DTC Detection Logic
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The Engine Control Module (ECM) detected the actual EGR flow was less than what was being commanded based on the current engine operating conditions.
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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P0401-00 |
EGR_SYSTEM (Exhaust Gas Recirculation Flow Insufficient Detected) |
Diagnosis condition |
Engine running. |
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Signal (terminal) |
(-) |
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Threshold |
Cumulative sum of error (estimated flow - measured flow) over a 120 second period is ever > 3000 kg/min, which is equivalent to (average of error - tolerance) > 2.5 kg/min, where tolerance is defined as 0 kg/min |
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Diagnosis delay time |
Diagnostic runs continuously when the engine is running |
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