http://www.cygnusx1.net/supra/library/TSRM/ec/EC_03.gif
Try that... it is located underneath the intake manifold in a very bad spot. My wiring harness had broken and I was forced to try and splice the wires - I think that was one of the hardest things having to be done while leaving all of the parts on!
Even if yours is a GTE engine, it's in the same location.
Let me know if you find it, I've got my block apart for a swap, just waiting for the JDM, so I can always go find it on the harness.