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Diagnosing "Failed to Unlock ECU"


Woolich Racing provides hardware and software to allow users to write tune files to their ECUs, thereby modifying the vehicle performance.  This requires that we can communicate with the ECU using our Woolich Racing Tuned software.  This works very well for all stock ECUs of all supported part numbers (see the Products page for details on supported part numbers) however sometimes ECUs have been modified already from the original factory settings so are no longer 'stock' ECUs.  This can result in an error when trying to write to the ECU with the message "Failed to Unlock ECU".

It is possible that ECUs that have been written to by another third-party software (ie. non-Woolich Racing software) and that these ECUs can be locked to other software.  This is common with many Denso models, and means that the WRT software is unable to write to the ECU.

This happens when the other software product changes the 'key' used to unlock the ECU, so that it can be read or written to.  If it has been locked, the Woolich Racing Tuned software will give an error message saying 'Failed to Unlock ECU'.

Unfortunately in most cases there is no way around this, and usually the ECU will need to go back to the previous tuner, to have that software/code removed from the ECU, and returned to 100% factory stock, before it can be written to using Woolich Racing Tuned. For a few select models we do have an 'Unlock ECU' feature that if available, you may try using to unlock the key in the ECU, but this may take some time to complete. 


In some cases the other software will not be able to return it to stock, because it does not support that option, and they can only rewrite to it with a new bin file. This will not remove the lock, and a replacement ECU may be required to flash it with Woolich Racing Tuned.

The Woolich Racing Tuned software supports going back to 100% stock, but it can not remove another software's lock.




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