Nissan Murano: Dtc/circuit Diagnosis / U0073 Communication Bus a Off
DTC DETECTION LOGIC
TCM communication blockage lasts for 2 seconds or more when turning ON the ignition switch. (Communication not established.)
| DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition | |
| U0073 |
COMM BUS A OFF (Control Module Communication Bus A Off) |
Diagnosis condition | When turning ON the ignition switch |
| Signal | CAN communication | ||
| Threshold | TCM communication blockage (Communication not established) | ||
| Diagnosis delay time | Last for 2 seconds or more | ||
POSSIBLE CAUSE
Harness or connector (CAN communication line is error)
FAIL-SAFE
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Selector shock is large
-
Start is slow
-
Acceleration is slow
-
Lock-up is not performed
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 2.
PERFORM DTC CONFIRMATION PROCEDURE
-
Start the engine and wait for at least 5 seconds.
-
Check the DTC.
Is “U0073” 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
For the diagnosis procedure, refer to Trouble Diagnosis Flow .
U0100 Lost Communication (ecm A)
DTC Description
DTC DETECTION LOGICWhen the ignition switch is ON, TCM is unable to receive the CAN communications signal from ECM continuously for 2 seconds or more...
Other information:
Nissan Murano (Z52) 2015-2024 Service Manual: Hill Start Assist Function
System Description SYSTEM DIAGRAM This function maintains brake fluid pressure so that the vehicle does not move backward even if brake pedal is released to depress accelerator pedal to start the Nissan Murano vehicle while it is stopped on an uphill slope by depressing brake pedal...
Nissan Murano (Z52) 2015-2024 Service Manual: Normal Operating Condition
Description Symptom Result Brake pedal slightly vibrates and operation sound (motor sound and sound from suspension) occurs when VDC function, TCS function, ABS function, EBD function, brake assist function, hill start assist function operates. This is not a malfunction, because it is caused by VDC function, TCS function, ABS function, EBD function, brake assist function, hill start assist function that are normally operated...
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Autolight system
The autolight system allows the headlights to turn on and off automatically. The autolight system can:
Turn on the headlights, front parking, tail, license plate and instrument panel lights automatically when it is dark. Turn off all the lights (except daylight running lights) when it is light. Keep all the lights on for a period of time after you place the ignition switch in the OFF position and all doors are closed.