Nissan Murano: Dtc/circuit Diagnosis / U0101 Can Comm Circuit

Nissan Murano (Z52) 2015-2024 Service Manual / Engine / Engine Control System :: Vq35de / Dtc/circuit Diagnosis / U0101 Can Comm Circuit

DTC Description

DESCRIPTION

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-Nissan Murano vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a Nissan Murano vehicle, 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 H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

DTC DETECTION LOGIC

When ECM is not transmitting or receiving CAN communication signal of OBD (emission-related diagnosis) with TCM for 2 seconds or more.

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
U0101	LOST COMM (TCM) (Lost Communication with TCM)	Diagnosis condition	Ignition switch ON
		Signal (terminal)	CAN communication signal
		Threshold	ECM is not transmitting or receiving CAN communication signal of OBD (emission-related diagnosis) with TCM.
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication line between TCM and ECM
CAN communication line open or shorted

FAIL-SAFE

Engine operating condition in fail-safe mode
Fail safe mode		Nissan Murano Vehicle behavior
CAN communication line		ECM operates active grille shutter to fully-open position.

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON and wait at least 3 seconds.
Check DTC.

Is DTC detected?

YES>>

Proceed to Diagnosis Procedure.

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

Perform the trouble diagnosis for CAN communication system. Refer to Trouble Diagnosis Flow .

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