Question about Hyundai Motor 2004 Sonata

2 Answers

Error code P0350

Hello,
I have a 2004 sonata with 108K miles. The car started missing and the engine light came on. The car missing and has no power,
I borrowed a code tester and found four codes. P0300, P0302, P0303, and P0350. I tested and found that the coil for cyls 2 and 3 did not have the required 20K resistance between the two outputs. I replaced the coil and during the test drive all seemed well for about ten miles when the missing and loss of power returned.
The engine light came back on only showing code P0350.
I check both connectors for the coils, and found proper voltage and ground. I also replaced the spark plugs and visually inspected all wires and connections in the engine compartment.
Any ideas as to what to look for now?

Thanks in advance,
Darrell

Posted by on

  • dbk4297 May 22, 2008

    Hi,
    Thanks for the response.
    I have checked all that you list above. I see the same info you list at the Hyundai sitehttp://www.hyundaitechinfo.com/ .
    I'm down to the last portion "Substitute with a known - good PCM and check for proper operation."

    The only way I can do this is to buy a used or rebuilt PCM.
    Another problem for me is locating the PCM. I understand the it might be located below the radio. For the life of me I can't figure out what to remove or how to remove the center console to even check.

    Darrell


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I had a very similar problem. Assuming you have the 4 cylinder engine, the long wire to #1 spark plug invariably rests against the mounting bolt for the #2 & #3 cylinder ignition coil. If the wire is resting against the bolt it is intermittently (at best) arcing. I put a short section of corrugated wiring jacket around the spark plug at that point to hold it off the bolt. Fixed the problem.

SJH69

Posted on Feb 18, 2009

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P0350 Ignition Coil Primary/Sensor Circuit If there is no voltage at either of 2 ignition coil group during 32 ignitions, the PCM determines that a fault exists and a DTC is stored.. http://hmaservice.com/viewer/dispimg.asp?path=/data/Passenger/HY/HMA/ENG/DTC-images/HY-EF13-IMAGES-ENG/ef24035011.jpg

Posted on May 22, 2008

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  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos May 22, 2008




    1.

    Check Spark Plug Cable



    (1)

    Visually/physically inspect the following items:



    A.

    Damage, cracks and flashover



    (2)

    Measure the resistance of the spark plug cable
    Specification : 5.6kΩ/m ± 20% at 20°C(68°F)



    (3)

    Is the measured resistance within specifications ?
    YES
    ▶ Go to "Check Spark Plug" as below.
    NO
    ▶ Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.



    2.

    Check Spark Plug



    (1)

    Ignition "OFF"



    (2)

    Disconnect Spark Plug Cable and remove Spark Plug.



    (3)

    Measure Spark Plug Gap using a wire gap gauge.
    Specification : 1.0 ~1.1mm (0.039 ~ 0.043inch)



    (4)

    Is the measured resistance within specifications ?
    YES
    ▶ Go to "Check Ignition Coil" as below.
    NO
    ▶ Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.



    3.

    Check Ignition Coil



    (1)

    Ignition "OFF"



    (2)

    Disconnect Ignition Coil connector.



    (3)

    Measure the secondary coil resistance between the high-voltage terminals of the ignition coil.
    Specification : Approx. 20kΩ ± 15% (20°C(68°F))




    (4)

    Is the measured resistance within specifications ?
    YES
    ▶ Substitute with a known - good PCM and check for proper operation.
    ▶ If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
    NO
    ▶ Substitute with a known - good Ignition Coil and check for proper operation.
    ▶ If the problem is corrected, replace Ignition Coil and go to "Verification of Vehicle Repair"procedure.

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos May 22, 2008






    1. 3.

      Check Ignition Coil



      (1)

      Ignition "OFF"



      (2)

      Disconnect Ignition Coil connector.



      (3)

      Measure the secondary coil resistance between the high-voltage terminals of the ignition coil.
      Specification : Approx. 20kΩ ± 15% (20°C(68°F))

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos May 22, 2008

    P0300 = Random/multiple Cylinder Misfire Detected------

    P0302 = Cylinder 2-Misfire Detected------

    P0303 = Cylinder 3-Misfire Detected

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The problem turned out to be the second coil. The first coil I tested was bad and replaced, but the second coil tested good using the pages at the Hyundai pages. Once I broke down and took the car to the shop they replaced the second coil that tested 'bad' on their computer testing. The cost was less than $200 and the car now runs like new again at about 150K miles.

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