Truck had an active fault for DPF soot load high and SCR conversion efficiency low. After about an hour of Regeneration and approximately 5 gallons of diesel fuel burned the soot load fault went inactive. Might be a DEF ball in ATD preventing the DEF from reaching the SCR Catalyst or defunct NOx sensor. Conversion efficiency has to be 85% or greater at all times to make the fault go inactive. I just replaced the cylinder head from a dropped valve which caused the engine to run dirty so I may try another Regen to see if NOx output from the SCR cleans up some more. I don't think I ever will own a EPA10 or newer diesel engine because of the constant ATD issues. Here's a pic of some of the ATD instrumentation on my diagnostic laptop.
Truck had an active fault for DPF soot load high and SCR conversion efficiency low. After about an hour of Regeneration and approximately 5 gallons of diesel fuel burned the soot load fault went inactive. Might be a DEF ball in ATD preventing the DEF from reaching the SCR Catalyst or defunct NOx sensor. Conversion efficiency has to be 85% or greater at all times to make the fault go inactive. I just replaced the cylinder head from a dropped valve which caused the engine to run dirty so I may try another Regen to see if NOx output from the SCR cleans up some more. I don't think I ever will own a EPA10 or newer diesel engine because of the constant ATD issues. Here's a pic of some of the ATD instrumentation on my diagnostic laptop.