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On-board diagnostics
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===OBD-II diagnostic data available=== OBD-II provides access to data from the [[engine control unit]] (ECU) and offers a valuable source of information when troubleshooting problems inside a vehicle. The SAE J1979 standard defines a method for requesting various diagnostic data and a list of standard parameters that might be available from the ECU. The various available parameters are addressed by "parameter identification numbers" or '''PID'''s which are defined in J1979. For a list of basic PIDs, their definitions, and the formula to convert raw OBD-II output to meaningful diagnostic units, see [[OBD-II PIDs]]. Manufacturers are not required to implement all PIDs listed in J1979 and they are allowed to include proprietary PIDs that are not listed. The PID request and data retrieval system gives access to real time performance data as well as flagged DTCs. For a list of generic OBD-II DTCs suggested by the SAE, see [[Table of OBD-II Codes]]. Individual manufacturers often enhance the OBD-II code set with additional proprietary DTCs.
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