Another hot and sunny day enabled Frentzen to achieve the fourth fastest lap time of 1m14.13s and run a total of 99 laps, despite several red flags, as he concentrated on a race simulation. He did, however, have a reoccurance of the overheating problems that have plagued the car since its launch.

Setting the second quickest lap time of 1m14.04s, Trulli furthered chassis set-up work and the tyre evaluation programme, with a race simulation planned for tomorrow.

"I'm trying to work on the set-up," said Trulli, "and we're having no problems with the reliability, but I just don't know how fast the car is capable of going."

Heinz and Jarno will be back on the Spanish track on Wednesday for the final day's testing with chassis set-up development work.