OBDII is a set of standards and practices used to fine tune emission programs across vehicle makes and models. It isn't a diagnostic system, it is an emission program. Knowing how OBDII is set up though can often be useful when you actually are doing vehicle diagnostics. There are 10 modes to OBDII. Generic or Global OBDII Mode 1 is there to display current data. Key to know here is that Global Mode 1 data is the actual sensor data as seen by the computer. If you are in OEM datastream, or Enhanced OBDII datastream you may not be seeing the actual data. In those modes, sometimes signals are substituted by default. Not all scan tools (or code readers) can read data and not all can read the various types of data. OBDII Mode 1 is limited to emission related data, yet it is *actual* emission related data.
Remember that Global OBDII Mode 1 is actual data.
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