This is a video of diagnostics on a failing alternator on a Toyota Yaris 2007 MY with a 1.5L four speed auto set up. The car was making a whirring sound, and would increase in volume when accelerating. Also, it would idle rough due to the lack of electricity that it was being provided. More on how I fixed it (with directions in PDF) here: http://www.toyotanation.com/forum/26-...