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 difference between the after treatment diesel oxidation catalyst intake temperature sensor data and diesel particulate filter intake temperature sensor data did not match the expected value for the present engine operating conditions.

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0544-00	ECM RESERVATION (Exhaust gas temperature sensor circuit bank 1 sensor 1)	Diagnosis condition	Engine running
		Signal (terminal)	(-)
		Threshold	Average temperature drop across DOC > 85 deg C or average temperature across DOC < -85 deg C -85 deg C < average temperature drop across DPF < 85 deg C
		Diagnosis delay time	Diagnostic runs continuously when the engine is running