TOKYO— Toyota Motor Corp. on Tuesday shut down all 14 of its factories in Japan after a supplier suffered a computer-virus attack, but the company said the factories would reopen Wednesday.
The supplier, Kojima Industries Corp., said it had server trouble Saturday night and discovered a virus and a threatening message after restarting the server. After struggling with the problem over the weekend, Kojima said it concluded Monday that it couldn’t get its systems in place to work with customers properly on Tuesday.