JDM 2JZGTE Autos have the line pressure controlled by the ECU, not a cable.
One thing to check is that the AEM has the ability to control the line pressure... I think it does but it's been a while since I looked at it.(I can't remember but I think USA 2JZGTE autos had a cable for line pressure?)
Other things to look at are wiring or ECU.
Cheers
Wilbo
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