Nissan Sentra B18 (2020-2025) Service Manual: U0073-00 Can Comm Circuit

Nissan Sentra B18 (2020-2025) Service Manual / Restraints / Srs Air Bag Control System :: Dtc/circuit Diagnosis / Air Bag (air Bag Diagnosis Sensor Unit) / U0073-00 Can Comm Circuit

Dtc Description

DTC Description

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Sentra vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Sentra vehicle is equipped with many electronic control unit, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-High line, CAN-Low line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

CAN Communication Signal Chart. Refer to CAN Communication Signal Chart.

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U0073-00	Control module comm Bus A Off (Control module communication Bus A Off)	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	CAN communication signal
		Threshold	Air bag diagnosis sensor unit cannot communicate CAN communication signal.
		Diagnosis delay time	2 seconds or more.

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

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Confirmation Procedure

Confirmation Procedure

CHECK SELF DIAGNOSTIC RESULT
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “AIR BAG”.
  3. Check for DTC.
Is malfunctioning part detected?
YES>>
Refer to DTC Diagnosis Procedure.
NO>>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO>>
Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK CAN COMMUNICATION SYSTEM
1. Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.
>>
Inspection End.

B1500-92 Door Satellite Sensor

Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen items (Tro ...

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