Temperature sensor NISSAN TEANA 2003 Service Manual

EC-730
[VQ]
IAT SENSOR

IAT SENSORPFP:22630
Component DescriptionBBS0055J
The intake air temperature sensor is built-into mass air flow sensor.
The sensor detects intake air temperature and transmits a signal to
the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.

*: These data are reference values and are measured between ECM terminal 34
(Intake air temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output
voltage. Doing so may result in damage to the ECM's transistor.
Use a ground other than ECM terminals, such as the ground.
PBIB1604E
Intake air temperature
°C (°F)Voltage* V Resistance kΩ
25 (77) 3.3 1.800 - 2.200
80 (176) 1.2 0.283 - 0.359
SEF012P

IAT SENSOR
EC-733
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3. CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor (intake air temperature sensor
is built-into) harness connector.
3. Turn ignition switch ON.
4. Check voltage between mass air flow sensor terminal 2 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connectors.
4. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between mass air flow sensor terminal 1 and ECM terminal 67.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to EC-734, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace mass air flow sensor (with intake air temperature sensor).
6. CHECK INTERMITTENT INCIDENT
Refer to EC-450, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
PBIB2105E
Voltage: Approximately 5V
PBIB1598E
Continuity should exist.

EC-734
[VQ]
IAT SENSOR

Component InspectionBBS0055M
INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between mass air flow sensor terminals 1 and
2 under the following conditions.
2. If NG, replace mass air flow sensor (with intake air temperature
sensor).
Removal and InstallationBBS0055N
MASS AIR FLOW SENSOR
Refer to EM-131, "AIR CLEANER AND AIR DUCT" .
Intake air temperature °C (°F) Resistance kΩ
25 (77) 1.800 - 2.200
PBIB1604E
SEF012P

EC-750
[VQ]
REFRIGERANT PRESSURE SENSOR

Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic ProcedureBBS00571
1. CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower fan switch ON.
3. Check voltage between ECM terminal 70 and ground with CON-
SULT-II or tester.
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
2. CHECK GROUND CONNECTIONS
1. Turn A/C switch and blower fan switch OFF.
2. Turn ignition switch OFF.
3. Loosen and retighten two ground screws on the body.
Refer to EC-457, "
Ground Inspection" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace ground connections.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
49 BR/WSensor power supply
(Refrigerant pressure sen-
sor)[Ignition switch: ON]Approximately 5V
67 B Sensor ground[Engine is running]

Warm-up condition

Idle speedApproximately 0V
70 W Refrigerant pressure sensor[Engine is running]

Warm-up condition

Both A/C switch and blower fan switch: ON
(Compressor operates.)1.0 - 4.0V
Voltage: 1.0 - 4.0V
PBIB1188E
PBIB2160E

VIAS
EC-753
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VIASPFP:14956
DescriptionBBS00565
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
When the engine is running at medium speed, the ECM sends the ON signal to the VIAS control solenoid
valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore closes
the power valve.
Under this condition, the effective intake manifold length is equivalent to the total length of passage A and pas-
sage B. This long intake manifold provides increased amount of intake air, which results in improved suction
efficiency and higher torque.
When engine is running at low or high speed, the ECM sends the OFF signal to the VIAS control solenoid
valve and the power valve is opened.
Under this condition, the effective intake manifold length is equivalent to the length of passage B. This short-
ened intake manifold length results in enhanced engine output due to reduced suction resistance under high
speeds.
COMPONENT DESCRIPTION
Power Valve
The power valve is installed in intake manifold collector and used to
control the suction passage of the variable induction air control sys-
tem. It is set in the fully closed or fully opened position by the power
valve actuator operated by the vacuum stored in the surge tank. The
vacuum in the surge tank is controlled by the VIAS control solenoid
valve.
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
VIAS control VIAS control solenoid valve Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Battery Battery voltage*
PBIB1822E
PBIB2108E

SERVICE DATA AND SPECIFICATIONS (SDS)
EC-765
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SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00030
Fuel PressureBBS0057G
Idle Speed and Ignition TimingBBS0057H
*: Under the following conditions:

Air conditioner switch: OFF

Electric load: OFF (Lights, heater fan & rear window defogger)

Steering wheel: Kept in straight-ahead position
Mass Air Flow SensorBBS0057I
*: Engine is warmed up to normal operating temperature and running under no load.
Intake Air Temperature SensorBBS0057J
Engine Coolant Temperature SensorBBS0057K
Heated Oxygen Sensor 1 HeaterBBS0057L
Heated Oxygen sensor 2 HeaterBBS0057M
Crankshaft Position Sensor (POS)BBS0057N
Refer to EC-523, "Component Inspection" .
Camshaft Position Sensor (PHASE)BBS0057O
Refer to EC-532, "Component Inspection" .
Throttle Control MotorBBS0057P
Fuel InjectorBBS0057Q
Fuel pressure at idling kPa (bar, kg/cm2 , psi)Approximately 350 (3.5, 3.57, 51)
Target idle speed No load* (in P or N position)VQ23DE: 700 ± 50 rpm
VQ35DE: 625 ± 50 rpm
Air conditioner: ONIn P or N position VQ23DE: 750 rpm or more
VQ35DE: 700 rpm or more
Ignition timing In P or N position 15 ± 5° BTDC
Supply voltageBattery voltage (11 - 14V)
Output voltage at idle0.9 - 1.1V (VQ23DE engine)*
1.0 - 1.3V (VQ35DE engine)*
Temperature °C (°F) Resistance kΩ
25 (77)1.800 - 2.200
80 (176)0.283 - 0.359
Temperature °C (°F)Resistance kΩ
20 (68)2.1 - 2.9
50 (122)0.68 - 1.00
90 (194)0.236 - 0.260
Resistance [at 25°C (77°F)] 3.3 - 4.0Ω
Resistance [at 25°C (77°F)] 5.0 - 7.0Ω
Resistance [at 25°C (77°F)] Approximately 1 - 15Ω
Resistance [at 10 - 60°C (50 - 140°F)]VQ23DE: 13.5 - 17.5Ω
VQ35DE: 11.1 - 14.5Ω

GI-6
PRECAUTIONS

WARNING:
To prevent ECM from storing the diagnostic trouble codes, do not carelessly disconnect the harness
connectors which are related to the engine control system and TCM (transmission control module)
system. The connectors should be disconnected only when working according to the WORK FLOW of
TROUBLE DIAGNOSES in EC and AT sections.
Precautions for Three Way CatalystBAS00074
If a large amount of unburned fuel flows into the catalyst, the catalyst temperature will be excessively high. To
prevent this, follow the instructions.

Use unleaded gasoline only. Leaded gasoline will seriously damage the three way catalyst.

When checking for ignition spark or measuring engine compression, make tests quickly and only when
necessary.

Do not run engine when the fuel tank level is low, otherwise the engine may misfire, causing damage to
the catalyst.
Do not place the vehicle on flammable material. Keep flammable material off the exhaust pipe and the three
way catalyst.
Precautions for FuelBAS0008E
QR20DE/VQ23DE ENGINE (REGULAR GASOLINE, UNLEADED PREMIUM GASOLINE RECOM-
MENDED)
Use unleaded regular gasoline with an octane rating of at least 91 RON (research octane number).
CAUTION:
Do not use leaded gasoline. Using leaded gasoline will damage the three way catalyst. Using a fuel
other than that specified could adversely affect the emission control devices and systems, and could
also affect the warranty coverage validity.
VQ35DE ENGINE (PREMIUM GASOLINE)
Use unleaded premium gasoline with an octane rating of at least 95 RON (research octane number).
If unleaded premium gasoline is not available, unleaded regular gasoline with an octane rating of at least 91
RON (research octane number) can be used, but only under the following precautions:

have the fuel tank filled only partially with unleaded regular gasoline, and fill up with unleaded premium
gasoline as soon as possible.

avoid full throttle driving and abrupt acceleration.
However, for maximum vehicle performance, the use of unleaded premium gasoline is recommended.
CAUTION:
Do not use leaded gasoline. Using leaded gasoline will damage the three way catalyst. Using a fuel
other than that specified could adversely affect the emission control devices and systems, and could
also affect the warranty coverage validity.
Precautions for Multiport Fuel Injection System or Engine Control SystemBAS0008F

Before connecting or disconnecting any harness connector for
the multiport fuel injection system or ECM:
Turn ignition switch to “OFF” position.
Disconnect negative battery terminal.
Otherwise, there may be damage to ECM.

Before disconnecting pressurized fuel line from fuel pump to
injectors, be sure to release fuel pressure.

Be careful not to jar components such as ECM and mass air
flow sensor.
SGI787

TERMINOLOGY
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TERMINOLOGYPFP:00011
SAE J1930 Terminology List BAS00081
All emission related terms used in this publication in accordance with SAE J1930 are listed. Accordingly, new
terms, new acronyms/abbreviations and old terms are listed in the following chart.
NEW TERMNEW ACRONYM /
ABBREVIATIONOLD TERM
Air cleaner ACL Air cleaner
Barometric pressure BARO ***
Barometric pressure sensor-BCDD BAROS-BCDD BCDD
Camshaft position CMP ***
Camshaft position sensor CMPS Crank angle sensor
Canister *** Canister
Carburetor CARB Carburetor
Charge air cooler CAC Intercooler
Closed loop CL Closed loop
Closed throttle position switch CTP switch Idle switch
Clutch pedal position switch CPP switch Clutch switch
Continuous fuel injection system CFI system ***
Continuous trap oxidizer system CTOX system ***
Crankshaft position CKP ***
Crankshaft position sensor CKPS ***
Data link connector DLC ***
Data link connector for CONSULT-II DLC for CONSULT-II Diagnostic connector for CONSULT-II
Diagnostic test mode DTM Diagnostic mode
Diagnostic test mode selector DTM selector Diagnostic mode selector
Diagnostic test mode I DTM I Mode I
Diagnostic test mode II DTM II Mode II
Diagnostic trouble code DTC Malfunction code
Direct fuel injection system DFI system ***
Distributor ignition system DI system Ignition timing control
Early fuel evaporation-mixture heater EFE-mixture heater Mixture heater
Early fuel evaporation system EFE system Mixture heater control
Electrically erasable programmable read
only memoryEEPROM ***
Electronic ignition system EI system Ignition timing control
Engine control EC ***
Engine control module ECM ECCS control unit
Engine coolant temperature ECT Engine temperature
Engine coolant temperature sensor ECTS Engine temperature sensor
Engine modification EM ***
Engine speed RPM Engine speed
Erasable programmable read only memory EPROM ***
Evaporative emission canister EVAP canister Canister
Evaporative emission system EVAP system Canister control solenoid valve
Exhaust gas recirculation valve EGR valve EGR valve

GI-46
TERMINOLOGY

Exhaust gas recirculation control-BPT
valveEGRC-BPT valve BPT valve
Exhaust gas recirculation control-solenoid
valveEGRC-solenoid valve EGR control solenoid valve
Exhaust gas recirculation temperature sen-
sor
EGRT sensor Exhaust gas temperature sensor
EGR temperature sensor
Flash electrically erasable programmable
read only memoryFEEPROM ***
Flash erasable programmable read only
memoryFEPROM ***
Flexible fuel sensor FFS ***
Flexible fuel system FF system ***
Fuel pressure regulator *** Pressure regulator
Fuel pressure regulator control solenoid
valve*** PRVR control solenoid valve
Fuel trim FT ***
Heated Oxygen sensor HO2S Exhaust gas sensor
Idle air control system IAC system Idle speed control
Idle air control valve-air regulator IACV-air regulator Air regulator
Idle air control valve-auxiliary air control
valveIACV-AAC valve Auxiliary air control (AAC) valve
Idle air control valve-FICD solenoid valve IACV-FICD solenoid valve FICD solenoid valve
Idle air control valve-idle up control sole-
noid valveIACV-idle up control solenoid valve Idle up control solenoid valve
Idle speed control-FI pot ISC-FI pot FI pot
Idle speed control system ISC system ***
Ignition control IC ***
Ignition control module ICM ***
Indirect fuel injection system IFI system ***
Intake air IA Air
Intake air temperature sensor IAT sensor Air temperature sensor
Knock *** Detonation
Knock sensor KS Detonation sensor
Malfunction indicator lamp MIL Check engine light
Manifold absolute pressure MAP ***
Manifold absolute pressure sensor MAPS ***
Manifold differential pressure MDP ***
Manifold differential pressure sensor MDPS ***
Manifold surface temperature MST ***
Manifold surface temperature sensor MSTS ***
Manifold vacuum zone MVZ ***
Manifold vacuum zone sensor MVZS ***
Mass air flow sensor MAFS Air flow meter
Mixture control solenoid valve MC solenoid valve Air-fuel ratio control solenoid valve
Multiport fuel injection System MFI system Fuel injection controlNEW TERMNEW ACRONYM /
ABBREVIATIONOLD TERM

IDX-4
ALPHABETICAL INDEX
Electric throttle control actuator (VQ23DE and VQ35DE)
EM-137
Electrical load signal circuit ................ EC-280, EC-670
Electrical unit ..................................................... PG-74
Electrical units location ...................................... PG-67
Electronic ignition (EI) system ............. EC-23, EC-360
EMNT - Wiring diagram ................................... EC-673
ENG SS - Wiring diagram ................................ AT-117
Engine control circuit diagram ............. EC-70, EC-413
Engine control component parts location .......... EC-64,
EC-406
Engine control module (ECM) ............ EC-190, EC-538
Engine control system diagram and chart ........ EC-20,
EC-357
Engine coolant temperature sensor (ECTS) ... EC-131,
EC-474
Engine coolant(QR20DE) ................................. CO-10
Engine coolant(VQ23DE and VQ35DE) ........... CO-34
Engine fail-safe system ........................ EC-59, EC-401
Engine mounting control (Front) ...................... EC-672
Engine oil filter replacement(QR20DE) ............. MA-21
Engine oil filter replacement(VQ23DE and VQ35DE) ...
MA-31
Engine oil precautions .......................................... GI-8
Engine oil replacement(QR20DE) .................... MA-20
Engine oil replacementVQ23DE and VQ35DE . MA-30
Engine oil(QR20DE) ............................................ LU-7
Engine oil(VQ23DE and VQ35DE) .................... LU-19
Engine removal(QR20DE) ................................ EM-77
Engine removal(VQ23DE and VQ35DE) ........ EM-223
Engine trouble diagnoses ................................ EC-394
ETC1 - Wiring diagram ...................... EC-201, EC-556
ETC2 - Wiring diagram ...................... EC-209, EC-564
ETC3 - Wiring diagram ...................... EC-214, EC-569
EVAP canister ...................................... EC-29, EC-369
EVAP canister purge volume control solenoid valve ....
EC-282
, EC-677
EVAP vapor lines inspection ............................. MA-23
EVAP vapor lines inspection(VQ23DE and VQ35DE) ..
MA-34
EVAP vapor lines inspectionVQ23DE and VQ35DE ....
MA-33
Evaporative emission (EVAP) system . EC-27, EC-366
Evaporator ..................................................... ATC-144
Exhaust manifold(QR20DE) ............................. EM-23
Exhaust manifold(VQ23DE and VQ35DE) ..... EM-140
Exhaust system ................................................... EX-2
Exhaust system inspection ..................... EX-2, MA-35
Expansion valve ............................................. ATC-145
F
F/FOG - Wiring diagram ................................... LT-129
F/LID - Wiring diagram ....................................... BL-45
F/PUMP - Wiring diagram .................. EC-296, EC-691
Floor trim ............................................................. EI-52
Flow charts ......................................................... GI-24
Fluid temparature sensor (CVT) ...................... CVT-69
Fluids ................................................................ MA-14
Fluorescent leak detector ............................. ATC-146
Fog lamp, front ................................................. LT-126
Freeze frame data .............................. EC-35, EC-376
FRO2 - Wiring diagram ..................... EC-302, EC-309
FRO2B1 - Wiring diagram ................ EC-697, EC-707
FRO2B2 - Wiring diagram ................ EC-699, EC-709
Front bumper ...................................................... EI-14
Front door ............................. BL-119, BL-123, GW-46
Front fog lamp .................................................. LT-126
Front passenger air bag .................................. SRS-39
Front seat belt ...................................................... SB-3
Front seat belt pre-tensioner ..... SB-2, SRS-3, SRS-46
Front side air bag ............................................ SRS-40
Front washer ...................................................... WW-4
Front wiper ......................................................... WW-4
FTS - Wiring diagram ...................................... CVT-70
Fuel cut control (at no load high engine speed) EC-24,
EC-361
Fuel gauge ............................................................ DI-4
Fuel injector and fuel tube(QR20DE) ................ EM-34
Fuel injector and fuel tube(VQ23DE and VQ35DE) ......
EM-155
Fuel lid opener, electric ...................................... BL-44
Fuel line inspection .............................................. FL-3
Fuel line inspection(QR20DE) .......................... MA-20
Fuel line inspectionVQ23DE and VQ35DE ....... MA-30
Fuel pressure check ........................... EC-49, EC-392
Fuel pressure release ......................... EC-49, EC-392
Fuel pump ......................................... EC-295, EC-690
Fuel pump and gauge .......................................... FL-4
Fuel system ......................................................... FL-3
Fuel tank .............................................................. FL-8
Fuel tank vacuum relief valve ............. EC-29, EC-369
Fuse .................................................................. PG-16
Fuse and fusible link box .................................. PG-80
Fusible link ........................................................ PG-16
G
Gauges ................................................................. DI-4
Glass ...................................... GW-11, GW-46, GW-50
Grease .............................................................. MA-14
Grille - See Exterior ............................................ EI-20
Ground distribution ........................................... PG-29
H
H/AIM - Wiring diagram ................................... LT-122
H/LAMP - Wiring diagram .................................. LT-42
Harness connector ............................................ PG-71
Harness layout .................................................. PG-42
Hazard warning lamp ....................................... LT-152
Headlamp aiming control ...................... LT-99, LT-122
Headlamp leveler - See Headlamp aiming control ........
LT-122
Headlining - See Roof trim .................................. EI-54
Heated oxygen sensor 1 ..... EC-143, EC-150, EC-301
Heated oxygen sensor 1 (bank 1) .... EC-486, EC-496,
EC-696