Question about Hyundai Motor 2003 Sonata

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03 hyundai sonata camshaft postiton sensor circuit malfunction

We had just replaced our alternator in our car and when we got it up and running again i noticed that it just wasn't driving right about 2 days later my car broke down. Our friend came over and hooked up the computer to our car and it came up that we had a camshaft sensor circuit malfunction. We tried a good camshaft sensor in it and still got nothing. Im not sure were to start looking to fix my car. I've had horrible luck with mechanics on my car so I'm not sure if this is one of those things we could be able to fix ourselves or if we should just take it to a mechanic. Do you have any suggestions on what else i could check to maybe get this problem fixed?

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  • Anonymous Feb 18, 2009

    I had my timing belt replaced recently and when I picked it up from the mechanic, it wasn't running smoothly at all. The mechanic insisted that the shaking and hard idle would go away with time. When a month later it broke down again, like yours, showing a camshaft positioning sensor problem. After that was completed the car still idled very rough and would stall out as soon as it heated up. I founf out that when the first mechanic fixed my car, he didn't notice that the camshaft was broken by the timing belt and he also didn't replace the balance belt properly which was causing that idle that he ensured would go away.

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Take it to a dealer, cheaper in the long run that going to "just any mechanic"

Posted on Jul 24, 2009

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Code p0340


P0340 Hyundai - Camshaft Position Sensor 'A' Circuit Malfunction Bank 1 Or Single Sensor Possible causes
- Faulty Camshaft Position Sensor
- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery

Read more: http://engine-codes.com/p0340_hyundai.html#ixzz338zFujgZ

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Error code po340 for a 2002 hyundai elantra


Here is what I could find on your P0340 error code:
CausesA code P0340 could mean one or more of the following has happened:
  • a wire or connector in the circuit could be grounded/shorted/broken
  • the camshaft position sensor may have failed
  • the PCM may have failed
  • there exists an open circuit
  • the crankshaft position sensor may have failed
Possible SolutionsWith a P0340 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
  • Visually inspect all the wiring and connectors in the circuit
  • Check for continuity in the circuit wiring
  • Check the operation (voltage) of the camshaft position sensor
  • Replace the camshaft position sensor as required
  • Check the crankshaft position circuit as well
  • Replace circuit wiring and/or connectors as required
  • Diagnose/replace the PCM as required
Sounds like since you have replaced both the camshaft and crank shaft sensors you need to look at the PCM.  Go down the line of possible solutions and don't replace the PCM unless nothing else works obviously.  I hope this helps but it looks like you are looking at getting a new PCM.  Good luck.  Thanks for rating my response and for using FixYa!

May 27, 2009 | Hyundai Motor 2002 Elantra

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