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Final control diagnosis > < Self-diagnosis - general aspects

Leon Mk1

Fault memory: Interrogating and erasing fault memory
Fault memory: Interrogating and erasing fault memory
Special tools and workshop equipment required
   
t  Fault reader -V.A.G 1551- (or vehicle system tester -V.A.G 1552-) with -cableV.A.G 1551/3B-
Work sequence
–  Connect fault reader -V.A.G 1551- (-V.A.G 1551-) and select engine electronics control unit with the “Address code” 01. When doing so the engine must be idling. Fault reader: Connecting and selecting the engine electronics control unit → Chapter.
Only when engine does not start:
–  Switch ignition on.
–  Switch the fault reader printer on by pressing the Print key. The warning lamp in the key must light up.
  W00-0459
Indicated on the display:
–  Operate the fault reader taking into account the information on the display:
–  Select function mode 1 “ Rapid data transfer”.
–  Press keys 0 and 1 for function “Engine Electronics” and confirm entry with the Q key.
–  Press the → key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on the display:
–  Press keys 0 and 2 for function “Interrogate fault memory” and confirm entry with the Q key.
  
Rapid data transfer                 HELP
Select function XX
The display will show either the number of faults stored or “No fault recognised”.
If one or more faults are stored:
The stored faults will be displayed and printed out one after the other.
  
X faults recognised                     

      

      

    
      

      

    
After the stored faults have been printed out, the display will show:
– 
          Press keys 0 and 5 for the function “Erase fault memory” and confirm entry with the Q key.
 
      Note!
If the ignition is switched off between “Interrogate fault memory” and “Erase fault memory” the fault memory will not be erased.

      		 
      
    
Rapid data transfer                 HELP
Select function XX                      

      

      

    
      

      

    
Indicated on the display:
– 
          Press the → key.

      		 
      
    
Rapid data transfer                   ->
Fault memory is erased                  

      

      

    
      

      

    
Indicated on the display:
– 
          Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
– 
          Eliminate the faults printed out using the fault table  → Chapter
Automatic check cycle
During test and assembly work, faults can be recognised from other control units like e.g. plugs disconnected. Accordingly, once work is completed, fault memories of all control units must be interrogated and erased. To do this:
– 
          Press key 0 twice for address code “Automatic test sequence” and confirm entry with the Q key. The -V.A.G 1551- will transmit all known address codes one after the other.
If the control unit answers with its identification, the number of faults found or the message “no fault recognised” will appear on the display.
Any system faults that are stored will be displayed and printed out one after the other. The -V.A.G 1551- will then transmit the next address code.

      		 
      
    
Rapid data transfer                 HELP
Select function XX                      

      

      

    
      

      

    
The automatic test sequence has ended when the following is indicated on display:

      		 
      
    
V.A.G- SELF-DIAGNOSIS               HELP
1 - Rapid data transfer                 

      

      

    
      

      

    
or
– 
          Erase all fault memories and then carry out a test drive. 
– 
          During the test drive, the following operating conditions must be fulfilled:
l 
           The coolant temperature must exceed 80 °C.
l 
           When the temperature is reached the operating conditions must be reached several times
t 
           Idling
t 
           Partial throttle
t 
           Full throttle
t 
           Overrun
l 
           At full throttle, revolutions must exceed 3,500 rpm.
– 
          Again interrogate the fault memories of all control units using the “automatic test sequence”.
If no fault is stored:
– 
          Press the → key.

      		 
      
    
V.A.G- SELF-DIAGNOSIS               HELP
2 - Flash code output                   

      

      

    
      

      

    
Indicated on the display:
– 
          Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
– 
          Switch off ignition.
 
      Note!
If the self-diagnosis has not detected faults, you must refer to the corresponding fault table in “Fault finding, Engine” folder to continue with fault finding..

      		 
      
    
Rapid data transfer                 HELP
Select function XX                      

      

      

    


Final control diagnosis >
< Self-diagnosis - general aspects