Renault are confident that the engine problems Red Bull have experienced in Jerez will be resolved by the next test in Bahrain.
Having managed just 14 laps in three days, reigning World Champions Red Bull Racing have found themselves on the back foot in pre-season testing.
Blighted by several issues, some belonging to the team and others to engine supplier Renault, technical director Adrian Newey has reportedly left Jerez to go back to the drawing board.
And while he is doing what he can to find a solution, Renault will be resolving their own issues.
"We are extremely confident that the problems we have experienced can be dealt with," engine chief Rob White told Autosport.
"We don't have a single minor problem or indeed a big howler that is causing the trouble.
"Instead, we have made significant progress and expect, with the understanding we now have, the workaround we have put in place, and with more confirmation work on the dyno overnight, to be able to run tomorrow.
"It will perhaps be in a fashion that most resembles what we would have expected to start the first day with. And if we can do that, then it shouldn't be too shabby."
White also downplayed concerns that time is running out, adamant that Renault will be ready for Bahrain.
"Looking forward to Bahrain and beyond, the aim is to make best use of the time available and to get ready for then.
"We had objectives for the first test that won't have been fully realised and therefore the step up we need for Bahrain is absolutely bigger.
"But we are determined and committed to get there and we will work with the teams to fix the problem."