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No Start...Determined to get er running


BLWN420

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Hello All.  Thanks in advance for any input.  I can even handle take it to a professional comments but I just don't give up easy.  I'm new to the diesel world for just a year now.  I have a 2008 dodge 6.7 for myself but the truck I am working on is my girlfriends 2007 dodge 5.9 4 x 4 four door 3500.  She was hauling a light load and it starting running rough and died.  Restarted and ran fine then 30 minutes later it died and hasn't started since.  Since boyfriend duties require me to try here I am in this pickle.  Now for what I've done.  tested lift pump output, injection pump output, injector return flow, and verified fuel psi vs fuel setpoint while cranking and all seems perfect.  Will not start with minor shot of starting fluid but sounds like it tries.  I've unhook fan wiring still no start.  But here's the weird part to me.  I unhooked the crank sensor and it started.  Ran horrible, missing and knocking so I shut it off immediately.  Done the cps circuit test and everything ohms as it should.  Replaced the sensor just because it wasn't too costly.  Done the same circuit testing for the camshaft sensor which is identical as the crank sensor on this truck.  I'm thinking I have an electrical short or bad ecm but wanted some wiser than myself input.  One thing that doesn't seem right to me is if I pull the ecm fuse I actually have 12 plus volts on both sides of the terminals.  The hot side has about 1/2 volt more than what I would call the load side.  May not mean anything but when I pulled that same fuse on my 2008 I just had battery voltage on hot side and nothing on the load side.  So what do you think I should test or try next?

 

 

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Codes????  Miles on truck?????  Any modifications?????

Only codes that appeared is when I unhooked the crank and cam sensors while cranking and had the fan unplugged.  po341..po480..  Can clear them and try to restart when plugged back in and they don't show up so I think codes came on just because I had them unhooked.  No mods except I think the engine brake was a dealer add on.  It has the push pull switch on the steering wheel.  180,000 miles on odometer.  Little more new info I removed the front ecm plug from ecm and still have the voltage feedback on fuse prong that is load side.  I then removed the back ecm plug closest to firewall and then I have no more volts on that load side fuse prong.  Hope that makes sense to what I tried there. 

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Codes????  Miles on truck?????  Any modifications?????

Good grief I meant push/pull switch on automatic trans.shifter not steering wheel. I don't think it came like that but may have.  She bought truck new one owner truck.

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