The only way to tell why the light is on is to have a diagnostic computer hooked up to the computer and read the engine codes. I have a 93 nissan pathfinder with the computer under the passenger seat, You can test your own codes right from here with just a flathead screwdriver. You can also go to autozone.com and register for full free online repair manual for your truck
Run scanner for trouble codes, some auto parts store will do this for free
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
-----------
http://whatisbyme.blogspot.in/2012/05/2007-toyota-highlander-hybrid-yellow.html
-----------
------------
http://whatisbyme.blogspot.in/2012/05/car-runs-fine-but-check-engine-light-is.html
----------
http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
----------
http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
----------
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
-------------
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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