Solid Red Engine & wrench in triangle ( NO codes)

[AJMFreight]

When running the scr test, the intake ppm 60-80, and the outlet was 20ppm then went to -2ppm. Couldn’t finish scr test, states to cool engine and Aftertreatment down. After that message could not run either regen or scr test even when cooled down. When running the diesel particulate matter regeneration test, I noticed the Aftertreatment scr intake and outlet temperature signal voltage were both at 0.00v never changed. However the diesel particulate matter regeneration test past. I’m not sure if any of this has anything to do with what’s going on, but was just running tests.