For access to J-2534 Information on the Toyota/Scion/Lexus service information website:

  1. Under "What is TIS", click on "Scan tools and Vehicle Programming".
  2. Click on "J2534 Reprogramming".

Powertrain Reprogramming 

Beginning with some 2001 models and expanding to all models by 2007, Toyota/Scion/Lexus vehicles have flash reprogrammable powertrain ECMs.

Reprogramming is only performed if a Technical Service Bulletin or Service Campaign provides direction to do so. Flash reprogramming can be accomplished using a scantool or a PC and a "Toyota validated" J2534-1 interface.

Scantool Reprogramming
Toyota/Scion/Lexus ECMs can be reprogrammed using either TIS techstream, Techstream Lite, previous Toyota/Lexus factory Diagnostic Tester, or the Vetronix Mastertech scantool. The ECM reprogramming function is only available with the authentic Toyota factory scantool software which runs on any of the above mentioned scantools. Please reference the following link for more information: TIS Techstream
The Toyota Diagnostic Tester scantool can be used for all flash reprogrammable Toyota/Scion/Lexus ECMs, 2001 through April 2007. The Diagnostic Tester Scantool is not recommended for service reprogramming operations introduced after April 2007.  Please reference the following link for more information: Toyota Diagnostic Tester Scantool / Vetronix Mastertech

NOTE: The Toyota Diagnostic Tester is no longer supported and replacement parts are not available from Toyota. The last software release for the Toyota Diagniostic Tester was version 14.1 and was issued in April 2007. Version 14.1 will provide diagnostic support through the 2007 Model Year and reprogramming support for calibration files released up to April 2007.

All Toyota/Scion/Lexus ECMs that can be reprogrammed with a scantool can also be reprogrammed using a PC and "Toyota validated" J2534-1 interface.
Go to or and follow the link entitled Scan Tools & Vehicle Reprogramming. TOYOTA RECOMMENDS USING ONLY VALIDATED INTERFACES THAT APPEAR ON THIS LIST.