Subaru Corp. revealed fresh cases of improper final vehicle inspections on Friday in a final report on its series of data falsifications that blamed excessive workloads on inspectors for causing the practice.

The Japanese automaker has newly found that its inspectors failed to take proper steps in checking brakes and speed meters. The number of affected vehicles is difficult to know as the conduct came to light based on hearings with employees, it said.

Subaru has already been grilled over the earlier finding that its inspectors fabricated fuel and emissions data, which prompted the company to launch an in-house investigation.

The improper inspections, believed to date back to the early 1990s and which first surfaced in March this year, has affected 1,869 vehicles, up from 1,551 announced in June, the automaker said.

Employees who lacked "awareness of norms," as well as "insufficient supervision" by management cased the series of scandals, according to the report, submitted to the transport ministry earlier in the day.