Chrysler Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.Yhe signal out of the Crankshaft senor should be a a 5 volt square wave. Are you loosing spark as well as injector pulse?
If you are lacking spark as well as injector pulse and you getting a good 5 volt square wave pattern from the CKP sensor and the circuit from it to the computer checks okay then you are likely looking at a problem with the computer. I would start with making sure you have power and ground to the computer (PCM ) and reference voltage out of it .See the steps to do this in the link below, copy and paste the link to your browser to open and view them.https://dl.dropboxusercontent.com/u/104923897/PCM%20test%20Sept%2016.pdf
It should be a square wave pattern while cranking. Check the test steps I sent you and if you are sure the new sensor is okay then the problem is likely with your PCM.
Not its not acceptable, you should be seeing a 5v square wave. If you are getting 8 to 9 volts it is excessive.
Im not sure , are you replacing it with a OEM factory sensor?
Its not likely that they all keep failing , I wonder if you have a problem with the circuit from it to the PCM, have you checked the wiring from it to the PCM?
That would indicate you have a bad bad ECM but you say you have replaced it, if that is the cases Im not sure how to advise you , Im afraid there is not much more I can do from here . I can relist the question for you in hopes fresh eyes will have some new ideas if you would like.
Doing so now. If someone can help they will respond.