Question about Hyundai Sonata

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04 sonata 123000 miles rough shifting surging code po123 tp sensor checked % all out of whack changed the sensor would not go into gear ran rough went back to old sensor values were fine car works perfect got to be something wrong?

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  • robert boyle Aug 23, 2010

    hi, i believe i can do that with a scanner? but my problem is i put a new sensor on and its values were perfect but the car ran terrible and would not go into gear so i put the old sensor back on now the values of the old sensor were fine and the car works fine why would the values of the old sensor go back to normal and the car begin to work normal ? also cel lite did not come back on.

  • robert boyle Aug 24, 2010

    2004 hyundai sonata 2.7 car began surging w/ harsh shifts code po123 tps checked %w/ scanner they were all over the map so i changed tps car would not go into gear and ran rough went back to old sensor car worked fine for one day overnight it sat started next day would not move went back to new sensor it worked fine for another day next day it would not move again and ran rough warm it up now it works fine anyone have any ideas

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2 Answers

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  • Master
  • 1,796 Answers

Hi!!

Have you try moving the throttle by hand to see if it is sticky??

Another thing that can make the TPS act crayzy is the IAC solenoid.
Unplug electrical connector and remove the two IAC fastening screws, remove IAC solenoid, using a rag wet with fuel injector fluid, wipe the solenoid body clean. wrap the rag around a pen or pencil, spray some cleaner and insert it into the solenoid's housing, make sure to wipe clean the far end, where the solenoid sits. Make sure not to scratch the housing walls. DO NOT SPRAY FUEL INJECTOR CLEANER STRAIGHT INTO SOLENOID BODY OR HOUSING.

Retract solenoid by grabbing it by the cup and turn back and forth while you push in. Do not push too hard. Reinstall solenoid and fastening screws, Plug electrical connector. Start vehicle.

The building of carbon on the seat and tip of the solenoid will prevent it to have a tight seal, therefore a rough idle and a problem shifting.

Keep me posted!! Don't forget to rate this post!

Posted on Aug 24, 2010

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  • Hyundai Expert
  • 1,868 Answers

Hello! Lets check the TPS with a volt meter...Using two safety pins...Push one pin into the rear of the in-place connector on connector pin #2...the other into pin #3...Set meter to read 5 volts...Place + meter probe on pin #3...The - probe on pin #2...Start engine...At idle, meter must read less than 1 volt (.85)...Slowly increase throttle to full...meter must read 4 volts...The issue is this; Voltage must rise smoothly as rpm's increase...If the voltage jumps, skips or acts erratic the TPS is defective...Send results...This test establishes a starting point....Guru............Saailer

Posted on Aug 22, 2010

  • 32 more comments 
  • David Burbee
    David Burbee Aug 23, 2010

    Hello! The scanner isn't the way to discover if a TPS sensor is truly defective...If you can, take the voltage readings and send results...I'll be able to explain the problem with these readings...Saailer

  • robert boyle Aug 23, 2010

    hi just got back to this car,can this be accomplished with a digital multimeter that cannot be set to 5volts?

  • robert boyle Aug 23, 2010

    hi just got back to this car,can this be accomplished with a digital multimeter that cannot be set to 5volts?

  • robert boyle Aug 23, 2010

    hi just got back to this car,can this be accomplished with a digital multimeter that cannot be set to 5volts?

  • robert boyle Aug 23, 2010

    hi just got back to this car,can this be accomplished with a digital multimeter that cannot be set to 5volts?

  • robert boyle Aug 23, 2010

    hi just got back to this car,can this be accomplished with a digital multimeter that cannot be set to 5volts?

  • robert boyle Aug 23, 2010

    hi just got back to this car,can this be accomplished with a digital multimeter that cannot be set to 5volts?

  • robert boyle Aug 23, 2010

    hi tested it with multi meter in ohms they move up and down smooth with the throttle,

  • David Burbee
    David Burbee Aug 24, 2010

    Hello! The test I sent is done with your meter set on 5 volts...It has to be tested under power...Not using the ohm scale...Give it a shot and we'll see what we have...Saailer

  • robert boyle Aug 24, 2010

    saailer give me a shout if your out there

  • David Burbee
    David Burbee Aug 24, 2010

    Hello! I am here!.........Saailer

  • robert boyle Aug 24, 2010

    saailer a new tps has been installed cannot get any ohm reading to adjust can this problem be a app sensor thanks bb

  • David Burbee
    David Burbee Aug 24, 2010

    Hello! Throttle Positioning Sensors are not adjustable...The sensor is bolted to the throttle body and merely plugged in...The sensor is only tested with a volt meter set on the 5 volt scale...Resistance measurements (ohm's) is not used...Lets start this from the beginning...Have you connected the volt meter as described in the procedure? I'll stay connected to you now and will bring your problem to a happy ending...Reply to me ............Saailer

  • robert boyle Aug 24, 2010

    saailer i have a multi meter i dont believe i can set it to 5volts

  • robert boyle Aug 24, 2010

    saailer are you there

  • David Burbee
    David Burbee Aug 24, 2010

    Hello! And that's OK...All we need to see is less than 1 volt at idle for first reading...Hook up the meter...Start the engine...Send me the reading...We will go one step at a time..Saailer

  • David Burbee
    David Burbee Aug 24, 2010

    Hello! Here are the wire colors of tps...White...Orange...And Yellow Orange...Safety pins into the White and the Orange...Connect + probe of meter to the White wire...And - probe to the Orange...Saailer

  • robert boyle Aug 24, 2010

    saailer my multi meter reads .475up to .675 it moves smooth with the throttle and it is brand new

  • robert boyle Aug 24, 2010

    did you get my last reply

  • David Burbee
    David Burbee Aug 24, 2010

    Hello! So, at idle the meter reads .475? This is important...Tell me the exact reading at idle..Saailer

  • robert boyle Aug 24, 2010

    now it is .411

  • David Burbee
    David Burbee Aug 24, 2010

    Yes I did...But i did not quite understand...I'm looking for a single reading at idle...Then we'll run the test...Stick with me we are close to a fix...Saailer

  • David Burbee
    David Burbee Aug 24, 2010

    OK...Thanks...The .411 at idle is telling me that the TPS, OR the connected wires are defective...normal reading should be .85 volts...To solve...As you increase the idle to full throttle send the maximum reading...Must be 4 volts....saailer

  • robert boyle Aug 24, 2010

    the multimeter reads .411

  • David Burbee
    David Burbee Aug 24, 2010

    I just received an e-mail without a comment ...system does this from time to time try it again...Saailer

  • David Burbee
    David Burbee Aug 24, 2010

    BB...Are you there? Saailer

  • robert boyle Aug 24, 2010

    yes saailer my multimeter does not read in single digits it reads 12.5 on the battery but .411 on the tps there is a new sensor on it but matbe it is bad also or i have a wiring problem?

  • David Burbee
    David Burbee Aug 24, 2010

    Your Ok...Your vehicle runs on 12 volts...But electronic sensors run on 5 volts...Just set your meter on a scale that allows you to read 5 volts...If you have a 10 volt scale that would be fine...At idle your seeing .411 (that's a bad tps , wiring to the tps or bad 5 volt supply)...Were very close to a solution...Watch the meter and tell me what it reads at full throttle...Saailer

  • robert boyle Aug 24, 2010

    saailer are you there

  • David Burbee
    David Burbee Aug 24, 2010

    BB...Send your comment again.................Saailer

  • David Burbee
    David Burbee Aug 24, 2010

    BB...Tell me the make and model of the multimeter you are using...This would allow me to see the choice of scales...Saailer

  • David Burbee
    David Burbee Aug 24, 2010

    BB...THERE IS AN ERROR IN THE REPAIR MANUAL WIRING DIAGRAM...


    The wiring color codes are incorrect in one of the repair manuals...First of all is the vehicle equipped with the 2.4L or the 2.7L?...I'll give them both to make sure...

    TPS for 2.4L= Light Blue/Black...Blue...And Black/Orange....Safety pin Blue (+ meter )...And Black/Orange (- meter)

    TPS for 2.7L=Black/Orange...Blue...And Green/Orange...Safety pin Blue (+ meter)...And Black/Orange (- meter)...

    Repair manual errors are a reality...Maybe you are on the TPS, But the wiring colors that I first gave you are wrong...THESE ARE CORRECT...I can't apologize for the repair manual...But stick with me...Run the test again.........................Saailer

  • robert boyle Aug 24, 2010

    if i prob #3 w/ and #2w/- with plug off i get 4.85volts put plug and and safety pins in i get nothing tried for an hour no reading with the plug on

  • David Burbee
    David Burbee Aug 24, 2010

    BB...The last comment is telling us that the TPS that is installed is defective...If I understand this ...The Vehicle runs OK? Or not? This is the original TPS...Re- install the new one repeat the idle reading...To be absolutely correct...Tell me the color of the three wires on the plug...Saailer

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