(Fixed) VVDI MB V5.0.3 Renew ECU Error “connecting to unit…failed”

Used VVDI MB V5.0.3 for renew ECU successfully before, but today get error “connecting to unit…failed”. What’s the matter?


Xhorse Engineer solution:

Please take a picture of VVDI MB software error; and a picture of the engine number.


Here you can see the error images:

vvdi-mb-v5-0-3-renew-ecu-error-solution-01 vvdi-mb-v5-0-3-renew-ecu-error-solution-02


After seeing the above images, engineer share the correct wiring diagram to follow:



Let us look forward to the good news of this user.


Good luck to him.