Font Size Selector

Technology, old cars, & other stuff...


Saturday 28 January

ECU Source Code

Jet1 Engine Control Unit (ECU) Software provides fuel management, ignition timing, cooling fan control for inline 4 cylinder internal combustion engines. The ECU Software (or Firmware) is intended to run on the Arduino Mega 2560 microcontroller. A compatible Windows 10 application provides the ability to monitor and configure the ECU.

The source code for the JeT1 ECU, plus configuation guide and Windows desktop / laptop application are available here:-

Date ECU Version ECU Code Documentation Windows App Remarks
March 2019 0.52 link Config Guide link
  1. Revised NVM allocation. Previous XML configuration data files no longer compatible.
  2. ECU firmware, configuration files and desktop app compatibility checks incorporated.
  3. Idle controllers (Mini & Golf 3) now included in the build and can be selected at run-time using appropriate NVM parameter.
  4. Target TPS adjust function from host computer, allows TPS to be adjusted live to aid setting the idle throttle position.
  5. Provides post start idle throttle (PSIT) - a short period of increased idle speed to aid starting.
  6. Ignition & Injection inhibited until solid trigger wheel synchronisation achieved.
August 2018 0.4D  link

Config Guide

  Rate of injection & ignition calculations increased to every 5 milli-seconds, or 200Hz (from 100Hz in previous versions). Provides better accuracy and response at high RPM.
July 2018 0.4C link

Config Guide

Application Interface Diagrams

link Additional functionality and refinements for Nissan CR14DE engine.
August 2017 0.3B link link link First published version.


The software/firmware source code or executable program developed by Just Technology (NW) Ltd is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. The license is available at

The software/firmware source code or executable program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

Privacy Notice

The elements of this website developed by Just Technology uses cookies to store user settings such as the requested font-size to enhance the usability of the site. For reqistered users, cookies are also used to identify the user's logged-in status.

The elements of this website developed by Just Technology do not attempt to access cookies sent to your computer by other websites you have visited nor will it try to obtain any other information from your computer for use by Just Technology or for passing on to any other party.

This website uses 3rd party software from Disqus, Twitter, and Facebook. The privacy policy of these vendors is therefore applicable to any facilities provided by these 3rd parties. Just Technology cannot provide any statement regarding protection of your privacy with respect to the facilities provided by these 3rd parties and cannot accept any responsibility for the way that any facility provided by them interacts with your computer or uses the information obtained from you or your computer.