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Checking voltage supply and wiring to control unit > < Checking throttle valve positioner and throttle valve positioner potentiometer

Leon Mk2

Checking throttle valve potentiometer
Checking throttle valve potentiometer
Test conditions
l  Coolant temperature, 80°C, minimum.
Checking process
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-). Then switch ignition on and enter “address code” 01 to select engine control unit. (Fault reader: Connecting and selecting the engine control unit → Chapter.)
   
Indicated on the display:
–  Press keys 0 and 8 for the function “Read measured value block” and confirm entry with the Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on the display:
–  Press keys 0, 0 and 3 for “Display group number 3” and confirm entry with the Q key.
  
Read measured value block           HELP
Input display group number XXX
Indicated on the display: (1…4 = display zones)
–  Read off throttle valve angle in display zone 3.
–  Open the throttle valve slowly to full gas, observing the angle displayed in zone 3. The numerical value must increase uniformly within the entire range.
–  Press the → key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
–  Switch ignition off.
If the figure does not increase uniformly:
–  Replace throttle valve control unit → Item.
If the display constantly shows 0 ∠° or is above 90 ∠°:
–  Remove air filter → Fig..
  
Read measured value block 3           ->
         1         2         3         4
IndicatedCauseContinuation of check
0 ∠°Open circuit or short to positive →  
Above 90 ∠°Short to earth →  

Continue checking if 0 is indicated ∠°:
   
–  Remove connector -1- from throttle valve control unit -2-.
–  Bridge connector contacts 5+7 with auxiliary cables from -V.A.G 1594- and observe display.
Indication of over 90 ∠°:
–  Press the → key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
–  Switch ignition off.
–  Replace throttle valve control unit → Item.
Indication 0 ∠°:
–  Press the → key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
–  Switch ignition off.
–  Check voltage supply of throttle valve control unit and wiring to control unit → Chapter.
If the voltage supply and wiring are OK:
–  Replace the engine control unit → Item.
Continuation of checking in case of indication of more than 90 ∠°:
  N24-0303
–  Remove connector -1- from throttle valve control unit -2-.
Indication 0 ∠°:
–  Press the → key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
–  Switch ignition off.
–  Replace throttle valve control unit → Item.
Indication of over 90 ∠°:
–  Press the → key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
–  Switch ignition off.
–  Check voltage supply of throttle valve control unit and wiring to control unit → Chapter.
If the voltage supply and wiring are OK:
–  Replace the engine control unit → Item.
  N24-0299

Checking voltage supply and wiring to control unit > < Checking throttle valve positioner and throttle valve positioner potentiometer