Akio Toyoda is making good on his pledge to restore Toyota Motor Corp.’s reputation for quality.

The Japanese carmaker’s luxury Lexus line retook the top spot among all auto brands in J.D. Power & Associates’ Initial Quality Study, advancing from fourth last year, the market- research company said yesterday. Toyota’s namesake brand ranked seventh, up from 21st a year ago, reported Bloomberg.

The performance matched Toyota’s results in J.D. Power’s 2009 survey, before the first recall of its vehicles for floor mats at risk of jamming accelerator pedals late that year. Toyoda, the carmaker’s president and grandson of its founder, formed a global quality committee last year to tackle defects following recalls of more than 10 million vehicles.

“It shows the true quality of Toyota without bias and that the users re-appreciated the value of Toyota after it was proven it didn’t have quality problems,” Mamoru Kato, a Nagoya, Japan- based auto analyst at Tokai Tokyo Research Center, said of the survey result. “The company has overcome the bad image created by the series of recalls.”

Toyota was the only large automaker to post a sales decline last year in the U.S., historically its most profitable market. The company’s deliveries fell 0.4 percent to 1.76 million Toyota, Lexus and Scion vehicles, contrasting with an industrywide increase of 11 percent, the first since 2005.

Lexus ES, GS and LS models topped all “premium car” segments in the J.D. Power survey, which measures consumer complaints in the first 90 days of vehicle ownership.

Toyota rose as much as 1.7 percent in Tokyo trading, the biggest intraday gain in two weeks, and was up 1.2 percent at 3,290 yen as of 2:07 p.m., compared with a 0.9 percent advance in the benchmark Nikkei 225 Stock Average.

Toyota’s decline in the survey last year “was largely driven by consumers being concerned that they might have a problem on their vehicle and it was unique to the 2010 model year,” David Sargent, J.D. Power’s vice president for global vehicle research, said in an interview.

Following the record recalls, Toyota added 40 engineers last year in Toyota City, where the company is based, and created teams to scrutinize the designs of components. With its heightened focus on quality, Toyota also reduced the number of new development projects, according to the company.

In the U.S., Toyota hired additional engineers at its technical center in Ann Arbor, Michigan, as the facility plays a bigger role in developing models for the American market.

“Toyota has been making extreme efforts on quality,” said Edwin Merner, president of Atlantis Investment Research Corp. in Tokyo. The J.D. Power results are “very positive for Toyota,” he said.

In the 2011 survey, Toyota brand owners reported 101 problems per 100 vehicles, an improvement from 117 last year.

“The results point out that our quality really hasn’t gone away,” Mike Michels, Toyota’s vice president of U.S. external communications, said in an interview. “It was there before, and it’s there now.”

Lexus had 73 problems per 100 vehicles and had four models rank highest in their respective vehicle categories. The Lexus LS sedan had the fewest defects of any model, with 54 problems per 100 cars. Lexus factories in Canada and Japan received J.D. Power’s highest award for plant quality.

“Toyota has rebounded with its steady efforts, and having it on top of the ranking is a source of comfort for investors,” said Takashi Aoki, a Tokyo-based fund manager at Mizuho Asset Management Co., which owns Toyota stock.