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Hello this is a second question for a truck you helped out with last week . 2004 mack cv713 with a ai 427 getting a code for #5 sid 5 FMI 8 code . Did a cylinder shut down , and #3 and #4 do not sound like they are working . I have checked fuel pressure at the temp sensor port 55-65 . Pulled #5 eup and the rod was extended far enough that the retainer and spring were not under any tension.
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Answered in 8 hours by:
5/14/2022
Technician: Wayne, Journeyman replied 3 months ago
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 17,642
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified

Hi, I'm Wayne.

I'll be assisting you with this issue today.

Thank you for coming to Just Answer

Your Question is as important to us as it is to you.

I am sorry to hear you are having this issue.

I go offline at 3 pm CST. M-F

Weekend 2 pm CST for the day

On the sid 5 fault, you will want to check the connections on #5 eup. Make sure the wiring is not rubbing on the heat shield. Then compare the resistance to the surrounding eups to see if it is an issue in the harness or a bad eup itself.

I think you have a faulty harness.

I hope this helps you.

Wayne

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Customer reply replied 3 months ago
Do you have a pin out diagram for the ecm and the EUPs?
Technician: Wayne, Journeyman replied 3 months ago

Hi,

Thank you for the response

I am offline for the day but do check-in.

Let me check if I do have ECM pinout?

HI,

This should help you.

May want to save to a file.

https://www.macktrucks.com/-/media/files/body-builder/wiring-diagrams/mack-gen2-23086355_03_1.pdf

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Customer reply replied 2 months ago
Not sure if this is the right diagrams, this truck is an 04 and I don't see any EUP's in the diagrams
Technician: Wayne, Journeyman replied 2 months ago
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Customer reply replied 2 months ago
Hey Wayne I do not see anything to do with the engine ecu or EUPs on these diagramsThey do have urea and doser diagrams which is way later than what I need but either way there is no engine ecu in theseI have it pulled up on Mitchell but rather use mack diagrams
Technician: Wayne, Journeyman replied 2 months ago

Hi,

That is all I had, sorry.

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Customer reply replied 2 months ago
Wayne on this mack, all the EUPs have steady fuel flow when you crack the line except for number 4 which is like air and foam. We swapped EUPs and it stays on 4 which is where the return is, any ideas??
Technician: Wayne, Journeyman replied 2 months ago

Morning,

Not really, on more ideas.

Open another quesond 2nd opinion,it is free, ask for Steve, he works at a Mack Dealer.

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Customer reply replied 2 months ago
Ok will do, do I just ask for Steve in the question?
Technician: Wayne, Journeyman replied 2 months ago
Hi,

Yes, that is correct.

Sorry I could not help anymore.

Wayne

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Customer reply replied 2 months ago
Thanks Wayne
Technician: Wayne, Journeyman replied 2 months ago
Welcome.........
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 17,642
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified
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Wayne
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Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 17,642
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Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

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