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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.