DTC Detection Logic

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signals from ECT sensor and intake air temperature sensor.
The comparison result of signals transmitted to ECM from each temperature sensor (IAT sensor, ECT sensor, EOT sensor, and FTT sensor) shows that the voltage signal of the FTT sensor is higher/lower than that of other temperature sensors when the engine is started with its cold state.

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0181	FTT SENSOR (Fuel temperature sensor a circuit range/performance)	1	Diagnosis condition	-
			Signal (terminal)	Voltage signal transmitted from FTT sensor to ECM
			Threshold	Rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signals from ECT sensor and intake air temperature sensor
			Diagnosis delay time	-
		2	Diagnosis condition	-
			Signal (terminal)	Voltage signal transmitted from FTT sensor to ECM
			Threshold	The comparison result of signals transmitted to ECM from each temperature sensor (IAT sensor, ECT sensor, EOT sensor, and FTT sensor) shows that the voltage signal of the FTT sensor is higher/lower than that of other temperature sensors when the engine is started with its cold state
			Diagnosis delay time	-