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Diagnosing "Write ECU" and Harness Installation Errors


If you are experiencing issues with reading or writing to your ECU, please watch this troubleshooting video and refer to the detailed information below. 


The most common reasons the write process is interrupted are:

  • Harness Connection/Installation issue:
    • Check the Installation Guide and double check each step of the install.
    • Check you have fitted any extension harness correctly to the ECU plug.
    • Check all the wires are firmly locked into the ECU plug, and are not loose.
    • Check your diagnostic plug is clean, and making good contact (if used)
  • Low or Loss of Power to the ECU:
    • Battery power should be 12.8v or more.
    • Run/Stop switch must be in the RUN position.
    • Check for a loose connection between the Interface and the ECU
    • Do not move the interface/harness during flashing (aka loose connection)
    • Connect a battery charger at the same time, (So the battery does not drain while flashing)
    • Check you are switching the Ignition key on/off at the right time. (follow software prompts)
  • Computer interrupted the write process:
    • PC should be checked that all updates are installed, and has been restarted.
    • Check the PC is not busy doing background tasks
    • Check your PC is powerful enough to keep up with the ECU write speed (Minimum Dual Core 2.4Ghz, 4 Gig Ram. Recommended i5 with 8 Gig Ram)
    • Check your USB port is not worn out (try another USB port)
    • Use the supplied USB cable. Do not use a long cable.
    • Check your PC Battery is fully charged if using a Laptop.



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