Toyota Motor Corp. has been hit by dual setbacks after a U.S. regulator renewed its scrutiny of the carmaker over unintended acceleration and the company embarked on a recall of 690,000 pickup trucks.

As many as 1.69 million Toyota Corollas with model years from 2006 to 2010 are subject to the probe after owners said they experienced unintended "low-speed surging," according to a notice Monday from the U.S. National Highway Traffic Safety Administration.

Separately, Toyota recalled Tacoma trucks to fix suspension parts that could break.