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The best way to Troubleshoot a Service Engine Soon Light Pulling "Check Engine" Light Codes with a Scanner1Locate the test port link beneath the dash, also called the Assembly Line Diagnostic Link (ALDL). It is a smaller, 12-16 point electrical port and it may possess a plastic cover.2Plug the scanner in to the test port and turn the ignition crucial in to the "On" position. The dash panel lights and radio will come on however the engine will not be cranked.3Answer the prompts on the scanner screen to identify the make, model and year of one's automobile. Choose the option to pull the "Service Engine" codes.Other Strategies for Pulling "Service Engine" Codes4Turn the ignition key on, then turn on and off quickly in this succession: on auto diagnostics software, off, on, off, on. Finish together with the important within the "On" position. Watch the "Check Engine" light. It is going to flash a series of instances to indicate trouble codes stored inside the laptop. As an illustration, Code 23 will flash this way: flash, flash, pause, flash, flash, flash. Seek the advice of your owners manual to discover what the codes imply or click the offered link.5Locate the ALDL beneath the dash. If you have a 12 pt. ALDL port, you are able to connect ports "A" and "B" to start the diagnostic sequence. Use a jumper wire or an unbent paper clip to connect the ports and watch the "Check Engine" light for codes car diagnostic tool. This technique won't operate on 16 pt. ports.6Turn the essential on and depress the odometer trip and reset buttons at the identical time. Codes study from the odometer display in vehicles with digital dash clusters.