When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
There is no way to test the EEC Computer.
You can look at the out puts to see if it is grounding them.
If they just ran a code check with a code reader and got a 11 on the KOEO test that will not tell you much.
If the fuel pumps are not running when you turn on the key you will not get the 11 in KOEO or in the CM scan for codes.
If you took it out the only way to test it is to put it in the same year and type of truck.