Yamaha e-Bike Diagnostic Software is primarily a dealer-exclusive tool. While you can find user manuals and installation guides online, the official download for the Yamaha Diagnostic Tool (YDT)
If you own a Giant, Haibike, or Yamaha e-bike with a PWseries motor, you know these drivetrains are bulletproof. But like any high-performance computer, sometimes they need a reboot, a firmware update, or a deep dive into error logs. yamaha e-bike diagnostic software download