Monitored & Set Conditions

System is monitored during engine decel, vehicle speed 4 to 26 MPH, engine coolant temperature greater than 158°F (70°C) and engine run time is greater than 120 seconds. The PCM monitors engine roughness. During decel the EGR is opened and the PCM monitors engine then monitors engine roughness with the valve open. If an increase of engine roughness is not present, DTC will set. DTC is a two trip fault.