August 2009
This is an Arduino microcontroller that I wired into my car’s ECU and programmed to calculate the instantaneous/average miles per gallon of my 2002 Honda Civic. The circuit reads pulses from the Vehicle Speed Sensor and Fuel Injector wires. It is wired into my car via a USB cable. It’s pretty accurate once calibrated.
The image at the top shows its current location (not in video).
My page on the MPGuino Wiki
Honda Civic ECU wiring
2002 Civic ECU pinout