tps testing

i have a code 21 on my 305 tpi in a 37 chevy. how can i check the sensor with a ohm meter or volt meter. what are the paramaters? at closed position it shows 110 ohms then when gradually opening it drops to .3 and
gradually increases to 4.7at full open. also can this fault cause a ping?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

What you are looking for is a spot where it changes radically. It's like a volume control on a radio. You're looking for the noisy spot. Not easy to find with a digital meter. You say it measured 110 Ohms, then drops to .3.... Is that .3 or .3K Ohms? It should be linear, not go all over the place. If it's bad just replace it.
Al
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.