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Speed signal: checking > < Check conditions

Leon Mk2

Test sequence
Test sequence
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-). Start engine and use address code 01 to select engine control unit. (Connecting fault reader and selecting engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Indicated on display:
–  Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press keys 0, 0 and 1 for “Display group number 1” and confirm entry with Q key.
  
Read measured value block               
Input display group number XXX
Indicated on display: (1...4 = Display fields)
–  Observe -8 digit number block- in display zone 4:
3. 3rd position from left must display 0 Display: 00000000
–  Switch on air conditioning system.
–  Select lowest temperature and highest blower speed.
3. 3rd position from left must display 1 Display: 00100000
–  Floor accelerator pedal quickly and release again (short throttle burst).
When the accelerator pedal is depressed quickly the 3rd position from left in display zone 4 must display a “0” for a few seconds (compressor switch-off when vehicle is accelerating).
–  Press → key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
–  Switch off ignition.
If the display does not indicate as described:
  
Read measured value block       1      →

      

      

    
      

      

    
– 
          Connect test box -V.A.G 1598/22- to control unit wiring harness.
– 
          Check wiring between test box sockets 8 + 10 and air conditioner for open circuit using current flow diagram. Wire resistance: max. 1.5 Ω
If no fault can be found in the wiring:
– 
          Check function of air conditioning:  → Heating, Air conditioning; Rep. Gr.87

      		 
      
    N24-0709
      

      

    


Speed signal: checking >
< Check conditions