Appendix A – PID Definitions
All global parameter identification data (PID) listed was verified on actual vehicles to guarantee accuracy. PID Definitions were obtained from reliable sources and are accu- rate at time of printing. It is possible that some newer vehicles may contain data different from that listed in Appendix A. Always refer to vehicle service manual for manufacturer specific PIDs.
The PID list is organized in alphabetical order — the same way the scan tool does. Remember, always refer to a vehicle service manual for detailed diagnostic procedures when troubleshooting incorrect PID values.
Types of Data Parameters
INPUT:These data parameters are obtained from sensor circuit outputs. Sensor circuit outputs are inputs to vehicle’s PCM. For example, if Oxy- gen Sensor circuit was generating a 400mV signal, then scan tool would read O2S (v) 0.40.
OUTPUT:These data parameters are outputs or commands that come di- rectly from computer module(s). For example; the ignition spark advance is controlled by PCM, on most vehicles, monitoring this PID shows spark output from PCM. The scan tool would display IGN ADV(º) 10.
CALCULATED:These data parameters are calculated after analyzing various inputs.
VALUE the vehicle’s computer module(s). For example, the engine load. The PCM calculates this from sensor inputs and displays it in a percent- age.
PCM VALUE:Is information that is stored in the computer module(s)’ memory and determined to be useful to service technician. An example of this is TROUBLE CODE value, the DTC that caused a freeze frame capture.
✓NOTE: Several different causes can have the same parameter indication. For information on diagnostics consult vehicle service manuals.
DATA PARAMETER LIST
ABS FRP (0 - 65,5350 kPA) or (0 - 95050.5 psi)
Absolute Fuel Rail Pressure is the fuel pressure at the engine in respect to atmospheric pressure.
ABS LOAD (0 - 100%)
Absolute Load Value is the normalized value of air mass per intake stroke in percentage.
ABSLT TPS (0 - 100%)
Absolute Throttle Position represents normalized distance the throttle is opened.
ACC POS D,E or F (0 - 100%)
Accelerator Pedal Position represents normalized distance the gas pedal is pressed. A
BARO PRESS (0 - 255 kPA) or (0 - 36.9 psi)
Barometric Pressure is usually received from a dedicated barometer, manifold absolute pressure sensor, and other inputs during certain modes of driving.
✓The Baro Press may not exhibit the same value as weather services, which measure barometric pressure at sea level.
CALC LOAD (0 - 100%)
Calculated LOAD Value indicates the normalized load value on the engine.
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