Test Functions - Xtool EZ400PRO Manual

EZ400PRO Diagnosis System
entering European cars menu, selection for Asia means entering Asian cars menu, selection
for America means entering American cars menu, selection for China means entering
Chinese cars menu. Users also can input vehicle model to search.

4.2. Test Functions

4.2.1. Take Volkswagen car for example, select Diagnosis, then select Europe Car, users
can see Volkswagen's logo. If the logo has not been seen, please swipe up and down or enter
the car model to research.
Different vehicles have slight different menus.
Common main function menu includes the following options:
Read ECU: this function is to read ECU version information, which is the equivalent of
"System Identification" or "System Information" in some electronic control systems, all mean to
read ECU related software and hardware versions, models and production date of diesel
engine, part number, etc. It is convenient for us to make record in the maintenance process,
and it also makes later date feedback and management easier.
Read DTCs: read trouble codes stored in ECU.
Clear DTCs: clear current and historical trouble codes memory in ECU, under the premise that
all the troubles are eliminated. The trouble codes can not be erased without eliminating all the
troubles, which will cause the diagnostic tool always reading the trouble code because the
code will always be saved in ECU. Suggestion: users should better not to clear trouble codes,
we need record the trouble details after reading code, which is provided as 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 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 in maintenance. For some vehicles, during their actual operation, the
problems such as performance characteristics offset, sensitivity reduction, can be judged in
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