Question about 2005 Hyundai Sonata

5 Answers

I have a 2005 Hyundai Sonata and it will not start. i disconnected the fuel line and tested--fuel pump is good. I have power to the coils, but no power coming out of the coils. is it possible all the coils failed at once? There looks to be a little relay below the coils, could this be the problem? The car turns over fine--and once in a while it will start for a short bit then dies. I am very confused!!!

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  • 6 more comments 
  • meandmytoyz Mar 18, 2011

    How do i test it?

  • meandmytoyz Mar 18, 2011

    How do I test this??

  • meandmytoyz Mar 18, 2011

    Can i have more information, when I look online it says that an ignition modual is not available for this vehicle

  • meandmytoyz Mar 18, 2011

    I understand these might be some options, but why is there no power coming out of the coils? Should I start with the coils?

  • meandmytoyz Mar 18, 2011

    We checked and there are no codes, i have the GLS model with the V-6

  • meandmytoyz Mar 18, 2011

    By checking for spark, we checked for power to the coils ( which we had power) and there was no spark out of them.

  • meandmytoyz Mar 18, 2011

    So if I have power to the coil then both of them should be working right?

  • meandmytoyz Mar 18, 2011

    Still looking for a solution..

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5 Answers

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  • Hyundai Master
  • 17,129 Answers

As you have a confirmation of the HT failure it is important to confirm that the coils or the LT triggers to the coils are present.
The ignition system can be checked quite easily as the engine is cranked there must be a make and break( DC switching) on the coils) If this is not present the ignition system needs a check right from the sensor side . If not the HT coils or the HT wires are to be checked. Make sure that the plugs were taken out cleaned and set back as it seems to be working alright.
Please check this link below for some tips:

http://www.buzzle.com/articles/bad-ignition-coil-symptoms.html

Posted on Mar 19, 2011

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  • Hyundai Master
  • 8,128 Answers

Hi, that little thing you're calling a relay is actually the condenser; and yes, it could be the cause. Go ahead and unhook the condenser. All it does is reduce static on the radio, but if it fails it will affect the voltage to the coils. If disconnecting the condenser allows the engine to run, just replace the condenser so your radio will not have static.
Now, if this doesn't work, the problem may be with the crank sensor or the security system. Is there a security light on the dash? Is it blinking? Is your check engine light staying on after the bulb check?

I have a 2005 Hyundai Sonata and it will not - jturcotte_1268.gif

Posted on Mar 18, 2011

  • Jeff Turcotte
    Jeff Turcotte Mar 18, 2011

    Hi, please let me explain how the coil works. Power to the primary coil inside must be interrupted to produce a spark in the secondary coil. This is accomplished by the computer, which produces a square wave to the negative terminal of the coil based on input from the crankshaft position sensor. So, to produce sparks, the computer must get a signal from the crank sensor and use it to produce and deliver a square wave to the coil. This is likely where you problem is. If the condenser is shorted, it can also draw down power to the coils and reduce the spark intensity severely. So, I do recommend you disconnect the condenser first, and if that doesn't work, I have to wonder about the crank sensor. Sometimes the computer will recognize a problem with the sensor and set the malfunction light, but not always. If you engine light is on, I recommend you get the car scanned to see what the trouble code is. This will provide some help in diagnosis. If the light is not on, I would go ahead and check the sensor. I have listed some test procedures below. These require the use of a meter and access to the engine's computer. The computer is inside the right pillar to the right of the passenger's legs. You will have to remove the console side cover to access the computer (see ECU in picture below). A new sensor is $60, so it's worth the effort to run a few tests before buying one, if you have some equipment to run the tests. The sensor is on the driver's side of the engine as shown in the picture below. If the sensor fails the resistance tests, replace it. Please let me know if you have more questions.






    2.7L Engine, crankshaft position sensor tests:

    To check the signal voltage, turn the ignition switch to the OFF position.
    Disconnect the ECM connector.
    Measure the resistance between terminal 2 of the sensor harness connector and terminal 8 of the ECM harness connector (C133-3).
    Measure the resistance between terminal 3 of the sensor harness connector and terminal 21 of the ECM harness connector (C133-3).
    Specification should be below 1 ohm.
    If not, replace the sensor.


    Be sure that the CKPS and PCM connectors are connected.
    Set up an oscilloscope as follows: Channel A (+): terminal 2 of the CKPS, (-): ground. Channel B (+): terminal 2 of the CMPS, (-): ground.
    Start the engine and check for signal waveform (whether synchronize with camshaft sensor or not and tooth is missing).
    Readings are as follows: The square wave signal should be smooth and without distortion.
    Readings are as follows: The CMPS falling (rising) edge should coincide with 3-5 tooth of the CKP from one longer signal (missing tooth).
    If the waveform signal is normal, check for poor connection between the PCM and the components.
    If the waveform signal is not normal, remove the sensor and calculate the air gap between the sensor and the flywheel/torque converter.
    Air gap is 0.012-0.067 inch. Measure from the distance of the housing to teeth on the flywheel/torque converter (measurement -A-) and from the mounting surface on the sensor to sensor tip (measurement -B-), then subtract -B- from -A-.
    Check the sensor for contamination, deterioration or damage.
    Substitute the sensor with a known good component, check for proper operation. If problem corrected replace the sensor.

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  • Master
  • 2,926 Answers

Do not start with the coils just yet. The most important info left out of this post is "what size engine do you have"? I think the reason for a non start, but power to the coils is the CKP (crankshaft position sensor). The coil activation is controlled by the PCM when info from the CKP is applied. For you to test this sensor would require a scope that I'm sure you most likely do not have. With that being said, Have you checked for trouble codes stored in the PCM? If so, what codes are stored. Let me know.

Posted on Mar 18, 2011

  • GetMeOttaHere Mar 18, 2011

    How are you testing for no power coming out of the coils during start up? I'm curious.

  • GetMeOttaHere Mar 19, 2011

    No, but you have already rated the post as still unsolved.

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  • Hyundai Master
  • 1,940 Answers

  1. Since you have verified that you are getting fuel, this is probably an ignition fault, but since it does start sometimes you may have faulty injectors or wiring, or fuel pressure regulator.
  2. You are more likely to have a bad Camshaft Position Sensor. When not replaced, vehicle could experience no or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown.
  3. It is possible that 2 or more coils have gone bad, causing your engine to not start, but sometimes start for a short while.
  4. Although less likely to be the problem, you may have a faulty ignition switch, or even a faulty ECM.

Posted on Mar 18, 2011

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  • Master
  • 750 Answers

CHECK THE IGNITION MODULE BELOW THE COIL PACK.











TIM

Posted on Mar 18, 2011

  • timothy hester
    timothy hester Mar 18, 2011

    ever vechicle has a ignition module,some might be called ignighters,check the module by unpluging coil and see if you have power coming out if not module is bad.

























    TIM

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2) When you crank the car do you see spark coming at the spark plug? if no then its time to check the spark plugs and coil pack.if the spark plugs are not worn out and looks new then its time to check coil pack.the spark plugs gets power to spark from coil pack.
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