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21
*Tip: 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.
Clear Trouble Code: It allows to clear current and historical trouble codes
memory in ECU, under the premise that all the troubles are eliminated.
Fig 4-7 Sample of Clear Codes
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. Suggestion: users should better not clear
trouble codes, we need to record the trouble details after reading the code,
which is provided as a reference for maintenance. After dealing with
troubles, there will be no trouble code when we re-read.
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.
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