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Toyota recall: Three questions left unanswered

Toyota says a brief shift in its computerized braking system caused consumer concern. But consumer complaints show a potentially deeper problem.

By Correspondent / February 12, 2010

A file picture taken on February 5, 2010 shows the flank of the latest Toyota Prius hybrid vehicle at the company's showroom in Tokyo. Embraced by Hollywood celebrities and beloved by environmentalists, the Prius has long been the envy of Toyota's rivals

Kazuhiro Nogi/AFP/Newscom

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Toyota's three-part recall could bring as many as 8 million vehicles into dealerships around the world. From slipping floor mats to sticky accelerator pedals to a fraction of a second's difference in the Prius' braking system, each of Toyota's three recalls had a theme: Drivers were losing control of their surging?? vehicles.

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After several public mea culpas by the company's CEO and the president of Toyota (USA) taking questions live on Digg, the company is moving quickly to reassure drivers that it has covered all the bases. But three questions remain unanswered.

1. Will the Prius fix work?

Toyota says customer concerns stem from when drivers try to brake on a bumpy, slick, or otherwise rough surface, the car's skid control can engage and delay the braking system for 0.46 seconds. The software update will reduce the time of the delay to 0.4 seconds, the time delay on previous generations of the Prius, a Toyota spokesman told the Monitor.

Toyota says only the 2010 Prius uses the new braking software. Separately, the company has recalled 2004-09 Priuses because floor mats can jam the accelerator.

However, as far back as 2005 numerous owners of these older Priuses have complained to the National Highway Traffic Safety Administration that when braking on rough surfaces, their cars actually surge forward.

One possibility is that the sensation of a "surging" vehicle occurs when a driver expects the car to continue slowing but instead maintains its previous speed.

"My wife was coasting to [a] stop (around 5 MPH) for a stop sign and when she put her foot on the brake the car started to accelerate. She came to a stop after hitting another car head one," one complaint reads.

Another consumer experienced a surging Prius as a regular occurrence.

"Ever since I've owned my 2005 Prius, I have experienced unintended acceleration on a regular basis. It most often happens on a particular street in my neighborhood where I need to stop before entering a main thoroughfare," the driver writes. At the intersection, the road declines slightly and "just at the point where I begin to brake, the car suddenly lunges forward."

2. Is the problem limited to Priuses?

When Toyota announced the 2010 Prius recall Feb. 9, it also recalled the 2010 Lexus HS 250h, which uses an antilock braking system similar to the Prius.

But complaints of surging over bumpy terrain extend to other Toyotas in earlier model years.

"The braking issues that were described in the [Monitor article on consumer complaints] are EXACTLY what I've experienced on multiple occasions with my 2005 Lexus ES330. When it has happened to me in the past, I've thanked my lucky stars that there weren't any people, cars, trees, whatever in front of me," wrote Michael Herger of Marrieta, Ga. in an e-mail. "Because it typically happens on bumpy surfaces and wet surfaces coming to a stop, I've made a terrible assumption that the car is somehow responding correctly."

Toyota has offered explanations for its three-part recall but has yet to address several pressing issues. How do you think Toyota has handled the recall? Let us know in the comments below or on Twitter.

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