Thanks a lot dam good information right there The newer diesels will put a guy in the poor house with all that crap on them.most of the time we never get them fixed the first time Thanks again you said it right Sam
What we are seeing a lot of is the dealer techs mis-diagnosing these for expensive repairs when it's really just the test criteria not being properly met.
on the def injector quantity test go by what manuf says on that test. gm may was 50 ml but I believe ford is different. always check service data on def injector quantity test. for egt temp sensors on ford's the exhaust aftertreatment egt sensors ARE NOT NUMBERED SEQUENTIALLY!!!! so don't assume all manufactures do what gm did. can you explain why the exhaust after treatment needs so many egt sensors? it's something I can never get an answer for that. a lot of great information and testing proccedure. thank you for the video would love to see more videos like this.
Great advice, I say read the service information on EVERY repair. I havent ran into the EGT's not numbered sequentially, but I'm sure they are out there. The reason for so many EGT's, is the PCM needs to see if the action commanded was actually carried out. (i.e. Service regen requires EGT 2 and 3 differential, SCR functionality requires EGT 3 and 4 differential.)
@@fixingcarswith15thstautomo36 when dealing with diesel exhaust after treatment system when you use your scan tool to force a "regen" what is actually happen. does regen only focus on the DPF and burning of the soot with extra diesel fuel being introduced into the exhaust stream or is it referring to just the SCR or is it both?
For what ever reason, the pcm thought there was a lack of SCR production. Could have been NOx sensor, engine temp too low, EGT too low, def injector not flowing properly,or the SCR starting to get weak. As soon as the pcm starts to see a lack of SCR production it will conduct a Reductant Fluid Quality Test if it doesn’t pass that test it derailed the engine until it does pass.
Finally someone explains but this system works. Detailed and beautiful explanation. Thanks for the lesson.
The diag community has so many great people that offer their assistance to other techs, it makes me proud to be part of the group.
Very well explained, and I'm sure a lot of your subscribers including myself, appreciate this video very much..!!!
Awesome, thank you!
Thanks a lot dam good information right there
The newer diesels will put a guy in the poor house with all that crap on them.most of the time we never get them fixed the first time
Thanks again you said it right
Sam
What we are seeing a lot of is the dealer techs mis-diagnosing these for expensive repairs when it's really just the test criteria not being properly met.
Please show us the data pit next time and explain ❤❤❤❤
on the def injector quantity test go by what manuf says on that test. gm may was 50 ml but I believe ford is different. always check service data on def injector quantity test.
for egt temp sensors on ford's the exhaust aftertreatment egt sensors ARE NOT NUMBERED SEQUENTIALLY!!!! so don't assume all manufactures do what gm did.
can you explain why the exhaust after treatment needs so many egt sensors? it's something I can never get an answer for that.
a lot of great information and testing proccedure. thank you for the video would love to see more videos like this.
Great advice, I say read the service information on EVERY repair. I havent ran into the EGT's not numbered sequentially, but I'm sure they are out there. The reason for so many EGT's, is the PCM needs to see if the action commanded was actually carried out. (i.e. Service regen requires EGT 2 and 3 differential, SCR functionality requires EGT 3 and 4 differential.)
@@fixingcarswith15thstautomo36 when dealing with diesel exhaust after treatment system when you use your scan tool to force a "regen" what is actually happen. does regen only focus on the DPF and burning of the soot with extra diesel fuel being introduced into the exhaust stream or is it referring to just the SCR or is it both?
Why was the system in fault mode initially?
For what ever reason, the pcm thought there was a lack of SCR production. Could have been NOx sensor, engine temp too low, EGT too low, def injector not flowing properly,or the SCR starting to get weak. As soon as the pcm starts to see a lack of SCR production it will conduct a Reductant Fluid Quality Test if it doesn’t pass that test it derailed the engine until it does pass.