drove truck to work today and every thing was ok. but when i I was letting it cool down it was missing ,then after work it will not start .it is not getting any fuel at all when it is turning over , i have good fuel pressure to the cp3 ,i un pluged all boxes and it still will not start .any ideas? codes are p0336,p0647(tst caused this ),p1652j1850(tihis one looks bad),p0602 thanks!!!!!!

 

The first thing to check on the 03 is the wire that leads from the AC sensor back around the engine. It rubs the insulation off and will ground out the fuel injection.

If that is not it, then check the fuel rail pressure relief valve. It gets leaky and will keep the rail from pressurizing. Symptoms are generally lousy performance, hard starting for some time, and a rough idle before it fails to start.

The A/C error (647) in combination with the ECM fueling calibration error (602) would lead me to check the A/C sensor first.

However, your problems could also be from corroded terminals at various places if some moron has been using a pressure washer on the engine. That is an absolute do not do on the Cummins diesels since 1998.5. If this has been the case correction can easily run hours and hours to diagnose and correct.

 

man thanks alot for teh info !!! when you say ac sensor do you mean the wires from the compressor ?

 

still broke down . it will start if i use ether but it misses real bad so i un-pluged the injectors two at a time (the only way you can do it ) and the miss did not change much when i un-pluged the middle injector harness .any ideas guys ? please help!!!!

 

OMG, don't use ether! The ether flows right past your heating grid. They can get hot enough to ignite your ether and launch your intake manifold.... ouch.

 

i know i un hooked the grid ,any help guys ? ideas?

 

The wiring he was talking about is at the a/c pressure transducer. Here is a pic of it's location. Look at the wiring very closely. Between that and the crank sensor code, I think that's the direction I would look towards first. The j1850 circuit shorted to ground would be an indicator of the same problem.