Xtool D9 Pro User Manual page 45

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. There are two types
of fault codes, one is a permanent fault code and the other is a non-
permanent fault code. The former requires manual troubleshooting of the
36