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updated 4/16/2010 7:35:01 PM ET 2010-04-16T23:35:01

Toyota Motor Corp. said Friday it was recalling 600,000 Sienna minivans sold in the United States to address potential rusting spare tire cables that could break and create a road hazard in the latest safety problem to strike the beleaguered automaker.

The recall came as House investigators said they planned to hold another congressional hearing in May to review potential electronic problems in runaway Toyotas. The Japanese automaker has recalled more than 8 million vehicles because of faulty accelerator pedals, humbling a car company long known for its quality and safety.

Company leaders vowed to respond quickly to the safety concerns.

Toyota said its latest recall covered the 1998-2010 model year Siennas with two-wheel-drive that have been sold or registered in 20 cold-climate states and the District of Columbia. Toyota said rust from road salt could cause the carrier cable that holds the spare tire to rust and break, allowing the tire to tumble into the road. The problem could threaten the safety of other drivers.

Toyota said it was unaware of any accidents or injuries. The National Highway Traffic Safety Administration said it had received six complaints of spare tires falling off Siennas.

The company said it was working on a fix for the problem. In the meantime, customers will receive a notice telling them to bring their vehicle to a dealership for an inspection.

The recall involves Siennas in the District of Columbia and the following states: Connecticut, Delaware, Illinois, Indiana, Kentucky, Massachusetts, Maryland, Maine, Michigan, Minnesota, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Virginia, Vermont, Wisconsin and West Virginia.

"Toyota is listening to its customers attentively, and we want to make sure their voices are heard," said Steve St. Angelo, Toyota's chief quality officer for North America.

St. Angelo said the company was providing free inspections of the spare tire carrier cable across the nation, including states not included in the recall.

Lawmakers remain focused on the spate of recalls affecting the company. Rep. Henry Waxman, chairman of the House Energy and Commerce Committee, and Rep. Bart Stupak, a subcommittee chairman, said they plan to hold a May 6 hearing to look into potential electronic causes of sudden acceleration in Toyota vehicles.

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Toyota has said it has found no evidence of electronic problems, attributing the issues to sticking gas pedals and accelerators that can become jammed in floor mats.

Toyota said in a statement Friday it was "more than willing to meet with the committee and discuss the ongoing testing related to our electronic throttle control system, as well as the steps we are taking to improve our quality assurance processes. Nothing is more important to us than the safety and reliability of the vehicles our customers drive."

The Transportation Department has fined the company $16.4 million for failing to promptly notify the government about defective gas pedals among its vehicles. Toyota has until Monday to agree to the penalty or contest it. The fine is the largest civil penalty ever issued to an automaker by the government.

Transportation officials have not ruled out additional fines. The department is reviewing whether Toyota delayed for six weeks the late January recall of the 2009-2010 Venza in the United States to address floor mats that could entrap the accelerator pedal after making a similar recall in Canada.

Toyota recalled the Venza in Canada in December and reported to the U.S. government on Dec. 16 that the floor mats could move forward while the vehicle is in use and "may interfere with the accelerator pedal." Toyota told U.S. authorities at the time that the floor mats in question were not imported into the U.S. but the Venza was added to the floor mat recall in late January.

Automakers are required to notify the U.S. government within five business days when they find a potential safety defect.

Waxman and Stupak, meanwhile, have asked Toyota and outside consulting firm Exponent Inc. to provide documents detailing a review of possible electronic problems in its vehicles. Exponent, which was hired by Toyota, said in an interim report it could find no evidence that electronic malfunctions had caused sudden unintended acceleration.

Committee investigators said in February that the Exponent testing was flawed because it studied only a small number of Toyota vehicles and consumer groups have said electronics could be the cause of the acceleration problems. Reviews of some high-profile crashes in San Diego and suburban New York have failed to find either mechanical or electronic problems.

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