The Function--"Read Codes" of The Autel Maxiservice VAG505

If you are going to use the Autel Maxiservice VAG505 to do the function of reading codes,then it can be done with the key on engine off ,also with the key on engine running is ok.Before we talk about how to use the tool to read codes,let's see the different codes first.

The stored codes,which are also been called "hard codes",are fault codes or trouble codes,because the faults have reoccurred for more than a specified amount of key-cyclethey,they are stored in the vehicle 's computer memory.When emission-related fault occurs,these stored codes would cause the control module to illuminate the malfunction indicator light.
Then the pending codes,which are also been called "maturing codes" or "continuous monitor codes",can indicate the problems that the control module has detected during the current or last driving cycle.Dislike the stored codes,the pending codes won't turn on the malfunction indicator lamp.Within a certain number of warm-up cycles,if there doesn't occur the fault,the pending codes will be cleared from memory.
And the permanent codes are the DTCs that are retained in the non-volatile memory of the computer after the appropriate monitor for each DTC has determined that the malfunction is not present and won't cause the malfunction indicator lamp on. The permanent DTC will be in non-volatile memory and won't be erased by any diagnostic services or by disconnecting power to ECU.
Next,we can see how to operate the Autel Maxiservice VAG505.
Select the "Read Codes" from the "Diagnostic Menu" by using the "UP/DOWN" scroll button.Then you can select "Stored Codes","Pending Codes" or "Permanent Codes" in the menu of "Read Codes".If there has no diagnostic trouble code,the display will show "No (pending) codes are stored in the module";If there has more than one DTC be found,you can check all the codes one by one;If retrieved DTCs contain any manufacturer specific or enhanced codes,there will appear "Manufacturer specific codes are found!Press any key to select vehicle make!",you can select the vehicle manufacturer to view DTC definitions.