I've done this with a simple voltage divider and a switch.
Yes it works, but you can't simply hold +5V to the TPS input. The power light will eventually shut off after 5-10 seconds or so if the voltage is remained constant.
However, what you can do which DOES work is pulse +5V to the TPS input on the TCU with a 555 timer. I gaurentee that will work 100%.
Here was my original post: http://www.subaru-svx.net/forum/showthread.php?t=20197
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Mike - Proud owner of a Pearl 92 SVX LS-L 5MT with 78k miles and climbing 
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04 WRX 5MT, STi Short Throw Shifter, Group N tranny mounts, AZA Z-2 18x7.5 Rims, slotted/cross drilled rotors, stainless steel lines, 35/20% window tint, ecu bead crush, power mode button; 7" In-dash touch screen LCD, mobile computer, voice recognition, alpine PXA-H701 DSP, 2 JBL amps, focal speakers all around, 5 farad cap, and fiberglassed subs in the trunk.
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Last edited by rmjjensen; 09-01-2006 at 06:50 AM.
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