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Airflow Sensor Potentiometer: Adjustment

  1. Using Sensor Plate Adjustable Holder (VW 1348/1), lift sensor plate to lower edge (fuel distributor side) of airflow sensor housing. See Figure . Install potentiometer. Partially tighten screws so that adjustment is possible. Connect multimeter between test harness terminal No. 2 and ground.
  2. Reconnect vehicle harness to Test Harness (VW 1501). Set multimeter on 20 DCV scale and turn ignition on. Reading should be .2-.5 volt on Quantum models, .02-.2 volt on Cabriolet and Scirocco models or .2-.3 volt on all other models. If not, move potentiometer until reading is correct. Tighten mounting screws. To check adjustment, lift sensor plate to stop. Reading should be 7 volts. If correct, secure mounting screws with Loctite.
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