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Test the throttle valve actuator and the actuator's potentiometer > < Check the operating state

Leon Mk2

Check the throttle valve's potentiometer
Check the throttle valve's potentiometer
Test condition
l  Coolant liquid temperature, 80 °C at least
Testing procedure
–  Attach the unit -V.A.G. 1551- (-V.A.G. 1552-). Switch on the ignition and enter “direction code” 01 to select the engine control unit. (Fault finder: Connect and select the engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Display reading:
–  Press buttons 0 and 8 for the function “Read the measurement values block” and confirm the entry with the Q button.
  
Rapid data transfer                 HELP
Select function XX
Display reading:
–  Press buttons 0, 0 and 1 for “display group 1” and confirm the entry with the Q button.
  
Read measurement values block       HELP
Enter display group number XXX
Display reading: (1...4 = display fields)
–  Check in display field 2 whether the coolant temperature is above 80 °C.
–  Change to display field 3 proceeding as follows:
–  Press the C button.
  
Read measurement values block 1        →
         1         2         3         4
Display reading:
–  Press buttons 0, 0 and 3 for “Display group number 3” and confirm the entry with the Q button.
  
Read measurement values block       HELP
Enter display group number XXX
Display reading: (1...4 = display fields)
–  Read the throttle valve angle in display field 3. Vehicles with power assisted steering, air conditioner: Theoretical value: 3.0...8.0 ∠° Vehicles without power assisted steering or air conditioner: Theoretical value: 2.7...7.0 ∠° Open the throttle valve slowly, all the way, observing the angle reading in field 3. The numerical value must increase uniformly throughout the range.
–  Press the button →.
–  Press buttons 0 and 6 for the function “End data transmission” and confirm the entry with the Q button.
–  Switch off the ignition.
  Note!
The value displayed depends on the throttle valve potentiometer's tolerance, and does not correspond to the real angle of aperture.
If the numerical value does not increase uniformly:
–  Replace the throttle control unit → Chapter
If the reading remains constant:
–  Test throttle control unit voltage supply and the cables in the direction of the control unit → Chapter.
  
Read measurement values block 3        →
         1         2         3         4

Test the throttle valve actuator and the actuator's potentiometer > < Check the operating state