TPS resistence

[Bruce Plecan]

-----Original Message-----
From: Tedscj at aol.com <Tedscj at aol.com>
To: DIY_EFI at efi332.eng.ohio-state.edu <DIY_EFI at efi332.eng.ohio-state.edu>
Date: Monday, November 02, 1998 7:19 PM
Subject: TPS resistence


The TPS is not just a variable resistor.  There are a couple components in
there.  +5 from ecm, dedicated groung to ecm, and sensor lead to ecm.
Don't share grounds or power other than as shown in the book.
Very careful if you need to bend the tang, to get the geometry right.
Cheers
Bruce


>I'm new to the list and I already have a question!
>THe question is : what resistence should a GM tps read at full throttle
>(turned @ 90 degrees)?
>The reason I ask is that I spent the whole afternoon trying to adapt and
>adjust a GM TPS to my throttle-body.  The manual I have says it should read
>between .45 and .85 volts at idle.  The problem I had was I couldnt get it
in
>that range.  I would move it slightly but it would jump from .2v to 1.0v.
>Also, It would read a different voltage every time the throttle came to its
>stop.  Finally, I got it to read .55v, but when I gave it full throttle (90
>degrees) it only read 1.98v instead of 4.5 - 5 v!
>Anyway, before I throw this TPS out and buy another one I want to be sure
its
>not my wiring, ECM, rig, etc. by measuring the resistence directly at the
>TPS(and not volts thru the ECM)
>Thanks for any help,
>Ted
>
>PS  Its a GM throttle shaft driven TPS (not the lever type) if that makes a
>difference.
>