The KWP2000 is a communications protocol used for on-board vehicle diagnostics systems (OBD) by Suzuki (SDS), Kawasaki (KDS), Yamaha (YDS), Honda (HDS) and more. It is standardized by the ISO 14230 and it is compatible with the ISO 9141. Both uses a single line called the K-line through it we send some Parameter IDs, knowns as PIDs, to the Electronic Control Unit (ECU). This way we have total control on the motorbike: we are able to ask for sensors data (such as rpm, gear, speed, temperatures, etc.), see error codes and clear them, upload/download and more.

If you want to read more about this protocol and OBD-II you can see the protocol explained.

Any microcontroller (MCU) that uses the Arduino framework could be used.

The K-line works at 12V so you need an integrated circuit (IC) as interface, for example:

• L9637
• MC33660
• MC33199

Or, you can also use operational amplifiers/level shifter/transistors.

The library would work on Suzuki and Kawasaki motorbikes. I didn't had the possibility to test on Yamaha and Honda bikes but I am willing to do, if you own any one of the two open an issue and I will write some code for it.

This is a list of motorcycles that have been successfully tested:

If your motorbike is not in this list open an issue and tell me if the library worked 😁

Simply search for KWP2000 in the Arduino/PlatformIO Library Manager or download this repository and add it to your library folder

You have to find the K-line of your bike. Usually it's under the rider's seat. You just need to connect the K-line, VCC and GND to the driver IC you bought

Example of the wiring for the L9636:

If you wish also to be able to enter easily into this mode add an optocoupler with a ~330omh resistor between the MCU and the dealer pin

Go to PIDs.h and de-comment (delete the // symbols) your motorbike, then upload the basic_working example.

I made a ECU Emulator written in python for the development of new functions and tests.

Generally the functions return true if everything went fine, a negative number if there where any error, false if nothing changed

This documentation has been automatically generated with doxygen + doxylite, an automatic documentation generator, I will make the formatting nicer later.

See it here documentation

I do not assume and hereby disclaim any liability to any party for any damage to propriety or person

• ECU Hacking forum:

  • https://ecuhacking.activeboard.com/t56234221/kds-protocol
  • https://ecuhacking.activeboard.com/t22573776/sds-protocol/

• Arduino forum:

  • https://forum.arduino.cc/index.php?topic=236092.0
  • https://forum.arduino.cc/index.php?topic=334778.0

• Others