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Connect it to a code reader scan tool. The engine light codes will tell you some of the reason, but Jeff's answer is far better than mine regarding how all this stuff works..
Check the cigarette lighter fuse. This is what powers the DLC. If the fuse is good, check and see if the lighter works. If not, you have a bad wire. Code readers have to have power from the car. Most scanners have there own power and will read the computer, unless the data wire is bad or the computer is bad.
Go to your local O'Rielly's or Autozone. They will tell you the code and reset it for free. Otherwise take the negative battery cable loose for about 10 min. This will clear the ECM, but you won't know what tripped the light! Best Wishes, TJ
if the check engine light is on then there is a code and you may have to have one of the other computers checked for a code as another one could set the light on for example the tcm(transmission computer module).sometimes a fault won`t show but a problem is there in which case you will have to check it initially the old fashioned way,then proceed from there.
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