Daniil Kvyat of Russia and Scuderia Toro Rosso stops out on track during day four of Formula One Winter Testing at the Circuito de Jerez on Jan 31, 2014. (Photo: Getty Images)

Daniil Kvyat of Russia and Scuderia stops out on track during day four of Formula One Winter Testing at the Circuito de Jerez on Jan 31, 2014. (Photo: Getty Images)

It seems 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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