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Appendix A – PID Definitions
Global PID Definitions
All global parameter identification (PID) data listed were verified on actual vehicles to guarantee accuracy. PID definitions were obtained from reliable sources and are accurate at time of printing. It is possible that some newer vehicles may contain data different from what is listed. Always refer to vehicle service manual for manufacturer specific PIDs.
Remember, always refer the applicable service manual for detailed diagnostic procedures when troubleshooting PID values.
Types of Data Parameters
INPUT: These data parameters are obtained from sensor circuit outputs. Sensor circuit outputs are inputs to the vehicles PCM. For example, if oxygen sensor circuit was generating a 400mV signal, then the code reader would read O2S (v).40.
OUTPUT: These data parameters are outputs or commands that come directly from control module(s). For example, the ignition spark advance is controlled by PCM, on most vehicles, monitoring this PID shows spark output from PCM.
CALCULATED These data parameters are calculated after analyzing
VALUE: various inputs to the vehicles control module(s). For example, the engine load. The PCM calculates this from sensor inputs and displays in a percentage.
PCM VALUE: Information that is stored in the control module(s) memory and determined to be useful to service technician. An example of this is TROUBLE CODE values, the DTC that caused a freeze frame capture.
NOTE: Several different causes can have the same parameter indication. For information on diagnostics consult applicable service anuals.
NOTE: The Scan Tool only displays the PID’s the vehicle supports.