IAT SENSOR FOR 2004 Nissan Tiran - 2004 Nissan Titan

If you mean the Intake air temp sensor it is built into the air flow meter

this car a 2005 altima does not use a iat( intake air temp sensor).what is wrong with the car?

The Mass Air Flow (MAF) sensor/Intake Air Temperature (IAT) sensor is located in the air cleaner case.
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The Intake Air Temperature (IAT) sensor is an integral part of the Mass Air Flow (MAF) sensor. Looks like this:

Relates to problem with I.A.T. sensor/circuit. Normally replacing I.A.T. sensor will fix it.
I.A.T. = Incoming Air Temperature.

It could be any of the following
Internally failed IAT sensor
Faulty connection at IAT sensor
Open in IAT ground circuit or signal circuit
Short to voltage in IAT signal circuit or reference circuit
IAT harness and/or wiring routed too close to high-voltage wiring (e.g. alternator, spark plug cables, etc.)
Faulty PCM (less likely but not impossible)

i believe it is built together with the mass airflow sensor!

Removal and Installation To Remove:

1. Remove or disconnect the following:
   • Mass air flow sensor electrical connector
   • Tube clamp at the electronic throttle control actuator
   • Air cleaner to electronic throttle control actuator tube, upper air cleaner case
   • Mass air flow sensor from the cleaner case.

To Install:

1. Install or connect the following:
   • Mass air flow sensor to the cleaner case
   • Air cleaner to electronic throttle control actuator tube
   • Tube clamp at the electronic throttle control actuator
   • Mass air flow sensor electrical connector

it is the air Intake Temperature Sensor located at the air cleaner housing.

It is small and round (2 wire connector) and located either in the flexiable air intake hose to the engine or in the engine air filter housing.