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 ECM did not receive a message from the ABS actuator and electric unit (control unit).
The ECM did not receive a message from the A/C auto amp. (automatic air conditioner) or front air control (manual air conditioner).
The ECM did not receive a message from the air bag diagnosis sensor unit.
The ECM did not receive a message from the body control module (BCM).
The ECM did not receive a message from the combination meter.

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC Detection Condition
U1000-01	CAN COMM CIRCUIT (CAN communication circuit)	1	Diagnosis condition	When ignition switch is ON.
			Signal (terminal)	-
			Threshold	Message not received from ABS actuator and electric unit (control unit) or torque values from ABS actuator and electric unit (control unit) exceed maximum or heartbeat counter value from ABS actuator and electric unit (control unit) is not incrementing
			Diagnosis delay time	Diagnostic runs continuously when ignition switch is ON or engine is running.
		2	Diagnosis condition	When ignition switch is ON.
			Signal (terminal)	-
			Threshold	Message not received from air bag diagnosis sensor unit
			Diagnosis delay time	Diagnostic runs continuously when ignition switch is ON or engine is running.
		3	Diagnosis condition	When ignition switch is ON.
			Signal (terminal)	-
			Threshold	Message not received from body control unit (BCM)
			Diagnosis delay time	Diagnostic runs continuously when ignition switch is ON or engine is running.
		4	Diagnosis condition	When ignition switch is ON.
			Signal (terminal)	-
			Threshold	Message not received from combination meter
			Diagnosis delay time	Diagnostic runs continuously when ignition switch is ON or engine is running.
		5	Diagnosis condition	When ignition switch is ON.
			Signal (terminal)	-
			Threshold	Message not received from immobilizer
			Diagnosis delay time	Diagnostic runs continuously when ignition switch is ON or engine is running.
		6	Diagnosis condition	When ignition switch is ON.
			Signal (terminal)	-
			Threshold	Heartbeat counter value from transmission control unit (TCU) is not incrementing
			Diagnosis delay time	Diagnostic runs continuously when ignition switch is ON or engine is running.