Toyota said Monday it has still not decided whether its president will appear before the U.S. Congress, but it promised to again look into possible electronic problems with its vehicles.

Toyota Motor Corp. has been criticized as being slow in responding to the unfolding recall crisis, which has ballooned over the past four months to 8.5 million vehicles globally with problems in gas pedals, floor mats and braking.

Calls have been growing for Toyota President Akio Toyoda to answer questions from U.S. lawmakers. Toyoda told reporters last week he planned to go to the U.S., mainly to talk to American workers and dealers.