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Home >> Volkswagen >> 1985 >> Quantum Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH Cis-E >> Adjustments >> Airflow Sensor Potentiometer
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Airflow Sensor Potentiometer

  1. Check sensor plate rest position and adjust if necessary. Edge of plate closest to fuel distributor must be .069-.079" (1.75-2.05 mm) below lower edge of sensor housing venturi cone. Disconnect wiring from potentiometer. Connect Test Harness (VW 1501) to potentiometer, leaving vehicle harness plug disconnected.
  2. Using Digital Multimeter (US 1119), measure resistance of potentiometer at terminals of test harness. Harness terminal 1 corresponds to potentiometer terminal 18; terminal 2 corresponds to potentiometer terminal 17; terminal 3 corresponds to potentiometer terminal 14.
  3. Reading should be greater than 4000 ohms with meter between harness terminals 1 and 2. Reading should be less than 1000 ohms with meter between terminals 2 and 3. Reading should increase evenly up to 4000 ohms as sensor plate is lifted smoothly. If readings are not correct, replace potentiometer.
  4. Using Sensor Plate Adjustable Holder (VW 1348/1), lift sensor plate to lower edge (fuel distributor side) of airflow sensor housing. Install potentiometer, tightening screws so that adjustment is possible. Connect multimeter between test harness terminal 2 and ground.
  5. Set multimeter on 20-volt DC scale and turn on ignition. Reading should be .2-.3 volts. If not, move potentiometer until reading is correct. If correct, tighten mounting screws. To check adjustment, lift sensor plate to stop. Reading should be 7 volts. If correct, secure mounting screws with Loctite on heads.
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