Why my Check Engine/Service 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.
Check
engine light comes on and off, these are indication that there is some
error code stored in your vehicles ECM. The engine module computer
needs to be scanned. These will give the code and as per the error code the
further problem can be detected and confirmed. The engine light
indicator blinks or remains steady on dash when engine computer
noticed any problem with any engine electrically operated components.
For
more help, I suggest you to refer the help links provided below. These will let
you know more about which areas to look, check, when there is engine light
coming up on dash panel.
---------
Click
the link below: -------
CHECK ENGINE LIGHT
http://alltypesofpartsreplacing.blogspot.com/2012/12/check-engine-lightengine-warning-light.html
---------------
Check Engine Light Reset Procedure?
http://whoisbyme.blogspot.in/2012/06/check-engine-light-reset-procedure.html
----------
These will help.
Thanks.
Check
engine light comes on and off, these are indication that there is some
error code stored in your vehicles ECM. The engine module computer
needs to be scanned. These will give the code and as per the error code the
further problem can be detected and confirmed. The engine light
indicator blinks or remains steady on dash when engine computer
noticed any problem with any engine electrically operated components.
For
more help, I suggest you to refer the help links provided below. These will let
you know more about which areas to look, check, when there is engine light
coming up on dash panel.
---------
Click
the link below: -------
http://whoisbyme.blogspot.in/2012/06/malfunction-indicator-light-on.html
---------
http://howtobyme.blogspot.in/2012/02/check-power-train-message-with-orange.html
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http://whatisbyme.blogspot.in/2012/05/2007-toyota-highlander-hybrid-yellow.html
-----------
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http://whatisbyme.blogspot.in/2012/05/car-runs-fine-but-check-engine-light-is.html
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http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
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http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
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http://schematicsdiagram.blogspot.com/2011/12/vehicle-smog-test-failed-due-to-no.html
http://schematicsdiagram.blogspot.in/2012/02/obd-code-is-cleared-but-check-engine.html
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http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html
-----------------
http://schematicsdiagram.blogspot.in/2012/02/toyota-camry-check-engine-light-flashes.html
-------
These
details will help.
Thanks.
http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html
------------
Toyota Camry Check engine light flashes while
driving?
http://schematicsdiagram.blogspot.in/2012/02/toyota-camry-check-engine-light-flashes.html
----------1999 Toyota Tacoma: Check Engine Light
Read Code P0171?
http://whatisbyme.blogspot.in/2012/05/1999-toyota-tacoma-check-engine-light.html
--------
2007 Toyota Highlander Hybrid: Yellow Check
Engine Light ON dash?
http://whatisbyme.blogspot.in/2012/05/2007-toyota-highlander-hybrid-yellow.html
--------Check engine light with codes P2195 and
P2197?
http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
---------Car Runs Fine But Check Engine light is ON?
http://whatisbyme.blogspot.in/2012/05/car-runs-fine-but-check-engine-light-is.html
----------After replacing throttle body the Check engine light starts
blinking?
http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html
---------OBD Code is cleared but check engine light
will not RESET?
http://schematicsdiagram.blogspot.in/2012/02/obd-code-is-cleared-but-check-engine.html
--------These will help.Thanks.
http://schematicsdiagram.blogspot.com/2011/12/after-getting-car-washedcheck-engine.html
---------
After replacing throttle body the Check engine
light starts blinking?
http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html
---------
This details will help you.Thanks.
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