OBD-II PIDs (On-board diagnostics Parameter IDs) are codes used to request data from a vehicle, used as a diagnostic tool.. SAE standard J1979 defines many OBD-II PIDs. All on-road vehicles and trucks sold in North America are required to support a subset of these codes, primarily for state mandated emissions inspections.Manufacturers also define additional PIDs specific to their vehicles.

Scan tools like TOAD support various PIDS including live data values, the status of switches and other devices, the readiness status of various OBD II monitors, and other test results. Live data provides real-time measurements of system inputs. Statuses tell you if a switch, relay or other device is ON/OFF or has been commanded ON or OFF.

2014年10月1日 · For example, the standard stipulates that the engine speed has a PID of 12. The OBD standard (updated in 2007) includes 137 PIDs. As for the modes, not all cars support all PIDs. Mode 2. This mode gives the freeze frame (or instantaneous) data of a fault. When a fault is detected by the ECM, it records the sensor data at a specific moment when ...

2024年11月22日 · Decoding OBD2 PID Data. While OBD2 scanners present data in a user-friendly format, understanding the raw PID data can provide a deeper level of insight. This data is typically presented in hexadecimal format and requires some interpretation. Fortunately, numerous resources are available online and in service manuals that explain the meaning of ...

2024年11月9日 · Similarly, coolant temperature (PID 0105) might involve subtracting 40 from the raw data. Understanding these individual PID calculations is the first step to interpreting your vehicle’s data. You might find using an Arduino OBD2 …

2024年6月2日 · PID data serves as a valuable diagnostic tool, revealing various common issues within a vehicle. Engine misfires are frequently indicated through specific parameter IDs, highlighting a disruption in the combustion process. These misfires can stem from faulty spark plugs, fuel delivery problems, or issues with the ignition system. ...

We created this OBD2 PID table overview as we found other similar tables to be less intuitive (e.g. the OBD-II PID table on Wikipedia). In particular, the table uses a syntax similar to what is used in CAN databases ().This means that we provide the bit start, bit length, offset and scale factors required for extracting the relevant data bytes from the OBD2 PID response frame.

Data Bytes : The data bytes field contains the actual data values corresponding to the PID. The number and meaning of data bytes vary depending on the PID and the mode. For example, the engine coolant temperature may be reported as a single data byte representing the temperature in degrees Celsius.

2024年11月6日 · To use OBD2 PID codes effectively, you’ll need an OBD2 scanner and a list of relevant PID codes for your specific vehicle make and model. Connect the scanner to your car’s OBD2 port, usually located under the dashboard on the driver’s side. Then, select the desired PID code using the scanner’s interface to retrieve the corresponding data.

2020年4月8日 · 很显然，对位置式PID进行求导（dx = f(x) - f(x-1)），就得到了增量式PID。 对于前面谈到的，位置式PID的 I 环节，是对过去所有时间的偏差进行积分，其输出与过去所有时间都有关，而增量式的PID只于最近的三个时刻的偏差有关。