* Asian shares gain in start to new quarter after March rally
* Auto makers up on hopes for 'controlled' bankruptcy at GM
* Euro falls; focus on ECB, G20
* NZ dollar tumbles after central bank says wants low rates (Repeats to more subscribers without changes in text)
By Rafael Nam
HONG KONG, April 1 (Reuters) - Japan's Nikkei surged 3 percent but other Asian stocks started the quarter more cautiously as reports of an orderly bankruptcy for General Motors supported sentiment.
Still, investors are worried about the broader economic impact if General Motors Corp <GM.N> and Chrysler, another struggling auto maker, go under after the U.S. administration this week rejected their turnaround plans and set new conditions for a rescue.
"If things are decided for U.S. automakers relatively quickly, this will remove one bad factor for the market," said Yutaka Miura, senior technical analyst at Shinko Securities in Japan.
European shares opened around 1 percent lower and S&P 500 futures <SPc1> were down about half a percent ahead of a G20 summit that aims to tackle the global financial crisis.
The euro fell ahead of a European Central Bank meeting later on Thursday that is widely expected to agree to cut rates, leaving investors to focus on any hints it might give on whether it will look beyond interest rates to unconventional methods fight the crisis.
In Asia, the MSCI index of Asia-Pacific stocks outside Japan <.MIAPJ0000PUS> pared earlier gains of as much as 1.4 percent but was up 0.6 percent. It rose 14.6 percent in March.
Japan's Nikkei average <
> rose 3 percent, led by a rally in car makers such as Toyota Motor Corp <7203.T> that sparked a 5.3 percent rally in the autos subindex <.ITEQP.T>Other Asia auto makers, including South Korea's Hyundai Motor <005380.KS>, also rose. Hyundai was up 4.7 percent.
GM warned on Tuesday there was a rising chance it could file for bankruptcy by June, as Fiat SpA <FIA.MI> and Chrysler LLC executives met in a race to complete a tie-up the U.S. government says Chrysler needs to survive.
News agency Bloomberg reported that the Obama administration was looking at a prepackaged bankruptcy for GM, while The New York Times said the U.S. White House was looking to ease the top U.S. auto maker into a "controlled" bankruptcy. [
]Some analysts have warned that the collapse of such big automakers will reverberate beyond North America given the network of global supplies chains.
Data on Wednesday showed Japanese business confidence tumbled to a record low, while reports on Tuesday showed plunging U.S. home prices and consumer confidence holding at just above record lows. [
] and [ ]Still, deep interest rate cuts by major central banks and stimulus measures are at least comforting stock markets in Asia.
"The market environment has turned fairly positive. Easier monetary policy worldwide has allowed more liquidity to flow into markets," said Kwak Joong-bo, a market analyst at Hana Daetoo Securities in Seoul.
Indexes in South Korea <
> surged 2.3 percent as data showing a 21.2 percent drop in exports in March from a year earlier offered tentative signs that the global demand slump may be bottoming out.Shares in Taiwan <
> rose 2 percent, while markets in Australia < > and Hong Kong < > posted modest falls.ECB TO MEET
Currency investors have remained cautious. U.S., British and Japanese central banks have turned to unconventional steps to pump funds into their economies, including outright buying of government and corporate debt.
It is not clear whether the European Central Bank will follow suit, though analysts do widely expect it to cut its main interest rate by 50 basis points to a record low of 1 percent at its policy meeting on Thursday.
The euro was down 0.4 percent from late New York trade the previous day to $1.3193 <EUR=> and shed 0.7 percent to 130.29 yen <EURJPY=>.
The dollar index, a gauge of the currency's performance against six major currencies, rose 0.4 percent to 85.850 <.DXY>, but was off an earlier high of 85.940.
Among the big decliners, the New Zealand dollar <NZD=> fell more than 2 percent and its debt rallied strongly following a central bank warning on high market rates and its reiteration that it will keep benchmark interest rates low for some time.
The central bank's verbal intervention followed a sharp tightening of monetary conditions in recent weeks, reflected by rising bond yields, swap rates and a rising kiwi dollar.
The NZ dollar <NZD=D2> fell to a low of $0.5558, from $0.5700 before the central bank statement.
In commodity markets, U.S. crude for May delivery <CLc1> slid $1.04 to $48.62 on a report from the American Petroleum Institute showing U.S. crude stocks rose by a greater-than-expected 3.3 million barrels in the week to March 27. [
]Gold <XAU=> held steady at $917.70 an ounce from its New York's notional close of $917.15 on Tuesday.