* Bernanke reiterates loose US policy
* Tokyo shares dip, Toyota rallies but Denso weighs
* Dollar rebounds; euro hits one-year low against yen
By Vidya Ranganathan
SINGAPORE, Feb 25 (Reuters) - A tepid rally in Asian shares faltered early on Thursday and the dollar rose after Fed Chairman Ben Bernanke's reaffirmation of an extended period of low U.S. rates boosted risk-seeking but also raised some concerns about global growth.
Japan's Nikkei average rose initially, helped by exporters such as Canon Inc <7751.T> and as Toyota Motor Corp <7203.T> <TM.N> reversed most of the losses of the past two days after its chief apologised to consumers and pledged reforms to sceptical lawmakers at U.S. Congressional hearings. Toyota's U.S.-listed shares jumped 3.9 percent. [
] [ ]But a more than 2 percent slide in Denso Corp <6902.T> weighed on the broader Tokyo market after authorities said the FBI has raided three Detroit-area Japanese auto parts makers for a sealed federal antitrust investigation, including Toyota suppliers Denso and Tokai Rika <6995.T> [
]"The market welcomed a rebound in U.S. stocks after news that the country will continue its low rate policy," said Yutaka Miura, a senior technical analyst at Mizuho Securities.
"But we've seen a series of worse-than-expected economic data from America lately and uncertainty about the outlook for the U.S. economy is increasing."
The MSCI Asia ex-Japan index <.MIAPJ0000PUS> fell 0.43 percent, and sectors that fell the most were industrials and technology. The Nikkei was down 0.2 percent at 10179.79
A report on U.S. new home sales on Wednesday highlighted the Fed's predicament. Sales slumped more than 11 percent to a record low, suggesting the sector at the epicentre of the financial crisis had yet to fully heal. [
]Bernanke's assessment of the economy was also grim, further curbing the speculation of quicker policy tightening that had been spurred by last week's raising of the discount rate.
He also said a weak job market and tame inflation warrant low interest rates for "an extended period", making clear policy tightening is some time away and boosting the Dow Jones Industrial average <
> by 0.89 percent. [ ]DOLLAR RECOVERS
The dollar <.DXY> fell initially in Asia but the trade-weighted index soon recovered to 80.96, reaching for Monday's highs.
Gold <XAU=> was at $1,096 an ounce, far from Wednesday's high of 1,107.95 and down 3 percent from Monday's peak above 1,130.
Oil prices <CLc1> also hovered just above the $80 mark but were also off Wednesday's highs at $80.45, a level hit when stock markets rallied on the back of Bernanke's remarks despite a bearish report showing a build up in U.S. crude stockpiles.
The euro <EUR=> stayed weak at $1.3483, paring further the gains it had made soon after Bernanke's remarks and heading closer to a nine-month low of $1.3442 struck last week.
Worries about a possible downgrade of Greece weighed on the European single currency, pushing it down from above $1.36 on Wednesday.
Standard and Poor's said it may cut Greece's BBB+ rating by one or two notches within a month, citing downside risks to growth that could hinder the country's deficit-cutting plans. [
]"The Greek situation remains fluid. So acrimonious discussions between Athens and Brussels could easily result in further near term euro slippage," Citi said in a note.
But Citi also said that with euro net short positions at a record high, any positive news from Greece in the coming weeks could lead to a bounce in the single currency.
The euro has lost over 10 percent since late November as fiscal woes in Greece intensified in the past few months leading to a huge sell-off by investors.
The currency hit its lowest level in a year against the yen <EURJPY=R>, hitting 120.62 yen on trading platform EBS, as hedge funds liquidated positions in yen crosses. (Additional reporting by Aiko Hayashi in TOKYO, Anirban Nag in SYDNEY, Kaori Kaneko in Tokyo; Editing by Kazunori Takada)