A glitch the team called hydraulics Saturday interrupted Ferrari driver Felipe Massa's resumption of Formula One testing at Bahrain International Circuit at Sakhir.
Limited to 53 laps because of the problem, Massa's best lap was recorded at 1 minute, 31.174 seconds, somewhat off teammate and world champion Kimi Raikkonen's 1:30.914 set in 66 laps.
Track temperatures reached as high as 90 degrees Fahrenheit at the 3.36-mile Persian Gulf island course where scattered morning clouds gave way to full sunshine.
Ferrari continued to work on set-up of the F2008, a car team manager Luca Baldisserri told reporters successfully has shed electronic driver aids and retained traction and speed.
Toyota also resumed testing at Sakhir. Race drivers Jarno Trulli and Timo Glock worked on set-up development of the TF108 in some of the warmest conditions yet encountered in preseason testing. Toyota engineers took a close look at the car's cooling systems. The TF108 has a revised cooling scheme.
Toyota chief engineer for race and test Dieter Gass said the team accomplished its planned program of mechanical and aerodynamic set-up changes.
"It is good to see the weather continue to improve because we came to Bahrain for warm weather and now we have it," he said. "This is useful for us because not only are we sure of a full day's testing, but also because it gives us a good chance to look at the cooling on the new car, which is different to the TF107."
Trulli said testing went to plan.
"We did a lot of set-up and aerodynamic work, comparing different settings to get more information," Trulli said, after running 73 laps with a quick lap of 1:32.382. "Our target was to do as many laps as possible so we learned more about which areas we have to improve. I think we know what direction to go in and we are working hard on this. We did all the laps we planned and no more because we are limited on (testing) kilometers during the year so we have to consider this, especially as the TF108 has been quite reliable so far."
Teams are limited to 30,000 kilometers (18,641 miles) of testing exclusive of young driver training and promotional events.
Glock completed 75 laps with a quick lap of 1:32.762.
"The track was a little dusty in the morning but apart from that we have had very good conditions for testing so that helps," Glock said. "I am pretty pleased with how things have gone so far, and I feel we are making good progress."
The team also practiced pit stops in anticipation of simulating a race during Sunday's test.
Testing times are unofficial. The season begins with the Australian Grand Prix on March 16.