DTC P0401: Exhaust Gas Recirculation Flow Insufficient Detected [10/2014 - 09/2015]: Description
Based on the driving conditions, the ECM regulates the volume of exhaust gas that is recirculated to the engine's combustion chambers and thus lowers the combustion temperature to reduce NOx emissions. The ECM monitors signals such as engine speed, engine coolant temperature, electric load, and vehicle speed. When the EGR permission conditions are fulfilled, the ECM controls the opening of the EGR valve linearly through signals to the EGR step motor.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0401 | Exhaust Gas Recirculation Flow Insufficient Detected | Change in intake manifold pressure is small when the EGR valve opened and closed during fuel cut operation. (2 trip detection logic) |
|
Comes on | DTC stored |