Formula One: McLaren probe finds no problems with Alonso's car

The British team said it worked "very transparently" with world body FIA. Some observers have raised questions about the crash, with Alonso's manager labelling it "very strange".

"Technically we have conducted all the investigations on the car and very transparently with the FIA," said racing director Eric Boullier.

"Everything we have conducted so far we couldn't find anything wrong or which has implied the (reason for the) accident.

"So we are still looking for further investigations but we have given our report to the FIA and we are working with the FIA so nothing more can be said than this."

McLaren's Jenson Button earlier said he pored over the data from Alonso's accident last month. McLaren has denied speculation he suffered an electric shock in the cockpit.

Alonso, a two-time world champion, hit the inside of Turn 3 at Barcelona and suffered concussion and temporary memory loss. He is skipping Melbourne on medical advice.

Boullier said Alonso, who cannot risk a second head impact so soon after the first, was on track for the second race in Malaysia as he begins his second stint with McLaren.

"The normal process recommended by the doctor was for him to stay and rest at home for a few days so this is what he is doing," Boullier said.

"He has to start and train again with his recovery and training programme. Now it's up to the doctors and the FIA to decide if he will be ready to race in Malaysia or not."

The Alonso controversy has raised pressure on a team that limped through pre-season testing, with the MP4-30 clocking only 30 laps in the final session -- the least of any team.

The McLaren drivers, Jenson Button and Kevin Magnussen, had more problems in Friday testing.

Three-time race winner Button reported understeer problems while Magnussen, deputising for Alonso, came off into the gravel at Turn 6 and retired during the second session.