It seems Renault is yet to solve all its troubles with the new turbo V6 'power unit'.
After a disastrous Jerez test for the French engine supplier and its partners - notably world champions Red Bull - Renault appeared to have taken a step forward when it emerged the new Lotus had run almost trouble-free during its more recent track debut.
But another Renault-powered car, the 2014 Toro Rosso, has been back in action even since the Lotus debut for a similar 'filming' day, allowed under the regulations for promotional purposes with non-competitive Pirelli tyres.
However, there are reports the STR9 managed only 70 kilometres at the Misano circuit in Italy, littered with "repeated" stoppages for battery and software faults.
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