system.

AC359A

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.

Engine cooling systems malfunction.

Excessive liquid refrigerant on low-pressure side

Excessive refrigerant discharge flow

Expansion valve is open a little compared with the specification.

Improper expansion valve adjustment

Check and repair engine cooling system.

Replace expansion valve.

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

Refrigerant cycle Probable cause Gauge indication

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

Corrective action

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

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

Check and repair or replace malfunctioning parts.

Check lubricant for contamination.

AC360A

Revision: October 2004

MTC-84

2005 Titan

TROUBLE DIAGNOSIS

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

Gauge indication Refrigerant cycle

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.

Probable cause

Compressor pressure operation is improper.

Damaged inside compressor packings.

Compressor pressure operation is improper.

Damaged inside compressor packings.

Corrective action

Replace compressor.

Replace compressor.

Both High- and Low-pressure Sides are Too Low

Gauge indication Refrigerant cycle

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 expansion 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.

Probable cause

Liquid tank inside is slightly clogged.

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

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

AC353A

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.

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.

Corrective action

Replace liquid tank.

Check lubricant for contamination.

Check and repair malfunctioning parts.

Check lubricant for contamination.

Check refrigerant system for leaks. Refer to

MTC-123,

"Checking for Refrigerant

Leaks"

.

Remove foreign particles by using compressed air.

Check lubricant for contamination.

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

Air flow volume is too low.

Low-pressure pipe is clogged or crushed.

Evaporator is frozen.

Check and repair malfunctioning parts.

Check lubricant for contamination.

Check intake sensor circuit.

Refer to

MTC-92, "Intake

Sensor Circuit"

.

Repair evaporator fins.

Replace evaporator.

Refer to

MTC-67, "Front

Blower Motor Circuit"

.

A

B

C

D

E

F

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MTC

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Revision: October 2004

MTC-85

2005 Titan

TROUBLE DIAGNOSIS

Low-pressure Side Sometimes Becomes Negative

Refrigerant cycle Gauge indication

Low-pressure side sometimes becomes negative.

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

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

Probable cause

Refrigerant does not discharge cyclically.

Moisture is frozen at expansion valve outlet and inlet.

Water is mixed with refrigerant.

AC354A

Low-pressure Side Becomes Negative

Gauge indication Refrigerant cycle Probable cause

Low-pressure side becomes negative.

AC362A

Corrective action

Drain water from refrigerant or replace refrigerant.

Replace liquid tank.

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.

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 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 lubricant for contamination.

Revision: October 2004

MTC-86

2005 Titan

Insufficient Heating

SYMPTOM: Insufficient heating

INSPECTION FLOW

TROUBLE DIAGNOSIS

*1

.

MTC-47, "Operational Check"

*4

MTC-46, "SELF-DIAGNOSIS CODE

CHART"

.

*2

MTC-56, "Air Mix Door Motor Circuit" .

*5

MTC-67, "Front Blower Motor Circuit" .

*7 CO-10, "Changing Engine Coolant" .

*8 CO-11, "REFILLING ENGINE

COOLANT" .

*10 CO-6, "OVERHEATING CAUSE

ANALYSIS"

WJIA1437E

*3

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)"

.

*6 EC-192, "DTC P0117, P0118 ECT

SENSOR" .

*9

MTC-90, "Water Valve Circuit"

Revision: October 2004

MTC-87

2005 Titan

EJS003UF

A

B

C

D

E

F

G

H

I

MTC

K

L

M

Noise

SYMPTOM: Noise

INSPECTION FLOW

TROUBLE DIAGNOSIS

EJS003UG

*1

MTC-116, "Removal and Installation for Compressor Clutch" .

*4

MTC-47, "Operational Check" .

*2

MTC-117, "Clutch Disc" .

*5 EM-12, "Checking Drive Belts" .

Revision: October 2004

MTC-88

WJIA0473E

*3

MTC-20, "Maintenance of Lubricant

Quantity in Compressor"

.

2005 Titan

Self-diagnosis

SYMPTOM: Self-diagnosis cannot be performed.

INSPECTION FLOW

TROUBLE DIAGNOSIS

EJS003UH

A

B

C

D

E

*1

MTC-49, "Power Supply and Ground

Circuit for Front Air Control"

.

*4

MTC-47, "Operational Check"

.

*2

MTC-92, "Intake Sensor Circuit" .

*5

MTC-33, "SYMPTOM TABLE"

.

WJIA1438E

*3

MTC-56, "Air Mix Door Motor Circuit" .

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-89

2005 Titan

TROUBLE DIAGNOSIS

Water Valve Circuit

COMPONENT DESCRIPTION

Water Valve

The water valve cuts the flow of engine coolant to the front heater cores to allow for maximum cooling during A/C operation. It is controlled by the front air control through the water valve relay.

DIAGNOSTIC PROCEDURE FOR WATER VALVE

1.

CHECK WATER VALVE RELAY POWER INPUT CIRCUITS

1.

Turn ignition switch OFF.

2.

Disconnect water valve relay connector M7.

3.

Check voltage between water valve relay harness connector terminals and ground.

Terminals Ignition switch position

(+)

Water valve relay connector

Terminal No.

(Wire color)

(-) OFF

M7

2 (Y/R)

3 (Y/G)

Ground

Battery voltage

0V

OK or NG

OK

NG

>> GO TO 2.

>> Repair harness or connector.

ON

Battery voltage

Battery voltage

2.

CHECK WATER VALVE CONTROL

1.

Turn ignition switch ON.

2.

Select MAX A/C with mode switch.

3.

Check continuity between water valve relay harness connector

M7 terminal 1 (W/G) and ground, as MAX A/C is switched OFF and ON.

Terminals

Water valve relay connector

(+)

Terminal No.

(Wire color)

(-)

Condition Continuity

M7 1 (W/G) Ground

MAX A/C: ON

MAX A/C: OFF

Yes

No

OK or NG

OK

NG

>> GO TO 4.

>> GO TO 3.

Revision: October 2004

MTC-90

EJS003UI

WJIA1015E

WJIA0900E

WJIA0901E

2005 Titan

TROUBLE DIAGNOSIS

3.

CHECK WATER VALVE CONTROL OUTPUT CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector M49.

3.

Check continuity between water valve relay harness connector

M7 terminal 1 (W/G) and front air control harness connector

M49 terminal 10 (W/G).

1 - 10 : Continuity should exist.

4.

Check continuity between water valve relay harness connector

M7 terminal 1 (W/G) and ground.

1 - Ground : Continuity should not exist.

OK or NG

OK

NG

>> Replace front air control. Refer to

MTC-95, "CONTROL UNIT"

.

>> Repair harness or connector.

4.

CHECK WATER VALVE RELAY

Check water valve relay. Refer to

MTC-92, "Water Valve Relay"

.

OK or NG

OK

NG

>> GO TO 5.

>> Replace water valve relay.

5.

CHECK WATER VALVE GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect water valve connector F68.

3.

Check continuity between water valve harness connector F68 terminal - (B) and ground.

(-) - Ground : Continuity should exist.

OK or NG

OK

NG

>> GO TO 6.

>> Repair harness or connector.

6.

CHECK WATER VALVE POWER CIRCUIT

1.

Check continuity between water valve relay connector M7 terminal 5 (Y/L) and water valve connector F68 terminal + (Y/L)

5 - (+) : Continuity should exist.

2.

Check continuity between water valve relay harness connector

M7 terminal 5 (Y/L) and ground.

5 - Ground : Continuity should not exist.

OK or NG

OK

NG

>> Replace water valve.

>> Repair harness or connector.

Revision: October 2004

MTC-91

WJIA0903E

2005 Titan

WJIA1014E

C

D

E

A

B

K

WJIA1373E

L

M

F

G

H

I

MTC

TROUBLE DIAGNOSIS

COMPONENT INSPECTION

Water Valve Relay

Check continuity between terminals by supplying 12 volts and ground to coil side terminals of relay.

Intake Sensor Circuit

COMPONENT DESCRIPTION

Intake Sensor

The intake sensor is located on the heater & cooling unit. It converts temperature of air after it passes through the evaporator into a resistance value which is then input to the front air control.

DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR

SYMPTOM: Intake sensor circuit is open or shorted. (56, 57 or DTC

B2581, B2582 is indicated on front air control as a result of conducting Self-diagnosis).

1.

CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND

1.

Disconnect intake sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between intake sensor harness connector M146 terminal 2 (L/B) and ground.

: Approx. 5V 2 - Ground

OK or NG

OK

NG

>> GO TO 2.

>> GO TO 4.

Revision: October 2004

MTC-92

LHA160

EJS003UJ

WJIA0571E

WJIA0464E

WJIA1375E

2005 Titan

TROUBLE DIAGNOSIS

2.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector.

3.

Check continuity between intake sensor harness connector

M146 terminal 1 (V/R) and front air control harness connector

M49 terminal 21 (V/R).

1 - 21 : Continuity should exist.

OK or NG

OK

NG

>> GO TO 3.

>> Repair harness or connector.

A

B

C

D

WJIA1376E

3.

CHECK INTAKE SENSOR

E

Refer to

MTC-92, "Intake Sensor Circuit"

.

OK or NG

OK >> 1. Replace front air control. Refer to

MTC-95, "CONTROL UNIT"

.

NG

2. Go to self-diagnosis

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)"

and perform self-diagnosis.

>> 1. Replace intake sensor. Refer to

MTC-96, "INTAKE SENSOR"

.

2. Go to self-diagnosis

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)"

and perform self-diagnosis.

4.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

F

G

H

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector.

3.

Check continuity between intake sensor harness connector

M146 terminal 2 (L/B) and front air control harness connector

M49 terminal 9 (L/B).

2 - 9 : Continuity should exist.

4.

Check continuity between intake sensor harness connector

M146 terminal 2 (L/B) and ground.

2 - Ground : Continuity should not exist.

WJIA1377E

OK or NG

OK

NG

>> 1. Replace front air control. Refer to

MTC-95, "CONTROL UNIT"

.

2. Go to self-diagnosis

MTC-45, "A/C System Self-diagnosis Function (With NAVI Only)"

and perform self-diagnosis.

>> Repair harness or connector.

I

MTC

K

L

M

Revision: October 2004

MTC-93

2005 Titan

TROUBLE DIAGNOSIS

COMPONENT INSPECTION

Intake Sensor

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

Temperature

°

C (

°

F)

15 (5)

10 (14)

5 (23)

0 (32)

5 (41)

10 (50)

15 (59)

20 (68)

25 (77)

30 (86)

35 (95)

40 (104)

45 (113)

Resistance k

209.0

160.0

123.0

95.8

74.9

58.9

46.7

37.3

30.0

24.2

19.7

16.1

13.2

If NG, replace intake sensor.

WJIA1378E

Revision: October 2004

MTC-94

2005 Titan

CONTROL UNIT

CONTROL UNIT

Removal and Installation

REMOVAL

1.

Remove the three control knobs from the front air control unit.

2.

Remove the cluster lid C. Refer to IP-10, "Removal and Installation" .

3.

Remove the four screws securing the front air control unit to the cluster lid C.

4.

Disconnect the two electrical connectors.

5.

Remove the front air control unit.

INSTALLATION

Installation is in the reverse order of removal.

PFP:27500

EJS0032V

A

B

C

D

E

LJIA0130E

F

G

H

K

L

M

I

MTC

Revision: October 2004

MTC-95

2005 Titan

INTAKE SENSOR

INTAKE SENSOR

Removal and Installation

REMOVAL

1.

Remove the instrument panel. Refer to IP-10, "Removal and Installation" .

2.

Disconnect the intake sensor electrical connector.

NOTE:

The intake sensor is located on the top of the heater and cooling unit assembly next to the A/C evaporator cover.

3.

Twist the intake sensor to remove the intake sensor from the heater and cooling unit assembly.

INSTALLATION

Installation is in the reverse order of removal.

PFP:27723

EJS0032W

WJIA1349E

Revision: October 2004

MTC-96

2005 Titan

BLOWER MOTOR

Removal and Installation

BLOWER MOTOR

Blower Motor - Heater and Cooling Unit Assembly

PFP:27226

EJS0032X

A

B

C

D

E

1.

Heater and cooling unit assembly 2.

Blower motor 3.

Variable blower control

LJIA0136E

REMOVAL

1.

Remove the glove box assembly. Refer to IP-10, "Removal and Installation" .

2.

Disconnect the blower motor electrical connector.

3.

Remove the three screws and remove the blower motor.

INSTALLATION

Installation is in the reverse order of removal.

I

MTC

F

G

H

K

L

M

Revision: October 2004

MTC-97

2005 Titan

IN-CABIN MICROFILTER

IN-CABIN MICROFILTER

Removal and Installation

FUNCTION

The air inside the passenger compartment is filtered by the in-cabin microfilters when the heater or A/C controls are set on either the recirculation or fresh mode. The two in-cabin microfilters are located in the front heater and cooling unit assembly.

PFP:27277

EJS0032Y

LJIA0012E

REPLACEMENT TIMING

Replacement of the two in-cabin microfilters is recommended on a regular interval depending on the driving conditions. Refer to MA-7, "PERIODIC MAINTENANCE" . It may also be necessary to replace the two in-cabin microfilters as part of a component replacement if the in-cabin microfilters are damaged.

REPLACEMENT PROCEDURE

1.

Remove the instrument lower cover RH.

LLIA0072E

2.

Remove the glove box assembly.

a.

Remove the two lower glove box screws.

LJIA0146E b.

Open the glove box, then remove the four upper glove box screws.

NOTE:

It is not necessary to remove the two glove box striker screws.

c.

Remove the glove box assembly from the instrument panel to access the in-cabin microfilter cover.

Revision: October 2004

MTC-98

WJIA0628E

2005 Titan

IN-CABIN MICROFILTER

3.

Remove the screw and remove the in-cabin microfilter cover.

4.

Remove the in-cabin microfilters from the front heater and cooling unit assembly housing.

5.

Insert the first new in-cabin microfilter into the front heater and cooling unit assembly housing and slide it over to the right.

Insert the second new in-cabin microfilter into the front heater and cooling unit assembly housing.

NOTE:

The in-cabin microfilters are marked with air flow arrows. The end of the microfilter with the arrow should face the rear of the vehicle. The arrows should point downward.

6.

Install the in-cabin microfilter cover.

7.

Install the glove box assembly in reverse order of removal.

Lower glove box screws

Upper glove box screws

: 3.5 N·m (0.36 kg-m, 31 in-lb)

: 3.5 N·m (0.36 kg-m, 31 in-lb)

8.

Install the instrument lower cover RH.

Revision: October 2004

MTC-99

C

LJIA0134E

D

E

A

B

LJIA0148E

F

G

H

LJIA0134E

K

L

I

MTC

M

LLIA0072E

2005 Titan

HEATER & COOLING UNIT ASSEMBLY

HEATER & COOLING UNIT ASSEMBLY

Removal and Installation

PFP:27110

EJS0032Z

1.

High-pressure A/C pipe

4.

A/C drain hose

2.

Expansion valve

5.

Heater and cooling unit assembly

3.

Low-pressure A/C pipe

WJIA0695E

REMOVAL

1.

Discharge the refrigerant from the A/C system. Refer to

MTC-112, "Discharging Refrigerant"

.

2.

Drain the coolant from the engine cooling system. Refer to MA-13, "DRAINING ENGINE COOLANT" .

3.

Remove the cowl top extension. Refer to EI-21, "Removal and Installation" .

4.

Remove the exhaust system. Refer to EX-3, "Removal and Installation" .

5.

Disconnect the heater hoses from the heater core.

6.

Disconnect the high/low pressure pipes from the expansion valve.

7.

Move the two front seats to the rearmost position on the seat track.

Revision: October 2004

MTC-100

2005 Titan

HEATER & COOLING UNIT ASSEMBLY

8.

Remove the instrument panel and console panel. Refer to IP-10, "Removal and Installation" .

9.

Remove the steering column. Refer to PS-9, "Removal and Installation" .

10. Disconnect the instrument panel wire harness at the RH and LH in-line connector brackets, and the fuse block (J/B) electrical connectors. Refer to PG-38, "Harness Layout" .

11. Disconnect the steering member from each side of the vehicle body.

12. Remove the heater and cooling unit assembly with it attached to the steering member, from the vehicle.

CAUTION:

Use care not to damage the seats and interior trim panels when removing the heater and cooling unit assembly with it attached to the steering member.

13. Remove the heater and cooling unit assembly from the steering member.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Replace the O-ring of the low-pressure pipe and high-pressure pipe with a new one, and apply compressor oil to it when installing it.

After charging the refrigerant, check for leaks.

NOTE:

Fill the engine cooling system with the specified coolant mixture. Refer to MA-11, "Fluids and Lubricants" .

Recharge the A/C system. Refer to

MTC-112, "Evacuating System and Charging Refrigerant"

.

A

B

C

D

E

F

G

H

K

L

M

I

MTC

Revision: October 2004

MTC-101

2005 Titan

HEATER CORE

HEATER CORE

Removal and Installation

Heater and Cooling Unit Assembly

PFP:27140

EJS00330

LJIA0138E

1.

Heater core cover

4.

Upper bracket

2.

Heater core pipe bracket

7.

Lower heater and cooling unit case 8.

Blower motor

3.

Heater core

5.

Upper heater and cooling unit case 6.

A/C evaporator

9.

Variable blower control

Revision: October 2004

MTC-102

2005 Titan

HEATER CORE

REMOVAL

1.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

2.

Remove the four screws and remove the upper bracket.

3.

Remove the four screws and remove the heater core cover.

4.

Remove the heater core pipe bracket.

5.

Remove the heater core.

NOTE:

If the in-cabin microfilters are contaminated from coolant leaking from the heater core, replace the in-cabin microfilters with new ones before installing the new heater core.

INSTALLATION

Installation is in the reverse order of removal.

LJIA0134E

F

G

H

I

MTC

C

D

E

A

B

K

L

M

Revision: October 2004

MTC-103

2005 Titan

DEFROSTER DOOR MOTOR

DEFROSTER DOOR MOTOR

Removal and Installation

Defroster Door Motor - Heater and Cooling Unit Assembly

PFP:27733

EJS00331

1.

Heater and cooling unit assembly

4.

Variable blower control

2.

Intake door motor

5.

Mode door motor

3.

Air mix door motor

6.

Defroster door motor

REMOVAL

1.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

2.

Remove the steering member from the heater and cooling unit assembly.

3.

Disconnect the defroster door motor electrical connector.

4.

Remove the three screws and remove the defroster door motor.

INSTALLATION

Installation is in the reverse order of removal.

WJIA0622E

Revision: October 2004

MTC-104

2005 Titan

INTAKE DOOR MOTOR

Removal and Installation

INTAKE DOOR MOTOR

Intake Door Motor - Heater and Cooling Unit Assembly

1.

Heater and cooling unit assembly

4.

Variable blower control

2.

Intake door motor

5.

Mode door motor

3.

Air mix door motor

6.

Defroster door motor

REMOVAL

1.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

2.

Remove the steering member from the heater and cooling unit assembly.

3.

Disconnect the intake door motor electrical connector.

4.

Remove the three screws and remove the intake door motor.

INSTALLATION

Installation is in the reverse order of removal.

WJIA0622E

PFP:27730

EJS00332

A

B

C

D

E

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-105

2005 Titan

MODE DOOR MOTOR

MODE DOOR MOTOR

Removal and Installation

Mode Door Motor - Heater and Cooling Unit Assembly

PFP:27731

EJS00333

1.

Heater and cooling unit assembly

4.

Variable blower control

2.

Intake door motor

5.

Mode door motor

3.

Air mix door motor

6.

Defroster door motor

REMOVAL

1.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

2.

Remove the steering member from the heater and cooling unit assembly.

3.

Disconnect the mode door motor electrical connector.

4.

Remove the two screws and remove the mode door motor.

INSTALLATION

Installation is in the reverse order of removal.

WJIA0622E

Revision: October 2004

MTC-106

2005 Titan

AIR MIX DOOR MOTOR

Removal and Installation

AIR MIX DOOR MOTOR

Air Mix Door Motor - Heater and Cooling Unit Assembly

1.

Heater and cooling unit assembly

4.

Variable blower control

2.

Intake door motor

5.

Mode door motor

3.

Air mix door motor

6.

Defroster door motor

REMOVAL

1.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

2.

Remove the steering member from the heater and cooling unit assembly.

3.

Disconnect the air mix door motor electrical connector.

4.

Remove the three screws and remove the air mix door motor.

INSTALLATION

Installation is in the reverse order of removal.

WJIA0622E

PFP:27732

EJS00334

A

B

C

D

E

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-107

2005 Titan

VARIABLE BLOWER CONTROL

VARIABLE BLOWER CONTROL

Removal and Installation

Variable Blower Control - Heater and Cooling Unit Assembly

PFP:27200

EJS00335

1.

Heater and cooling unit assembly

4.

Variable blower control

2.

Intake door motor

5.

Mode door motor

3.

Air mix door motor

6.

Defroster door motor

REMOVAL

1.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

2.

Remove the steering member from the heater and cooling unit assembly.

3.

Disconnect the blower motor resistor electrical connector.

4.

Remove the two screws and remove the blower motor resistor.

INSTALLATION

Installation is in the reverse order of removal.

WJIA0622E

Revision: October 2004

MTC-108

2005 Titan

DUCTS AND GRILLES

DUCTS AND GRILLES

Removal and Installation

Ducts - Heater and Cooling Unit Assembly

PFP:27860

EJS00336

A

B

C

D

E

F

G

H

I

MTC

K

L

M

Revision: October 2004

MTC-109

LJIA0141E

2005 Titan

1.

Defroster nozzle

4.

RH side demister duct

7.

Heater and cooling unit assembly

DUCTS AND GRILLES

2.

LH side demister duct

5.

RH ventilator duct

8.

Floor duct

Grilles

3.

LH ventilator duct

6.

Center ventilator duct

9.

Clips

1.

Instrument panel

4.

Cluster lid D ventilator LH

7.

Storage tray bottom cover (RH)

2.

Side ventilator assembly LH

5.

Cluster lid D ventilator RH

WJIA0696E

3.

Storage tray bottom cover (LH)

6.

Side ventilator assembly RH

DEFROSTER NOZZLE

Removal

1.

Remove the instrument panel trim. Refer to IP-10, "Removal and Installation" .

2.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

3.

Remove the defroster nozzle.

Installation

Installation is in the reverse order of removal.

RH AND LH SIDE DEMISTER DUCT

Removal

1.

Remove the instrument panel trim. Refer to IP-10, "Removal and Installation" .

2.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

3.

Remove the RH or LH side demister duct.

Installation

Installation is in the reverse order of removal.

RH AND LH VENTILATOR DUCT

Removal

1.

Remove the instrument panel trim. Refer to IP-10, "Removal and Installation" .

2.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

Revision: October 2004

MTC-110

2005 Titan

DUCTS AND GRILLES

3.

Remove the RH or LH ventilator duct.

Installation

Installation is in the reverse order of removal.

CENTER VENTILATOR DUCT

Removal

1.

Remove the instrument panel trim. Refer to IP-10, "Removal and Installation" .

2.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

3.

Remove the defroster nozzle.

4.

Remove the RH and LH side demister ducts.

5.

Remove the RH and LH ventilator ducts.

6.

Remove the center ventilator duct.

A

B

C

D

Installation

Installation is in the reverse order of removal.

FLOOR DUCT

Removal

1.

Remove the floor carpet. Refer to EI-41, "FLOOR TRIM" .

2.

Remove the two clips and remove the floor duct.

Installation

Installation is in the reverse order of removal.

E

F

G

GRILLES

Removal

1.

Remove the interior trim panel as necessary. Refer to EI-36, "BODY SIDE TRIM" or EI-43, "HEADLIN-

ING" .

2.

Remove the ventilator grille from the interior trim panel.

Installation

Installation is in the reverse order of removal.

H

I

MTC

K

L

M

Revision: October 2004

MTC-111

2005 Titan

REFRIGERANT LINES

REFRIGERANT LINES

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

SETTING OF SERVICE TOOLS AND EQUIPMENT

Discharging Refrigerant

PFP:92600

EJS00337

1.

Shut-off valve 2.

A/C service valve

WJIA0579E

3.

Recovery/Recycling equipment ACR 2000

(J-43600) with refrigerant identifier

WARNING:

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

(R-134a) recovery equipment. If an accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Evacuating System and Charging Refrigerant

1.

Shut-off valve

Revision: October 2004

2.

A/C service valve

MTC-112

WJIA0580E

3.

Recovery/Recycling equipment ACR

2000 (J-43600) with refrigerant identifier

2005 Titan

REFRIGERANT LINES

4.

Refrigerant container (HFC-134a) 5.

Weight scale (J-39650)

7.

Manifold gauge set (J-39183)

6.

Evacuating vacuum pump (J-39699)

F

G

H

I

MTC

K

L

M

C

D

E

A

B

*1

MTC-20, "CHECKING AND

ADJUSTING"

*2

MTC-123, "Checking for Refrigerant

Leaks"

*3

MTC-123, "Checking for Refrigerant

Leaks"

*4

MTC-81, "PERFORMANCE TEST

DIAGNOSES"

WJIA0530E

*5

MTC-4, "Contaminated Refrigerant"

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Components

REFRIGERANT LINES

A/C Compressor and Condenser

EJS00338

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2005 Titan

REFRIGERANT LINES

1.

High-pressure service valve

4.

Refrigerant pressure sensor

7.

High-pressure flexible hose

10. Low-pressure pipe

2.

Grommet

5.

Condenser

8.

Low-pressure flexible hose

11.

Expansion valve

NOTE:

Refer to

MTC-6, "Precautions for Refrigerant Connection"

.

Removal and Installation for Compressor

A/C Compressor Mounting

3.

High-pressure pipe

6.

Compressor shaft seal

9.

Low-pressure service valve

12. Drain hose

A

B

EJS00339

C

D

E

F

G

H

I

MTC

K

L

M

WJIA0698E

REMOVAL

1.

Discharge the refrigerant. Refer to

MTC-112, "HFC-134a (R-134a) Service Procedure"

.

2.

Remove the front right wheel and tire assembly. Refer to WT-6, "Rotation" .

3.

Remove the engine under cover and the splash shield using power tool.

4.

Remove the engine air cleaner and air ducts. Refer to EM-14, "AIR CLEANER AND AIR DUCT" .

5.

Remove the drive belt. Refer to EM-12, "DRIVE BELTS" .

6.

Disconnect the compressor electrical connector.

7.

Disconnect the high-pressure flexible hose and low-pressure flexible hose from the compressor.

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REFRIGERANT LINES

CAUTION:

Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.

8.

Remove the compressor bolts and nut using power tools.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Replace the O-ring of the low-pressure flexible hose and high-pressure flexible hose with a new one, apply compressor oil to the O-rings before installation.

After recharging the A/C system with refrigerant, check for leaks.

Removal and Installation for Compressor Clutch

Magnet Clutch Assembly

EJS0033A

1.

Magnet clutch assembly

4.

Clutch disc

7.

Compressor

2.

Magnet coil

5.

Snap ring

3.

Pulley

6.

Thermal protector (built in)

REMOVAL

1.

Remove the compressor. Refer to

MTC-115, "Removal and Installation for Compressor"

.

2.

Remove the center bolt while holding the clutch disc stationary using Tool as shown.

Tool number : J-44614

3.

Remove the clutch disc.

WJIA0372E

WHA228

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REFRIGERANT LINES

4.

Remove the snap ring using external snap ring pliers or suitable tool.

5.

Remove the pulley using Tool with a small adapter. Position the small adapter on the end of the drive shaft and the center of the puller on the small adapter.

Tool number : KV99233130 (J-29884)

CAUTION:

To prevent deformation of the pulley groove, the puller claws should be hooked under the pulley groove and not into the pulley groove.

6.

Remove the magnet coil harness clip using a screwdriver, remove the three magnet coil fixing screws and remove the magnet coil.

INSPECTION

Clutch Disc

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

WHA183

Pulley

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

Coil

Check magnet coil for loose connections or any cracked insulation.

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C

RHA072C

D

E

A

B

F

WJIA1017E

G

H

WHA212

K

L

I

MTC

M

REFRIGERANT LINES

INSTALLATION

1.

Install the magnet coil.

CAUTION:

Be sure to align the magnet coil pin with the hole in the compressor front head.

2.

Install the magnet coil harness clip using a screwdriver.

3.

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

Tool number : — (J-38873-A)

4.

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

5.

Install the clutch pulley bolt using Tool, to prevent the clutch disc from turning and tighten the bolt to specification.

Tool number : J-44614

CAUTION:

After tightening the clutch pulley bolt, check that the clutch pulley rotates smoothly.

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WHA213

WHA229

2005 Titan

WJIA1016E

WHA184

REFRIGERANT LINES

6.

Check the pulley clearance all the way around the clutch disc as shown.

Clutch disc-to-pulley clearance : 0.3 - 0.6 mm

(0.012 - 0.024 in)

7.

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

8.

Connect the compressor electrical connector.

9.

Install the drive belt. Refer to EM-12, "DRIVE BELTS" .

10. Install the engine under cover and the splash shield.

F

G

WHA194

BREAK-IN OPERATION

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

Removal and Installation for Low-pressure Flexible Hose

REMOVAL

1.

Remove the engine room cover using power tool.

EJS0033B

2.

Remove the engine air cleaner and air ducts. Refer to EM-14, "AIR CLEANER AND AIR DUCT"

3.

Discharge the refrigerant. Refer to

MTC-112, "HFC-134a (R-134a) Service Procedure"

.

CAUTION:

Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.

4.

Remove the low-pressure flexible hose.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Replace the O-ring of the low-pressure flexible hose with a new one, then apply compressor oil to it when installing it.

After charging refrigerant, check for leaks.

Removal and Installation for High-pressure Flexible Hose

REMOVAL

1.

Remove the engine under cover using power tool.

EJS0033C

2.

Remove the engine air cleaner and air ducts. Refer to EM-14, "AIR CLEANER AND AIR DUCT"

3.

Discharge the refrigerant. Refer to

MTC-112, "HFC-134a (R-134a) Service Procedure"

.

4.

Remove the high-pressure flexible hose.

CAUTION:

Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Replace the O-ring of the high-pressure flexible hose with a new one, then apply compressor oil to it when installing it.

H

I

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K

L

M

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C

D

E

A

B

REFRIGERANT LINES

After charging refrigerant, check for leaks.

Removal and Installation for High-pressure Pipe

REMOVAL

1.

Disconnect the battery negative terminal.

EJS0033D

2.

Reposition the IPDM E/R aside.

3.

Remove the front right wheel and tire assembly. Refer to WT-6, "Rotation" .

4.

Position aside the front floor insulator.

5.

Discharge the refrigerant. Refer to

MTC-112, "HFC-134a (R-134a) Service Procedure"

.

6.

Remove the high-pressure pipe.

CAUTION:

Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Replace the O-ring of the high-pressure pipe with a new one, then apply compressor oil to it when installing it.

After charging refrigerant, check for leaks.

Removal and Installation for Low-pressure Pipe

REMOVAL

1.

Discharge the refrigerant. Refer to

MTC-112, "HFC-134a (R-134a) Service Procedure"

.

EJS0033E

2.

Remove the low-pressure pipe.

CAUTION:

Cap or wrap the joint of the pipes with suitable material such as vinyl tape to avoid the entry of air.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Replace the O-ring of the high/low-pressure pipe with a new one, then apply compressor oil to it when installing it.

After charging refrigerant, check for leaks.

Removal and Installation for Refrigerant Pressure Sensor

REMOVAL

1.

Disconnect the refrigerant pressure sensor electrical connector.

2.

Remove the refrigerant pressure sensor from the condenser.

CAUTION:

Be careful not to damage the condenser fins.

EJS0033F

LJIA0145E

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Be careful not to damage the condenser fins.

Apply compressor oil to the O-ring of the refrigerant pressure sensor when installing it.

Removal and Installation for Condenser

REMOVAL

1.

Discharge the refrigerant. Refer to

MTC-112, "HFC-134a (R-134a) Service Procedure"

.

2.

Remove the radiator. Refer to CO-12, "Removal and Installation" .

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REFRIGERANT LINES

CAUTION:

Be careful not to damage the core surface of the condenser and the radiator.

3.

Disconnect the high-pressure flexible hose and the high-pressure pipe from the condenser.

CAUTION:

Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.

4.

Disconnect the refrigerant pressure sensor connector.

Remove the refrigerant pressure sensor from the condenser as necessary.

5.

Lift the condenser out of the mounting grommets to remove the condenser.

A

B

C

D

E

LJIA0145E

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Replace the O-rings of the high-pressure pipe and the high-pressure flexible hose with new ones, then apply compressor oil to them after installing them.

After charging refrigerant, check for leaks.

Replace the grommets as necessary.

F

G

H

K

L

M

I

MTC

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REFRIGERANT LINES

Removal and Installation for Evaporator

Heater and Cooling Unit Assembly

EJS0033H

LJIA0138E

1.

Heater core cover

4.

Upper bracket

2.

Heater core pipe bracket

7.

Lower heater and cooling unit case 8.

Blower motor

3.

Heater core

5.

Upper heater and cooling unit case 6.

A/C evaporator

9.

Variable blower control

REMOVAL

1.

Remove the heater core. Refer to

MTC-102, "Removal and Installation"

.

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REFRIGERANT LINES

2.

Remove the defroster mode door arm.

3.

Separate the heater core and cooling unit case.

4.

Remove the evaporator.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Replace the O-rings on the low-pressure flexible hose and the high-pressure pipe with new ones.

Apply compressor oil to the O-rings before installing them.

Removal and Installation for Expansion Valve

REMOVAL

1.

Discharge the refrigerant. Refer to

MTC-112, "HFC-134a (R-134a) Service Procedure"

.

2.

Remove the heater and cooling unit assembly. Refer to

MTC-100, "Removal and Installation"

.

3.

Remove the cooler grommet.

4.

Remove the expansion valve.

EJS0033I

A

B

C

D

E

F

G

WJIA0582E

INSTALLATION

Installation is in the reverse order of removal.

Expansion valve bolts : 4 N·m (0.41 kg-m, 35 in-lb)

A/C refrigerant pipe to expansion valve bolt : Refer to

MTC-114, "Components"

.

CAUTION:

Replace the O-rings on the A/C refrigerant pipes with new ones, then apply compressor oil to them when installing them.

After charging refrigerant, check for leaks.

Checking for Refrigerant Leaks

EJS0033J

Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C lubricant leakage, damage, and corrosion. Any A/C lubricant leakage may indicate an area of refrigerant leakage. Allow extra inspection time in these areas when using either an electronic refrigerant leak detector (J-41995) or fluorescent dye leak detector (J-42220).

If any dye is observed using a fluorescent dye leak detector (J-42220), confirm the leak using a electronic refrigerant leak detector (J-41995). It is possible that the dye is from a prior leak that was repaired and not properly cleaned.

When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all system components and connections.

When searching for refrigerant leaks using an electronic refrigerant leak detector (J-41995), move the probe along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the component.

CAUTION:

Moving the electronic refrigerant leak detector probe slower and closer to the suspected leak area will improve the chances of finding a leak.

Checking System for Leaks Using the Fluorescent Dye Leak Detector

EJS0033K

1.

Check the A/C system for leaks using the fluorescent dye leak detector and safety goggles (J-42220) in a low sunlight area (area without windows preferable). Illuminate all components, fittings and lines. The dye will appear as a bright green/yellow area at the point of leakage. Fluorescent dye observed at the evaporator drain opening indicates an evaporator core assembly leak (tubes, core or expansion valve).

H

I

MTC

K

L

M

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REFRIGERANT LINES

2.

If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or cloth, then inspect the shop rag or cloth with the fluorescent dye leak detector (J-42220) for dye residue.

3.

After the leak is repaired, remove any residual dye using refrigerant dye cleaner (J-43872) to prevent future misdiagnosis.

4.

Perform a system performance check and then verify the leak repair using a electronic refrigerant leak detector (J-41995).

NOTE:

Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield washer fluid, solvents and lubricants, may falsely trigger the leak detector. Make sure the surfaces to be checked are clean.

Clean with a dry cloth or blow off with shop air.

Do not allow the sensor tip of the electronic refrigerant leak detector (J-41995) to contact with any substance. This can also cause false readings and may damage the detector.

Dye Injection

EJS0033L

NOTE:

This procedure is only necessary when recharging the system or when the compressor has seized and must be replaced.

1.

Check the A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg-cm

2

, 50 psi).

2.

Pour one bottle 7.4 cc (1/4 ounce) of the HFC-134a (R-134a) fluorescent leak detection dye (J-41447) into the HFC-134a (R-134a) dye injector (J-41459).

CAUTION:

If repairing the A/C system or replacing a component, pour the HFC-134a (R-134a) fluorescent leak detection dye (J-41447) directly into the open system connection and proceed with the service procedures.

3.

Connect the refrigerant dye injector (J-41459) to the low-pressure service valve.

4.

Start the engine and switch the A/C system ON.

5.

When the A/C system is operating (compressor running), inject one bottle 7.4 cc (1/4 ounce) of HFC-134a

(R-134a) fluorescent leak detection dye (J-41447) through the low-pressure service valve using HFC-

134a (R-134a) dye injector (J-41459). Refer to the manufacturer's operating instructions.

6.

With the engine still running, disconnect the HFC-134a (R-134a) dye injector (J-41459) from the low-pressure service valve.

7.

Operate the A/C system for a minimum of 20 minutes to mix the HFC-134a (R-134a) fluorescent leak detection dye (J-41447) with the A/C system oil. Depending on the leak size, operating conditions and location of the leak, it may take from minutes to days for the HFC-134a (R-134a) fluorescent leak detection dye to penetrate an A/C system leak and become visible.

Electronic Refrigerant Leak Detector

PRECAUTIONS FOR HANDLING LEAK DETECTOR

EJS0033M

NOTE:

When performing a refrigerant leak check, use a electronic refrigerant leak detector (J-41995) or equivalent.

Ensure that the electronic refrigerant leak detector (J-41995) is calibrated and set properly according to the manufacturer's operating instructions.

The electronic refrigerant leak detector (J-41995) is a delicate device. To use the leak detector properly, read the manufacturer's operating instructions and perform any specified maintenance.

Revision: October 2004

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REFRIGERANT LINES

1.

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

2.

When checking for leaks, circle each fitting completely with the probe as shown.

C

SHA707EA

D

E

A

B

3.

Move the probe along each component at a speed of approximately 25 - 50 mm (1 - 2 in)/second as shown.

SHA706E

F

G

H

I

MTC

SHA708EA

CHECKING PROCEDURE

NOTE:

To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette smoke in the vicinity of the vehicle. Perform the leak test in a calm area (low air/wind movement) so that the leaking refrigerant is not dispersed.

1.

Turn the engine OFF.

2.

Connect the manifold gauge set (J-39183-C) to the A/C service ports. Refer to

MTC-112, "SETTING OF

SERVICE TOOLS AND EQUIPMENT"

.

3.

Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm

2

, 50 psi) above a temperature of

16

°

C (61

°

F). If less than specification, recover/evacuate and recharge the system with the specified amount of refrigerant. Refer to

MTC-112, "HFC-134a (R-134a) Service Procedure"

.

NOTE:

At temperatures below 16

°

C (61

°

F), leaks may not be detected since the system may not reach 345 kPa

(3.52 kg/cm

2

, 50 psi) pressure.

4.

Perform the leak test from the high-pressure side (A/C compressor discharge “a” to evaporator inlet “f”) to the low-pressure side (evaporator drain hose “g” to compressor shaft seal “k”). Refer to

MTC-114, "Components"

. Clean the component to be checked and carefully move the electronic refrigerant leak detector probe completely around the following connections and components.

Check the compressor shaft seal

Check the high and low-pressure pipe and hose fittings, and relief valve

Check the liquid tank

Revision: October 2004

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K

L

M

REFRIGERANT LINES

Check the refrigerant pressure sensor

Check all around the service valves. Ensure service valve caps are secured on the service valves (to prevent leaks).

NOTE:

After removing manifold gauge set (J-39183-C) from the service valves, wipe any residue from the service valves to prevent any false readings by the electronic refrigerant leak detector (J-41995).

Evaporator

With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in the heater and cooling unit assembly. Wait a minimum of 10 minutes accumulation time (refer to the manufacturer's recommended procedure for actual wait time) before inserting the electronic refrigerant leak detector probe into the heater and cooling unit assembly drain hose.

NOTE:

Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water or dirt that may be in the drain hose.

5.

If a leak is detected, verify at least once by blowing compressed air into the area of the suspected leak, then repeat the leak check.

6.

Do not stop when one leak is found. Continue to check for additional leaks at all system components and connections.

7.

If no leaks are found, perform steps 8 - 11.

8.

Start the engine.

9.

Set the heater A/C controls as follows:

NOTE:

For the automatic system, turn OFF the automatic controls and set the heater A/C controls manually.

a.

A/C switch to ON b.

Air flow to VENT mode c.

Intake position to RECIRCULATION mode d.

Temperature to MAX cold e.

Blower speed to HIGH

10. Run the engine at 1,500 rpm for at least 2 minutes.

11. Turn the engine OFF and perform the leak check again following steps 4 through 6 above.

Refrigerant leaks should be checked immediately after turning the engine OFF. Begin with the leak detector at the compressor.

The pressure on the high pressure side will gradually drop after the refrigerant circulation stops and pressure on the low pressure side will gradually rise, as shown in the graph. Some leaks are more easily detected when the pressure is high.

SHA839E

12. Before connecting the recovery/recycling recharging equipment to the vehicle, check the recovery/recycling recharging equipment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover the refrigerant from the equipment lines and then check the refrigerant purity.

13. Confirm refrigerant purity in supply tank using recovery/recycling recharging equipment and refrigerant identifier equipment (J-41810-NI).

14. Confirm the refrigerant purity in the vehicle's A/C system using recovery/recycling recharging equipment and refrigerant identifier equipment (J-41810-NI).

15. Discharge the A/C system using recovery/recycling recharging equipment. Repair the leaking fitting or component as necessary.

16. Evacuate and recharge the A/C system and perform the leak test to confirm that there are no refrigerant leaks.

17. Conduct the Operational Check to ensure system works properly. Refer to

MTC-47, "Operational Check"

.

Revision: October 2004

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SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS)

Service Data and Specifications (SDS)

COMPRESSOR

Make

Model

Type

Displacement

Cylinder bore

× stroke

Direction of rotation

Drive belt

LUBRICANT

Make

Model

Name

Part number

Capacity

REFRIGERANT

Type

Capacity

ENGINE IDLING SPEED

Refer to EC-76, "Idle Speed and Ignition Timing Check" .

BELT TENSION

Refer to EM-12, "Tension Adjustment" .

ZEXEL VALEO CLIMATE CONTROL

DKS-17D

Swash plate

175.5 cm

3

(10.7 in

3

) / revolution

30.5 mm (1.20 in) x 24.0 mm (0.94 in)

Clockwise (viewed from drive end)

Poly V

PFP:00030

EJS0033N

A

ZEXEL VALEO CLIMATE CONTROL

DKS-17D

NISSAN A/C System Lubricant Type S (DH-PS)

KLH00-PAGS0

200 m (6.8 US fl oz, 7.0 lmp fl oz)

HFC-134a (R-134a)

0.70

±

0.05 kg (1.54

±

0.11 lb)

B

C

D

E

F

G

H

I

MTC

K

L

M

Revision: October 2004

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SERVICE DATA AND SPECIFICATIONS (SDS)

Revision: October 2004

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2005 Titan

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