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So i went out and drove 70mph on the highway in 4th again and the check engine light came back on. I hooked the EGR back up and I hooked up my vacuum gauge to the EGR and went 70mph in 4th again and low and behold every so often it sees vacuum when the black box activates the EGR. I was also able to see the egr work when you cruise in 2nd or 3rd gear at a high rpm.
As I expected though, through normal driving when I always coast in 5th gear I never saw vacuum on the egr, leading me to believe that the EGR rarely is used on the d15z1.
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