(Updates after U.S. ADP jobs report)
By Jeremy Gaunt, European Investment Correspondent
LONDON, March 5 (Reuters) - Financial market focus centred on the U.S. economy's key services sector on Wednesday after a weaker-than-expected private jobs report cut into European stock gains and kept the dollar on the back foot.
Oil rose above $100 a barrel again.
Wall Street looked set for a positive start but one weighed on by a report showing that U.S. private employers cut 23,000 jobs in February, contrary to expectations of a gain.
The Institute of Supply Management's non-manufacturing index due at 1500 GMT was seen rising above its record low in January but still staying within territory that suggests economic contraction rather than expansion.
A second month of shrinkage in the index would lend considerable support to analysts who say the United States is already in recession.
Along with the ADP employers report, the data is expected to consolidate investor views about U.S. jobs data to be released on Friday, a major indicator of likely interest rate moves.
"The ADP report has given us a heads up that the jobs report on Friday could be worse than expected. All the other jobs indicators are also consistent with a softening U.S. labor market," said Shaun Osborne, chief current strategist at TD Securities in Toronto.
European shares gained, partly on the back of a report that bon insurer Ambac Financial Group <ABK.N> was moving closer to a bail out, helping shares bounce back after five consecutive days of losses.
Investors have been concerned that bond insurers are facing difficulties, stemming from the U.S. subprime mortgage crisis, which could add a whole new dimension to the global credit crisis.
The FTSEurofirst300 index <
> was up 0.8 percent, off its pre-ADP highs.Earlier, Japanese stocks ended slightly lower at a six-week closing low.
"Investors know shares are cheap but cannot bring themselves to actually buy them," said Naoteru Teraoka, general manager of investment management division at Chuo Mitsui Asset Management.
The benchmark Nikkei average <
> ended down 0.2 percent or 20.22 points at 12,972.06, the lowest close since Jan 23. The broader TOPIX index < > was down 0.1 percent at 1,263.91.OIL SPIKES, DOLLAR FIRMS
Oil prices moved above $100 after an almost 3 percent tumble on Tuesday, as growing signs that OPEC would not raise output at its latest meeting balanced expectations of bearish U.S. oil stocks data.
U.S. light crude for April <CLc1> was up $1.09 cents at $100.58 a barrel, still below Monday's record high of $103.95.
"The market, not only oil but all commodities, will remain supported," said Ken Hasegawa, manager of commodities derivatives at broker Newedge in Tokyo.
The dollar failed to hang on to early gains and was flat against a basket of six major currencies at 73.652 <.DXY>.
The euro rose about 0.1 percent to $1.5222 -- close to this week's record $1.5275 <EUR=>. The dollar was up 0.1 percent versus the yen at 103.42 yen <JPY=>.
The dollar has fallen roughly 5 percent against the yen in the past week while the euro has climbed around 3.5 percent versus the U.S. currency.
Euro zone government bond prices were lower. The benchmark 10-year bond yield <EU10YT=RR> was up 2 basis points at 3.836 percent. (Editing by Mike Peacock)