Charge Air Cooler Temperature (CACT) Sensor
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 powertrain control module (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 powertrain control module (PCM). The PCM uses the CACT signal as an input to control the turbocharger, exhaust recirculation (EGR) valve, fuel system and the regeneration function.