The FIA has cleared Toro Rosso and Renault of any wrongdoing over an indoor Formula 1 engine test at the Austrian AVL facility earlier this year, AUTOSPORT has learned.
Motor racing's governing body was recently forced to react to allegations from an anonymous source that Toro Rosso and Renault may have broken F1's testing restrictions by running on a rolling road with windtunnel capabilities for six days before the start of the season.
It asked Toro Rosso and Renault for details about the test and to confirm that the dyno use was fully in compliance with both testing regulations and tyre rules that prevent cars running on current rubber.
Following discussions between the FIA and the team and engine manufacturer, it has been confirmed that the test was fully in compliance with the rules and the matter is now closed.
Renault said at the time the allegations were made that it did not understand why there would be any suggestion it had done anything wrong.
Its head of trackside operations Remi Taffin said: "As far as we were concerned, it was to support Toro Rosso and try to get one more way to close the [performance] gap that we had at that point.
"Any dynos that would be available we could use - so we took the opportunity. It was just trying to get more dynos than what we had in Viry."