Nico Hulkenberg got his first run in the VJM04, completing 31 laps as he conducted aero testing, KERS and tyre evaluation.
Paul di Resta took over in the afternoon to continue the team''s programme, putting in 38 laps with a best of 1:26.039, the sixth quickest of the day. Paul will remain in the car all day tomorrow.
"It was my first time running the KERS system as we didn't run it last time in Barcelona, and all went well with that. Using the DRS [drag reduction system] and deploying KERS together takes some time to get used to but with time it will become a lot more natural," Paul di Resta said.
"We also used the hard and soft tyre compounds from Pirelli and are understanding their behaviour a lot more. I'm looking forward to building on this programme tomorrow when I'll be in the car all day," he added.
Nico Hulkenberg was also happy to be back in a Formula car after a month''s gap and said things are moving in the right direction.
"It was good to be back in a Formula 1 car as the last time I drove was about a month ago in Valencia. It was also my first outing in the VJM04 so there were quite a lot of new systems to get used to, such as the KERS and moveable rear wing. There''s definitely a lot more work for the driver to do on the steering wheel and quite a lot of information to take in and get to grips with.
"We ultimately finished a little early with a reliability item just before the lunchtime break, but although we are still learning about the new systems, I can see we''re heading in the right direction for the first part of the year."