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I need diagnostic help for code ppid 277 fmi 14 on a 2012 mack mrun Mru 613*

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Answered in 1 minute by:
12/15/2020
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 1 year ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,427
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
Hello and thank you for using Just Answer. My name is ***** ***** I’d like to try and help. I am sorry that you are having issues with your truck. I know this can be frustrating. Please allow me a few moments to look over your question and I will be right back with you. Thank you
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Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 1 year ago
On this fault there are a few different possibilities. You will need to run the def doser pump test to make sure the pump is able to build 130 psi and maintain it. Also will need to make sure it build it in a timely manner. If it does then run a regen while monitoring pressure and make sure that the def pump pressure is not dipping too low when it is dosing. 10-12 psi is the norm as the doser is pulsing. If you have low def pump pressure then check the inlet fitting on the pump. Remove the fitting and pull the prescreen and make sure it is not plugged. Check the connections on the def pump and make sure def is not pushing out thru the connector. Please let me know if you have any follow up questions on this. Thank you
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Customer reply replied 1 year ago
I send you a reply in the text message. Does that not work?I performed the def pump pressure test as well as the 120 second dosing test and they both passed. What does the code mean with a definition of ACM Air pressure? Thank you
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 1 year ago

Where are you seeing the definition of ACM air pressure? Have you ran the def volume test as well. What all measurements were you able to get?

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Customer reply replied 1 year ago
Can I not answer you with the text?
Customer reply replied 1 year ago
When I look up the code ppid 277 with my scan tool, that is what code it gives me.
Customer reply replied 1 year ago
I did perform the 120 second test and got 240 g and the 2 second test and got .02 gCan you just send me a copy of the troubleshooting tree for this code?
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 1 year ago
There is no ACM air pressure. Sometimes these aftermarket scan tools do not get code descriptions right. All of the diagnostics trees are all imbedded in ptt program and the steps on them are laid out above in my response earlier. The only other step that is on this tree is to check for acm and eecu software updates
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Customer reply replied 1 year ago
Ok, so what is the code for?Can you tell me the most recent software revision so I can see if my eecu and acm are up to date?
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 1 year ago
The fault is for def pump drive percentage. The revisions are always changing so I do not have it recorded. We just check for the update and tech tool will tell us
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Customer reply replied 1 year ago
is the code ppid 277 an son 4375?
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 1 year ago

Yes, The SPN faults are translated as such

Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,427
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
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Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
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