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Re: having trouble locating
The IAT is in the air cleaner box or the air intake hose to the engine, it measures intake air temperture (IAT), the fuel line runs along the frame rail on the drivers side, crawl under the truck you will see it, it is a 3/8" metal or black plastic line from the fuel tank
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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.
The Fuel Level Sending Unit, or Fuel Level Sensor, is located in your gas tank with the Fuel Pump Module. The fuel gauge sending unit (fuel level sensor) is attached to the side of the fuel pump module. The sending unit consists of a float, an arm, and a variable resistor track (card).
The Fuel Pressure Regulator is located within fuel pump module. The fuel pressure regulator controls fuel system pressure. The PCM cannot detect a clogged fuel pump inlet filter, clogged in-line fuel filter, or a pinched fuel supply or return line. However, these could result in a rich or lean condition causing the PCM to store an oxygen sensor or fuel system diagnostic trouble code.
Both of these sensors are connected with the Fuel Pump Module. Here is a diagram:
The Intake Air Temperature (IAT) sensor determines the air temperature
inside the intake manifold. Resistance changes in response to the
ambient air temperature. The sensor has a negative temperature
coefficient. As the temperature of the sensor rises the resistance
across the sensor decreases. This provides a signal to the PCM
indicating the temperature of the incoming air charge. This sensor helps
the PCM to determine spark timing and air/fuel ratio. Information from
this sensor is added to the pressure sensor information to calculate the
air mass being sent to the cylinders. The IAT is a two wire sensor, a
5-volt reference signal is sent to the sensor and the signal return is
based upon the change in the measured resistance due to temperature.
Fig. 1: The IAT sensor is located in the air cleaner outlet
tube-2.2L engine and 2.4L engine
Trouble Code Conditions:
Check with ignition on or engine running; battery voltage more than 10v; The PCM detected the IAT Sensor input was over 4.90v (exc. Dakota, Durango, Ram) or 4.98v (Dakota, Durango, Ram) for 3 seconds.
IAT Sensor signal circuit shorted to VREF (5v)
IAT Sensor signal circuit is open, or the ground circuit is open
IAT Sensor is damaged or it has failed (an internal open circuit)
If your looking for the Intake Air Temp/Manifold Absolute Pressure sensor (IAT/MAP)(2003 model year and up) It is on the top of the intake manifold, just to the left of the #3 injector fuel line. There are 2 small Torx screws holding it.
Your intake air temperature sensor is part of the MAF (mass airflow sensor) and located right off the air filter housing in the large tube going to the throttle body.Its held on with 2 screws and has a 5 wire electrical plug going to it.