Getting resistance on maf
 

So I get a cel 31 which is the maf, but it only comes on if I go highway speeds. If i clear the cel, it wont come back for weeks unless i go highway speeds. I get my multimeter and try to check and all the voltages are good, except i get 19ohms as the resistance. What is the resistance supposed to be? If it matters the weather was 42F.
Thanks guys!

http://i916.photobucket.com/albums/a...0/airmeter.jpg
Whether it's an SC300 or SC400, this is correct. Make sure you are testing the MAF/AFM on the right terminals. Compared to this picture, your MAF/AFM might be fine...what car is this?