I work at an auto shop, my boss drives an 01 Cummins auto, he has the in-tank retrofit, along with the stock lift pump on the block running, The last few days he says the trucks been starting hard (start and stall), and he says the fuel pressure is way lower than it should be, I replaced the lift pump today, and I noticed that when I revved it up cold there was a ton of white smoke, changed the pump, it ran good, good FP, just fired it up to replace the filter, and now its done, The lift pumps will not run when the key is bumped, will not start, all fuses good, and dont have any power to the lift pump. Have a code in the PCM P1694: No bus messages recieved from engine, and P0123, TPS voltage high, They come back immediatly after clearing, and I cannot communicate with the ECM, but can with the PCM, I have checked the ECM connector and its good and I have a good ground, Does it sound like a dead ECM?

 

How were you powering the lift pumps?

 

http://www.canobd2.com/DtcLibrary/De...odge&Dtc=P1694
p1694....No CCD message from PCM- Aisin transmission

 

There is a tool by Cummins that will allow the VP44 to run without ECM. If engine runs with tool then ECM may be toast. If no run than VP44 is toast. The code could also be result of VP44 locking down the ECM. JMHO

 

i ran my truck out of fuel one time and it wouldnt start for nothing and had no fire to the lift pump.....turned out the ecm has shut off the pumps so that it wouldnd burn up the vp....as soon as i cleared the codes i had fire again....!i cant remember what codes i had)then we bled the injectors and she fired right up....we tried different things for hours and finally decided to clear the codes.....id definitely try to clear the codes first and see what happens hope that helps! just my .02