WOT potentiometer measurements

[benswann at comcast.net]

Phil,

My interpretation is that resistance can measure "up to" 3600 ohm, but not be
more than.  I as you observed a linear relationship with throttle position that
capped out around  2.7 k ohm for me.  I interprete my reading to be within
spec. and as there was no jumping around in the reading as I opened up the
throttle, this is OK.

I did find one anomoly which I have not fully resolved and that is on mine,
Coltage supply reading between pins 1 and 3 was 3.3V and not within the 4.5-
5.5V specified.  I must have a wiring problem or (hope not) bad ECU.  Reading
between pins 1 and 2 was 5V and within spec.

I correlate this bad voltage between pins 1 and 3 with an acceleration and
deceleration surge/hiccup as well as poor fuel economy.  I may need to run a
new wire.

Ben

Date: Wed, 6 Aug 2003 21:19:11 -0400
To: 200q20V mailing list <200q20v at audifans.com>
From: Phil Rose <pjrose at frontiernet.net>
Subject: Re: WOT potentiometer measurements

At 12:00 AM -0400 8/5/03, Phil Rose wrote:
>I've never been sure how to interpret the resistance that is
>specified (between terminals 2 & 3) for when the throttle is opened
>fully. Bentley states that when the throttle is slowly opened wide,
>that "resistance must increase to a maximum of 3600 ohms."
>
>So, what does the Bentley's statement (i.e., "resistance must
>increase to a maximum of 3600 ohms.") really  mean?
>(1) The resistance increases to some (any?) value that is not more
>than 3600 ohms?
>  or
>(2) Resistance must actually reach a value of 3600 ohms (and no higher)?
>
>I've been assuming it's (1).
>
>Anyone have authoritative info about whether (or not) a value of 2800
>ohm is OK?

Doesn't anyone on the list have a BTDT concerning this
throttle-potentiometer spec?
Please don't take the "authoritative" part too seriously. ;-)
I can't imagine that I'm the only one who's done resistance
measurements on the throttle potentiometer.

Phil
--

Phil Rose
Rochester, NY
mailto:pjrose at frontiernet.net