Charge Air Cooler Temperature (CACT) Sensor
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The CACT sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical voltage signals to the PCM corresponding to temperature.
The CACT sensor is located in the tube between the charge air cooler (CAC) and the intake throttle assembly. The sensor provides a charge air cooler output temperature signal to the PCM. The PCM uses the CACT signal as an input to control the turbocharger, exhaust recirculation (EGR) valve, fuel system and the regeneration function.