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.

Aftertreatment DPF intake gas temperature is in-range but not rational. Possible reduced engine performance.

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P2031-00-00	DPF INLET TEMP	Diagnosis condition	Ignition switch ON and the engine is running.
		Signal (terminal)	DEF tank temperature sensor signal.
		Threshold	Difference between DPF inlet and outlet temperature sensor data did not match the expected value for the present engine operating condition. Average temperature drop across DOC > 85°C or average temperature drop across DOC < -85°C. Average temperature drop across DPF > 85°C or average temperature drop across DPF < -85°C.
		Diagnosis delay time	-