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 Compressor Intake Temperature reading was higher or lower than other temperature sensors after 8 hours (engine off), or the sensor reading is erratic when engine running.

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1191-00	(Inlet Air Temperature Sensor Performance/Rationality)	1	Diagnosis condition	Engine running 2 minutes or more
			Signal (terminal)	(-)
			Threshold	Cumulative sum of error in 150 seconds is > 1, 500°C, which is ≥ 2°C. Where tolerance is defined as 68.5°C.
			Diagnosis delay time	Diagnostic runs continuously when the engine is running
		2	Diagnosis condition	8 hour cold soak Engine running.
			Signal (terminal)	(-)
			Threshold	Turbocharger compressor intake pressure/temperature sensor is 40°C > the tolerance of the second most accurate sensor of the remaining sensors
			Diagnosis delay time	Diagnostic runs continuously when the engine is running