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Figure 4-10 Sample of Clear DTC
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.
◼ 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, and 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.
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