22
Figure 4-9 Sample of Read DTC
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 clearing current and historical trouble codes memory in ECU,
under the premise that all the troubles are eliminated.
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. 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
