I have a Dakota 4.7 that is not starting! Code im geting is P0340. About a week ago it gave me the same problem & wouldnt start. Changed my crank sensor & it fired right up. Drove for about a week & now its doing it again! Went & got another sensor, swapped it out and still nothing. The connection at the sensor seems fine. Could it be the wiring harness?? Im stuck & could really use some help!!
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I doubt there's one... plus it would just be as much work as checking your own.
Basically, Dan has already identified that your crank sensor is on a 5V circuit. You will want to check that you're getting the right amout of power to your sensor and signal from your pcm.
Since you said it ran great for a week with the new crank sensor... I'm willing to bet your male end of the harness (one on your engine) is corroded or has a short. This would explain why it just doesn't start anymore.
Google how to test a crank sensor with a multimeter. Does a much better job explaining it than I do Lol. Not very complicated.
Last edited by sxrsil3nt; 09-23-2013 at 02:10 PM..