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That is to read the parameters of the running engine, such as oil pressure,
temperature, engine speed, fuel oil temperature, coolant temperature, intake
air temperature, etc. Based on these parameters, we can judge directly
where the problem lies, which helps to narrow the scope of maintenance.
For some vehicles, during their actual operation, the problems such as
performance characteristics offset, sensitivity reduction, can be judged in live
data.
In the process of diagnosis, if the device shows "System is OK" or "No
Trouble Code", it means there is no related trouble code stored in ECU or
some troubles are not under the control of ECU, most of these troubles are
mechanical system troubles or executive circuit troubles, it is also possible
that signal of the sensor may bias within limits, which can be judged in Live
Data.
Click the magnifying glass on the top right, you can search for related
⚫
PIDs based on keywords.
Figure 4-11 Sample of PIDs List
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