Early calibrations only do an SCR Performance Test, with no crystal sublimation. The new test is hot enough for crystal sublimation, and will clean the SCR. If there's DEF inside the SCR, I make sure the software is current and perform the SCR System Test. If there's dried DEF, I remove it and clean it. If the pressure is good during the test, the volume will be OK too (at least from what I've seen). If it's off by more than 100 ppm, there's trouble. I read the Freeze Frame to see what NOx adaptation is. With that data and EGTs, it's not that bad to diagnose. When a Cummins has trouble with NOx conversion, they begin shifting the NOx adaptation number. ![]() They also give you NOx adaptation factor on both sensors. ![]() Cummins gives you NOx in and NOx out of the SCR. It's not a terrible code to diagnose on these. Salesman said it's had a lot of $ spent fixing this problem recently.
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