DTC P0401: Notes
DTC P0401 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0401 |
EGR flow insufficient detected |
| DETECTION CONDITION |
- PCM monitors the difference in intake manifold pressures when the EGR is operated and when it is stopped. If the difference is too small, the PCM determines that the EGR flow is insufficient.
Diagnostic support note
- This is an intermittent monitor (EGR system).
- MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
- PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
- FREEZE FRAME DATA is available.
- DTCs are stored in the PCM memory.
|
| POSSIBLE CAUSE |
- EGR valve malfunction
- MAP sensor malfunction
- EGR gasket malfunction
- PCM malfunction
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