[V6-12v] all quiet on the AUDI Front

Tom Christiansen tomchr at ee.washington.edu
Sat Mar 27 00:25:52 EST 2004

At 09:08 PM 3/26/2004, Clive Young wrote:
>In the past I have checked the sensor the following way although I am not 
>sure of AUDI config
>  1 pin is ground
>1 pin is =5 volts
>1 pin = signal out

Eh... I guess that should have been pin 1, 2, 3...

>you should be able to put a voltmeter on signal out and ground and watch 
>the voltage change as you change the throttle position. you should have a 
>steady increase in voltage up to about 5 volts , which is "flood" 
>condition to the ecu with no drop outs of voltage. If you slowly open it 
>and find the voltage drops off at somepoint you have found your problem. I 
>think Tom may have a bently with the info you need.

You may not catch any discontinuities with a voltmeter or ohmmeter. The 
sampling time of the meter (and the response of your eyes) isn't fast 
enough. What typically happens as the pot wears is that the wiper will 
'bounce' on the resistive track. The bouncing happens pretty fast and won't 
necessarily show up on your meter. But it will confuse the ECU.

James: Before buying a new throttle pot, check the connector. Give it a 
good cleaning with contact cleaner.


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