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Matt what mike means is its a typical electronic circut which can be either high or low. The ECU circut has a resister or something simlar that holds the input at 5v if the pin is grounded the amount of leakage won't satisfy the load and the pin will be pull low. The sensing side of the circut is effect when the wave form goes from high to low. May be if you think of a rope being pulled at both ends and one end has the advange and is winning being 5V now we add some people to the other side and the rope moves to the ground side. As the ropes move in the new direction the movement is picked up.
Hope that helps it seem that most of the electronic circuts on the SVX operates on the same princple.
Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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