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codes....Help

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I tried unplugging my Boost sensor (map sensor) after reading it would make for some good smoke. I was going to do a smoke switch but figured I would try that to see if it did anything before putting in the switch and having not work. I figured if I set a code I would just clean it out with my Hypertech Hyperpac. Truck ran bad and set a code. I scanned and found 2 codes. The first was low/no boost signal (duh!) and 1693. I found that one means it set a code in both PCM and ECM. I cleared the first code but the 1693 keeps showing up. So now I found out my programmer doesn't clear the PCM. I key on/key off and find codes 0500 and 1694, I don't know how long those codes have been there because I just found out that you can key/ key off these trucks ( I thought that only worked on older stuff). Do these codes affect the way the truck runs and fuel mileage? It seems to me my truck runs best and mileage is best when no codes show in the ECM. How do I get rid /fix them. The truck seems to run ok right now but I haven't driven much yet.Thanks

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So it means a broken wire or loose connection? Does it affect the truck? Is there a common cause? Thanks

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Thanks for the info. I really appreciate the quick response.

--- Update to the previous post...

I noticed in the diagram you posted that the radio is part of the ccd circuit. My radio has some issues but does still work. Could it be setting the 1694 code? I also want to explain about unplugging my boost sensor to get smoke , I know that isn't something other Cummins owners appreciate. I understand the importance of not going around like an idiot giving the environmentalists ammo for their cause. It was just for when no one was lookin. Thanks again

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