Safety chief defends probe of Toyota acceleration

Jul 27, 2012 by TOM KRISHER

(AP) — The government's top auto safety official is denying a U.S. senator's claim that his agency failed to thoroughly investigate unintended acceleration problems in Toyota cars and trucks.

Republican Sen. Charles Grassley sent a letter to the National Highway Traffic Safety Administration earlier this month saying that key questions remain about whether electronic glitches caused Toyota vehicles to accelerate on their own. He questioned whether NHTSA has enough expertise in electronics and why the agency called in NASA scientists help investigate.

NHTSA chief David Strickland, in a letter released on Friday, told Grassley that his agency has enough expertise to handle investigations, and that NASA was called in to take a second look. Scientists from the space agency also couldn't find any electronic causes of Toyota's runaway acceleration problems. The government concluded in February of 2011 that driver error, sticky gas pedals and floor mats trapping accelerators caused the problems.

Starting in 2009, Toyota was plagued by numerous complaints that its cars accelerated on their own, causing crashes, injuries and even deaths. The company eventually recalled more than 14 million vehicles worldwide to fix problems with gas pedals and floor mats. The recalls tarnished the company's reputation for reliability and cut into sales. Only recently has Toyota shown signs of recovering.

Grassley, of Iowa, also questioned whether a phenomenon called "tin whiskers" inside the gas pedal assembly or other electronics could have caused Toyota's problems, citing information sent to his office by unidentified whistleblowers. The microscopic whiskers can sprout from solder on electronic devices, causing electrical shorts and glitches.

In most vehicles today, electronic throttle controls have replaced mechanical cables.

Grassley told NHTSA in his July 12 letter that information from the whistleblowers "raises concerns that the scope of the NHTSA and NASA investigations may have been too narrow."

But Strickland wrote that NHTSA and NASA both explored "tin whiskers" in detail and found that it would take several electrical shorts to make the Toyota throttle controls open wide enough to cause unintended acceleration. The agencies found that multiple shorts did not occur while consumers used the vehicles, Strickland wrote.

The agency found a small number of cases in which "tin whiskers" might cause a small throttle opening, but not enough to cause unintended acceleration, he wrote. "This 'jumpy' throttle condition ceases immediately as soon as the driver releases the accelerator pedal," Strickland wrote.

"NHTSA is not aware of any UA (unintended acceleration) crashes in which tin whisker shorting has been identified as a cause or contributor," he wrote.

Toyota has said that scientific evidence has confirmed that there are no problems with its electronic controls, and that there is no data to show that whiskers are more prevalent in Toyota vehicles than those of other automakers.

Toyota's acceleration problems waned for more than a year until late last month, when NHTSA asked it to recall 154,000 Lexus RX 350 and RX 450H SUVs from the 2010 model year. The agency said floor mats could cause and told owners to remove the driver's side mats until the problems are repaired.

NHTSA also said it has asked Toyota for information about the SUV problems to see if it reported the problems quickly enough. In 2010 and 2011, Toyota paid a record $48.8 million in fines to the government for failing to promptly alert regulators to safety problems.

said it gave NHTSA information about the SUVs in a timely manner after investigators asked for it.

Explore further: Alibaba surges in Wall Street debut (Update)

not rated yet
add to favorites email to friend print save as pdf

Related Stories

Toyota trying to move beyond safety concerns

Feb 09, 2011

(AP) -- Toyota Motor Corp., which built its reputation in the U.S. on safety and reliability, has been cleared by the government of electronic problems in its vehicles. Now it needs to convince consumers that it has put ...

Toyota disputes critic who blames electronics

Mar 08, 2010

(AP) -- Toyota gave detailed evidence Monday that it says disproves claims that electronics may cause the unwanted acceleration that led to the recall of more than 8 million cars and trucks.

Feds to probe cause of runaway Prius in California

Mar 09, 2010

(AP) -- A Toyota Prius that sped out of control on a California freeway was towed to a dealership Tuesday while federal and company inspectors converged on the car to determine whether a stuck gas pedal was ...

Recommended for you

Alibaba makes Wall Street debut

Sep 19, 2014

Alibaba made its long-awaited Wall Street debut Friday on the heels of a record stock offering that opens the door to global expansion for the Chinese online retail giant.

Alibaba IPO to boost employee fortunes to $8 bn

Sep 19, 2014

Employees of Chinese e-commerce giant Alibaba will see their fortunes swell to nearly $8 billion as the company prepares a massive US stock offering that could be valued at $25 billion.

Alibaba mega IPO caps founder Jack Ma success tale

Sep 19, 2014

When Jack Ma founded Alibaba 15 years ago he insisted the e-commerce venture should see itself as competing against Silicon Valley, not other Chinese companies. That bold ambition from a time when China was ...

User comments : 0