How the SCR system works and how to think through problems

We will look at a couple illustrations showing how the scr system works.
How to think through issues by understanding what goes on in that system.
We Identify a couple sensors not commonly talked about. This should shore up your thinking when thinking through SCR issues.

[@jessewwpco4574]

I'm a seasoned mechanic but i recently got a job as a diesel mechanic. These are helping a ton! Thank you!

[@MrRyanrk12]

Thanks joe

[@009Avadh]

Your videos are really detailed. So much to learn from . Any tips for troubleshooting faults for nox sensor and PM sensor .

[@ENGINESHOPJOE]

yup they are coming keep watching

[@johnavalos6010]

Cummins ISB 6.7 5655 code pops up, often. We checked everything that insite told us too. Could contamination of the def fluid cause code 5655...scr conversion condition exist.

[@ENGINESHOPJOE]

If you checked ALL the systems put the esn in qsol to be sure there is not a campaign on the scr brick. And check calibration revisions. We just had a unit that was failing the scr brick and a calibration update corrected the issue

[@johnavalos6010]

Thank you. I'll start there