During data rewriting, it is common to encounter rewriting failures that prevent the process from completing. Below is an analysis of several common failure scenarios.
Current software version: 3.5.3.3
First Scenario: The progress stops unexpectedly.
Reason 1: Interference from the vehicle’s wiring or unstable connections.
Reason 2: The computer’s performance issues caused a freeze.
Solution: Disconnect the vehicle’s battery to completely power off, close any background programs on the computer, or restart the computer to retry the rewriting process.
Second Scenario: Progress does not move at all.
Reason 1: Failure in communication between the diagnostic tool and ECU, or the ECU has crashed.
Solution: Check the CAN communication; if possible, remove the ECU for jumper rewriting.
Reason 2: The interface displayed by the intelligent tool does not match the actual situation.
Solution: Verify the ECU part number and data version.
Important notes for National VI ECU data rewriting (click to view).
Reason 3: The issued data version does not match the ECU version.
Solution: Verify the ECU part number and data version.
Important notes for National VI ECU data rewriting (click to view).
Reason 4: If there are devices such as the “Sky Key”, “Smart Pass”, vehicle terminal, Internet of Vehicles, or dashcam connected to the vehicle, they may cause interference leading to rewriting failure.
Solution: Disconnect the in-vehicle terminal devices, then power off the vehicle and reconnect before attempting to rewrite again.
Phenomenon 1: An error message “Start Diag” appears during rewriting.
Phenomenon 2: If the new ECU option is checked, a permission rewriting failure will be reported.
Third Scenario: Newly purchased devices have not undergone the correct firmware upgrade; upgrading can resolve this issue.
Upgrade method for the second generation of Smart Pass: Steps for upgrading the second generation firmware (latest update).
Upgrade method for the standard version of Smart Pass: Instructions for driver installation and firmware upgrade.
Fourth Scenario: The progress reaches 100% but reports an error.
Reason 1: Issues with the data itself; special data is prone to this problem.
Reason 2: Interchanging data between WISE15C and WISE15 can cause this phenomenon.
Solution: Verify the accuracy of the data; this requires checking with the backend. You can call 15376366910 to verify the data.
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