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Location of Intake Air Temperature Sensor:
The intake air temperature sensor, which is mounted on the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature becomes low, the resistance of the thermistor increases When the temperature becomes high, the resistance drops .
Hello! An Inlet air temperature sensor is used to calculate the temperature
near the battery... This temperature data, along with data from monitored
line voltage (battery voltage sense circuit), is used by the PCM to vary
the battery charging rate... This is done by cycling the ground path to
control the strength of the rotor magnetic field... The PCM then
compensates and regulates generator current output accordingly to
maintain system voltage at the targeted system voltage based on battery
temperature... In simple terms the inlet air temperature sensor is defective OR the ground from the negative battery terminal is NOT at zero ohms from terminal to chassis and from terminal to engine block...Check with an ohm meter set on X10 scale (bare metal) of chassis and engine block to negative battery terminal...Must read zero ohms...If not install ground straps... Inlet Air temperature sensor ...See picture below...Is a low cost item <$10...It has 2 wires in its connector ...Colors are...Black/Red and Black/Light Blue...It is located in the tube leading to the air box...
The Inlet Air Temperature sensor (IAT) located in an air passage in the intake manifold measures the incoming air temperature.
Cold air is denser, contains more oxygen, and therefore requires a richer mixture.
REMOVAL & INSTALLATION
Disconnect the negative battery cable.
Disconnect the wiring to the IAT.
Remove the sensor from the intake manifold (MFI engines) or air cleaner/tube (SFI engines).
Clean the sensor area. Install the sensor into the intake manifold
and tighten to 12-15 ft. lbs. (16-24 Nm) on MFI engines. Fasten the
twist-lock part on SFI engines.
Attach the wiring to the unit.
Connect the negative battery cable.
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The intake air temperature sensor on a 6.6L diesel is part of the mass air flow sensor, located just outside the air filter housing, in the intake air snorkle going to the engine. The other one is for the turbo system and is located directly at the top of the engine in the inlet pipe for the turbo. This on is the intake temperature heater / sensor, and will set a totally different code relating to the turbo. The one you want is incorporated with the MAF sensor. Usually code P0101 sets.
Not 100% sure of exact location but IAT stands for "incoming air temperature", so I'd start at air inlet to throttlebody, and look close at intake manifold areas, as well. Should be a small probe into opening.