Audi Cars 1999-05

Reading & Clearing Codes

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Clearing Codes



The VAG1551/VAG1552 scan tool, with VAG1551/3 adapter cable, is required to erase the diagnostic trouble codes (DTCs) from the ECM memory.

  1. Connect the scan tool to the diagnostic connector and press buttons '0' and '1' to insert 'Engine Electronics: Address Word 01' (engine running at idle).
  2.  
  3. Press buttons '0' and '2' to select 'Check DTC Memory: Function 02'.
  4.  
  5. Press the 'Q' button to confirm input.
  6.  
  7. Press the button to advance through program sequence until all stored malfunctions have been displayed.
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  9. Press buttons '0' and '5' to select 'Erase DTC Memory: Function 05'.
  10.  
  11. Press the 'Q' button to confirm input.
  12.  
  13. Press the button to advance through program sequence.
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  15. Press buttons '0' and '6' to select 'End Output: Function 06'.
  16.  
  17. Press the 'Q' button to confirm input.
  18.  
  19. Road test the vehicle to ensure all problems have been repaired.
  20.  
  21. Initiate the 'Automatic Test Sequence' by pressing the '0' button twice to insert 'Address Word 00'.
  22.  
  23. Check the readiness code. If the DTC memory has been erased, or ECM has been disconnected, generate a readiness code.
  24.  

Control module reset procedures are a very important part of OBD II System diagnostics. This step should be done at the end of any fault code repair and at the end of any driveability repair.

Clearing codes can be performed by any of the methods below:



Clear the control module memory with the Generic Scan Tool (GST)
 
Clear the control module memory with the vehicle manufacturer-s specific tester
 
Turn the ignition OFF and remove the negative battery cable for at least 1 minute.
 

Removing the negative battery cable may cause other systems in the vehicle to loose their memory. Prior to removing the cable, ensure you have the proper reset codes for radios and alarms.


NOTE
The MIL will may also be de-activated for some codes if the vehicle completes 3 consecutive trips without a fault detected with vehicle conditions similar to those present during the fault.

Reading Codes



Reading the control module memory is one of the first steps in OBD II system diagnostics. This step should be initially performed to determine the general nature of the fault. Subsequent readings will determine if the fault has been cleared.

Reading codes can be performed by any of the methods below:



Read the control module memory with the Generic Scan Tool (GST)
 
Read the control module memory with the VAG 1550 tester
 

To read the fault codes, connect the scan tool or tester according to the manufacturer-s instructions. Follow the manufacturer-s specified procedure for reading the codes.

 
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