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ECU USB connection does it required the ecu to be powered up


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I just got given a G4 Xtreme ecu (red one), im not sure of the condition of it as the previous owner had no history on it.

It didnt come with any cables or connectors.

Ive had a quick read through some of the instructions and i cant seem to find a clear answer to my question

For me to connect the ecu via usb do i need to have the ecu powered up from the AMP connectors? or will the usb power up the ecu letting me connect to it?

I ask this as i need to buy the ECU USB cable and Id rather not spend money on the AMP connectors before i know it works.


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