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 Powertrain Control Module (PCM) controls the operation of the Intake Air Diverter (IAD) Valve. The IAD Valve also has a built in position sensor. The IAD Valve is located in the Airbox. The PCM monitors the IAD Valve Signal circuit to determine if the IAD Valve is moving to the proper position commanded by the PCM. The PCM will illuminate the EVIC message: 'Active Airbox Service Required-See Dealer'. The PCM will turn off the EVIC message when the condition is corrected.