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Continuation of check when display shows 0 ??, as follows: > < Checking throttle valve positioner and throttle valve positioner potentiometer

Leon Mk2

Checking throttle valve potentiometer
Checking throttle valve potentiometer
Test conditions
l  Coolant temperature must be at least 80 °C ⇒ display group 1, display zone 2.
Test sequence
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-). Switch on ignition and use address word 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)
–  Check whether the coolant temperature is above 80 °C.
–  Change to display group 3 as follows: -V.A.G 1551-: Press key 3 twice -V.A.G 1552-: Press key ↑ twice
  
Read measured value block            1 →

      

      

    
      

      

    
Indicated on display: (1...4 = Display fields)
– 
          Read off throttle valve angle in display zone 3. Throttle valve in start position: 0...7 ∠°
– 
          On opening the throttle valve slowly up to full gas, taking note of the value of the angle in field 3. This value should increase uniformly up to 75 ∠° min.
– 
          Press → key.
– 
          Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
– 
          Switch off ignition.
 
      Note!
The displayed figure is dependent on the tolerances of the throttle valve potentiometer and does not correspond to the actual opening angle.
If the figure does not increase uniformly:
– 
          Replace throttle valve control part  → Item.
If the display constantly shows 0 ∠° or is above 90 ∠°:

      		 
      
    
Read measured value block            3 →

      

      

    
Displayed
value		CauseContinue checking
0 ∠°Open circuit or short to positive → Chapter
Above 90 ∠°Short to earth → Chapter


      

      

    
       
      
     
      

      

    


Continuation of check when display shows 0 ??, as follows: >
< Checking throttle valve positioner and throttle valve positioner potentiometer