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Open up the hood.
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Remove the positive terminal cable from the battery using your pliers or wrench.
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Go to your fuse box in your car, and look at the diagram. Select the fuse that is labeled "ECM" and remove this fuse. Sit the fuse aside for now.
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Keep the car disconnected like this for two to three minutes to clear the computer's memory.
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Insert the fuse back in to the box. Reconnect the battery terminal. Your car should now be reset.
Sometimes you can just pull the cable off the battery for a while and putting it back on will adjust some computer components. I do this when my check engine light is on and it has been diagnosed as nothing wrong!