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
-
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:
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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.