Need help with 2017 freightliner cascadia? temp sensor?

You turned the cruise on and hit resume?????

That's how the system works. Programmed straight from FL.

 

Why mess with it?

I mean if you do and it shows a check engine light, they pull it in to be checked, they will see you're messing with it because of the idle times.

 

If he's running a Qualcomm or people net system, they already know his idle times

 

Mine is a 17 also. Nothing overrides the shutdown. However my idle settings are 35-65. So I don't have much of a problem. On mine if the truck is running the sensor usually shows about 3-5 degrees hotter. But the sensor is under the drivers side mirror, you can push the convex mirror back and unplug it. Mine will run if you do this. However it does turn on check engine lights. They will go off after you plug it back up though.
Some places they will run if you tape the override button down. But mine won't.

 

The ecm stores trouble codes. And how many times. Even if the light is out.

Could be gambling with your job. When the end gets looked at.

Turning on the cruise and tapping resume. Raises the idle to 800 and will idle for 10 hours. If that don't work then the company probably had it turned off.

 

That's why taking a hot hands to the sensor works so well

 

That or park next to an idling truck. Between the 2 trucks running it could be 10 degrees hotter on the sensor. Now if you are in cold weather that may not be good but I run FL 2 times a week so it works great for me. That and it's also almost always over 65 degrees down here so I can idle anyway.
I know my truck won't run if you idle it up, doesn't matter how high you idle it.
I'm one of those guys that likes to figure out things and I've done everything to mine and the only thing that worked was unplugging the sensor. I've only done it once just to see if it worked and it did. But with my idle settings 35-65 I really can't complain to much

 

Also I haven't had the time to play with it but all the sensor is is a resistor. I was gonna test the resistance of the sensor at 80 degrees. And make a dummy sensor to plug in when I need to. Pretty much just a resistor of the same resistance as the sensor at 80 degrees. In my mind it should work, but I haven't had a chance to play with it. Shouldn't give off any codes or anything. If you turn the truck off unplug the sensor and push the resistor in there. Then do the same when you ready to pull out.

 

Yes should work I have read about a driver doing this... I believe he used 15ohm resistor to set it at 100 degree

 

You can call truck drivers many things, but "not very MacGuyver-like" is not one of those things.