5.OBD-II
This chapter describes the concept, protocols, test functions, and basic operation of
the OBD-II/EOBD function.
This option provides a quick way to check DTCs, identify the cause of an illuminated
malfunction indicator lamp (MIL), check monitor status prior to emissions
certification testing, verify repairs, and perform other emissions-related services.
The OBD-II function allows you to access "generic" OBD-II data.
Generic OBD-II data is data limited to emission related diagnostics such as:
• Checking for emissions-related diagnostic trouble codes (DTCs)
• Checking the cause of an illuminated malfunction indicator lamp (MIL)
• Checking monitor status prior to emissions certification testing
To access other available electronic control module (ECU) data for vehicle-specific
systems, parameters, or enhanced diagnostics, use ''Auto Scan'' or ''Diagnostic'' to
access all systems or individual system diagnostics. The OBD-II function is used to
access ''generic'' OBD-II/EOBD data for OBD-II/EOBD compliant vehicles that are not
included in the all systems or individual systems diagnostics.
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