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Interpreting Generic Scan Data. By Bob Pattengale. Readily available 'generic' scan data provides an excellent foundation for OBD II diagnostics. OBD II Diagnostic Trouble Codes are codes that are stored by the recording customized live data list; views previous frames of. OBD II Diagnostic Trouble Codes are codes that are stored by the recording customized live data list; views previous frames of.Any number above 0% would indicate the PCM is richening the air fuel mixture. The short term fuel trim is live correction based on O2 sensor voltage. The PCM