Circuit/System Description

The offset of the EGR valve is checked after the offset learning has been completed in after-run/post drive. The difference between the maximum and minimum EGR valve offset values is calculated by the engine control module (ECM). If the difference is above a calibrated threshold or the offset learned value is not within a calibrated range, a fault is recognized. While the offset learning is active, the EGR valve is checked for a stuck valve. If the valve is stuck during opening or closing for a calibrated time, a fault is reported. If either of these conditions occur, the DTC will be set.