Question about 2001 Hyundai XG300

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Check engine light is on and speedometer is not working. It is sluggish when running also.

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  • yadayada
    yadayada May 11, 2010

    Why my Check Engine/Service/Check Engines Soon light comes on? The engine computer or PCM/ECM All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions. The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part.

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Take it to a parts store and they will scan your computer for no charge and tell you exactly what is going on and what parts need to be replaced. Sounds like it may have a cylinder misfiring. Speedometer is most likely a fuse.

Posted on Nov 18, 2009

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Posted on Jan 02, 2017

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Speedometer doesn't work


For speedometer related issues,the help links are provided below.Click the link below to go through its details :----

How to trouble shoot speedometer?

http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html

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why speedometer not working? http://technoanswers.blogspot.com/2012/01/1996-fiat-bravo-speedometer-not-working.html

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Speedometer works but odometer not working? http://technoanswers.blogspot.in/2012/01/speedometer-works-but-odometer-not.html----------- Speedometer runs backward?

http://technoanswers.blogspot.com/2012/01/speedometer-runs-backward.html

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http://howtobyme.blogspot.com/2011/08/warning-lights-on-and-speedometer-died.html

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http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html

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Vehicles Cluster panel Not reading Miles?

http://schematicsdiagram.blogspot.com/2011/12/vehicles-cluster-panel-not-reading.html

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How odometer works in cars?

http://technoanswers.blogspot.com/2011/11/how-odometer-works-in-cars.html

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http://repairhelpcenter.blogspot.in/2012/02/speedometer-not-working-on-1993-ford.html

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This will help.

Thanks

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1 Answer

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does the check engine light come when this happens some vehicles when the speedometer stops working then the check light comes on does the engine change in the way it runs either at cruise or accelerating then this indicates a speed sensor in the transmission has an intermintant problem if there is no check engine light or change in the way the car runs then it is possible the problem is in the speedometer head or connections at the instrument cluster for the speedometer if the light is on then you need to have the computer checked to see if a code is set for the sensor,if so then that is probably were the problem is keep in mind it can also be a poor connection at the sensor,if this not were the problem is then it probably is in the cluster for the speedometer head or the speedometer head itself

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1 Answer

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How did you try to obtain the codes? Did you short pins E1 and Te1 in the grey connector under the hood?

When the light comes back on, short the above pins, and get back to us.

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1 Answer

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Hi,
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