I'm a little confused so here's a better test. Put the meter's black lead on the engine block or the battery negative post, and the red lead on the center terminal in the TPS plug. Take three readings, one at idle, one at half throttle, and one at full throttle.
You should find close to 0.5 volts at idle and close to 4.5 volts at wide open throttle. The voltage should go up and down smoothly as you move the throttle. If it does, both other wires have to be good.
Since you have a scanner, you should see the same change in voltage when you view live sensor data. If you do, there is something we aren't interpretting correctly about that 87 percent.
Wednesday, May 25th, 2011 AT 4:23 AM