Nissan Murano: Dtc/circuit Diagnosis / U0100 Lost Communication (ecm A)

Nissan Murano (Z52) 2015-2024 Service Manual / Transmission & Driveline / Transaxle & Transmission :: Cvt: Re0f10j / Dtc/circuit Diagnosis / U0100 Lost Communication (ecm A)

DTC Description

DTC DETECTION LOGIC

When the ignition switch is ON, TCM is unable to receive the CAN communications signal from ECM continuously for 2 seconds or more.

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
U0100	LOST COMM (ECM A) (Lost Communication With ECM/PCM A)	Diagnosis condition	When the ignition switch is ON
		Signal	CAN communication signal
		Threshold	TCM is unable to receive the CAN communications signal from ECM
		Diagnosis delay time	Continuously for 2 seconds or more

POSSIBLE CAUSE

ECM
Harness or connector (CAN communication line is open or shorted)

FAIL-SAFE

Selector shock is large
Start is slow
Acceleration is slow
Lock-up is not performed

DTC Confirmation Procedure

CHECK DTC PRIORITY

WhenDTC U0100 is displayed together with DTC U0300, diagnose first the DTC U0300.

Is "U0300" detected?

YES>>

Perform diagnosis of DTC U0300. Refer to Diagnosis Procedure.

NO>>

GO TO 2.

PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE

Start the engine and wait for at least 5 seconds.
Check the DTC.

Is “U0100” detected?

YES>>

Go to Diagnosis Procedure.

NO-1>>

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

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

For the diagnosis procedure, refer to Trouble Diagnosis Flow .

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