Ktmjonny

Is there anyone out there doing repairs on dodge/cummins ECM's? I have low voltage to the lift pump, truck won't run. Any suggestions?

Busboy

If that's the only problem just run 12 volts from an ignition source, on and off with the key.

Ktmjonny

I thought about that but when I powered the pump, I could only get fuel out of injectors 4&5. I have 15 psi going to vp44. Thinking ECM is possible problem with injectors too. Hoping vp is not toasted.

cdennyb

I'm curious if you measured the voltage or just got a code that said you had low voltage. I had low volts at pump code awhile back and it was the pump that was going into overload and drawing too much current which lowered the voltage and tripped the code I guess. I dumped the stock pump and went with aftermarket Holleys under the frame rails and had no issues after that. Just a thought.
Don't explain the lack of fuel at the injectors though and it should start and run fine with a solid 12v to the pump and that kind of pressure, regardless. If the ECM was to blame for the injectors as well then I would expect a lot more codes to pop up. Did you have more codes?

Ktmjonny

I did measure the voltage at the pump 8.8v. I replaced the pump with a raptor also have no codes.