Question about 2000 Jeep Cherokee
As the Engine Light Stays ON, this refers to some Problem with the Car. There are certain codes stored in the computer of the Car that would help you to fix the problem. It does not make sense to troubleshoot each and every aspect of Car when you have the Engine Light Stays On. Take the Car to the Auto Zone and get the Car Scanned for Codes. Once you get the Error Codes, let me know so that i could tell you How to Fix that.
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Posted on Nov 17, 2009
Although the gas cap is one reason the light can come on there are at least 200 others reasons as well, what follows is an explanation for why the light comes on and what to do, I did not write this buy based on my 30 years of electronic engine control repairs I could not have said it better or clearer, the bottom line is you will need to have a trouble code test run.
Why Your Check Engine Light Comes On
About the engine computer, known as PCM (1996 up) or ECM (1995 and down)
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
Posted on Nov 17, 2009
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Posted on Jan 02, 2017
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