Four tips you may know before you check engine light diagnosis


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Four tips you may know before you check engine light diagnosis.

1.Plug your scan tool into the standard OBD II connector under the driver's side dashboard. Turn the key and let the tool initialize, keying in any data it asks for, such as the VIN, make, model and engine type. Now you can read trouble codes, erase them, check to see if any readiness monitors aren't complete and even look at engine data in real time while someone drives the car.

2.To get started, plug the scan tool into the OBD II connector under the dash. Turn the key on, but don't start the engine. The tool will ask for a number of things such as the VIN, the make and model of the vehicle and the engine type. Follow the onscreen instructions.



3.You'll get an option to check for trouble codes, as well as a couple of other menu choices. Some higher-end scan tools give you a text explanation of the code onscreen. Others give you a CD-ROM or just a paper pamphlet listing what the codes mean. Your best bet is to search the Web for a trouble-code list on a site that focuses on your particular vehicle--there will be information that might be far more helpful than just the code. When you read these codes, write them down before resetting the MIL indicator.

4.Inspection and maintenance (I/M) readiness will likely be another menu option. If you've turned off the MIL, your car needs to be driven until the PCM is sure that the fault has been corrected. How long? Every manufacturer has its own ideas, but a few days of normal driving should fulfill what are called I/M readiness tests. Why do you care? Because if you go to the DMV or an independent station for an inspection, the technician will plug in his own scan tool, and if your car hasn't passed I/M readiness, there'll be no sticker for you. I/M readi­ness is to keep people from sneaking a poorly running car through the emissions test by clearing codes just before pulling up to the DMV.

Article from : DIY Check Engine Light Diagnosis

Learn more details from this video channel : Car and Driver Magazine





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