![]() ![]() ![]() ^ Or any other Toyota specific control unit For the purposes of this bulletin, the term "ECU" is used as a generic label for the following SAE J1930 standard references: ECUs have internal security that will not allow them to be programmed with another ECU's information.Įlectronic Control Unit (ECU) is a Toyota term used to describe integrated computerized devices responsible for managing the operation of a system or subsystem. ![]() This bulletin details the Techstream ECU flash reprogramming process and outlines use of the Technical Information System (TIS) and the Calibration Update Wizard (CUW).įlash calibration updates can only be applied to the vehicle/ECU combination for which they are intended. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual service bulletins. Flash reprogramming allows the ECU software to be updated without replacing the ECU.
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