Escort ZX2 L4-2.0L DOHC VIN 3 (2000)
Intake Air Temperature Sensor: Description and Operation
Intake Air Temperature Sensor
Intake Air Temperature (IAT)
The PCM uses the Intake Air Temperature (IAT) sensor signal to proportion the cold enrichment fuel flow and as a density corrector for air flow
calculations. The IAT sensor is incorporated into the MAF sensor and repaired as an assembly with the MAF sensor.
The Intake Air Temperature (IAT) sensors 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.
Diagram Of Flow Through Throttle Body (Containing IAT Sensor Wire Where Applicable)
Some MAF sensors have Integrated Bypass Technology (IBT) with an integrated Intake Air Temperature (IAT) sensor. The present applications with
IBT are: Focus, Escort (4V), 2.0 L Contour/Mystique, Cougar, Taurus/Sable, Windstar, Explorer/Mountaineer and E-Series.
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.
