When manual swapping many Lexus and Toyota models and retaining the factory Automatic ECU it is necessary to install an ATEMU to trick the ECU. 
This allows the succesful removal of the automatic transmission, retains the use of VVTi and other engine functions.
List of vehicles we have instructions for to date are:
USDM spec 2JZ-GE 2001 ONLY
Altezza AS200 1G-FE
Altezza RS200 3S-GE
GS300/Aristo 2JZ-GE
Crown JZS171 1JZ-GTE
Chaser JZX100 1JZ-GTE
Chaser JZX110 1JZ-GTE
Verossa GX110 1G-FE
1UZ-FE VVTi (various applications)
And more
When ordering please use the notes box to state the vehicle, engine type, year of manufacture. This will assist us to ensure you get the correct instructions first time. Alternatively please use the contact us section prior to ordering to discuss the application.
We do not recommend an ATEMU for UK IS300 2JZGE or any 3UZ ECU, please see the link below for our ecu remapping service for these applications.
https://www.soarsperformance.co.uk/product-page/lexus-ecu-remapping-service
Please note during busy periods there may be a delay in shipping orders. Please contact us for up to date shipping schedules and stock availability.