2003 NISSAN TEANA heating

AT-8
PRECAUTIONS

Service Notice or PrecautionsBCS000ZH
TORQUE CONVERTER SERVICE
The torque converter should be replaced under any of the following conditions:

External leaks in the hub weld area.

Converter hub is scored or damaged.

Converter pilot is broken, damaged or fits poorly into crankshaft.

Steel particles are found after flushing the cooler and cooler lines.

Pump is damaged or steel particles are found in the converter.

Vehicle has TCC shudder and/or no TCC apply. Replace only after all hydraulic and electrical diagnoses
have been made. (Converter clutch material may be glazed.)

Converter is contaminated with engine coolant containing antifreeze.

Internal malfunction of stator roller clutch.

Heavy clutch debris due to overheating (blue converter).

Steel particles or clutch lining material found in fluid filter or on magnet when no internal parts in unit are
worn or damaged — indicates that lining material came from converter.
The torque converter should not be replaced if:

The fluid has an odor, is discolored, and there is no evidence of metal or clutch facing particles.

The threads in one or more of the converter bolt holes are damaged.

Transaxle malfunction did not display evidence of damaged or worn internal parts, steel particles or clutch
plate lining material in unit and inside the fluid filter.

Vehicle has been exposed to high mileage (only). The exception may be where the torque converter
clutch dampener plate lining has seen excess wear by vehicles operated in heavy and/or constant traffic,
such as taxi, delivery or police use.

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

TROUBLE DIAGNOSIS
ATC-35
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AT C

How to Perform Trouble Diagnosis for Quick and Accurate RepairBJS000FS
WORK FLOW
SYMPTOM TABLE
*1AT C - 5 4 , "Operational Check"
SHA900E
Symptom Reference Page
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C System.ATC-56, "
Power
Supply and
Ground Circuit for
Auto Amp."
A/C system cannot be controlled.
Go to Integrated Display System.

Go to Integrated Color Display System.AV- 5 8 , "
Unable to
Operate System
with A/C and AV
Switch" (Inte-
grated display sys-
tem), AV-97,
"Unable to Oper-
ate System with A/
C and AV Switch"
(Integrated color
display system)
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN)AT C - 6 3 , "
Mode
Door Motor Cir-
cuit"Mode door motor does not operate normally.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor. (LAN)ATC-66, "
Air Mix
Door Motor Cir-
cuit"Air mix door motor does not operate nor-
mally.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor. (LAN)AT C - 6 9 , "
Intake
Door Motor Cir-
cuit" Intake door motor does not operate normally.
Blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Blower Motor.ATC-72, "
Blower
Motor Circuit"
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch.AT C - 7 8 , "Magnet
Clutch Circuit"
Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling.AT C - 8 4 , "Insuffi-
cient Cooling"
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating.AT C - 9 1 , "Insuffi-
cient Heating"
Noise Go to Trouble Diagnosis Procedure for Noise.ATC-92, "Noise"
Self-diagnosis cannot be performed. Go to Trouble Diagnosis Procedure for Self-diagnosis.AT C - 9 4 , "Self-
diagnosis"
Memory function does not operate. Go to Trouble Diagnosis Procedure for Memory Function.AT C - 9 5 , "Memory
Function"

TROUBLE DIAGNOSIS
ATC-55
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AT C

CHECKING TEMPERATURE INCREASE
1. Press temperature control switch (UP, driver side) until 32°C is displayed.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for AT C - 9 1 , "
Insufficient Heating" .
If OK, continue the check.
CHECKING A/C SWITCH
1. Press AUTO switch and A/C switch.
2. A/C switch indicator will turn ON.

Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for AT C - 7 8 , "
Magnet Clutch Circuit" .
If OK, continue the check.
CHECKING AUTO MODE
1. Press AUTO switch and A/C switch.
2. Display should indicate AUTO.

Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower
speed will depend on ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for AT C - 5 6 , "
Power Supply and Ground Circuit for Auto Amp." , then
if necessary, trouble diagnosis procedure for AT C - 7 8 , "
Magnet Clutch Circuit" .
If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in GI-24,
"How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driv-
ing conditions environment. If symptom appears, refer to AT C - 3 5 , "
SYMPTOM TABLE" and perform applica-
ble trouble diagnosis procedures.

TROUBLE DIAGNOSIS
ATC-91
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AT C

Insufficient HeatingBJS000G8
SYMPTOM: Insufficient heating
INSPECTION FLOW
*1ATC-54, "Operational Check"*2ATC-66, "Air Mix Door Motor Circuit"*3AT C - 4 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to
6.
*4ATC-47, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.*5ATC-59, "
LAN System Circuit"*6AT C - 7 2 , "Blower Motor Circuit"
*7EC-131, "DTC P0117, P0118 ECT
SENSOR" (QR engine) or EC-474,
"DTC P0117, P0118 ECT SEN-
SOR" (VQ engine)*8CO-10, "
Changing Engine Coolant"
(QR engine) or CO-34, "
Changing
Engine Coolant" (VQ engine)*9CO-14, "
Checking Radiator Cap"
(QR engine) or CO-38, "
Checking
Radiator Cap" (VQ engine)
RJIA3273E

CO-1
ENGINE COOLING SYSTEM
B ENGINE
CONTENTS
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SECTION CO
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ENGINE COOLING SYSTEM
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PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Liquid Gasket .................................. 3
REMOVAL OF LIQUID GASKET SEALING .......... 3
LIQUID GASKET APPLICATION PROCEDURE ..... 3
PREPARATION ........................................................... 5
Special Service Tools ............................................... 5
Commercial Service Tools ........................................ 5
OVERHEATING CAUSE ANALYSIS .......................... 6
Troubleshooting Chart .............................................. 6
COOLING SYSTEM .................................................... 8
Cooling Circuit .......................................................... 8
System Chart ........................................................... 9
ENGINE COOLANT .................................................. 10
Inspection ............................................................... 10
LEVEL CHECK ................................................... 10
LEAK CHECK ..................................................... 10
Changing Engine Coolant ...................................... 10
DRAINING ENGINE COOLANT ......................... 10
REFILLING ENGINE COOLANT ......................... 11
FLUSHING COOLING SYSTEM ......................... 12
RADIATOR ................................................................ 13
Removal and Installation ........................................ 13
REMOVAL ........................................................... 13
INSTALLATION ................................................... 14
INSPECTION AFTER INSTALLATION ............... 14
Checking Radiator Cap .......................................... 14
Checking Radiator .................................................. 15
RADIATOR (ALUMINUM TYPE) .............................. 16
Disassembly and Assembly ................................... 16
PREPARATION ................................................... 16
DISASSEMBLY ................................................... 16
ASSEMBLY ......................................................... 17
INSPECTION ...................................................... 19
COOLING FAN ......................................................... 20
Removal and Installation ........................................ 20
REMOVAL ........................................................... 20INSTALLATION ................................................... 20
INSPECTION AFTER INSTALLATION ................ 20
Disassembly and Assembly .................................... 21
DISASSEMBLY ................................................... 21
INSPECTION AFTER DISASSEMBLY ................ 21
ASSEMBLY ......................................................... 21
WATER PUMP .......................................................... 22
Removal and Installation ........................................ 22
REMOVAL ........................................................... 22
INSPECTION AFTER REMOVAL ....................... 23
INSTALLATION ................................................... 23
INSPECTION AFTER INSTALLATION ................ 23
THERMOSTAT AND WATER CONTROL VALVE .... 24
Removal and Installation ........................................ 24
REMOVAL ........................................................... 24
INSPECTION AFTER REMOVAL ....................... 25
INSTALLATION ................................................... 25
INSPECTION AFTER INSTALLATION ................ 25
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 26
Standard and Limit .................................................. 26
ENGINE COOLANT CAPACITY (APPROXI-
MATE) .................................................................. 26
THERMOSTAT .................................................... 26
WATER CONTROL VALVE ................................. 26
RADIATOR .......................................................... 26
VQ
PRECAUTIONS ........................................................ 27
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ................................................................. 27
Precautions for Liquid Gasket ................................ 27
REMOVAL OF LIQUID GASKET SEALING ........ 27
LIQUID GASKET APPLICATION PROCEDURE ... 27
PREPARATION ......................................................... 29
Special Service Tools ............................................. 29
Commercial Service Tools ...................................... 29
OVERHEATING CAUSE ANALYSIS ........................ 30
Troubleshooting Chart ............................................ 30

PRECAUTIONS
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[QR]PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
BBS0059V
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:

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

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal 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 Liquid GasketBBS005AV
REMOVAL OF LIQUID GASKET SEALING

After removing mounting nuts and bolts, separate the mating
surface using seal cutter (SST) and remove old liquid gasket
sealing.
CAUTION:
Be careful not to damage the mating surfaces.

Tap seal cutter to insert it, and then slide it by tapping on the
side as shown in the figure.

In areas where seal cutter (SST) is difficult to use, use plastic
hammer to lightly tap the parts, to remove it.
CAUTION:
If for some unavoidable reason tool such as screwdriver is
used, be careful not to damage the mating surfaces.
LIQUID GASKET APPLICATION PROCEDURE
1. Using scraper, remove old liquid gasket adhering to the liquid
gasket application surface and the mating surface.

Remove liquid gasket completely from the groove of the liquid
gasket application surface, mounting bolts, and bolt holes.
2. Wipe the liquid gasket application surface and the mating sur-
face with white gasoline (lighting and heating use) to remove
adhering moisture, grease and foreign materials.
3. Attach liquid gasket tube to tube presser (SST).
Use Genuine Liquid Gasket or equivalent.
4. Apply liquid gasket without breaks to the specified location with
the specified dimensions.

If there is a groove for the liquid gasket application, apply liq-
uid gasket to the groove.
PBIC0275E
PBIC0003E
PBIC2160E

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OVERHEATING CAUSE ANALYSIS

OVERHEATING CAUSE ANALYSISPFP:00012
Troubleshooting ChartBBS0059Z
Symptom Check items
Cooling sys-
tem parts
malfunctionPoor heat transferWater pump malfunction Worn or loose drive belt
— Thermostat and water con-
trol valve stuck closed—
Damaged finsDust contamination or
paper clogging
Physical damage
Clogged radiator cooling
tubeExcess foreign material
(rust, dirt, sand, etc.)
Reduced air flowCooling fan does not oper-
ate
Fan assembly — High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud — — —
Improper engine coolant
mixture ratio—— —
Poor engine coolant quality — Engine coolant viscosity —
Insufficient engine coolantEngine coolant leaksCooling hoseLoose clamp
Cracked hose
Water pump Poor sealing
Radiator capLoose
Poor sealing
RadiatorO-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tankExhaust gas leaks into
cooling systemCylinder head deterioration
Cylinder head gasket dete-
rioration