The article here is confusing to me. In the middle of the page he writes, "My voltage was reading 4.39VDC", below that is written, " Once you get the proper setting (0.540VDC +/- 0.075VDC or 0.465VDC to 0.615VDC for MAF equipped car" and then at the end he writes, "Because my previous voltage was over 0.100VDC off". If his inital reading was 4.39 and his target voltage was .540, whouldn't that mean that his previous voltage was off by 3.85 volts and not .100 volts as he writes at the bottom? The reason that I am asking is because the voltage at my TPS is also around 4.39 and I want to know if I should adjust it 3.85 or .1.

Thanks,
Steve

 

he could have keyed it in wrong? i.e. .439 instead of 4.39?

 

Yea, but I want to make sure before I adjust my TPS 3.85 volts instead of .1 volts. Does any one know?

 

Wiggle it around. I tried back-probing the connector with a paper-clip and my readings were all over the place, also make sure you're reading off of the black and blue wires, the grey one doesn't really matter for this (at least it didnt on my rig.)

If wiggling doesn't do the trick, use a straight-pin through the wire itself, that'll ensure you're getting a positive connection.

Hope that helps.

 

at idle the TPS reading should be in the neighborhood of .54v, at WOT the reading should be above 4.0v

-John

 

The chilton's manual I have said to take the reading with engine off, but the key turned to the on posistion; is this not correct (I took the reading with the engine off)?

 

You're fine with engine off/key on. You can move the throttle with your hand to open it all the way and test it at WOT position. If you get in the neighborhood, I really don't see it as an exact thing because the ECM resets its position to 0% every time you turn off the engine and back on.