You can test it with an OHM meter. If you have one with a toner on it, this will work best. Unplug the PTU from the front. It has 2 plugs. Place the ground on the middle pin and the red on the top. Loosen the top and bottom bolts on the PTU and slowly move the PTU until you hear the chim of the meter. You will hear or see it move once it has found closed or open. Those are the two signals that will show you where the PTU is set. Tighten bolts and start the car. you may have to do this twice to make sure your 100% GOOD LUCK
Love the Boost a GOOD Z can put out!!!
90 Cherry Red TT 5 speed 90 Silver NA 2+2 Auto 91 Cherry Red NA Auto (Parts Car) -SOLD 93 White NA 5 speed -SOLD 92 Black NA 5 speed - SOLD