REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Unplug the electrical connection from the potentiometer.
- Remove the screws securing the potentiometer, then remove it from the airflow sensor assembly.
- Install the potentiometer on the airflow sensor. Thread the screws in, but they should still be loose.
- Engage the electrical connection.
- Adjust the potentiometer.
- Connect the battery cable.
See Figures 1, 2 and 3
- Lift the sensor plate up to the lower edge (on the fuel distributor side) of the airflow sensor. This can be done with tool VW 1348/1.
- Connect jumper harness VW 1501 between the potentiometer and the connector. Connect a voltmeter to terminals 2 and 3 on 16-valve engines and to terminal 2 and ground on other models. Switch the meter to the DC 20 volt range.
- Turn the ignition ON . Adjust the potentiometer so that the meter displays between 0.02-0.2 volts on 16-valve engines and 0.2-0.3 volts on other models, then tighten the screws.
- Lift the sensor plate up to its stop. The meter should display approximately 7 volts. Lock the screws with a sealing compound or paint.
See Figure 4
- Place tool VW 1348/1 centrally on the edge of the airflow sensor assembly. Pointer (3) faces the center of the fuel distributor.
- Push the adjusting slide (2) down onto its stop. Turn setting screw (1) clockwise until the magnetic end contacts the airflow sensor plate retaining bolt.
- Connect jumper harness VW 1501 between the potentiometer and the connector. Connect a voltmeter to terminals 2 and 3 of the harness. Switch the meter to the DC 20 volt range.
- Turn the ignition ON . Pull slide (2) of the adjusting device into the first detent (idle position). Adjust the potentiometer until 0.2-0.5 volts is displayed. Tighten the potentiometer adjusting screws.
- Pull slide (2) into the second detent (full throttle position). The meter should display 4-4.5 volts. Lock the screws with a sealing compound or paint.