Toyota Motor Corp <7203.T> said it could take until the end of the year before production has fully recovered to levels before the massive earthquake and tsunami on March 11 devastated Japan's northeast, disrupting the supply of key parts.

In the clearest forecast yet of how long it would take for the Japanese auto industry to recover, Toyota said output would start to pick up in July in Japan and around August overseas, with a complete recovery expected in November or December.

Until then, Toyota's domestic factories will continue to work at volumes equivalent to half of original plans, and at an average 40 percent outside Japan, the world's biggest automaker said.

With this many aftershocks, including one last night, we've seen some of the recovery work thrown back to square one many, many times, President Akio Toyoda told a hastily called news conference in Tokyo on Friday.

In that sense it's difficult to say what the impact on production volumes or earnings will be.

The news from Toyota came just hours after Japan's Renesas Electronics Corp <6723.T>, a major supplier of chips to the auto industry, said it would resume operations at a damaged factory north of Tokyo on June 15 -- a few weeks ahead of schedule -- an easing of a key bottleneck for car makers.

While Renesas -- like Toyota -- stopped short of specifying at what pace production would ramp up, investors cheered its announcement, pushing Japanese auto stocks sharply higher to reverse earlier losses.

The projection from Renesas, which has a 40 percent market share in automotive microcontroller chips globally, was a big factor in Toyota's gaining more clarity on its own production, Toyota Executive Vice President Shinichi Sasaki said.

The market was worried about clarity on how long this could last, and Toyota provided a degree of that, Deutsche Securities auto analyst Kurt Sanger said. It's positive news, he said.

Shares in Toyota ended up 3.1 percent, while Nissan Motor Co <7201.T> put on 3.6 percent and Honda Motor Co <7267.T> gained 2.3 percent.

Some said Toyota's forecast could prove conservative in light of recent signs of factories starting to come back on line, a fund manager said.

According to what we're hearing directly from companies, it looks like the recovery on the ground is faster than people think, and Toyota may well restart production even faster than they stated in this announcement, said Tetsuro Ii, chief executive officer of Commons Asset Management.

RETHINKING PARTS PROCUREMENT

Japanese automakers have slashed production due to the shortage mostly of electronic and resin-based parts from the magnitude-9.0 earthquake and the resulting tsunami and damage to a major nuclear plant that has disrupted power supply.

By the end of this month, Toyota said it will have produced 500,000 fewer vehicles globally than it had initially planned, with 400,000 units of that in Japan.

President Toyoda said Toyota did not yet know which car models would be built at what levels in the ramp-up toward the end of the year.

But he said that giving even a rough sense of timing would be a help to dealers, who he said could now give customers at least a vague sense of when they could expect cars to be delivered.

The disruption of parts supply in Japan has also affected car makers overseas such as General Motors Co and Ford Motor Co , underscoring the complexity, depth and breadth of the industry's supply chain and the flip side of its lean just-in-time manufacturing system when a part goes missing.

While concentrating production of certain electronic parts was inevitable for suppliers to compete on the global stage, Toyota's Sasaki said addressing the risk of supply disruption was a task for industry as a whole in one of the world's most earthquake-prone countries.

Even among the components that Toyota buys locally in overseas regions, there were secondary parts that originated in Japan, Sasaki said, causing a bottleneck at less visible levels.

In light of that, we want to consider encouraging our suppliers to set up more production sites overseas, he said.

For its part, Toyota's manufacturing chief, Executive Vice President Atsushi Niimi, said the automaker remained committed to building at least 3.0-3.2 million vehicles a year in Japan in an effort to keep the tradition of monozukuri, or manufacturing, strong in the country.

(Additional reporting by Antoni Slodkowski; Editing by Edmund Klamann and Edwina Gibbs)

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