tbtanmay111/triumph-speed-400-can-map — explained in plain English
Analysis updated 2026-05-18
Build a custom dashboard or data logger for a Triumph Speed 400 or Scrambler 400 X.
Import the included DBC file into CAN analysis tools like SavvyCAN or cantools.
Look up the exact byte and formula for a specific signal like RPM, speed, or fuel level.
Use the passive listening method as a reference for reverse-engineering other vehicle CAN buses.
| tbtanmay111/triumph-speed-400-can-map | 0xdea/ttyinject-rs | 0xhossam/uncanny | |
|---|---|---|---|
| Stars | 12 | 12 | 12 |
| Language | — | Rust | C |
| Setup difficulty | hard | moderate | hard |
| Complexity | 2/5 | 4/5 | 5/5 |
| Audience | developer | researcher | researcher |
Figures from each repo's GitHub metadata at analysis time.
Requires an ESP32, a CAN transceiver, and physical access to the motorcycle's diagnostic connector.
This repository is a reference document, not a piece of software. It maps out the internal computer network of two motorcycle models, the Triumph Speed 400 and Scrambler 400 X, both built by Bajaj with a Bosch engine control system. Modern motorcycles constantly broadcast data such as speed, engine RPM, and gear position over an internal wiring network called a CAN bus, and this project figured out what each piece of that broadcast data means by listening to it, without sending any commands back to the bike. The author built a small listening device using an ESP32 microcontroller and a CAN transceiver chip, connected to the bike's diagnostic port, and recorded the traffic while performing specific actions like braking, shifting gears, and using the indicators, as well as during an actual ride. By watching which numbers changed when a specific action happened, they worked out the meaning of dozens of signals, including RPM, speed, throttle position, coolant temperature, fuel level, brake status, and battery voltage. The results are written up in a companion file with the exact byte positions and formulas, along with a database file that can be loaded into common CAN analysis tools. Some values, like intake air temperature and total mileage, are not sent out on this broadcast network at all. The author tracked these down separately using a different diagnostic connector and a common OBD tool, and also cross-checked the whole map against an official Triumph wiring diagram, which confirmed the findings were accurate. This project builds on and credits earlier work by another developer who had already decoded some of the same signals, and adds several new ones that were not previously documented. The repository is aimed at motorcycle owners, tinkerers, and developers who want to build their own dashboards, data loggers, or diagnostic tools for these bikes. The author includes a clear safety warning: only listen to this network passively, since actively sending data to it with a cheap adapter can disable the bike's onboard computer. The findings are shared as best effort and should be checked against your own motorcycle. It is released under the MIT license, which allows free use with attribution appreciated.
A reverse-engineered reference map of the internal CAN bus data broadcast by the Triumph Speed 400 and Scrambler 400 X motorcycles.
Use freely for any purpose, including commercial use, as long as you keep the copyright notice, attribution is appreciated.
Setup difficulty is rated hard, with roughly 1h+ to a first successful run.
Mainly developer.
This repo across BitVibe Labs
Don't trust strangers blindly. Verify against the repo.