Cascadia DEF problems and a surprise compression issue at the end.

2017 Freightliner Cascadia came in with active fault codes.
SPN 4374 FMI 0 Under Pressurized DEF system
SPN 520342 FMI 17 DEF system rationality DEF pump speed high
SPN 521049 FMI 31 DEF inducement DEF Lamp Active
SPN 521052 FMI 31 DEF inducement CEL Lamp Active
A simple ADS self check is the best place to start, this is a pass or fail. Next go underneath the truck and look for signs of DEF that has crystallized. A DEF quantity test can verify if DEF is being introduced into the system.
At the end of the testing we found the DEF pump was faulty but was out of warranty.
As a bonus, we found the compression was failing in two cylinders which did require a valve adjust which improved after the valves were adjusted.

[@HectorWPadilla]

Great video 👏. The POV underneath the truck was a nice touch 👌 The not so happy ending tho , uff that was tough 😅

[@CarlosDieselElectric]

@@HectorWPadilla I agree. Definitely one of the things I don’t like about the DD engine. Hope they make improvements. Seems to be one of a few Achilles heels

[@heavywrenchkris]

Love your videos man!

[@CarlosDieselElectric]

@@heavywrenchkris thank you 👍🏼

[@gabrielochoa9261]

Mucha informacion muy baliosa pedro grasias x conpartir me a ayudado mucho Dios te vendiga y saludos a mi chavo y feliz navidad

[@CarlosDieselElectric]

@@gabrielochoa9261 gracias. Feliz Navidad

[@gabrielochoa9261]

Carlos buenas tardes como le va una pregunta tengo el codigo 4374 fmi4 pump speed signal below le ise la prueba de de los 130 mlitros y la paso cual es el siguiente paso ...grasias se lo agradesco

[@CarlosDieselElectric]

@@gabrielochoa9261 ya probó ADS self check?

[@govinlama2731]

❤❤❤

[@khalidw5166]

Thanks brother for sharing I have a question please, after you install the pump do you need to prime it? Thanks again and keep up the good work

[@CarlosDieselElectric]

@@khalidw5166 great question. You don’t need to prime but you do need to prove to the system the fault has been fixed in order to clear the codes. Performing the SCR ADS self check it proves to the system the DEF issues has been solved and the codes should clear.

[@trumpchange]

Thanks for sharing! Are you using the Dealer Level or Standard Diagnostic Link Software?

[@christopherrobin318]

He has the standard version. It says so in the top left corner.

[@CarlosDieselElectric]

@@trumpchange standard version does 90% of what most people need. The professional version allows for MCM, ACM, CPC and TCM updates. Standard works well for us.

[@trumpchange]

@CarlosDieselElectric Thank you. I'm using Diesel Laptops now but have been looking in to purchasing the actual Detroit Software. From what I can see in your videos, it can do alot more and let's you see alot more of the live data as well.

[@jorgefacio690]

mine sounds like that when i crank it minus the steam train noise. my volt meter shows 14.1 or 14.2. should i do a compression tests on it? 577847 on the miles