1991 Toyota Pickup EGR valve

There are a couple ways to check this, but the first way is to check for codes.

Here is a guide that will help with this:

https://www.2carpros.com/articles/toyota-trouble-code-definitions-and-code-gathering-method-1990-1995

Also, here is a guide that will help with testing the valve itself which contains really good info:

https://youtu.be/DqUCbbKdWf4

However, the definitive way is to use the testing that we are attaching below.

Please run through this info and let me know what you find. Thanks