2003 NISSAN TEANA sensor

ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
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AUTOMATIC AIR CONDITIONER
PRECAUTIONS .......................................................... 5
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 5
Precautions Necessary for Steering Wheel Rotation
After Battery Disconnect .......................................... 5
OPERATION PROCEDURE ................................. 5
Precautions for Working with HFC-134a (R-134a) ..... 5
General Refrigerant Precautions .............................. 6
Precautions for Refrigerant Connection ................... 6
ABOUT ONE-TOUCH JOINT ................................ 6
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ...................................................... 8
O-RING AND REFRIGERANT CONNECTION ..... 9
Precautions for Servicing Compressor .................... 11
Precautions for Service Equipment ........................ 12
RECOVERY/RECYCLING EQUIPMENT ............ 12
ELECTRICAL LEAK DETECTOR ....................... 12
VACUUM PUMP ................................................. 12
MANIFOLD GAUGE SET .................................... 12
SERVICE HOSES ............................................... 13
SERVICE COUPLERS ........................................ 13
REFRIGERANT WEIGHT SCALE ...................... 13
CALIBRATING ACR4 WEIGHT SCALE .............. 13
CHARGING CYLINDER ...................................... 14
Precautions for Leak Detection Dye ....................... 14
IDENTIFICATION ................................................ 14
IDENTIFICATION LABEL FOR VEHICLE ........... 14
PREPARATION ......................................................... 15
Special Service Tools ............................................. 15
HFC-134a (R-134a) Service Tools and Equipment ... 16
Commercial Service Tools ...................................... 18
REFRIGERATION SYSTEM ..................................... 19
Refrigerant Cycle ................................................... 19
REFRIGERANT FLOW ....................................... 19
FREEZE PROTECTION ..................................... 19
Refrigerant System Protection ............................... 19
REFRIGERANT PRESSURE SENSOR ............. 19
PRESSURE RELIEF VALVE ............................... 19
Component Layout ................................................. 20LUBRICANT .............................................................. 21
Maintenance of Lubricant Quantity in Compressor ... 21
LUBRICANT ........................................................ 21
LUBRICANT RETURN OPERATION .................. 21
LUBRICANT ADJUSTING PROCEDURE FOR
COMPONENTS REPLACEMENT EXCEPT
COMPRESSOR .................................................. 22
LUBRICANT ADJUSTING PROCEDURE FOR
COMPRESSOR REPLACEMENT ....................... 22
AIR CONDITIONER CONTROL ............................... 24
Description of Air Conditioner LAN Control System ... 24
System Construction .............................................. 24
OPERATION ........................................................ 24
TRANSMISSION DATA AND TRANSMISSION
ORDER ............................................................... 25
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL) ..................................... 26
FAN SPEED CONTROL ...................................... 26
INTAKE DOOR CONTROL ................................. 26
MODE DOOR CONTROL ................................... 26
MAGNET CLUTCH CONTROL ........................... 27
SELF-DIAGNOSIS SYSTEM .............................. 27
Description of Control System ................................ 28
Control Operation ................................................... 29
DISPLAY SCREEN .............................................. 29
TEMPERATURE CONTROL SWITCH (POTEN-
TIO TEMPERATURE CONTROL) (DRIVER
SIDE) ................................................................... 29
TEMPERATURE CONTROL SWITCH (POTEN-
TIO TEMPERATURE CONTROL) (PASSEN-
GER SIDE) .......................................................... 29
AUTO SWITCH ................................................... 29
A/C SWITCH ....................................................... 29
FAN SWITCH ...................................................... 29
INTAKE SWITCH ................................................. 30
MODE SWITCH .................................................. 30
DEFROSTER (DEF) SWITCH ............................. 30
REAR WINDOW DEFOGGER SWITCH ............. 30
DUAL SWITCH .................................................... 30
Fail-safe Function ................................................... 30

ATC-2 Discharge Air Flow ................................................. 31
System Description ................................................. 32
SWITCHES AND THEIR CONTROL FUNCTION ... 32
CAN Communication System Description .............. 33
TROUBLE DIAGNOSIS ............................................ 34
CONSULT-II Function (BCM) .................................. 34
CONSULT-II BASIC OPERATION ....................... 34
DATA MONITOR .................................................. 34
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 35
WORK FLOW ...................................................... 35
SYMPTOM TABLE .............................................. 35
Component Parts and Harness Connector Location ... 36
ENGINE COMPARTMENT .................................. 36
PASSENGER COMPARTMENT .......................... 37
Schematic ............................................................... 38
Wiring Diagram — A/C — ....................................... 39
Auto Amp. Terminals and Reference Value ............ 44
PIN CONNECTOR TERMINAL LAYOUT ............ 44
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ........................ 44
Self-diagnosis Function .......................................... 46
DESCRIPTION .................................................... 46
FUNCTION CONFIRMATION PROCEDURE ...... 47
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................... 52
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................... 53
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION ................................................. 53
Operational Check .................................................. 54
CHECKING MEMORY FUNCTION ..................... 54
CHECKING BLOWER ......................................... 54
CHECKING DISCHARGE AIR ............................ 54
CHECKING INTAKE AIR ..................................... 54
CHECKING TEMPERATURE DECREASE ......... 54
CHECKING TEMPERATURE INCREASE .......... 55
CHECKING A/C SWITCH ................................... 55
CHECKING AUTO MODE ................................... 55
Power Supply and Ground Circuit for Auto Amp. ... 56
INSPECTION FLOW ........................................... 56
COMPONENT DESCRIPTION ............................ 57
DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 57
LAN System Circuit ................................................ 59
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 59
Mode Door Motor Circuit ........................................ 63
INSPECTION FLOW ........................................... 63
SYSTEM DESCRIPTION .................................... 64
COMPONENT DESCRIPTION ............................ 65
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR ............................................................... 65
Air Mix Door Motor Circuit ...................................... 66
INSPECTION FLOW ........................................... 66
SYSTEM DESCRIPTION .................................... 67
COMPONENT DESCRIPTION ............................ 68
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR ............................................................... 68
Air Mix Door Motor PBR Circuit .............................. 68DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR PBR ....................................................... 68
Intake Door Motor Circuit ........................................ 69
INSPECTION FLOW ............................................ 69
SYSTEM DESCRIPTION ..................................... 70
COMPONENT DESCRIPTION ............................ 71
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR ................................................................ 71
Blower Motor Circuit ................................................ 72
INSPECTION FLOW ............................................ 72
SYSTEM DESCRIPTION ..................................... 73
COMPONENT DESCRIPTION ............................ 74
DIAGNOSIS PROCEDURE FOR BLOWER
MOTOR ................................................................ 74
COMPONENT INSPECTION ............................... 77
Magnet Clutch Circuit .............................................. 78
INSPECTION FLOW ............................................ 78
SYSTEM DESCRIPTION ..................................... 79
DIAGNOSIS PROCEDURE FOR MAGNET
CLUTCH .............................................................. 79
COMPONENT INSPECTION ............................... 83
Insufficient Cooling .................................................. 84
INSPECTION FLOW ............................................ 84
PERFORMANCE TEST DIAGNOSIS .................. 85
PERFORMANCE CHART .................................... 87
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE ................................................................... 88
Insufficient Heating ................................................. 91
INSPECTION FLOW ............................................ 91
Noise ....................................................................... 92
INSPECTION FLOW ............................................ 92
Self-diagnosis ......................................................... 94
INSPECTION FLOW ............................................ 94
Memory Function .................................................... 95
INSPECTION FLOW ............................................ 95
Ambient Sensor Circuit ........................................... 96
COMPONENT DESCRIPTION ............................ 96
AMBIENT TEMPERATURE INPUT PROCESS ... 96
DIAGNOSIS PROCEDURE FOR AMBIENT
SENSOR .............................................................. 96
COMPONENT INSPECTION ............................... 98
In-vehicle Sensor Circuit ......................................... 99
COMPONENT DESCRIPTION ............................ 99
DIAGNOSIS PROCEDURE FOR IN-VEHICLE
SENSOR ............................................................100
COMPONENT INSPECTION .............................101
Sunload Sensor Circuit .........................................102
COMPONENT DESCRIPTION ..........................102
SUNLOAD INPUT PROCESS ...........................102
DIAGNOSIS PROCEDURE FOR SUNLOAD
SENSOR ............................................................102
COMPONENT INSPECTION .............................104
Intake Sensor Circuit .............................................105
COMPONENT DESCRIPTION ..........................105
DIAGNOSIS PROCEDURE FOR INTAKE SEN-
SOR ...................................................................105
COMPONENT INSPECTION .............................106

ATC-3
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A/C CONTROLLER ................................................ 107
Removal and Installation of A/C and AV Switch ... 107
REMOVAL ......................................................... 107
INSTALLATION ................................................. 107
AUTO AMP ............................................................. 108
Removal and Installation of Unified Meter and A/C
Amp. ..................................................................... 108
REMOVAL ......................................................... 108
INSTALLATION ................................................. 108
AMBIENT SENSOR ................................................ 109
Removal and Installation ...................................... 109
REMOVAL ......................................................... 109
INSTALLATION ................................................. 109
IN-VEHICLE SENSOR .............................................110
Removal and Installation ....................................... 110
REMOVAL .......................................................... 110
INSTALLATION .................................................. 110
SUNLOAD SENSOR ............................................... 111
Removal and Installation ...................................... . 111
REMOVAL ......................................................... . 111
INSTALLATION ................................................. . 111
INTAKE SENSOR ....................................................112
Removal and Installation ....................................... 112
REMOVAL .......................................................... 112
INSTALLATION .................................................. 112
BLOWER UNIT ........................................................113
Removal and Installation ....................................... 113
REMOVAL .......................................................... 113
INSTALLATION .................................................. 113
Disassembly and Assembly .................................. 114
BLOWER MOTOR ...................................................115
Removal and Installation ....................................... 115
REMOVAL .......................................................... 115
INSTALLATION .................................................. 115
FAN CONTROL AMPLIFIER ...................................116
Removal and Installation ....................................... 116
REMOVAL .......................................................... 116
INSTALLATION .................................................. 116
INTAKE DOOR MOTOR ..........................................117
Removal and Installation ....................................... 117
REMOVAL .......................................................... 117
INSTALLATION .................................................. 117
AIR CONDITIONER FILTER ....................................118
Removal and Installation ....................................... 118
FUNCTION ......................................................... 118
REPLACEMENT TIMING ................................... 118
REPLACEMENT PROCEDURES ...................... 118
HEATER & COOLING UNIT ASSEMBLY ...............119
Removal and Installation ....................................... 119
REMOVAL .......................................................... 119
INSTALLATION ................................................. 120
Disassembly and Assembly ................................. 121
MODE DOOR MOTOR ........................................... 123
Removal and Installation ...................................... 123
REMOVAL ......................................................... 123
INSTALLATION ................................................. 123AIR MIX DOOR MOTOR .........................................124
Removal and Installation ......................................124
REMOVAL .........................................................124
INSTALLATION .................................................124
HEATER CORE .......................................................125
Removal and Installation ......................................125
REMOVAL .........................................................125
INSTALLATION .................................................125
DUCTS AND GRILLES ...........................................126
Removal and Installation ......................................126
REMOVAL .........................................................126
INSTALLATION .................................................130
REFRIGERANT LINES ...........................................131
HFC-134a (R-134a) Service Procedure ...............131
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................131
Components .........................................................133
QR ENGINE ......................................................133
VQ ENGINE ......................................................134
Removal and Installation of Compressor ..............134
REMOVAL .........................................................134
INSTALLATION .................................................136
Check Disc to Pulley Clearance ...........................136
Removal and Installation of Low-pressure Flexible
Hose and Low-pressure Pipe 1 ............................137
REMOVAL .........................................................137
INSTALLATION .................................................137
Removal and Installation of High-pressure Flexible
Hose .....................................................................138
REMOVAL .........................................................138
INSTALLATION .................................................138
Removal and Installation of High-pressure Pipe 1
(Engine Compartment) .........................................139
REMOVAL .........................................................139
INSTALLATION .................................................139
Removal and Installation of Low-pressure Pipe 2
and High-pressure Pipe 2 .....................................140
REMOVAL .........................................................140
INSTALLATION .................................................141
Removal and Installation of Condenser ................142
REMOVAL .........................................................142
INSTALLATION .................................................143
Removal and Installation of Liquid Tank ...............143
REMOVAL .........................................................143
INSTALLATION .................................................144
Removal and Installation of Refrigerant Pressure
Sensor ..................................................................144
REMOVAL .........................................................144
INSTALLATION .................................................144
Removal and Installation of Evaporator ................144
REMOVAL .........................................................144
INSTALLATION .................................................145
Removal and Installation of Expansion Valve .......145
REMOVAL .........................................................145
INSTALLATION .................................................145
Checking for Refrigerant Leaks ............................146
Checking System for Leaks Using the Fluorescent
Leak Detector .......................................................146

ATC-6
PRECAUTIONS

–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, never remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possi-
ble to minimize the entry of moisture into system.
–Only use the specified lubricant from a sealed container. Immediately reseal containers of lubri-
cant. Without proper sealing, lubricant will become moisture saturated and should not be used.
–Never allow lubricant (Nissan A/C System Oil Type S) to come in contact with styrene foam parts.
Damage may result.
General Refrigerant PrecautionsBJS000F5
WARNING:

Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Use only approved recovery/recycling equipment to discharge HFC-134a (R-134a) refriger-
ant. If accidental system discharge occurs, ventilate work area before resuming service. Addi-
tional health and safety information may be obtained from refrigerant and lubricant
manufacturers.

Never 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.

Never store or heat refrigerant containers above 52°C (126°F).

Never 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.

Never 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.

Never pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air condition-
ing 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 Refrigerant ConnectionBJS000F7
A new type refrigerant connection has been introduced to all refrigerant lines except the following location.

Expansion valve to evaporator

Refrigerant pressure sensor to condenser
ABOUT ONE-TOUCH JOINT
Description

One-touch joints are pipe joints which do not require tools during piping connection.

Unlike conventional connection methods using union nuts and flanges, controlling tightening torque at
connection point is not necessary.

When removing a pipe joint, use a disconnector.

ATC-10
PRECAUTIONS

VQ Engine
CAUTION:
The new and former refrigerant connections use different O-ring configurations. Never confuse O-
rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant may leak at the con-
nection.
O-Ring Part Numbers and Specifications
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.
SJIA1646E
Connection type Piping connection point Part number QTY O-ring size
NewLow-pressure pipe 1 to low-pressure pipe 2 (One-touch joint) 92473 N8221 2 16
Low-pressure pipe 2 to expansion valve 92473 N8210 1 16
High-pressure pipe 1 to high-pressure pipe 2 (One-touch joint) 92471 N8221 2 8
High-pressure pipe 2 to expansion valve 92471 N8210 1 8
Condenser to high-pressure flexible hose 92472 N8210 1 12
Condenser to high-pressure pipe 1 92471 N8210 1 8
Low-pressure flexible hose to low-pressure pipe 1 (VQ engine) 92473 N8210 1 16
Compressor to low-pressure flexible hose 92474 N8210 1 19
Compressor to high-pressure flexible hose 92472 N8210 1 12
Liquid tank to condenser pipeInlet
92471 N82101
8
Outlet 1
FormerRefrigerant pressure sensor to condenser J2476 89956 1 10
Expansion valve to evaporatorInlet 92475 71L00 1 12
Outlet 92475 72L00 1 16

REFRIGERATION SYSTEM
ATC-19
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REFRIGERATION SYSTEMPFP:KA990
Refrigerant CycleBJS000FF
REFRIGERANT FLOW
The refrigerant flows form the compressor through the condenser with liquid tank, through the evaporator, and
back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally equalized
expansion valve, located inside the evaporator case.
FREEZE PROTECTION
To prevent evaporator frozen up, the evaporator air temperature is monitored, and the voltage signal to the
unified meter and A/C amp. will make the A/C relay go OFF and stop the compressor.
Refrigerant System ProtectionBJS000FG
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high- or low-pressure by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above, or falls below the specifications, the refrig-
erant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by refrigerant pressure sensor is over about 2,746 kPa (27.46 bar, 28 kg/cm
2 , 398 psi), or below
about 134 kPa (1.34 bar, 1.4 kg/cm
2 , 20 psi).
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an unusual level [more than 3,727 kPa (37.27 bar,
38 kg/cm
2 , 540 psi)], the release port on the pressure relief valve automatically opens and releases refriger-
ant into the atmosphere.
RJIA1745E

ATC-24
AIR CONDITIONER CONTROL

AIR CONDITIONER CONTROLPFP:27500
Description of Air Conditioner LAN Control SystemBJS000FJ
The LAN (Local Area Network) system consists of unified meter and A/C amp., mode door motor, air mix door
motors and intake door motor.
A configuration of these components is shown in the figure below.
System ConstructionBJS000FK
A small network is constructed between the unified meter and A/C amp., air mix door motors, mode door
motor and intake door motor. The unified meter and A/C amp. and motors are connected by data transmission
lines and motor power supply lines. The LAN network is built through the ground circuits of each door motor.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the unified meter and A/C amp. and each door motor.
The following functions are contained in LCUs built into the air mix door motors, the mode door motor and the
intake door motor.

Address

Motor opening angle signals

Data transmission

Motor stop and drive decision

Opening angle sensor (PBR function)

Comparison

Decision (Unified meter and A/C amp. indicated value and motor opening angle comparison)
OPERATION
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door
motor LCU and intake door motor LCU.
The mode door motor, air mix door motors and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors is compared by the LCUs in each door motor with the existing decision and open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection
data is returned to the unified meter and A/C amp.
SJIA1609E
RJIA1747E

AIR CONDITIONER CONTROL
ATC-27
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MAGNET CLUTCH CONTROL
When A/C switch is pressed (with FAN ON), press DEF switch, unified meter and A/C amp. transmits com-
pressor ON signal to BCM.
BCM sends compressor ON signal to ECM, via CAN communication.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sen-
sor signal, throttle angle, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to
IPDM E/R, via CAN communication.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
SELF-DIAGNOSIS SYSTEM
The self-diagnosis system is built into the unified meter and A/C amp. to quickly locate the cause of malfunc-
tions.
SJIA1648E