Someone had asked for these and I tracked them down, attached are both the ECU pinouts for the 2001 and also 2002-2005 Lexus IS300.
Disclaimer – I don’t take any responsibility for these diagrams, these do seem to be the factory pinout diagrams but I always like to double check / cross reference any wiring. Also I do not own a IS300 and can’t confirm these ECU pinouts.
Wiring Diagrams can be found here – http://www.2jzgarage.com/2013/04/is300-wiring-diagrams/
need ecu pinout for 2jz vvti
ECU pinouts – http://www.2jzgarage.com/2012/01/supra-2jzgte-vvti-ecu-pinouts-97-8-02/
Wiring Diagrams – http://www.2jzgarage.com/2012/01/supra-2jzgte-vvti-wiring-diagrams-97-8-02/
Body Loom – http://www.2jzgarage.com/2012/01/supra-2jzgte-vvti-body-loom-pinouts-97-8-02/