Theory Of Operation

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

The Charge Air Cooler Temperature Sensor circuit is represented as the Intake Manifold Temperature Sensor circuit on the Cab and Chassis. On the Regular Cab it is still called the Charge Air Cooler Temperature Sensor circuit. In both configurations, this DTC refers to the circuit that runs from the Powertrain Control Module (PCM) C1 harness connector / terminal 62 to the Temperature/Pressure MAP sensor / terminal 3. The Powertrain Control Module (PCM) supplies 5-Volts to the Charge Air Cooler Temperature signal circuit. The PCM monitors the change in voltage caused by changes in the resistance of the sensor to determine the Charge Air Cooler temperature. The PCM will illuminate the Malfunction Indicator Lamp (MIL) after the diagnostic runs and fails in two consecutive drive cycles. During this time the customer may notice periods of white smoke as well as the fan running more often. The MIL lamp is turned off once the diagnostic runs and passes in four consecutive drive cycles.