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Button said in a team release: "We expected this test to be tricky - and the next two days probably won't be plain sailing, either - but people have short memories. Look at last northern winter; the first test of 2014 was very tough for everyone too.""So there are no real worries at the moment. We're just hopeful we've solved our issue.
"The last run of the day seems to have sorted the problem so I hope Tuesday (Feb 3) will be a little easier."
After sensor problems limited team mate Fernando Alonso to six laps on the first day of pre-season testing at Jerez on Sunday (Feb 1 2015), Button managed only the same number.
The team, starting a new era with its Japanese partner Honda returning to the sport after a six-year absence, had worked overnight to fix Sunday's problems but a new one emerged when the was backon the track.
Button carried out a number of installation laps but the engineers then decided to investigate more deeply and believe they had found the cause.
TRICKY DAY
Button did one more trouble-free lap before the day's session ended.
Honda's motorsport head Yasuhisa Arai said: "Monday was another tricky day but we feel we've overcome the main issue that affected our running during the first two days of the test. Despite our lack of mileage, it's been an important learning process for our engineers, who've really started to develop a close working relationship with everybody at McLaren - that's a big positive.
"For Tuesday, we hope we've moved on, that we can get some more laps completed."
Red Bull also struggled in 2014 when the new V6 turbo/hybrid power unit was introduced but went on to finish second in the Australian opener, before disqualification. The team ended the season with three wins.Stay with Wheels24 for the 2015 F1 season – fresh reports every day.