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25
However, the trouble codes can’t be erased without eliminating all the
troubles, which will cause the diagnostic tool to always read the trouble code
because the code will always be saved in ECU, and some active fault codes
need to perform some special functions, or remove the car hardware failure
before clearing.
◼ Read Live Data
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.
Figure 4-11 Sample of PIDs List
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.
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