How to Read the Check-Engine Codes on a Ford F-350 6-Liter Diesel Truck 1Locate the diagnostic connection port under the driver side dashboard. The port is roughly ½-inch tall by 2 inches wide. Remove the protective cap from the port and plug the scan tool diagnostic connector into the port.
The port resembles a multi-pin printer port for a computer system.2Follow the specific procedure in you scan tool operator’s manual for running a self test on the powertrain control module, the transmission control module and the fuel-injector control module. At each stage of the test when the codes display for each module, write the codes on your notepad, under the proper module designation. These codes correspond to specific pinpoint tests required in order to complete a full diagnosis of the problem.
3Complete the self test as specified in your scan tool operator’s manual. Select &ldquo Auto code scanner;No” when prompted to delete the codes. These codes should remain in the module’s memory. Once the problem's diagnosis and repair is complete, rerun the test and delete the codes.4Disconnect the scan tool's connector from the port under the dashboard when prompted to do so by your scan tool. Reinstall the protective cap on the diagnostic connection port Car Diagnostic Tools.
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