FIA said it is looking into incidents involving the Mercedes-powered team 'in light of a possible breach of the International Sporting Code'.
The MP4-18 made its first track appearance this week at the Le Castellet circuit in southern France with Austrian Alexander Wurz at the wheel.
Although Schumacher won Sunday's Austrian GP for his third win in a row this season, McLaren's Raikkonen is still two points ahead of the Fereari ace.
No financial details were given. Briton Hamilton, 23, was championship runner-up in his rookie season last year with four wins for the Mercedes-powered team.
Lewis Hamilton feels McLaren want him to win the Formula One title more than team mate Fernando Alonso.
Ferrari got on the podium with Brazilian Felipe Massa taking the third spot.
Seam bowler Ryan McLaren took five for 19 to lead South Africa to a 13-run win over West Indies in their Twenty20 international at the Sir Vivian Richards stadium on Wednesday.
The McLarens of Britons Jenson Button and Lewis Hamilton posted the fastest times as Formula One got back to business with the first two practice sessions for the season-opening Australian Grand Prix on Friday.
The Formula One gossip factory is in full swing over the future of Lotus driver Kimi Raikkonen. And McLaren are not doing any more to stop the rumour mills surrounding the Finnish driver's next move.
Formula One world champion Jenson Button will start next season with a more aggressively designed McLaren than the one Lewis Hamilton struggled with for much of this year.
The Colombian will not be allowed to compete in NASCAR until his McLaren contract ends, team boss Ron Dennis said.
However, McLaren's David Coulthard warned Button not to be under any illusions.
The Brawn GP owner, whose team tops both the drivers' and constructors' standings with two wins from two races, told reporters at the Malaysian Grand Prix that his rivals' difficulties were a direct result of last year's title battle.
Formula One world champion Lewis Hamilton kept McLaren on top for a third straight practice session at the Hungarian Grand Prix Saturday.
A widely-circulated anonymous email put fresh focus on recent allegations of misconduct toward a female colleague.
"The reality check is a race weekend so there is nowhere to hide from that," said the Scot.
Honda will return to Formula One in 2015 as McLaren engine partners, replacing Mercedes, sources close to the company said on Wednesday.
Verstappen's hopes of a record-extending 11th successive victory looked a long shot on a city circuit where overtaking is never easy.
New McLaren driver Sergio Perez set the fastest lap on the second day of Formula One testing at Barcelona's Circuit de Catalunya on Wednesday.
Formula One driver Jenson Button had reportedly signed a deal with McLaren for one more year, months ago, and the announcement is set to be made soon.
McLaren boss Ron Dennis said on Tuesday he had decided to stay at the helm of the Formula One team, ending media speculation that he was about to stand down.
Charles Leclerc swept to pole position for the Mexico City Formula One Grand Prix on Saturday with Carlos Sainz qualifying second in a surprise Ferrari front-row lockout.
Formula One championship leader Lewis Hamilton says he would have even driven for free for the team this year.
World champion Jenson Button calmly steered his way through the chaos of a wet Chinese Grand Prix for his second win of the season on Sunday, leading Lewis Hamilton to a McLaren one-two.
Ferrari and McLaren take battle off the track with their new super cars.
Formula One served up a thriller in China at the weekend but the lack of fans indicated the sport must do more to sell itself to new audiences, according to McLaren boss Martin Whitmarsh.
The victory at Suzuka was the Dutch driver's 13th in 16 races this season and left him on the brink of a third world title.
Force India Formula One team boss Vijay Mallya feels beating McLaren for fifth spot in the team standings will be a 'big task' in the remaining four races of the season.
Carlos Sainz lapped Monza's "Temple of Speed" with a fastest time of one minute 20.294 seconds, 0.013 quicker than Max Verstappen's final flying lap.
Max Verstappen took his fifth pole position in a row at the British Grand Prix.
Felipe Massa was leading the 2008 Singapore Grand Prix when fellow-Brazilian Nelson Piquet Jr. deliberately crashed his Renault into the wall on lap 14.
Force India's Paul di Resta's race ended prematurely due to a collision while Adrian Sutil finished ninth in the Belgian Grand Prix as Sahara Force India lost its fifth place to McLaren in Spa on Sunday.
Max Verstappen celebrated a record 10th win in a row by leading Red Bull team mate Sergio Perez one-two at Ferrari's home Italian Grand Prix
Red Bull's triple World champion Max Verstappen wrapped up a year of unprecedented dominance with his record-extending 19th win in 22 races at the season-ending Abu Dhabi Grand Prix on Sunday.
Max Verstappen put Red Bull on pole position for his home Dutch Grand Prix at Zandvoort for the third year in a row
