IAT sensor location

Tiny
BILL QUIRK
  • MEMBER
  • 2002 MERCURY MOUNTAINEER
  • 4.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Where is the IAT sensor on the vehicle listed above?
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Sunday, May 10th, 2020 AT 10:56 AM

3 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

It is part of the mass air flow sensor.

I attached a picture of the sensor and its location.

Roy

The Intake Air Temperature (IAT) sensors (Figure 33) and integrated Mass Air Flow (MAF) type (Figure 36), are thermistor devices in which resistance changes with temperature The electrical resistance of a thermistor decreases as the temperature increases, and increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to temperature.

Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.

Voltage that is dropped across a fixed resistor in a series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.

The IAT provides air temperature information to the PCM. The PCM uses the air temperature information as a correction factor in the calculation of fuel, spark and MAF.

The IAT sensor provides a quicker temperature change response time than the ECT or CHT sensor.

Supercharged vehicles use (2) IAT sensors. Both sensors are thermistor type devices and operate as above. However, one is located before the supercharger at the air cleaner for standard OBD II/cold weather input, while a second sensor (IAT2) is located after the supercharger in the intake manifold. The IAT2 sensor located after the supercharger provides air temperature information to the PCM to control border-line spark and to help determine intercooler efficiency.

Currently two types of IAT2 sensors are used. A screw in type (Figure 33) and an integrated type, witch is part of the Thermal Manifold Absolute Pressure (TMAP) sensor (Figure 40). The TMAP sensor consists of a IAT thermistor and a Manifold Absolute Pressure (MAP) sensor. The thermistor portion of the TMAP is used for IAT2 function and operates in the same manner as a non-integrated IAT2. For additional information on the MAP portion of the TMAP, refer to the Thermal Manifold Absolute Pressure Sensor description and operation.
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Sunday, May 10th, 2020 AT 11:16 AM
Tiny
BILL QUIRK
  • MEMBER
Can you tell me where the outside temperature on the gauge cluster gets the outside temperature from please?
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Sunday, May 10th, 2020 AT 11:36 AM
Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

The sensor is behind the grille on the radiator support.

I attached the procedure and pictures for you.

Roy

REMOVAL
1. Remove the radiator grille.

ImageOpen In New TabZoom/Print

2. Remove the three upper pin-type retainers in the radiator air deflector.

ImageOpen In New TabZoom/Print

3. Position forward the air deflector.

ImageOpen In New TabZoom/Print

4. Remove the ambient air temperature sensor.
1 Detach the pin-type retainer.
2 Disconnect the electrical connector.
Remove the ambient air temperature sensor.
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Sunday, May 10th, 2020 AT 11:52 AM

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