Where is the IAT sensor on a 2002 for F150 with a 4.6 v8 and how do i test it with a DMM

You can find it in the air tube that hooks into the throttle body. About six inches before they connect.

Before I give you my answer I need to advise you, if you have an aftermarket/performance air intake, it will trip an IAT code pretty often, you will either have to live with it or try to find a "dummy" sensor (a fake IAT sensor designed for cold air intakes that will make your engine computer think the incoming air is a certain temperature) if you dont have an intake:

Chances are if the IAT code is coming up (assuming you do not have a cold air intake system) your IAT sensor is probably bad. There is a very long and tedious process of testing the sensor and the circuit for the sensor, but with the average price of a new IAT sensor being around $12 I pretty much always suggest just replacing the sensor. On your vehicle the IAT is part of the mass air sensor assembly, but can be replaced independanlty, and shouldn't be a very difficult replacement.

The 2-wire Intake Manifold Air Temperature (IAT) sensor is installed in the intake manifold with the sensor element extending into the air stream. It sits on the left side of the engine above the Idle Air Control motor. Hope this helps.

Hi Mike:
The IAT sensor is an integral part of the Mass Airflow Sensor, located on the air filter box. The MAF sensor has 5 wires. The yellow wire with the green stripe is the output from the IAT and feeds terminal THA on the ECU.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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it's the sensor on the intake air duct come out of your air filter. the iat sensor is integrated with the maf sensor

on the intake manifold passenger side near the front i think

I assume you are looking for the wiring for the IAT because MAT sensors are no longer used..

here you go

black / white - PCM ground
pink - fused 12-volts
yellow - MAF signal
tan - IAT sensor signal
black - IAT sensor ground

manifold temp. sensors are no loner used.

I believe you are looking for the IAT "intake air temp sensor" which is part of the mass air flow sensor.

good luck

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Here is the location ...

1 - LEFT SIDE OF THROTTLE BODY 2 - ELEC. CONNECT. 3 - IAT SENSOR 4 - RELEASE TAB