Where is everyone #5

I'm not up to speed on Cummins since they aren't common in the stuff I usually work on. Typically you'll want to back probe the sensor and take voltage measurements. With that laptop you should be able to read the rail pressure.

I will advise against running the engine excessively. On a lot of common rail fuel systems when the ECM can't see certain parameters it maxes out the injection pump displacement, which trips the relief valve in the rail and dumps everything to the return.

Those relief valves get gradually weaker each time they are tripped and the manufacturer usually has a max number of times they can be tripped before replacement is required. Usually the ECM keeps track of that number so you might be able to see it on the laptop.

 

One thing i am seeing in the data of the fault code is
fuel rail pressure commanded=5527psi
right below it
fuel rail pressure measured=25974 psi.. seems a bit abnormal? Could that be related? Ill have to dig a bit deeper into the software tonight and see if i can find some more. As far as i know the relief valve has never been changed on the fuel rail.

 

Did the commanded and actual values change as you increased the RPM?

Like I said I am not overly knowledgeable about Cummins but generally speaking actual and commanded should usually be pretty close.

 

Not sure didnt see it while running only noticed it when i was going thru it after engine turned off. Ill do some research tonight and dive deeper into it tomorrow

 

Atleast we got some chicken lights again ! What else does a guy need..

 

I don't think it would cause this on this engine, but just for S&G's i'd make certain no wires got missed when you swapped batteries.

The requested and delivered #'s may be default #'s, not actual

 

That's a good point. I didn't realize it wasn't running when those numbers came up. That would make sense that it would be commanding high pressure while the actual could just be what was residual in the rail after running.

 

Not that this would help at all but i did get a short video of it idling smooth and then right after i raised rpms to about 900 for a minute or so then brought it back to idle. it started surging and misfiring.

 

Fuel rail PRV? FCA? My Cummins guy said check that. I'm not a Cummins guy, best I could do.