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22
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, sensitivity reduction, can be
judged in live data.
In the process of Diagnostics, 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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