The Prius Mini-Scanner Project


User Manual

Firmware Update


The Prius Mini-Scanner is a device that reads information from the computers in a Toyota Prius and displays it for your edification and delight.  The instrumentation provided on the Prius is quite rudimentary, especially given the technology in the car's powertrain.  The Prius Mini-Scanner augments the built-in instruments with engine r.p.m., coolant temperature, traction battery current and state-of-charge and much, much more.  You can mount the Prius Mini-Scanner behind the steering wheel where most cars have their instruments.  It connects to the car using the existing "OBD-II" diagnostic connector and can be left in the car at all times.  You do not need to cut any wires or modify the car in any way to install a Prius Mini-Scanner.

If you own a Mark I Mini-Scanner, you are in the right place to find supporting documentation.

If you do not own a Mini-Scanner or you own a Mark II Mini-Scanner, you should really be at

Mini-Scanner Home

Prius Home

Graham's Web Site Home

Last edited August 18, 2003.  All material Copyright 2003 Graham Davies.  No liability accepted.