ECU Engine Control Unit AT159414 For John Deere 790ELC Excavator. Part Name: Engine Control Unit. For John Deere 790ELC Excavator. Please provide your car model before place an order. UPS Surepost usually takes 1-6 workdays. UPS GROUND usually takes 1-5 workdays. All these transport timeliness Don’t apply to remote districts. Please make sure it is correct. We will do our best to offer you satisfied resolutions. Please keep patient because you and us may have time difference, any issue will be solved via friendly communcation.