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Quote:Mode 01: Show current data (real-time)
Also called Parameter Identification Diagnostics (PID). Because every car brand and type is different, the first question or ‘PID query’ the scan tool will ask the car system is which PIDs the diagnostic system supports. This system will answer with a ‘PID response’ in which the number of supported PIDs is included. There are lists of normalised PIDs (SAE J1979), we will only look at the most used ones. We only use 3 PID’s in our project (they are written in italic).
PID 00h = PIDs supported [01 - 20]
(returns 4 data bytes)
PID 01h = Monitor status since DTCs have been cleared.
(Includes malfunction indicator lamp (MIL) status and number of DTCs)
PID 02h = Freeze DTC
PID 03h = Fuel system status
PID 04h = Calculated engine load
PID 05h = Engine coolant temperature
PID 0Ah = Fuel pressure
PID 0Ch = Engine RPM
(returns 2 data bytes)
PID 0Dh = Vehicle speed
(returns 1 data byte)
PID 11h = Throttle position
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