DTC P0401: Notes
DTC P0401 [AJ] DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0401 |
EGR flow insufficient detected |
| DETECTION CONDITION |
- PCM monitors difference in intake manifold pressures when EGR is operated and when it is stopped. If the difference is too small, PCM determines that EGR flow insufficient.
Diagnostic support note
- This is an intermittent monitor (EGR).
- The 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 the first drive cycle.
- DIAGNOSTIC MONITORING TEST RESULTS is available.
- FREEZE FRAME DATA is available.
- DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- EGR valve malfunction
- EGR boost sensor malfunction
- EGR boost sensor solenoid valve malfunction
- EGR gasket malfunction
- PCM malfunction
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