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 EGR temperature reading was too high or too low for the operating conditions, or the EGR temperature reading did not raise 0.5 degree Celsius at start-up.

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P040B-00	(EGR temperature sensor "A" circuit range/performance)	1	Diagnosis condition	Engine running for 2 minutes or more (2 Trips).
			Signal (terminal)	Exhaust gas temperature (-)
			Threshold	Cumulative sum of error in 60 seconds is > 6, 000 Deg C.
			Diagnosis delay time	Diagnostic runs continuously when the engine is running
		2	Diagnosis condition	Engine running for 2 minutes or more (2 Trips).
			Signal (terminal)	Exhaust gas temperature (-)
			Threshold	Maximum sensor value to minimum sensor value after 60 seconds is < 0.3° C.
			Diagnosis delay time	Diagnostic runs continuously when the engine is running
		3	Diagnosis condition	Engine off time is 480 minutes or more. The temperature drop detected on coolant temperature sensor is 1°C or less for 30 seconds after the engine is started up.
			Signal (terminal)	Exhaust gas temperature (-)
			Threshold	> 25 deg C of the second most accurate of the remaining temperature sensors
			Diagnosis delay time	Diagnostic runs continuously when the engine is running